java攻城狮之路(Android篇)--MP3 MP4、拍照、国际化、样式主题、图片移动和缩放

2022-08-16 14:10:00

一、MP3播放器

查看Android API文档可以看到MediaPlayer状态转换图：

练习：

package com.shellway.mp3player;

import java.io.File;

import java.io.IOException;

import android.support.v7.app.ActionBarActivity;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import android.content.Context;

import android.media.MediaPlayer;

import android.media.MediaPlayer.OnPreparedListener;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    //媒体播放器

    private MediaPlayer mp;

    private EditText songName;

    //之前是否暂停过

    private boolean pause;

    private File file;

    private TelephonyManager tm;

    //暂停保存点

    private int position = 0;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        songName = (EditText) findViewById(R.id.song_name);

        tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

        tm.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);

    }

    private class MyPhoneStateListener extends PhoneStateListener{

        @Override

        public void onCallStateChanged(int state, String incomingNumber) {

            // TODO Auto-generated method stub

            super.onCallStateChanged(state, incomingNumber);

            switch (state) {

            case TelephonyManager.CALL_STATE_IDLE://闲置状态

                if (position > 0 && mp != null) {

                    //跳转到指定的保存点位置

                    mp.seekTo(position);

                    mp.start();

                }

                break;

            case TelephonyManager.CALL_STATE_OFFHOOK://接听状态

                if(mp != null){

                    if(mp.isPlaying()){

                        position = mp.getCurrentPosition();

                        mp.pause();

                    }

                }

                break;

            case TelephonyManager.CALL_STATE_RINGING://响铃状态

                 if (mp.isPlaying()) {

                     position = mp.getCurrentPosition();

                     mp.pause();

                    }

                break;

            default:

                break;

            }

        }

    }

//这里是利用Activity生命周期的方法监听来电时暂停播放

//  @Override

//  protected void onResume() {

//      // TODO Auto-generated method stub

//      super.onResume();

//      if(position > 0){

//          //跳转到指定的位置

//          mp.seekTo(position);

//          mp.start();

//      }

//  }

//

//  @Override

//  protected void onPause() {

//      // TODO Auto-generated method stub

//      super.onPause();

//      position = mp.getCurrentPosition();

//      mp.pause();

//  }

    public void play(View view){

        String name = songName.getText().toString();

        file = new File(Environment.getExternalStorageDirectory(),name+".mp3");

            if (!file.exists()) {

                Toast.makeText(this, "文件不存在", Toast.LENGTH_SHORT).show();

                mp=null;

            }else{

                if (mp!=null) {

                    if (mp.isPlaying()) {

                        Toast.makeText(this, "歌曲已经在播放中", Toast.LENGTH_SHORT).show();

                    }else{

                        play();

                    }

                }else{

                    play();

                }

         }

    }

    public void play(){

        try {

            mp = new MediaPlayer();

            //置为初始状态

            mp.reset();

            //指定要播放的文件

            mp.setDataSource(file.getAbsolutePath());

            //准备(缓冲)

            mp.prepare();

            //设置缓冲完成监听

            mp.setOnPreparedListener(new MyOnPreparedListener());

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    private class MyOnPreparedListener implements OnPreparedListener{

        @Override

        public void onPrepared(MediaPlayer mp) {

            // TODO Auto-generated method stub

            //播放

            mp.start();

        }

    }

    public void pause(View view){

        if (mp.isPlaying()) {

            //暂停播放

            mp.pause();

            Button bt = (Button) view;

            bt.setText("继续");

            pause = true;

        }else{

            if (pause) {

                mp.start();

                Button bt = (Button) view;

                bt.setText("停止");

            }

        }

    }

    public void stop(View view){

        if (mp!=null) {

            //停止播放

            mp.stop();

        }

    }

    public void reset(View view){

        if (mp!=null) {

            mp.start();

        }

    }

    @Override

    protected void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();

        if (mp != null) {

            mp.release();

            mp = null;

        }

    }

}

MainActivity.java

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="请输入歌曲名" />

    <EditText

        android:id="@+id/song_name"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Complicated"

        />

  <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        >

    <Button

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:onClick="play"

        android:text="播放"

        />

    <Button

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:onClick="pause"

        android:text="暂停"

        />

    <Button

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:onClick="stop"

        android:text="停止"

        />

    <Button

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:onClick="reset"

        android:text="重播"

        />

  </LinearLayout>

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.mp3player"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <!-- 监听来电状态需要读取电话状态权限 -->

    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

二：MP4播放器

MP4的播放同MP3的差不多，主要是在显示视频的控件上的区别

package com.shellway.mp4player;

import java.io.File;

import java.io.IOException;

import android.support.v7.app.ActionBarActivity;

import android.media.MediaPlayer;

import android.media.MediaPlayer.OnCompletionListener;

import android.media.MediaPlayer.OnPreparedListener;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    private MediaPlayer mp;

    private EditText et_name;

    private File file;

    private boolean pause ;

    private SurfaceView surfaceview;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        et_name = (EditText) findViewById(R.id.et_name);

        surfaceview = (SurfaceView) findViewById(R.id.surfaceview);

        SurfaceHolder holder = surfaceview.getHolder();

        //给SurfaceView设置屏幕分辨率

        holder.setFixedSize(176, 144);

        //给SurfaceView设置保持高亮

        holder.setKeepScreenOn(true);

        //不让surfaceview维持自己的缓冲，让它得到的数据直接输出

        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    }

    public void play(View view){

        String name = et_name.getText().toString();

        file = new File(Environment.getExternalStorageDirectory(),name+".mp4");

        Log.i("i", file.getAbsolutePath());

        if (!file.exists()) {

            Toast.makeText(this, "播放文件不存在", Toast.LENGTH_SHORT).show();

        }else{

            //开始播放

            play();

        }

    }

    public void play(){

        try {

            mp = new MediaPlayer();

            mp.reset();

            mp.setDataSource(file.getAbsolutePath());

            //设置显示画面

            mp.setDisplay(surfaceview.getHolder());

            mp.prepare();

            mp.setOnPreparedListener(new MyOnPreparedListener());

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    private class MyOnPreparedListener implements OnPreparedListener{

        @Override

        public void onPrepared(MediaPlayer mp) {

            // TODO Auto-generated method stub

            mp.start();

        }

    }

    public void pause(View view){

        if (mp != null) {

            if (mp.isPlaying()) {

                mp.pause();

                pause = true;

            }else{

                mp.start();

                pause = false;

            }

        }

    }

    public void stop(View view){

        if (mp != null) {

            mp.stop();

        }

    }

    public void reset(View view){

        if (mp != null) {

            mp.reset();

            play();

        }

    }

    @Override

    protected void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();

        if (mp != null) {

            mp.release();

            mp = null;

        }

    }

}

MainActivity.java

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="请输入要播放的视频名称:" />

    <EditText

        android:id="@+id/et_name"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="test"

        />

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        >

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="play"

            android:src="@drawable/play"

            />

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="pause"

            android:src="@drawable/pause"

            />

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="stop"

            android:src="@drawable/stop"

            />

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="reset"

            android:src="@drawable/reset"

            />

    </LinearLayout>

    <SurfaceView

            android:id="@+id/surfaceview"

            android:layout_width="fill_parent"

            android:layout_height="240dp"

        ></SurfaceView>

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.mp4player"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

三、手机拍照

照相机的一些属性：
预览帧数：preview-frame-rate=30
图片质量：jpeg-thumbnail-quality=90
图片尺寸：preview-size-values=1280x720,800x480,768x432,720x480,640x480,480x320,176x144
SurfaceView只有当activity显示到了前台，该控件才会被创建。
只有当surfaceView被创建了，才把相机所捕获到的数据输出给它。
如果activity回到回台。surfaceview又会被销毁
注意：在拍照的时候相机是被占用的。拍照之后需要重新预览。

练习：

package com.shellway.takephoto;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.support.v7.app.ActionBarActivity;

import android.hardware.Camera;

import android.hardware.Camera.Parameters;

import android.hardware.Camera.PictureCallback;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.SurfaceHolder;

import android.view.SurfaceHolder.Callback;

import android.view.SurfaceView;

import android.view.View;

import android.view.Window;

import android.view.WindowManager;

public class MainActivity extends ActionBarActivity {

    private SurfaceView surfaceview;

    private Camera camera;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //请求窗体特征：设置不显示标题，注意要在setContentView之前设置

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.activity_main);

        //设置全屏幕显示

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

                             WindowManager.LayoutParams.FLAG_FULLSCREEN);

        surfaceview = (SurfaceView) findViewById(R.id.surfaceview);

        SurfaceHolder holder = surfaceview.getHolder();

        //设置屏幕分辨率

        holder.setFixedSize(176, 144);

        //设置屏幕保持高亮

        holder.setKeepScreenOn(true);

        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        holder.addCallback(new MySurfaceCallback());

    }

    private class MySurfaceCallback implements Callback{

        @Override

        public void surfaceCreated(SurfaceHolder holder) {

            // TODO Auto-generated method stub

            try {

                //打开相机

                camera = Camera.open();

                Parameters params = camera.getParameters();

                //设置照片的尺寸

                params.setPictureSize(800, 480);

                //设置预览帧数，为了兼容2.3以前版本还是加上好

                params.setPreviewFrameRate(5);

                //设置照片质量

                params.setJpegQuality(80);

                camera.setParameters(params);

                //设置预览显示

                camera.setPreviewDisplay(surfaceview.getHolder());

                //设置开始预览

                camera.startPreview();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

        }

        @Override

        public void surfaceChanged(SurfaceHolder holder, int format, int width,

                int height) {

            // TODO Auto-generated method stub

        }

        @Override

        public void surfaceDestroyed(SurfaceHolder holder) {

            // TODO Auto-generated method stub

            //释放相机资源

            if (camera != null) {

                camera.release();

                camera = null;

            }

        }

    }

    public void takephoto(View view){

        //参数：shutter 开门被按下, raw 相机所捕获的原始数据, jpeg 相机处理的数据

        camera.takePicture(null, null, new MyPictureCallback());

    }

    private class MyPictureCallback implements PictureCallback{

        @Override

        public void onPictureTaken(byte[] data, Camera camera) {

            // TODO Auto-generated method stub

            try {

                File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg");

                FileOutputStream fos = new FileOutputStream(file);

                fos.write(data);

                //记得拍照存完数据到存储卡后还要给相机设置继续预览

                camera.startPreview();

            } catch (Exception e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

        }

    }

    public void autofocus(View view){

        //这里是由相机硬件为我们自动对焦

    }

    @Override

    protected void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();

        if (camera != null) {

            camera.release();

            camera = null;

        }

    }

}

MainActivity.java

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.shellway.takephoto.MainActivity" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    <SurfaceView

        android:id="@+id/surfaceview"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        />

    <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_alignParentRight="true"

        >

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="autofocus"

            android:text="对焦"

            ></Button>

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:text="拍照"

            android:onClick="takephoto"

            ></Button>

    </LinearLayout>

</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.takephoto"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <!-- 获取相机的拍照权限 -->

    <uses-permission android:name="android.permission.CAMERA"/>

    <!-- 获取外存储设备的写权限 -->

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <!-- 设置横屏显示属性 screenOrientation-->

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" android:screenOrientation="landscape">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：下图是在真实手机上运行的截图

四、视频刻录

查看Android API文档可以看到MediaRecoder状态转换图，用它来实现视频的刻录：

package com.shellway.videorecoder;

import java.io.File;

import java.io.IOException;

import android.support.v7.app.ActionBarActivity;

import android.media.MediaRecorder;

import android.os.Bundle;

import android.os.Environment;

import android.view.Menu;

import android.view.MenuItem;

import android.view.Surface;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View;

import android.widget.Button;

public class MainActivity extends ActionBarActivity {

    //声明一个媒体刻录机

    private MediaRecorder mr;

    //因为是动态视图，可以用SurfaceView来展示

    private SurfaceView surfaceview;

    private Button bt_start;

    private Button bt_stop;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        surfaceview = (SurfaceView) findViewById(R.id.surfaceview);

        SurfaceHolder holder = surfaceview.getHolder();

        //设置屏幕分辨率

        holder.setFixedSize(176, 144);

        //设置屏幕保持高亮

        holder.setKeepScreenOn(true);

        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        bt_start = (Button) findViewById(R.id.bt_start);

        bt_stop = (Button) findViewById(R.id.bt_stop);

    }

    public void start(View view){

        try {

            //创建一个媒体刻录机

            mr = new MediaRecorder();

            //在给刻录机设置属性前首先要重置一下

            mr.reset();

            //设置音频、视频来源

            mr.setAudioSource(MediaRecorder.AudioSource.MIC);

            mr.setVideoSource(MediaRecorder.VideoSource.CAMERA);

            //设置音频、视频输出格式

            mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

            //设置音频、视频的编码

            mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

            mr.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

            //创建一个输出音频、视频的文件

            File file = new File(Environment.getExternalStorageDirectory(),

                                        System.currentTimeMillis()+".3gp");

            mr.setOutputFile(file.getAbsolutePath());

            //设置预览

            mr.setPreviewDisplay(surfaceview.getHolder().getSurface());

            //准备刻录

            mr.prepare();

            //开始刻录

            mr.start();

            //开始刻录后，按钮可见的转变

            bt_start.setEnabled(false);

            bt_stop.setEnabled(true);

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    public void stop(View view){

        //停止刻录

        mr.stop();

        //停止刻录后，按钮可见的转变

        bt_start.setEnabled(true);

        bt_stop.setEnabled(false);

        //释放资源

        mr.release();

        mr = null;

    }

}

MainActivity.java

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.shellway.videorecoder.MainActivity" >

    <SurfaceView

        android:id="@+id/surfaceview"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        />

    <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_alignParentRight="true"

        >

        <Button

            android:id="@+id/bt_start"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="start"

            android:text="开始"

            ></Button>

        <Button

            android:id="@+id/bt_stop"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginRight="10dp"

            android:onClick="stop"

            android:enabled="false"

            android:text="停止"

            ></Button>

    </LinearLayout>

</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.videorecoder"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <!-- 使用相机的权限 -->

    <uses-permission android:name="android.permission.CAMERA"/>

    <!-- 媒体刻录机的权限 -->

    <uses-permission android:name="android.permission.RECORD_AUDIO"/>

    <!-- 外存储写的权限 -->

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <!-- 设置一开始就横屏显示 -->

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" android:screenOrientation="landscape">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

五：手势识别
首先，使用系统给出的应用Gestures Builder画出手势库，然后把手势库导出到桌面，最后在工程res目录下
新建一个raw文件(这个文件表示原文件，编译的时候不会对它做任何修改)，我这里画的一个打勾和“Z”字母，
打勾表示拨打电话号码为5556的电话，“Z”字母表示退出本应用程序。

练习：

package com.shellway.gestures;

import java.util.ArrayList;

import android.support.v7.app.ActionBarActivity;

import android.R.anim;

import android.content.Intent;

import android.gesture.Gesture;

import android.gesture.GestureLibraries;

import android.gesture.GestureLibrary;

import android.gesture.GestureOverlayView;

import android.gesture.GestureOverlayView.OnGesturePerformedListener;

import android.gesture.Prediction;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    private GestureOverlayView gov;

    private GestureLibrary library;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        gov = (GestureOverlayView) findViewById(R.id.gov_id);

        //加载监听

        gov.addOnGesturePerformedListener(new MyOnGesturePerformedListener());

        //加载手势库

        library = GestureLibraries.fromRawResource(this, R.raw.gestures);

        library.load();

    }

    private class MyOnGesturePerformedListener implements OnGesturePerformedListener{

        @Override

        public void onGesturePerformed(GestureOverlayView overlay,

                Gesture gesture) {

            // 识别手势

            ArrayList<Prediction> predictions = library.recognize(gesture);

            if (predictions.isEmpty()) {

                Toast.makeText(getApplicationContext(),"手势不存在", Toast.LENGTH_SHORT).show();

            }else{

                //拿到手势库里面的第一个，即最匹配的手势

                Prediction prediction = predictions.get(0);

                //给匹配度打分，分是从0-10

                double score  = prediction.score;

                if (score>=6) {

                    //手势的名字

                    String name = prediction.name;

                    if (name.equals("call")) {

                        Intent intent  = new Intent();

                        intent.setAction(Intent.ACTION_CALL);

                        intent.setData(Uri.parse("tel:"+5556));

                        startActivity(intent);

                    }else if(name.equals("exit")){

                        //利用杀死进程的方法退出程序

                        android.os.Process.killProcess(android.os.Process.myPid());

                    }

                }else{

                    Toast.makeText(getApplicationContext(),"匹配度太低", Toast.LENGTH_SHORT).show();

                }

            }

        }

    }

}

MainActivity.java

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

       >

    <android.gesture.GestureOverlayView

                  android:id="@+id/gov_id"

                  android:layout_width="fill_parent"

                  android:layout_height="0dp"

                  android:layout_weight="1"

        ></android.gesture.GestureOverlayView>

    <LinearLayout

          android:layout_width="fill_parent"

          android:layout_height="wrap_content"

          android:orientation="horizontal"

        >

          <Button

              android:layout_width="0dp"

              android:layout_height="wrap_content"

              android:layout_weight="1"

              android:text="确定"

              />

          <Button

              android:layout_width="0dp"

              android:layout_height="wrap_content"

              android:layout_weight="1"

              android:text="取消"

              />

    </LinearLayout>

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.gestures"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <!-- 拨打电话权限 -->

    <uses-permission android:name="android.permission.CALL_PHONE"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

可以支持多笔手势：需要做如下改动

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

       >

    <!-- 要支持多笔手势就要加上gestureStrokeType这个属性，因为默认是单笔手势 -->

    <android.gesture.GestureOverlayView

                  android:id="@+id/gov_id"

                  android:layout_width="fill_parent"

                  android:layout_height="0dp"

                  android:layout_weight="1"

                  android:gestureStrokeType="multiple"

        ></android.gesture.GestureOverlayView>

    <LinearLayout

          android:layout_width="fill_parent"

          android:layout_height="wrap_content"

          android:orientation="horizontal"

        >

          <Button

              android:layout_width="0dp"

              android:layout_height="wrap_content"

              android:layout_weight="1"

              android:onClick="ok"

              android:text="确定"

              />

          <Button

              android:layout_width="0dp"

              android:layout_height="wrap_content"

              android:layout_weight="1"

              android:onClick="cancel"

              android:text="取消"

              />

    </LinearLayout>

</LinearLayout>

activity_main.xml

package com.shellway.gestures;

import java.util.ArrayList;

import android.support.v7.app.ActionBarActivity;

import android.R.anim;

import android.content.Intent;

import android.gesture.Gesture;

import android.gesture.GestureLibraries;

import android.gesture.GestureLibrary;

import android.gesture.GestureOverlayView;

import android.gesture.GestureOverlayView.OnGestureListener;

import android.gesture.GestureOverlayView.OnGesturePerformedListener;

import android.gesture.Prediction;

import android.net.Uri;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.MotionEvent;

import android.view.View;

import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    private GestureOverlayView gov;

    private GestureLibrary library;

    private Gesture gesture;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        gov = (GestureOverlayView) findViewById(R.id.gov_id);

        //加载监听

    //  gov.addOnGesturePerformedListener(new MyOnGesturePerformedListener());

        //这个是支持多笔手势的监听

        gov.addOnGestureListener(new MyOnGestureListener());

        //加载手势库

        library = GestureLibraries.fromRawResource(this, R.raw.gestures);

        library.load();

    }

    private class MyOnGestureListener implements OnGestureListener{

        @Override

        public void onGestureStarted(GestureOverlayView overlay,

                MotionEvent event) {

            // TODO Auto-generated method stub

            Log.i("i", " onGestureStarted ");

        }

        @Override

        public void onGesture(GestureOverlayView overlay, MotionEvent event) {

            // TODO Auto-generated method stub

            Log.i("i", " onGesture ");

        }

        @Override

        public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {

            // TODO Auto-generated method stub

            Log.i("i", " onGestureEnded ");

            //拿到当前的手势

            gesture = overlay.getGesture();

        }

        @Override

        public void onGestureCancelled(GestureOverlayView overlay,

                MotionEvent event) {

            // TODO Auto-generated method stub

            Log.i("i", " onGestureCancelled ");

        }

    }

    private class MyOnGesturePerformedListener implements OnGesturePerformedListener{

        @Override

        public void onGesturePerformed(GestureOverlayView overlay,

                Gesture gesture) {

            //overlay：表示当前的手势，gesture表示最后的手势

            recognize(gesture);

        }

    }

    public void ok(View view){

        recognize(gesture);

        gov.clear(true);

    }

    public void cancel(View view){

        gov.clear(true);

    }

    // 识别手势

    private void recognize(Gesture gesture) {

        ArrayList<Prediction> predictions = library.recognize(gesture);

        if (predictions.isEmpty()) {

            Toast.makeText(getApplicationContext(),"手势不存在", Toast.LENGTH_SHORT).show();

        }else{

            //拿到手势库里面的第一个，即最匹配的手势

            Prediction prediction = predictions.get(0);

            //给匹配度打分，分是从0-10

            double score  = prediction.score;

            if (score>=6) {

                //手势的名字

                String name = prediction.name;

                if (name.equals("call")) {

                    Intent intent  = new Intent();

                    intent.setAction(Intent.ACTION_CALL);

                    intent.setData(Uri.parse("tel:"+5556));

                    startActivity(intent);

                }else if(name.equals("exit")){

                    //利用杀死进程的方法退出程序

                    android.os.Process.killProcess(android.os.Process.myPid());

                }

            }else{

                Toast.makeText(getApplicationContext(),"匹配度太低", Toast.LENGTH_SHORT).show();

            }

        }

    }

}

MainActivity.java

多笔手势监听方法的测试：

八、通知：Notification
之前我们学了提示用户的两种方式：Toast 、AlertDialog
现在我们来看看通知Noitification,它主要由以下六部分组成：
图标、ticker提示信息、时间、标题、内容、事件

练习：

package com.shellway.notification;

import android.support.v7.app.ActionBarActivity;

import android.R.anim;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.RemoteViews;

public class MainActivity extends ActionBarActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    public void notification(View view){

        //得到通知管理器

        NotificationManager notificationManager =

                     (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        //构建通知

        Notification notification = new Notification(android.R.drawable.stat_notify_chat,

                                               "这是一个提示信息", System.currentTimeMillis());

        //通知的点击事件

        Intent intent = new Intent(this,MainActivity.class);

        //第二个参数为请求码，可随意指定。第四个参数为标志码，我们这里填0就可以了

        PendingIntent pendingIntent = PendingIntent.getActivity(this, 100, intent, 0);

        notification.setLatestEventInfo(this, "通知标题", "通知内容", pendingIntent);

        //点击后消失

        notification.flags = Notification.FLAG_AUTO_CANCEL;

        //发送通知

        notificationManager.notify(100, notification);

    }

    public void customnotification(View view){

        //得到通知管理器

        NotificationManager notificationManager =

                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        //构建通知

        Notification notification = new Notification();

        notification.icon = android.R.drawable.stat_notify_call_mute;//图标

        notification.tickerText  = "新的信息来啦";//通知提示信息

        //自定义通知内容布局

        RemoteViews remoteviews = new RemoteViews(getPackageName(), R.layout.contentview);

        notification.contentView = remoteviews;

        //定义通知内容

        Intent intent = new Intent(this,MainActivity.class);

        PendingIntent paIntent = PendingIntent.getActivity(this, 100, intent, 0);

        notification.contentIntent = paIntent;

        //点击后消失

        notification.flags = Notification.FLAG_AUTO_CANCEL;

        //发送通知

        notificationManager.notify(100, notification);

    }

}

MainActivity.java

package com.shellway.notification;

import android.app.Activity;

import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;

public class OtherActivity extends ActionBarActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.contentview);

    }

}

OtherActivity.java

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    >

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="notification"

        android:text="普通通知"

        />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="customnotification"

        android:text="自定义通知"

        />

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="horizontal" >

    <ImageView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/ic_launcher"

        />

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        >

        <TextView

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:text="新收到10条短信"

            />

        <ProgressBar

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            style="@android:style/Widget.ProgressBar.Horizontal"

            ></ProgressBar>

    </LinearLayout>

</LinearLayout>

contentview.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.notification"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".OtherActivity"></activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

九、动画(Animation)

我们可以查官方文档中API Guies可以看到

根据它，我们可以进行以上提到的两种动画的开发工作
练习1：tween动画,首先在res目录下新建文件夹anim，然后在其下面建立动画xml文件

package com.example.tweenanimation;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.widget.ImageView;

public class MainActivity extends ActionBarActivity {

    private ImageView iv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        iv = (ImageView) findViewById(R.id.iv);

    }

     public void start(View view){

         //加载动画

   //      Animation anim = AnimationUtils.loadAnimation(this, R.anim.alpha);//图片透明度

   //      Animation anim = AnimationUtils.loadAnimation(this, R.anim.scale);//图片缩放

   //      Animation anim = AnimationUtils.loadAnimation(this, R.anim.translate);//图片移动

   //      Animation anim = AnimationUtils.loadAnimation(this, R.anim.rotate);//图片旋转

         Animation anim = AnimationUtils.loadAnimation(this, R.anim.set);//以上综合

         //执行动画

         iv.startAnimation(anim);

     }

}

MainActivity.java

<?xml version="1.0" encoding="utf-8"?>

<!-- FillAfter,动画的最后一帧是否保持在View上面，FillEnabled是否启用Fill保持  -->

<alpha xmlns:android="http://schemas.android.com/apk/res/android"

    android:fromAlpha="1"

    android:toAlpha="0"

    android:duration="2000"

    android:fillAfter="true"

    >

</alpha>

alpha.xml

<?xml version="1.0" encoding="utf-8"?>

<!-- pivotX 若填5表示旋转5个像素， 若填5%表示相对自身旋转5%，若填5%p表示相对父元素旋转-->

<rotate xmlns:android="http://schemas.android.com/apk/res/android"

    android:fromDegrees="0"

    android:toDegrees="90"

    android:pivotX="50%"

    android:pivotY="50%"

    android:duration="2000"

    >

</rotate>

rotate.xml

<?xml version="1.0" encoding="utf-8"?>

<!-- FillAfter,动画的最后一帧是否保持在View上面，FillEnabled是否启用Fill保持 -->

<scale xmlns:android="http://schemas.android.com/apk/res/android"

    android:fromXScale="1"

    android:toXScale="2"

    android:fromYScale="1"

    android:toYScale="0.5"

    android:duration="2000"

    android:fillAfter="true"

    >

</scale>

scale.xml

<?xml version="1.0" encoding="utf-8"?>

<translate xmlns:android="http://schemas.android.com/apk/res/android"

    android:fromXDelta="0"

    android:toXDelta="100"

    android:fromYDelta="0"

    android:toYDelta="100"

    android:fillAfter="true"

    android:duration="2000"

    >

</translate>

translate.xml

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

    <alpha

    android:fromAlpha="1"

    android:toAlpha="0"

    android:duration="2000"

    android:fillAfter="true"

    />

    <scale

    android:fromXScale="1"

    android:toXScale="2"

    android:fromYScale="1"

    android:toYScale="0.5"

    android:duration="2000"

    android:fillAfter="true"

    />

    <translate

    android:fromXDelta="0"

    android:toXDelta="100"

    android:fromYDelta="0"

    android:toYDelta="100"

    android:fillAfter="true"

    android:duration="2000"

    />

    <rotate

    android:fromDegrees="0"

    android:toDegrees="90"

    android:pivotX="50%"

    android:pivotY="50%"

    android:duration="2000"

    />

</set>

set.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

     >

    <ImageView

        android:id="@+id/iv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/ic_launcher"

        />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="start"

        android:text="开始"

        />

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.tweenanimation"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

练习2：frame动画，首先在res目录下新建drawable文件夹，然后在其下加入要用到的图片资源和资源xml文件

package comshellway.frameanimation;

import android.support.v7.app.ActionBarActivity;

import android.graphics.drawable.AnimationDrawable;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.ImageView;

public class MainActivity extends ActionBarActivity {

    private AnimationDrawable ad;

    private ImageView iv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        iv = (ImageView) findViewById(R.id.iv);

    }

    //开始动画

    public void start(View view){

        //一般frame动画用来作背景用，在这里是得到背景动画

        ad = (AnimationDrawable) iv.getBackground();

        ad.start();

    }

    //停止动画

    public void stop(View view){

        ad.stop();

    }

}

MainActivity.java

<?xml version="1.0" encoding="utf-8"?>

<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="true" >

     <item

        android:drawable="@drawable/a1"

        android:duration="200" />

     <item

        android:drawable="@drawable/a2"

        android:duration="200" />

     <item

        android:drawable="@drawable/a3"

        android:duration="200" />

     <item

        android:drawable="@drawable/a4"

        android:duration="200" />

     <item

        android:drawable="@drawable/a5"

        android:duration="200" />

     <item

        android:drawable="@drawable/a6"

        android:duration="200" />

     <item

        android:drawable="@drawable/a7"

        android:duration="200" />

     <item

        android:drawable="@drawable/a8"

        android:duration="200" />

     <item

        android:drawable="@drawable/a9"

        android:duration="200" />

     <item

        android:drawable="@drawable/a10"

        android:duration="200" />

     <item

        android:drawable="@drawable/a11"

        android:duration="200" />

     <item

        android:drawable="@drawable/a12"

        android:duration="200" />

     <item

        android:drawable="@drawable/a13"

        android:duration="200" />

     <item

        android:drawable="@drawable/a14"

        android:duration="200" />

     <item

        android:drawable="@drawable/a15"

        android:duration="200" />

</animation-list>

res/drawable下的frame.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    >

  <ImageView

      android:id="@+id/iv"

      android:layout_width="fill_parent"

      android:layout_height="wrap_content"

      android:background="@drawable/frame"

      />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="start"

        android:text="开始"

        />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:onClick="stop"

        android:text="停止"

        />

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="comshellway.frameanimation"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

十、传感器

练习：

package com.shellway.sensor;

import android.support.v7.app.ActionBarActivity;

import android.content.Context;

import android.hardware.Sensor;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.animation.Animation;

import android.view.animation.RotateAnimation;

import android.widget.ImageView;

public class MainActivity extends ActionBarActivity {

    private MySensorEventListener listener;

    private SensorManager sensorManager;

    private Sensor sensor;

    private ImageView iv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        iv = (ImageView) findViewById(R.id.iv);

        //获得传感器管理器

        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

        //获得方向传感器

        sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);

        listener = new MySensorEventListener();

    }

    @Override

    protected void onResume() {

        // TODO Auto-generated method stub

        super.onResume();

        //注册sensor监听

        sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME);

    }

    private class MySensorEventListener implements SensorEventListener{

        private float predegree = 0;

        @Override

        public void onSensorChanged(SensorEvent event) {

            // TODO Auto-generated method stub

            float x = event.values[SensorManager.DATA_X];

            //创建一个旋转的动画，0.5f表示自身的正中间，Animation.RELATIVE_TO_SELF表示相对自身旋转

            RotateAnimation rotate = new RotateAnimation(-predegree, x,

                                      Animation.RELATIVE_TO_SELF, 0.5f,

                                      Animation.RELATIVE_TO_SELF, 0.5f);

            rotate.setDuration(50);

            iv.startAnimation(rotate);

            predegree = x;

        }

        //精确度的改变，这里暂时不用管

        public void onAccuracyChanged(Sensor sensor, int accuracy) {

            // TODO Auto-generated method stub

        }

    }

    @Override

    protected void onPause() {

        // TODO Auto-generated method stub

        super.onPause();

        //当应用在前台不活动的时候取消监听

        sensorManager.unregisterListener(listener);

    }

}

MainActivity.java

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.shellway.sensor.MainActivity" >

    <ImageView

        android:id="@+id/iv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerInParent="true"

        android:src="@drawable/zn"

        />

</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.sensor"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

十一：图片的移动和缩放

分析：

练习：

package com.shellway.dragscale;

import android.support.v7.app.ActionBarActivity;

import android.graphics.Matrix;

import android.graphics.PointF;

import android.os.Bundle;

import android.util.FloatMath;

import android.view.Menu;

import android.view.MenuItem;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.widget.ImageView;

public class MainActivity extends ActionBarActivity {

    private ImageView iv;

    private MyOnTouchListener listener;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        listener = new MyOnTouchListener();

        iv = (ImageView) findViewById(R.id.iv);

        iv.setOnTouchListener(listener);

    }

    private class MyOnTouchListener implements OnTouchListener{

        private PointF startPiont = new PointF();//起始点

        private Matrix mcurrentMatrix = new Matrix();//图片当前的matrix值

        private Matrix mMatrix = new Matrix();//来一个临时的matrix

        private int type = 0;

        private final static int DRAG = 1;

        private final static int SCALE = 2;

        private PointF mstartP;//中心点

        private float mdistance;//两点间的距离

        @Override

        public boolean onTouch(View v, MotionEvent event) {

            int action = event.getAction()&MotionEvent.ACTION_MASK;

            switch (action) {

            case MotionEvent.ACTION_DOWN://当手指按下

                float x = event.getX();

                float y = event.getY();

                startPiont.set(x, y);//

                mcurrentMatrix.set(iv.getImageMatrix());//图片还没有被拖动时候的位置

                type = DRAG;

                break;

            case MotionEvent.ACTION_POINTER_1_DOWN://屏幕上已经有一根手指，再按下一根手指

                mcurrentMatrix.set(iv.getImageMatrix());//图片还没有被缩放时候的大小

                mstartP = getMidPoint(event);//得到移动前两个手指间的中心位置

                mdistance = getMidDistance(event);//得到移动前两个手指间的距离

                type = SCALE;

                break;

            case MotionEvent.ACTION_MOVE://当手指移动

                if (type == DRAG) {

                    mMatrix.set(mcurrentMatrix);

                    float dx = event.getX() - startPiont.x;

                    float dy = event.getY() - startPiont.y;

                    mMatrix.postTranslate(dx, dy);

                }else if(type == SCALE){

                    mMatrix.set(mcurrentMatrix);

                    float distance = getMidDistance(event);//得到移动后两个手指间的距离

                    float sx = distance/mdistance;

                    mMatrix.postScale(sx, sx, mstartP.x, mstartP.y);

                }

                break;

            case MotionEvent.ACTION_UP://当手指弹起

            case MotionEvent.ACTION_POINTER_1_UP://屏幕上弹起一根手指，还有一根手指

                type = 0;

                break;

            default:

                break;

            }

            //给界面设置变动后的数据

            iv.setImageMatrix(mMatrix);

            return true;

        }

        //计算中心点位置

        public PointF getMidPoint(MotionEvent event){

            float x = (event.getX(1) + event.getX(0))/2;

            float y = (event.getY(1) + event.getY(0))/2;

            return new PointF(x,y);

        }

        //计算两点间的距离

        public float getMidDistance(MotionEvent event){

            float dx = event.getX(1) - event.getX(0);

            float dy = event.getY(1) - event.getY(0);

            return FloatMath.sqrt((dx*dx) + (dy*dy));

        }

    }

}

MainActivity.java

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.shellway.dragscale.MainActivity" >

    <!--scaleType表示缩放类型， matrix表示图片的位置和大小 -->

    <ImageView

        android:id="@+id/iv"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:scaleType="matrix"

        android:src="@drawable/family"

        />

</RelativeLayout>

activity_mian.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.shellway.dragscale"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

运行结果截图：

码农公寓

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