场景:实现安装一个apk应用程序的过程。界面如下:
编写如下应用,应用结构如下:
<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" tools:context=".MainActivity" >
<EditText android:hint="请输入安装apk文件的路径" android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/et_path"/>
<Button android:onClick="click" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="安装"/>
</RelativeLayout> |
MainActivity的内容如下:
package com.itheima.apkinstaller;
import java.io.File;
import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.widget.EditText;
public class MainActivity extends Activity { private EditText et_path;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et_path = (EditText) findViewById(R.id.et_path); }
public void click(View view) { String path = et_path.getText().toString().trim(); // <intent-filter> // <action android:name="android.intent.action.VIEW" /> // <category android:name="android.intent.category.DEFAULT" /> // <data android:scheme="content" /> // <data android:scheme="file" /> // <data android:mimeType="application/vnd.android.package-archive" /> // </intent-filter>
Intent intent = new Intent(); intent.setAction("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.setDataAndType(Uri.fromFile(new File(path)), "application/vnd.android.package-archive"); startActivity(intent); } } |
Android清单文件内容如下:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.itheima.apkinstaller" android:versionCode="1" android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="19" />
<application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.itheima.apkinstaller.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> |
1 场景:通过WebView加载一个页面,程序运行后的界面如下(注意:下面的页面是通过WebView通过load的方式加载进去的):
程序案例结构如下:
2 编写activity_main.xml布局:
<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" tools:context=".MainActivity" >
<!-- 嵌入的浏览器 --> <WebView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/wv"/>
</RelativeLayout> |
3 Android的清单文件:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.itheima.htmlui" android:versionCode="1" android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="19" /> <uses-permission android:name="android.permission.INTERNET"/>
<application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.itheima.htmlui.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> |
1 Android通知,界面效果:
点击”点击显示通知”,发现上方出现了一个红色小人的通知
点击”新版点击显示通知”,将通知滑动显示查看,效果如下:
程序案例结构如下:
2 编写布局文件:activity_main.xml
<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" tools:context=".MainActivity" >
<Button android:onClick="click" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="点击显示通知" /> <Button android:onClick="click2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:text="新版点击显示通知" />
</RelativeLayout> |
3 编写MainActivity,代码如下:
package com.itheima.notification;
import android.annotation.SuppressLint; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Intent; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.View;
public class MainActivity extends ActionBarActivity {
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }
public void click(View view){ NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); Notification notification = new "我是一个通知", System.currentTimeMillis()); notification.flags = Notification.FLAG_AUTO_CANCEL; Intent intent = new Intent(); intent.setAction(Intent.ACTION_CALL); intent.setData(Uri.parse("tel:10086")); //延期的意图 PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, 0); //设置点击事件的类型 notification. nm.notify(0, notification); }
/** * 新版本的notification * @param view */ @SuppressLint("NewApi") public void click2(View view){ Notification noti = new Notification.Builder(this) .setContentTitle("我是标题") //这些都是Android版本11版本开始的 .setContentText("我是内容") .setSmallIcon(R.drawable.notification) .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher)) .build(); NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); nm.notify(0, noti); } } |
Android清单文件:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.itheima.notification" android:versionCode="1" android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="19" /> <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="com.itheima.notification.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> |
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1 自杀代码:杀死进程的代码如下:
package com.itheima.exit;
import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.os.Bundle;
public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }
@Override public void onBackPressed() { AlertDialog.Builder builder = new Builder(this); builder.setTitle("提醒"); builder.setMessage("确定退出当前应用程序吗?"); builder.setPositiveButton("立刻退出", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) { finish();//关闭当前的activity //把自己的进程杀死 //自杀的方法 android.os.Process.killProcess(android.os.Process.myPid()); } }); builder.setNegativeButton("取消", null); builder.show(); } } |
程序退出先的效果(在Devices中的效果):
退出后:
1 杀死进程,场景:杀死空进程,后台进程,他杀(也就是说杀不死自己),界面效果:
程序案例代码结构如下:
2 编写activity_main.xml布局文件
<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" tools:context=".MainActivity" >
<EditText android:hint="请输入要杀死的进程包名" android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/et_packname"/>
<Button android:onClick="click" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="杀死进程"/> </RelativeLayout> |
3 MainActivity的代码如下:
package com.itheima.killother;
import android.app.Activity; import android.app.ActivityManager; import android.os.Bundle; import android.view.View; import android.widget.EditText;
public class MainActivity extends Activity { private ActivityManager am;//相当于进程管理器 private EditText et_packname;
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
//所有程序的开启都是由Activity的ActivityManager来管理的 am = (ActivityManager) getSystemService(ACTIVITY_SERVICE); et_packname = (EditText) findViewById(R.id.et_packname); }
public void click(View view) { String packname = et_packname.getText().toString().trim(); //注意要杀死别的进程需要加上权限 //<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/> //这里中方式只是杀死别人,注意:手机里面有些进程是杀死不掉的,比如电话进程 am.killBackgroundProcesses(packname); } } |
程序运行结果:
注意:如果有时候提示要重启adb,可以通过下面的方式:
下面以杀死上面的com.android.music为例:
点击”杀死进程”前:
点击”杀死进程”之后的效果: