使用内置的Camera 应用程序捕获图像
探索Android 所提供的内置功能，内置的图像捕获与存储功能为Android 上所有媒体功能提供了一个很好的切入点，为我们在以后的章节中处理音频和视频奠定了基础。
现在介绍如何利用内置的Camera（摄像头）应用程序。
package com.example;
import java.io.File;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends Activity {
final static int CAMERA_RESULT = 0;
ImageView imv;
Button but;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
findViewById();
but.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
/*执行Camera内置摄像头意图*/
Intent i = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(i, CAMERA_RESULT);
}
});
}
private void findViewById() {
but = (Button) findViewById(R.id.but);
imv = (ImageView) findViewById(R.id.img);
}
/* 当activity执行完后，就显示照片*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
Bundle bundle = data.getExtras();
Bitmap bmp = (Bitmap) bundle.get("data");
imv.setImageBitmap(bmp);
}
}
}
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.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>
<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" >
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerInParent="true"
/>
<Button
android:id="@+id/but"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/img"
android:layout_centerInParent="true"
android:text="take_a_picture"/>
</RelativeLayout>