主题：Intent.createChooser() 妙用

Intent.createChooser(ntent target, CharSequence title)

 

 

其实 大家对该功能第一影响就是ApiDemo 里面的 其只有区区几行代码  提取为：

Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("audio/*"); startActivity(Intent.createChooser(intent, "Select music")); 

 

 

执行之 会弹出一个对话框 效果为：

 

 

 

 

 

 

其实 对于这段代码 大家应该都能猜出什么意思  现自己模拟并理解之

 

 

 

[代码]

 

1. 定义TestActivity 用于根据传入Uri  播放目标

public class TestActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.setTitle("TestActivity"); Intent i = this.getIntent(); Uri u = i.getData(); try { playMusic(u); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void playMusic(Uri uri) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException{ MediaPlayer mp = new MediaPlayer(); mp.setDataSource(this, uri); mp.prepare(); mp.start(); } } 

 

2. 在AndroidManifest 注册TestActivity

<activity android:name=".TestActivity" android:label="TestActivity"> <intent-filter> <action android:name="android.intent.action.GET_CONTENT" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.OPENABLE" /> <data android:mimeType="audio/music1" /> </intent-filter> </activity> 

 

 

 

3. 使用TestActivity

public void sendChooser(){ Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setDataAndType(Uri.parse("file:///sdcard/DCIM/cc.mp3"), "audio/music1"); startActivity(Intent.createChooser(intent, "Select music1 app")); } 

 

 

4. emulator 运行截图：