android检测用户是否插了耳机

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

<receiver android:name=".HeadsetPlugReceiver">  
<intent-filter>  
  <action android:name="android.intent.action.HEADSET_PLUG" android:enabled="true"></action>  
</intent-filter>  
</receiver>

public class HeadsetPlugReceiver extends BroadcastReceiver {  

    private static final String TAG = "HeadsetPlugReceiver";  

    @Override  
    public void onReceive(Context context,Intent intent) {  
      if (intent.hasExtra("state")){  
        if (intent.getIntExtra("state",0) == 0){
          Toast.makeText(context,"headset not connected",Toast.LENGTH_LONG).show();  
        }  
        else if (intent.getIntExtra("state",0) == 1){  
          Toast.makeText(context,"headset connected",Toast.LENGTH_LONG).show();  
        }  
      }  
    }  

}  

public class TestHeadSetPlugActivity extends Activity {  

  private HeadsetPlugReceiver headsetPlugReceiver;  
  /** Called when the activity is first created. */  
  @Override  
  public void onCreate(Bundle savedInstanceState) {  
      super.onCreate(savedInstanceState);  
      setContentView(R.layout.main);  

      /* register receiver */  
      registerHeadsetPlugReceiver();  
  }  

  private void registerHeadsetPlugReceiver() {  
    headsetPlugReceiver = new HeadsetPlugReceiver();
    IntentFilter intentFilter = new IntentFilter();  
    intentFilter.addAction("android.intent.action.HEADSET_PLUG");  
    registerReceiver(headsetPlugReceiver,intentFilter);  
  }  

  @Override  
  public void onDestroy() {  
    unregisterReceiver(headsetPlugReceiver);  
    super.onDestroy();  
  } 
}  

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