Android实现检测耳机插入和拔出

在Android下实现检测耳机插入和拔出，也即建立一个Broadcast Receiver，监听“android.intent.action.HEADSET_PLUG”广播

但直接在AndroidManifest.xml中添加一个标签是无效的，如：

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

你会发现Receiver的onReceive事件永远不会被触发，解决方法就是手动编写代码注册该广播。

首先，创建一个BroadcastReceiver的子类，用于监听耳机插入和拔出：

public class HeadsetPlugReceiver extends BroadcastReceiver {

    private static final String TAG = "HeadsetPlugReceiver";

    @Override
    public void onReceive(Context context, Intent intent) {
          if (intent.ha***tra("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();
               }
          }

    }

}

然后，在需要监听该事件的Activity中的onCreate()中注册监听该广播，同时不要忘记在onDestroy()中注销监听该广播：

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();
    }
}

如上这样就可以实现检测耳机插入和拔出了。

http://blog.csdn.net/sunmanzth/article/details/6950034