Android监听耳机事件

package com.example.wang.audiopolicyservice;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.AudioManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private AudioManager mAudioManager;
private NoisyAudioStreamReceiver myReceiver;
final String TAG = "wangrl";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
myReceiver = new NoisyAudioStreamReceiver();
IntentFilter intentFilter = new  IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
registerReceiver(myReceiver,intentFilter);
}
private class NoisyAudioStreamReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (AudioManager.ACTION_AUDIO_BECOMING_NOISY.equals(intent.getAction())) {
// Pause the playback
Toast.makeText(MainActivity.this, "Headset is pluged out", Toast.LENGTH_SHORT).show();
}
}
}

@Override
protected void onStop() {
unregisterReceiver(myReceiver);
super.onStop();
}

@Override
protected void onDestroy() {
super.onDestroy();
}
}