Android 监听耳机的插拔事件

一般采用的是动态监听的方式来实现的：

package com.renhui.ej;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;public class MainActivity extends AppCompatActivity {HeadsetPlugReceiver headsetPlugReceiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);registerHeadsetPlugReceiver();  // 注册监听
    }private void registerHeadsetPlugReceiver() {headsetPlugReceiver = new HeadsetPlugReceiver();IntentFilter filter = new IntentFilter();filter.addAction("android.intent.action.HEADSET_PLUG");registerReceiver(headsetPlugReceiver, filter);}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();unregisterReceiver(headsetPlugReceiver);  //注销监听
    }class HeadsetPlugReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubif (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();}}}}
}