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;

    @Override
    protected 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);
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        unregisterReceiver(headsetPlugReceiver);  //注销监听
    }


    class HeadsetPlugReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub

            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();
                }
            }
        }

    }
}