android实现耳机插入和拔出状态检测

在Android下实现检测耳机插入和拔出，需要建立一个BroadcastReceiver，用来监听"android.intent.action.HEADSET_PLUG"广播。

实现步骤：

1.创建一个BroadcastReceiver的子类，并重写onReceive()方法，在该方法中编写接收到广播后的处理逻辑；

2.创建一个Activity类，在onCreate()方法中使用registerReceiver()方法进行注册监听广播；

3.在Activity中重写onDestory()方法，使用unregisterReceiver()注销监听广播。

具体实现代码如下：

广播接收器类

package com.leigo.demo.receiver;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;/** * Created by Administrator on 2014/8/27. */public class HeadsetDetectReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        if (Intent.ACTION_HEADSET_PLUG.equals(action)) {            if (intent.hasExtra("state")) {                int state = intent.getIntExtra("state", 0);                if (state == 1) {                    Toast.makeText(context, "插入耳机", Toast.LENGTH_SHORT).show();                } else if(state == 0){                    Toast.makeText(context, "拔出耳机", Toast.LENGTH_SHORT).show();                }            }        }    }}

package com.leigo.demo;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import com.leigo.demo.receiver.HeadsetDetectReceiver;public class MainActivity extends Activity {    private BroadcastReceiver receiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        /**         *  Broadcast Action: Wired Headset plugged in or unplugged         *  The intent will have the following extra values:         *  state - 0 for unplugged, 1 for plugged.         *  name - Headset type, human readable string         *  microphone - 1 if headset has a microphone, 0 otherwise         */        receiver = new HeadsetDetectReceiver();        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction(Intent.ACTION_HEADSET_PLUG);        registerReceiver(receiver, intentFilter);    }    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(receiver);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

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