headset-监听有线耳机插拔

今天在做项目的时候，需要对耳机的插拔事件进行监听，所以就写了如下的一个小demo，对耳机监听事件进行验证。直接看代码

package com.example.alert;
  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
import android.util.Log;
import android.widget.Toast;  
  
public class HeadsetPlugReceiver extends BroadcastReceiver {  
  
    @Override  
    public void onReceive(Context context, Intent intent) {  
        // TODO Auto-generated method stub  
          
            int state = intent.getIntExtra("state", -1);
                int mic = intent.getIntExtra("microphone", -1);
                if(state==0 && mic ==0){ 
                    Log.e("123", "headset no microphone not connected");
                    Toast.makeText(context, "headset no microphone not connected", Toast.LENGTH_LONG).show();  
                } else if (state==0 && mic ==1) { 
                    Log.e("123", "headset with microphone not connected");
                    Toast.makeText(context, "headset with microphone not connected", Toast.LENGTH_LONG).show();
                }else if(state==1 && mic ==0){ 
                    Log.e("123", "headset no microphone connected");
                    Toast.makeText(context, "headset no microphone connected", Toast.LENGTH_LONG).show();  
                } else if (state==1 && mic ==1) {
                    Log.e("123", "headset with microphone connected");
                    Toast.makeText(context, "headset with microphone connected", Toast.LENGTH_LONG).show();  
                } 
            }  
     
  
} 

对于广播在activity中的注册什么的，我们就不写了，毕竟大家都知道

监听的广播是

filter.addAction("android.intent.action.HEADSET_PLUG");

直接看我们的打印log

1.进入应用->插入耳机->拔出耳机（带有麦克风）

  1 09-17 10:43:02.815: E/123(32136): headset no microphone not connected
  2 09-17 10:43:29.285: E/123(32136): headset no microphone connected
  3 09-17 10:43:29.355: E/123(32136): headset with microphone connected
  4 09-17 10:43:41.965: E/123(32136): headset with microphone not connected
  5 09-17 10:43:42.995: E/123(32136): headset no microphone not connected

2.插入耳机->进入应用->拔出耳机(带有麦克风)

  1 09-17 10:50:49.635: E/123(32136): headset with microphone connected
  2 09-17 10:51:01.995: E/123(32136): headset with microphone not connected
  3 09-17 10:51:03.025: E/123(32136): headset no microphone not connected

3.进入应用->插入耳机->拔出耳机（没有麦克风）

  1 09-17 11:10:34.665: E/123(3542): headset no microphone not connected
  2 09-17 11:10:38.985: E/123(3542): headset no microphone connected
  3 09-17 11:10:49.945: E/123(3542): headset with microphone connected
  4 09-17 11:10:50.635: E/123(3542): headset with microphone not connected
  5 09-17 11:10:51.635: E/123(3542): headset no microphone not connected

4.插入耳机->进入应用->拔出耳机(没有麦克风)

  1 09-17 11:03:27.815: E/123(2838): headset no microphone not connected
  2 09-17 11:03:30.865: E/123(2838): headset no microphone connected

从上面的结果我们可以得出如下的结论

1）监听有线耳机（有无麦克风）的广播 是 Intent.ACTION_HEADSET_PLUG

2）刚进入这个应用，会对耳机进行监听的，不明白为什么，但至少可以作为一次初始条件判断

3）这个广播可以同时监听插入的耳机是有线还是无线。不过，似乎是有线跟无线插入都会对有线跟无线进行判断，会发两次广播

4）state-耳机插入状态0-拔出 1-插入

     microphone-有无麦克风 0-没有 1-有