android-检测耳机的插入和拔出动作

转载： http://blog.csdn.net/shaojie519/article/details/7341793

在android系统中，检测耳机的插入和拔出，也是通过广播实现的，可以建立一个Broadcast Receiver 监听"android.intent.action.HEADSET_PLUG" 这个Intent。

在这个Intent中包含以下几个值：

• state ---      0代表拔出，1代表插入
• name--- 字符串，代表headset的类型。
• microphone --   1代表这个headset有麦克风，0则没有。

在使用的时候发现直接在AndroidManifest,xml文件中静态注册是无效的

<receiver android:name=".HeadsetPlugReceiver">
        <intent-filter>
          <action android:name="android.intent.action.HEADSET_PLUG" android:enabled="true">           </action>
        </intent-filter>
  </receiver>

<receiver android:name=".HeadsetPlugReceiver">  
        <intent-filter>  
          <action android:name="android.intent.action.HEADSET_PLUG" android:enabled="true">           </action>  
        </intent-filter>  
  </receiver>  

解决办法是在代码中动态注册。

import android.app.Activity;
import android.content.IntentFilter;
import android.os.Bundle;

public class HeadSetActivity extends Activity {
    HeadsetPlugReceiver headsetPlugReceiver;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        registerHeadsetPlugReceiver();
    }
    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();  //注销监听
}
private void unregisterReceiver(){
    this.unregisterReceiver(headsetPlugReceiver);
}
}

import android.app.Activity;
import android.content.IntentFilter;
import android.os.Bundle;

public class HeadSetActivity extends Activity {
	HeadsetPlugReceiver headsetPlugReceiver; 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        registerHeadsetPlugReceiver();
    }
    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();  //注销监听
}
private void unregisterReceiver(){
	this.unregisterReceiver(headsetPlugReceiver);
}
}

在broadcast Receiver中监听事件：

<pre class="java" name="code">
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public 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();
                }
            }
    }

}
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