Android 判断耳机是否插入

//给广播绑定响应的过滤器
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("android.intent.action.HEADSET_PLUG");
HeadsetReceiver headsetReceiver = new HeadsetReceiver();
registerReceiver(headsetReceiver, intentFilter);

//自己定义的广播接收器
public class HeadsetReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
if (intent.hasExtra("state")) {
if (0 == intent.getIntExtra("state", 0)) {
Toast.makeText(context, "耳机未插入", Toast.LENGTH_SHORT).show();
} else if (1 == intent.getIntExtra("state", 0)) {
Toast.makeText(context, "耳机已插入", Toast.LENGTH_SHORT).show();
}
}

}

}