Android -- 检测耳机插入状态

原理                                                                                   

其实android系统在耳机插入和拔出的时候都会发送广播，所以我们要想检测耳机的状态只需要注册响应的BroadCastReceiver，对状态进行响应的判断就ok了。

这个广播的名字叫做：android.intent.action.HEADSET_PLUG

Code                                                                                   

package com.yydcdut.ear;

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //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();
                }
            }
        }
    }
}

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