android四大组件之Service 注册广播接收者

广播的注册一共有两种，一种就是用清单文件注册，还有另外一种就是用代码注册，代码注册比较灵活，可以在需要的时候注册，不需要的时候解除注册

用服务注册广播首先要开启服务，

然后在服务oncreate方法里注册广播，在ondestory方法里解除注册就可以了

package com.example.zhuceBroadcast;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;public class MyActivity extends Activity {/*** Called when the activity is first created.*/private Intent intent;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);intent = new Intent(this,RegistService.class);findViewById(R.id.startservie).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {startService(intent);}});findViewById(R.id.stopservice).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {stopService(intent);}});}
}

package com.example.zhuceBroadcast;import android.app.Service;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;/*** Created by Administrator on 2015/11/17 0017.*/
public class RegistService extends Service {MyReceiver myReceiver;@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {//拿到广播接收者对象
myReceiver = new MyReceiver();//拿到intentfilterIntentFilter filter = new IntentFilter();//屏幕开启和关闭
        filter.addAction(Intent.ACTION_SCREEN_ON);filter.addAction(Intent.ACTION_SCREEN_OFF);//注册
        registerReceiver(myReceiver, filter);}@Overridepublic void onDestroy() {unregisterReceiver(myReceiver);}
}

package com.example.zhuceBroadcast;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;/*** Created by Administrator on 2015/11/17 0017.*/
public class MyReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if(Intent.ACTION_SCREEN_ON.equals(action)){Toast.makeText(context,"屏幕开启",Toast.LENGTH_LONG).show();}else if (Intent.ACTION_SCREEN_OFF.equals(action)){Toast.makeText(context,"屏幕关闭",Toast.LENGTH_LONG).show();}}
}