Android-使用服务注册广播接收者

<service
android:name=".RegisterService"
android:enabled="true"
android:exported="true" >
</service>

<receiver
android:name=".ScreenReceiver"
android:enabled="true"
android:exported="true" >
</receiver>

MainActivity.java

package com.example.yulongji.android5;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

private Intent intent;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intent = new Intent(this, RegisterService.class);
}

public void start(View view) {
//启动服务
startService(intent);
}

public void stop(View view) {
//停止服务
stopService(intent);
}

}

RegisterService.java

package com.example.yulongji.android5;

import android.app.Service;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;

public class RegisterService extends Service {

private ScreenReceiver screenReceiver;

@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onCreate() {
super.onCreate();
//1.创建广播接收者对象
screenReceiver = new ScreenReceiver();
//2.创建intent-filter对象
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);

//3.注册广播接收者
registerReceiver(screenReceiver, filter);
}

@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(screenReceiver);
}
}

ScreenReceiver.java

package com.example.yulongji.android5;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class ScreenReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

String action = intent.getAction();
if (Intent.ACTION_SCREEN_ON.equals(action)){
System.out.println("屏幕打开");
}
if (Intent.ACTION_SCREEN_OFF.equals(action)){
System.out.println("屏幕关闭");
}
}
}