Android-使用服務注冊廣播接收者

配置檔案：

<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) {
        //啟動服務
        startService(intent);
    }

    public void stop(View view) {
        //停止服務
        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.建立廣播接收者對象
        screenReceiver = new ScreenReceiver();
        //2.建立intent-filter對象
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);

        //3.注冊廣播接收者
        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("螢幕打開");
        }
        if (Intent.ACTION_SCREEN_OFF.equals(action)){
            System.out.println("螢幕關閉");
        }
    }
}