Android實現後台長期監聽時間變化

1.首先我們的目的是長期監聽時間變化，其實應用程序退出。

通過了解我們知道注冊ACTION_TIME_TICK廣播接收器可以監聽系統事件改變，但是

查看SDK發現ACTION_TIME_TICK廣播事件只能動態注冊：

Broadcast Action: The current time has changed. Sent every minute. You can not receive this through components declared in manifests, only by exlicitly registering for it with Context.registerReceiver().

所以要想實現長期監聽時間變化，就需要借助後台服務的幫助了

2.解決方法（3步驟）：

（1）在某個時間啟動後台服務

package com.example.broadcastreceiverofdatachange;

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

public class MainActivity extends Activity {

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

//啟動後台服務
Intent service=new Intent(this, TimeService.class);
startService(service);

}

}

（2）在服務組件中動態注冊廣播事件

package com.example.broadcastreceiverofdatachange;

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

public class TimeService extends Service {

@Override
public IBinder onBind(Intent intent) {

return null;
}

@Override
public void onCreate() {

super.onCreate();
Log.i("liujun", "後台進程被創建。。。");

//服務啟動廣播接收器，使得廣播接收器可以在程序退出後在後天繼續執行，接收系統時間變更廣播事件
DataChangeReceiver receiver=new DataChangeReceiver();
registerReceiver(receiver,new IntentFilter(Intent.ACTION_TIME_TICK));

}


@Override
public int onStartCommand(Intent intent, int flags, int startId) {

Log.i("liujun", "後台進程。。。");
return super.onStartCommand(intent, flags, startId);

}

@Override
public void onDestroy() {

Log.i("liujun", "後台進程被銷毀了。。。");
super.onDestroy();
}

}

（3）在廣播接收器組件中操作

package com.example.broadcastreceiverofdatachange;


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


public class DataChangeReceiver extends BroadcastReceiver {

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

Log.i("liujun", "時間發生變化。。。");

}


}

//至此長期實現後台監聽時間變化Demo就完成了。。。