Android实现后台长期监听时间变化

1.首先我们的目的是长期监听时间变化,事实上应用程序退出。

通过了解我们知道注冊ACTION_TIME_TICK广播接收器能够监听系统事件改变,可是

查看SDK发现ACTION_TIME_TICK广播事件仅仅能动态注冊:

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().

所以要想实现长期监听时间变化。就须要借助后台服务的帮助了

2.解决方法(3步骤):

(1)在某个时间启动后台服务

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);

//启动后台服务
Intent service=new Intent(this, TimeService.class);
startService(service);

}

}

(2)在服务组件中动态注冊广播事件

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", "后台进程被创建。

。。

");

//服务启动广播接收器,使得广播接收器能够在程序退出后在后天继续运行。接收系统时间变更广播事件
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", "后台进程。。

。");
return super.onStartCommand(intent, flags, startId);

}

@Override
public void onDestroy() {

Log.i("liujun", "后台进程被销毁了。。。

");
super.onDestroy();
}

}

(3)在广播接收器组件中操作

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", "时间发生变化。。。

");

}


}


//至此长期实现后台监听时间变化Demo就完毕了。

。。





原文地址:https://www.cnblogs.com/mengfanrong/p/5245810.html