Android--后台长期执行定时循环任务
版权声明：本文为博主原创文章，转载请标明出处。 https://blog.csdn.net/chaoyu168/article/details/79607270
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.SystemClock;
import java.util.Timer;
import java.util.TimerTask;
public class MyService extends Service {
private Runnable runnable;
private Handler handler;
private int Time = 1000*3;//周期时间
private int anHour =8*60*60*1000;// 这是8小时的毫秒数 为了少消耗流量和电量，8小时自动更新一次
private Timer timer = new Timer();
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
super.onCreate();
/**
* 方式一：采用Handler的postDelayed(Runnable, long)方法
*/
handler = new Handler();
runnable = new Runnable() {
@Override
public void run() {
// handler自带方法实现定时器
System.out.println("33331");
handler.postDelayed(this, 1000*3);//每隔3s执行
}
};
handler.postDelayed(runnable, 1000*60);//延时多长时间启动定时器
/**
* 方式二：采用timer及TimerTask结合的方法
*/
TimerTask timerTask = new TimerTask() {
@Override
public void run() {
System.out.println("99999998");
}
};
timer.schedule(timerTask,
1000,//延迟1秒执行
Time);//周期时间
}
/**
* 方式三：采用AlarmManager机制
*/
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
new Thread(new Runnable() {
@Override
public void run() {
System.out.println("99999988");//这是定时所执行的任务
}
}).start();
AlarmManager manager = (AlarmManager) getSystemService(ALARM_SERVICE);
long triggerAtTime = SystemClock.elapsedRealtime() + anHour;
Intent intent2 = new Intent(this, AutoUpdateReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(this, 0, intent2, 0);
manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pi);
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
super.onDestroy();
}
}
public class AutoUpdateReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Intent i = new Intent(context, MyService.class);
context.startService(i);
}
}
