Question

即使我的应用程序没有运行，我也需要在后台运行每1分钟启动一次服务

以下是代码的一部分： `

我使用计时器每1分钟处理一次电话

    final Handler handler = new Handler();

    Timer timer = new Timer();
    TimerTask hourlyTask = new TimerTask() {

        @Override
        public void run() {
                handler.post(new Runnable() {
                @SuppressWarnings("unchecked")
                public void run() {
                    try {

                        Intent intent = new Intent(ServiceMain.this, LocationMonitoringService.class);
                        startService(intent);


                        //   Toast.makeText(testServiceMain.this, "test", Toast.LENGTH_SHORT).show();


                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                    }
                }
            });


        }
    };


    timer.schedule(hourlyTask, 3, 1000 * 10);


}

` 谢谢

Answer 1

Android TimerTask示例
TimerTask表示任务将运行指定的时间，它只运行一次或重复创建新的Class new TimerTask。
TimerTask有两种方法。

--> 
1 .scheduledExecutionTime() // Repeat Task
2 .schedule() //Only once
Timer singleTask = new Timer();
Timer repeatTask = new Timer();

int singleTaskInterval = 3000; // 3 sec
int repeatInterval = 10000; // 10 sec

 // this task for specified time only once it will run
singleTask.schedule(new TimerTask() {
@Override
public void run() {
// Here do something
// This task will run 3 sec only once.
}
}, 1000);

  // this task for specified time it will run Repeat
repeatTask.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
// Here do something
// This task will run every 10 sec repeat
}
}, 0, repeatInterval);

When your activity went to destroy or stop . you should cancel this task
--> --> 
@Override
protected void onDestroy(){
super.onDestroy();
if(singleTask != null){
singleTask.cancel();
}
if(repeatTask != null){
repeatTask.cancel();
}
}
Activity Code
/**
*
* @author vijayakumar
*
*/
public class AndroidMADQAActivity extends Activity {
/** Called when the activity is first created. */
Timer singleTask = new Timer();
Timer repeatTask = new Timer();
int singleTaskInterval = 3000; // 3 sec
int repeatInterval = 10000; // 10 sec
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
singleTask.schedule(new TimerTask() {
@Override
public void run() {
// Here do something
// This task will run 3 sec only once.
}
}, 1000);
repeatTask.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
// Here do something
// This task will run every 10 sec repeat
}
}, 0, repeatInterval);
}
@Override
protected void onDestroy(){
super.onDestroy();
if(singleTask != null){
singleTask.cancel();
}
if(repeatTask != null){
repeatTask.cancel();
}
}
}

Answer 2

您需要使用Android的警报管理器，它将在您在警报管理器中设置的时间启动您的服务

请参阅此开发者指南

http://developer.android.com/training/scheduling/alarms.html

Answer 3

对于Timer来说，这样做

Timer timer = new Timer() ;
MyTimer myTask = new MyTimer (timer) ;
int firstSart = 1000 ; // it means after 1 second.
int period = 1000*60 ; //after which the task will repeat;(After 60 seconds)
timer.schedule(myTask, firstSart, period) ;//the time specified in millisecond

为计时器创建单独的类＆amp;把服务放在那里，或者你可以在通用代码的情况下通过构造函数 -

import java.util.Timer;
import java.util.TimerTask;
/* This is scheduler class which have scheduleing operation logic*/
public class MyTimer extends TimerTask {

    Timer timer ;
    int count = 0 ;

    public MyTimer () {

    }

    public MyTimer ( Timer timer ) {
        this.timer = timer ;
    }

    public void toDo() {
        Intent intent = new Intent(ServiceMain.this, LocationMonitoringService.class);
        startService(intent);
    }

    @Override
    public void run () {
        toDo () ;

        if (count > 10) {
            // this is the condition when you want to stop the task here i have not incriges the value of count
            //so it will run in infinite loop.
            timer.cancel () ;
        }
    }

}

Answer 4

在代码中使用

    Timer timer ;
    int count = 0 ;

 if (count > 10) {
            // Enter your code 
            //It will run N number of time
            timer.cancel () ;
        }

如何每1分钟在后台运行服务

4 个答案: