Android 每分钟运行一次的服务
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Service that runs every minute
提问by AggieDev
I have a service that I am wanting to execute a task every minute in the background. It does not need to execute the task whenever the phone is asleep, only when the user is actively using it. I am trying to do this with an IntentService which is set up as follows:
我有一项服务，我想在后台每分钟执行一次任务。它不需要在手机休眠时执行任务，只有在用户积极使用它时才需要执行任务。我正在尝试使用设置如下的 IntentService 来做到这一点：
public class CounterService extends IntentService{
public CounterService() {
super("CounterService");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return super.onStartCommand(intent,flags,startId);
}
@Override
protected void onHandleIntent(Intent intent) {
Toast.makeText(this, "onhandleintent", Toast.LENGTH_SHORT).show();
while(true)
{
//one minute is 60*1000
try {
Thread.sleep(5 * 1000);
Toast.makeText(getApplicationContext(), "getting app count", Toast.LENGTH_LONG).show();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
Right now to get the functionality working I simply want it to display a toast every 5 seconds, I will change it to one minute later. If I have the while(true)commented out, then the "onhandleintent" message is displayed. However if I have the following code run, neither of the Toasts display. How can I fix this?
现在为了使功能正常工作，我只是希望它每 5 秒显示一次祝酒词，我会将其更改为一分钟后。如果我已while(true)注释掉，则会显示“onhandleintent”消息。但是，如果我运行以下代码，则 Toasts 都不会显示。我怎样才能解决这个问题？
回答by Android Newbie
This will send an intent to your service every minute without using any processor time in your activity in between
这将每分钟向您的服务发送一个意图，而不会在您的活动中使用任何处理器时间
Intent myIntent = new Intent(context, MyServiceReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 60); // first time
long frequency= 60 * 1000; // in ms
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), frequency, pendingIntent);
Adjust MyServiceReceiver.class to match your target service or activity. The documentationprovides more details to fine-tune your calls like whether you want exact timing, execution at a specific time of the day ...
调整 MyServiceReceiver.class 以匹配您的目标服务或活动。该文档提供了更多详细信息来微调您的调用，例如您是否需要准确的时间、在一天中的特定时间执行...
回答by jeremyvillalobos
You need to exit the main thread to avoid risking a ANR.
您需要退出主线程以避免 ANR 的风险。
Instead add a Handler
而是添加一个处理程序
Handler mHandler = new Handler();
...
@Override
protected void onHandleIntent(Intent intent) {
Toast.makeText(this, "onhandleintent", Toast.LENGTH_SHORT).show();
mHandler.postDelayed( ToastRunnable, 5000);
//while(true)
//{
//one minute is 60*1000
//try {
// Thread.sleep(5 * 1000);
// Toast.makeText(getApplicationContext(), "getting app count",
//Toast.LENGTH_LONG).show();
//} catch (InterruptedException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
//}
//}
}
final Runnable ToastRunnable = new Runnable(){
public void run(){
Toast.makeText(getApplicationContext(), "getting app count",
Toast.LENGTH_LONG).show();
mHandler.postDelayed( ToastRunnable, 5000);
}
}
回答by Prashant Yadav
Do it like this
像这样做
private void ping() {
try {
//Your code here or call a method
} catch (Exception e) {
Log.e("Error", "In onStartCommand");
e.printStackTrace();
}
scheduleNext();
}
private void scheduleNext() {
mHandler.postDelayed(new Runnable() {
public void run() { ping(); }
}, 60000);
}
public int onStartCommand(Intent intent, int x, int y) {
mHandler = new android.os.Handler();
ping();
return START_STICKY;
}
