I'm trying to build an Android app which will repeatedly run some process every 10 mins.
As I found out Handlers
are more reliable than timers or scheduling. So I'm going to develop my app using the Handlers
using the given below codes.
I'm little bit concerned that the below codes will create separate Handlers
at each time I start the app and keep them running parallel, may be since I'm creating the Handler
on onCreate
.
So what is the best way to keep only a single Handler
runs in background at a time?
private Handler handler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
handler = new Handler(); // new handler
handler.postDelayed(runnable, 1000*60*10); // 10 mins int.
setContentView(R.layout.activity_pro__sms);
}
private Runnable runnable = new Runnable() {
@Override
public void run() {
/* my set of codes for repeated work */
foobar();
handler.postDelayed(this, 1000*60*10); // reschedule the handler
}
};
Handler is better than TimerTask . The Java TimerTask and the Android Handler both allow you to schedule delayed and repeated tasks on background threads. However, the literature overwhelmingly recommends using Handler over TimerTask in Android (see here, here, here, here, here, and here).
A Handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue . Each Handler instance is associated with a single thread and that thread's message queue. When you create a new Handler it is bound to a Looper .
You can extend Application class and do your work in it.
public class App extends Application {
private Handler handler;
@Override
protected void onCreate() {
super.onCreate();
handler = new Handler(); // new handler
handler.postDelayed(runnable, 1000*60*10); // 10 mins int.
setContentView(R.layout.activity_pro__sms);
}
private Runnable runnable = new Runnable() {
@Override
public void run() {
/* my set of codes for repeated work */
foobar();
handler.postDelayed(this, 1000*60*10); // reschedule the handler
}
};
}
And declare your class in manifest:
<application android:name=".App">
Edited
But it will work only if your app is running, otherwise you can use AlarmManager
.
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