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How can I bring an activity to the front from a background service

Answer 1

+2 A:

Call getApplicationContext() in your Service which will give you a Context and then launch the target Activity as usual.

alex 2010-03-17 12:07:40

Or, better yet, don't call `getApplicationContext()` and just call `startActivity()` on the `Service`.

CommonsWare 2010-03-17 12:27:22

I have still this kind exception:"03-17 14:41:48.438: ERROR/AndroidRuntime(7895): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?"Despite my flag below:Code in the service:"Context ctx = this.getApplicationContext();startActivity(new Intent(ctx, MainActivity.class));Intent intent = new Intent(this, SplashScreenActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT|Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);"

Erwan Pinault 2010-03-17 13:48:51

Anyway if I call startactivity with or without the context from getApplicationContext or from the current service I have the same exception, so I put the flag "FLAG_ACTIVITY_NEW_TASK" but it recreate the activity and I don't want this behaviour.

Erwan Pinault 2010-03-17 13:49:54

In fact you have to use both getApplicationContext():Context ctx = this.getApplicationContext();Intent intent = new Intent(ctx, MainActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);and use in your manifest: android:launchMode="singleInstance" option to avoiding to create a new instance each time

Erwan Pinault 2010-03-17 14:00:54

You don't need to use singleInstance. In fact, please don't use it. Do you realize that it impacts how the semantics if that activity launches its own activities? Maybe that is what you want, but it is a 10 ton weight being applied to solve that problem. Typically you need no special launch mode -- note for example how you don't need to use any special launch mode for the main activity of your app, yet if the user launches your app again from home it brings the current stack forward instead of making a new instance. That is the normal behavior.

hackbod 2010-03-17 16:53:31

Answer 2

A:

This should really be a comment on Alex's answer but that is not possible for some reason.

You don't have to use getApplicationContext() at all as your Service is a Context.

Intent intent = new Intent(this, MainActivity.class);

alexanderblom 2010-03-17 14:58:41

thank you!!!!!!

Erwan Pinault 2010-03-17 16:46:00

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How can I bring an activity to the front from a background service

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