Android Delays when starting Activity from another app

Question

I have 2 apps. App A and App B has only BActivity ( App B's Package is : com.ts.share). From App A , i'd like to start App B. In App A, i called

Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.ts.share");
            LaunchIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity( LaunchIntent );

It worked fine.

At B, If exit B, go to A, and call again. It took 0s to start App B.

But At B, press Home button, go to A, and call again. It took 3 s to start App B.

I want to App B start immediately.

I appreciate your help!

This can't be handled via java code. This Intent runs outside of the application. — Tushar Gogna, Jan 08 '15 at 04:51
Create a button in A App, put above code on button click listenner. Thanks — Son Nguyen Thanh, Jan 08 '15 at 04:53
This defect is a feature of Android OS. To prevent untrusted starting activity call. There is a bug report here [[https://code.google.com/p/android/issues/detail?id=4536]] — Son Nguyen Thanh, Jan 12 '15 at 02:32
Does this answer your question? [Starting an activity from a service after HOME button pressed without the 5 seconds delay](https://stackoverflow.com/questions/5600084/starting-an-activity-from-a-service-after-home-button-pressed-without-the-5-seco) — Sam, Feb 14 '20 at 19:38

score 0 · Answer 1 · answered Jan 09 '15 at 11:24

In your second scenario, B is already running when you start it from A. In this case, because you've specified Intent.FLAG_ACTIVIY_CLEAR_TOP, it will need to finish the existing Activities that are still active in B before it can instantiate a new Activity in B. It is possible that you have code in finish(), onPause(), onStop(), or onDestroy() of the Activity (or Activities) in B that is causing the 3 seccond delay.

score -1 · Answer 2 · answered Jan 08 '15 at 05:38

-1

try this..

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
    Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.ts.share");
    LaunchIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity( LaunchIntent );
    }
}, 0);

answered Jan 08 '15 at 05:38

M S Gadag

2,057
1
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15

Thanks, But Nothing Changed! Still delay. – Son Nguyen Thanh Jan 08 '15 at 06:07

score -1 · Answer 3 · answered Aug 27 '15 at 04:44

It may be possible that your main thread is doing much work. An alternative solution would also be to load the intent on a separate handler.

Handler handler = new Handler(Looper.getMainLooper());

handler.post(new Runnable() {
    @Override
    public void run() {
        Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.ts.share");
            LaunchIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity( LaunchIntent );
    }
});

Android Delays when starting Activity from another app

3 Answers3