Two instances of my android application are running…How to avoid this?

Question

Here is my problem -

1. I copied my .apk file onto phone memory card and launch my application clicking on it and it allows me to install my application.I ins

Answer 1

I believe you need to put

<activity
    android:launchMode="singleInstance"
</activity>

in the manifest file.

Answer 2

what do your OnPause, OnResume and OnCreate? I will bet money you are not saving anything OnPause, and starting a new instance all the time via OnCreate.

You should read the notes on Activity Lifecycles.

Answer 3

// put below code in your launcher activity before call super and setcontentview()

ActivityManager am = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);

    // get the info from the currently running task
    List< ActivityManager.RunningTaskInfo > taskInfo = am.getRunningTasks(10);
    boolean alreadyTask=false;
    for(ActivityManager.RunningTaskInfo info : taskInfo){
        ComponentName componentInfo = info.topActivity;
        String value= componentInfo.getPackageName();
        if(value.contains(getPackageName()) && !info.topActivity.getClassName().contains(getPackageName()+".LauncherActivity")){
            alreadyTask=true;
            Log.i(TAG, "second instance found!!!");
            break;
        }
    }

    if(alreadyTask){
        finish();
    }

Answer 4

If you haven't got this sorted yet, I would say your app is actually being killed when home is pressed, or perhaps you have a bug that doesn't latch onto whatever object is keeping state.

Answer 5

I don't have a solution but the problem is that the intent used to start the app is different when you open it directly from install compared to opening it from your home screen. Since it will get started by two different intents it will open a new instance the second time round.

A quick work around is to avoid pressing "Open" when you have installed the application. Press "Done" and then find the application yourself.

See: http://code.google.com/p/android/issues/detail?id=2373

Answer 6

@Palejandro, here you are. Put the code below into your main activity onCreate() method:

// Possible work around for market launches. See
// http://code.google.com/p/android/issues/detail?id=2373
// for more details. Essentially, the market launches the main activity
// on top of other activities.
// We never want this to happen. Instead, we check if we are the root
// and if not, we finish.
if (!isTaskRoot()) {
    final Intent intent = getIntent();
    final String intentAction = intent.getAction();
    if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && intentAction != null && intentAction.equals(Intent.ACTION_MAIN)) {
        Log.w(TAG, "Main Activity is not the root. Finishing Main Activity instead of launching.");
        finish();
        return;
    }
}

I used this piece of code in my projects and it works fine!