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

// 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();
    }