Sanjay:

I want to disappear my App Icon from launcher and app will automatically restart after some time I did code for hiding icon below:

 try {
       PackageManager p = context.getPackageManager();
        ComponentName componentName = new ComponentName("com.package.name", "com.class.name");
        p.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
    } catch (Exception e) {
        Log.d("ERROR@@", "" + e.toString());
    }

this is code for reopening my app after some time

public void initializingTimerTask() {
    timerTask = new TimerTask() {
        @Override
        public void run() {
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    if (mIsInForegroundMode == false) {
                        Intent LaunchIntent=getPackageManager().getLaunchIntentForPackage("com.package.name");
                        LaunchIntent.setFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(LaunchIntent);
                    } else {
                    }
                }
            });
        }
    };
}

The error:

 11-16 14:10:02.802 18503-18503/com.package.newproject E/AndroidRuntime: FATAL EXCEPTION: 
    main Process: com.package.newproject, PID: 18503 java.lang.NullPointerException 
    at com.mspatel.package.newproject.AutoOpenAppService$1$1.run(AutoOpenAppService.java:101) 
    at android.os.Handler.handleCallback(Handler.java:743) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:136) 
    at android.app.ActivityThread.main(ActivityThread.java:5212) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
    at dalvik.system.NativeStart.main(Native Method)

but when turn to restart application app going to crash please help me.