This app stopped working on 4.1 because Google has changed the access control. The last method to fix it is manually granting the access in developer mode.
You can try it if you can understand the steps below:
1. On your phone go to settings->developer options->toggle on USB debugging. If you cannot even find the developer options in settings menu, you should go to settings->about phone->scroll to the last item "build number" and click on it for more than 10 times and then the hidden item of developer options will be shown.
2. Install the driver of your Android phone, and go to http://dl.google.com/android/android-sdk_r22.2.1-windows.zip to download the Android SDK tools, and extract it on your PC
3. Connect your phone with your PC with USB cable, you might see a dialog asking for confirmation to enable debugging this phone with the PC, select YES
4. On your PC, open a terminal command line shell, like cmd or powershell, execute "adb devices" you can see the connected device listed there.
5. If all of above are OK, just execute the command line below:
adb shell "pm grant com.robin.huangwei.vibrate250 android.permission.READ_LOGS"
Thanks for Danil Safonov who has post his experience when making this app work on Nexus5. He has posted the whole procedure with screen shots, please refer to the following link: http://forum.xda-developers.com/showpost.php?p=51657976&postcount=12
We all know that cell phone radiation is very strong when ringing, Vibrate Call makes your phone vibrate when an out-going call is answered or hung up, so you don't need to listen to it before the call get answered. Less radiation, more healthy. And you can set how long it vibrates. This application is tiny, saving your resource and battery!
We promise that this application will never steal your personal information. The network access is only for the advertisment. You can buy an AD-FREE version of this software(Vibrate Call Pro), which does not access to the Internet, more safety, more battery-saving!
1.03 - fix bug for LGE
1.04 - fix bug so it can vibrate when hangup by callee
1.05 - fix component disabled by other application issue