Android development RecoverySystem.installPackage() cannot write to /cache/recovery/command permission denied

Question

I have been asked to write a small simple app for an Android-based product. The device comes with two Android system images with different features. The app I\'m writing is

Answer 1

I have problem the same with you when create custom OtaUpdate app in android 5.0.2 and i have resolved it. I will share with you with 2 steps below:

1. Add android:sharedUserId="com.google.uid.shared" in AndroidManifest.xml
2. Push your apk to system/app or system/priv-app

For android 4.1.2 :

1. Add android:sharedUserId="android.uid.system" in AndroidManifest.xml
2. Push your apk to system/app