Singed apk gives ClassNotFoundException in android

Question

I am generating singed apk using eclipse Export Signed Application Package. After generating signed apk i have installed that into my device at that time I got

Answer 1

Ensure you have this on your proguard file -keep public class * extends android.app.Application like this:

 -keep public class * extends android.app.Activity
 -keep public class * extends android.app.Application
 -keep public class * extends android.app.Service
 -keep public class * extends android.content.BroadcastReceiver
 -keep public class * extends android.content.ContentProvider
 -keep public class * extends android.app.backup.BackupAgentHelper
 -keep public class * extends android.preference.Preference
 -keep public class * extends android.support.v4.app.Fragment
 -keep public class * extends android.widget.BaseAdapter
 -keep class com.android.vending.billing.**

and make sure your proguard file is really being used.

Answer 2

I had the same problem after disabling minifyEnabled true fixed the problem. if the problem only exist on signed apk. check buildtypes release on module.gradle

 buildTypes {
    release {
     // minifyEnabled true

    }
}