The following solution assumes that in manifest file you always set android:debuggable=true while developing and android:debuggable=false for application release.

Now you can check this attribute’s value from your code by checking the ApplicationInfo.FLAG_DEBUGGABLE flag in the ApplicationInfo obtained from PackageManager.

The following code snippet could help:

PackageInfo packageInfo = ... // get package info for your context
int flags = packageInfo.applicationInfo.flags; 
if ((flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0) {
    // development mode
} else {
    // release mode
}