Question

I want minimize my app size as well as avoid the app from reverse-engineering. Can anybody help with simple answer?

Answer 1

Proguard is part of the android eclipse plugin, so you do not have to invoke it manually.
You just need to activate it on your build.

To enable ProGuard so that it runs as part of an Ant or Eclipse build, set the proguard.config property in the <project_root>/project.properties file. The path can be an absolute path or a path relative to the project’s root.

For some situations, the default configurations in the proguard.cfg file will suffice. However, many situations are hard for ProGuard to analyze correctly and it might remove code that it thinks is not used, but your application actually needs. Some examples include:

• a class that is referenced only in the AndroidManifest.xml file
• a method called from JNI
• dynamically referenced fields and methods

The default proguard.cfg file tries to cover general cases, but you might encounter exceptions such as ClassNotFoundException, which happens when ProGuard strips away an entire class that your application calls.

You can fix errors when ProGuard strips away your code by adding a -keep line in the proguard.cfg file.