back, Android will recreate the activity and the onCreate method is called again ... , this method is invoked by Android Activity Manager when the activity is first created. Here ... is a typical example of onCreate method in an activity class @Override public void onCreate ... an inherited method, this post will introduces the onCreate method. As the name indicated

tool. The signed and unsigned APK are exactly the same except the signed APK has some extra ... -INF. Different contents in META-INF in signed and unsigned APK: As you can see ... , there are three extra files in signed APK: MANIFEST.MF, CERT.SF, CERT.RSA. The unsigned APK ... By default when you build your Android project, there will be some variants of APK generated