Now however, this line had already been converted to something unreadable. The AndroidManifest.xml have a line looks like android:minSdkVersion='8', sdk version 8 means Android version 2.3, sdk version 23 means Android 6.0, search for 'android sdk versions' to get a full list.

You don't have to know what is xml but it was 'human readable' before being published and become unreadable when the app finally reached you.

One of the files is AndroidManifest.xml, that was originally a xml file before the author 'compile' and publish the app. To learn more about apk file's structure you can just google it. dalvik bytecode, pictures, text resources. Afterwards the app might be able to run on old devices, while it may also crash.Īn android app downloaded from Google Play or somewhere else is an apk file, which is actually just a zip compressed package, containing multiple files, e.g. For example, maybe an app CAN be run on android 4.4 but the author of the app set the minimum supported version to android 5.0. Sometimes an app has the ability to run on an old device, but there is also something in an app's apk file, indicating the oldest version that can install this app.

Download root apk for android 4.4.4