Rarely, developers test backward compatibility or study early fragment implementations. Running an in an emulator provides historical insights into Android’s tablet evolution.
An APK is essentially a ZIP archive containing code, resources, and metadata. An APK built for Android 3.0 has specific characteristics that differentiate it from both earlier (Android 2.3 Gingerbread) and later (Android 4.0 Ice Cream Sandwich) versions. android 3.0 apk
Use a microSD card, USB cable (MTP), or ADB (Android Debug Bridge). ADB is most reliable: adb install your-app.apk USB cable (MTP)
For general text drafting on Android, you might consider these highly-rated apps available on Google Play or F-Droid : android 3.0 apk