Installing APK files on Android using ADB (and direct transfer)

How to install Android APK package files to a device or emulator using ADB.exe. The Android SDK is now part of Android Studio and available: ...or directly copying files across. Included both methods. It&probably best to learn the ADB/command line process since ADB is such a useful tool. Assuming you don&want any complicated paths or automation set up, it should be something you can jot down on a bit of paper for future reference.