You'll need a file manager app to move files into the correct folders. A popular, free option is ZArchiver, available on the Play Store.
Within the app, you can select and download as a playable version. Security Warning minecraft java alpha 1.0 16-02 download apk
Are you looking to install specific like b1.7.3 or Alpha mods? You'll need a file manager app to move
Understanding the technical differences between PC and mobile gaming helps explain why this specific file cannot safely or legitimately exist. free option is ZArchiver
This app acts as a safe wrapper that allows legitimate Java files to run on Android. Log into your official Microsoft account within the app.