Adjust the layout to fit more devices

1. Adjust the layout
2. Link enter with "Sign in" Button in password input of the main activity

Fix typo in database

1. Boby -> Bobby, Samy -> Sammy
2. Change their corresponding password
3. Modify the format of phone number

A SQL injection demo on mobile app with safe countermeasures

Based on the previous version I developed a few days ago

1. Add a safe mode as

query = "SELECT * FROM "+ TABLE_NAME + " WHERE NAME=? AND PASSWORD=?";
cursor = db.rawQuery(query, new String[]{username,password});

Instead of direct joining variables.

2. Add a rest button to reset the polluted SQLite database as the initial table.
3. Admin now can insert or delete employees in the database. I add this functionality for more flexible test and demo on custom data.
4. Detailed instructions to explore this app can be found in this manual

base version

Basic release