Android app fix two issues

The project is related to fix 3 easy issues, find the cause for the first issue, then find out where the second error is. To do this, you have to familiarize yourself a little with the Java code in `MainActivity.java`. The code is kept very simple and the important parts are commented on. Extend the app so that you can also pass the hint text from the HTML file and thus customize it. The native scanner offers a corresponding config property "FinderTextHint". I will provide files with the winner. Easy fix, so quick.