My road to clearing webug levels: Level 4 (intermediate level)

1. Level question

2. Open the question

3. After downloading it, you will know that this is an APK reverse question
It took a long time to download and use apktool for the first time

4. Building an Android development environment is another time-wasting process
Ignore this question for now,
The following steps only need to have the Android development environment, use the command apktool d test.apk to decompile and there will be a flag