How you can change keyboard colors in Prime Android Emu

[FrankP]

for those of you, having also problems with the orange letter colors on the Prime Android App:

By accident I came across the free Android 'APK Editor' App. After installation:

1. select 'APK from App' or 'File' and choose your HP Prime APK.
2. Select 'Simple Edit',
3. change in group 'Files' to 'res' subdir 'drawable-nodpi-v4'.
4. Select the edit button near to eg. 'portrait_skin.png'.
5. Select the file you want to replace the original file with. Same dimension and size required.
6. Press 'Save'.
   

After several minutes, the modified APK is saved to your Phone and is waiting to replace the standard HP Prime installation.
For editing the PNG on the Android, I used the also free 'Photo Editor 5.1'. My PNG files
  portrait_bg_and_skin.zip (Size: 943.21 KB / Downloads: 6) for the following result
    with Emu 2.1.14294 (2019 10 25) on Android 7.1.