Also keep line number but hide source file.

Quote: Some Chromebooks don't support touch. Although not essential, it's a good idea to explicitly include this declaration.

Refine parents of theme to allow override at API level.
Detail information for colors in "base" theme ("Blue Gray 50" palette).

This allows widget attributes to be changed with change of theme.

Remark: unlike Android Studio command line builds are not affected!

Switch allows use of more recent versions of "Gradle" and "Android Gradle plugin" in Android Studio.
For instance in Android Studio 3.2.1 build fail with error:
(*) case gradle 4.10.2 and gradle plugin 3.3.+:
...
Unsupported method: NativeArtifact.getSourceFolders().
The version of Gradle you connect to does not support that method.
...

(*) case gradle 5.+:
...
Failed to notify build listener.
...

Please revert this patch if you would like to use version of Android Studio before 3.3+.

Assets "etc" and "xbin" has items otherwise application will not work at all.

Synchronization of project files with gradle 5.0 fail with message "Failed to notify build listener".

This avoids restriction for implicit broadcasts on Android 8.0 (Oreo, API level 26) or newer.