1. Set APP_ABI:=all in almost all samples
2. Enhance hello-jni to report more ABIs
3. Fix warnings
Change-Id: I2851c42b77ef8225e32143d225edcf973633e782
1. hello-gl2 from android-5 to android-7
2. native-activity from android-9 to android-10
3. native-audio from android-9 to android-10
4. native-plasma from android-9 to android-10
Related CL
https://android-review.googlesource.com/#/c/42218, which
adjusts android-10 to use android-9 header/lib
Related issue:
http://code.google.com/p/android/issues/detail?id=20017
Change-Id: I49c4c0dd2cedb34522a9d196211ee96fce21b6c4
Remove all duplicate platform files, i.e development/ndk/platforms/android-N now
only contains files that are introduced in API level 'N' and not found in level 'N-1'
(This makes it easier to manage independent platform release branches, and makes
platform additions trivial to examine and maintain).
Move samples that depends on features of API level 'N' into platforms/android-N/samples
+ update tests/run-all.sh accordingly
Change-Id: I04c4c67c6c674c1714d5812d461d0524a4f4cfd9
