I manage to build fine (although it failed with something about lint, but I ignored it using abortOnError false in gradle.build), and then I manage to install it to my phone too. But when I try to run the app, it crashes immediately with "Unfortunately MyApp has stopped working" error message.

Here's the logcat where I think the problem is, but this is beyond my comprehension. Any ideas?

E/AndroidRuntime(21353): FATAL EXCEPTION: GLThread 1338
E/AndroidRuntime(21353): Process: com.ktxsoftware.Empty, PID: 21353
E/AndroidRuntime(21353): java.lang.NullPointerException
E/AndroidRuntime(21353): 	at android.content.res.AssetManager.openAsset(Native Method)
E/AndroidRuntime(21353): 	at android.content.res.AssetManager.open(AssetManager.java:335)
E/AndroidRuntime(21353): 	at android.content.res.AssetManager.open(AssetManager.java:309)
E/AndroidRuntime(21353): 	at kha.android.Loader.loadBlob(Loader.java:145)
E/AndroidRuntime(21353): 	at kha.Loader.loadFiles(Loader.java:633)
E/AndroidRuntime(21353): 	at kha.Loader.loadProject(Loader.java:674)
E/AndroidRuntime(21353): 	at kha.Starter.start(Starter.java:449)
E/AndroidRuntime(21353): 	at haxe.root.Main.main(Main.java:35)
E/AndroidRuntime(21353): 	at kha.Starter.init(Starter.java:76)
E/AndroidRuntime(21353): 	at com.ktxsoftware.kha.KhaRenderer.onSurfaceCreated(KhaRenderer.java:58)
E/AndroidRuntime(21353): 	at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1503)
E/AndroidRuntime(21353): 	at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1242)

Just run across this problem. Kha has changed its kha.Loader to support for multi-file assets. But the android backend not changes accordingly. So a quick fix is to replace desc.file in kha.android.Loader to desc.files[0] will make it work.

@forafish Thanks for the info! I'll check it out when I have time. If I don't reply here again, then I probably fixed it thanks to your guide.

Nope, it didn't quite fix the issue. I replaced all of the "desc.file" to "desc.files[0]". Now, the game just crashes silently. I gave another look at logcat, and this is the error that I think is the problem:

E/AndroidRuntime(19089): FATAL EXCEPTION: GLThread 18188
E/AndroidRuntime(19089): Haxe Exception: Could not compile shader:
E/AndroidRuntime(19089): 0:4: P0007: Extension directive must occur before any non-preprocessor tokens
I/Process (19089): Sending signal. PID: 19089 SIG: 9
E/AndroidRuntime(19089): Error reporting crash
E/AndroidRuntime(19089): java.lang.NullPointerException
E/AndroidRuntime(19089): 	at java.lang.Throwable.getStackTrace(Throwable.java:201)
E/AndroidRuntime(19089): 	at android.app.ApplicationErrorReport$CrashInfo.<init>(ApplicationErrorReport.java:348)
E/AndroidRuntime(19089): 	at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:78)
E/AndroidRuntime(19089): 	at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
E/AndroidRuntime(19089): 	at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
D/KeyguardViewMediator( 2029): setHidden false
D/KeyguardViewMediator( 2029): setHidden false
I/ActivityManager( 2029): Process com.ktxsoftware.Empty (pid 19089) has died.

I'm guessing it's something about shaders, but I don't understand it.

That's another issue. I suggest you use android-native (NDK/C++) backend instead of android (SDK/java) backend of Kha since the latter is young.

node Kha/make android-native

As to the shader compile error, delete all these in the generated shader files

#extension GL_OES_EGL_image_external : require
uniform samplerExternalOES tex;

under your build/android/Empty/app/source/main/assets/*.essl will make it work.

But I do suggest you use android-native backend at the present.

The Loader issue is now fixed in the repo, too.
Also tried to fix the shader issue - it doesn't occur on my device, but I did what the error message demands, so hopefully that works. Windows binary of the shader compiler is updated, will update the OSX and Linux binaries later today.

@forafish Thanks for the advice. I tried android-native project, but there were two problems:

1. It took very long to build. For android (SDK?) project, it only took about 15 seconds to build. But for android-native it took about 30 minutes.
2. Even after 30 minutes, the build failed. I didn't record down the error message but I think the long build time itself is discouraging enough for me to try again.

For your suggestion to fix the shader compile error, I tried removing it but it still fails silently. The error message I get now is:

E/AndroidRuntime(19567): 0:4: L0001: Typename expected, found 'samplerExternalOES'

Oh, thanks for looking into the issues @Robert ! Will check the updates tomorrow.

Alright I used Android Studio to build instead of using the terminal, and now it builds fine!

Now there's another problem, but I think it could be my device being really slow: I built two projects, one is Dmitry's bunnymark (https://github.com/dmitryhryppa/Frameworks_test/tree/master/bunnymark/kha) and another is my own version of it, which uses haxe.Timer.stamp() for calculating FPS rate.

For my version, the FPS is -1 and somehow the game freezes.
For Dmitry's version, the framerate is really low (average 8fps).

I don't know what the problem is but since Dmitry's code is working (albiet really slow) I'll just assume there's something wrong with my version's code, so... it isn't Kha's issue I hope.

Is that android or android-native? Because android is pretty new and I didn't yet do any performance work for it.
Hint for android-native: By default it compiles for all supported architectures - you can use the Build Variants tab to change that.

Oh and you can use kha.Scheduler.realtime(). Not sure about haxe.Timer.

@Robert It was on android. I built using android-native in Android Studio, and it now works perfectly fine. Thank you!