Touch(surface) on android does not give accurate touch coordinates, and multitouch is not tracked(beyond touch #0) It does work in chrome on android, html5.

Also how does the screensize work on android. It seems like its just scaled and centered but its hard to tell. Thanks. Example code below.

package;

import kha.Game;
import kha.Framebuffer;
import kha.Color;
import kha.graphics2.Graphics;
import kha.Image;
import kha.Loader;
import kha.Scaler;
import kha.math.FastMatrix3;
import kha.Scheduler;
import kha.Configuration;
import kha.LoadingScreen;
import kha.input.Mouse;
import kha.input.Surface;
import haxe.ds.Vector;

class Empty extends Game {
var backbuffer:Image;
var g:Graphics;

var mouse:kha.input.Mouse;
var mouseX:Int = 0;
var mouseY:Int = 0;
var mouseButton:Bool = false;

//touch vars
var __touch:Surface;
var touch:Vector<Bool>;
var touchX:Vector<Int>;
var touchY:Vector<Int>;

public function new() {
	super("Empty", false);
}	

override function init(): Void
{
	//setup mouse
	mouse = kha.input.Mouse.get(0);
	if (mouse != null)mouse.notify(TestMouseDown, TestMouseUp, TestMouseMove, TestMouseWheel);
	
	//setup touch
	touch = new Vector(10);
	touchX = new Vector(10);
	touchY = new Vector(10);
	__touch = Surface.get(0);
	if (__touch != null)__touch.notify(touchDown, touchUp, touchMove);
	for (i in 0...10)
	{
		touch[i] = false;
	}
	
	backbuffer = Image.createRenderTarget(width, height);
	Configuration.setScreen(this);
}

override function render(frame: Framebuffer): Void 
{	
	g = backbuffer.g2; 
	g.begin();
	g.clear(Color.Black);
	
	g.transformation = FastMatrix3.identity();
	
	if (mouseButton)
	{
		g.set_color(Color.Blue);
		g.fillRect(mouseX -20, mouseY -20, 40, 40);
	}
	
	for (i in 0...10)
	{
		if (touch[i])
		{
			g.set_color(Color.Red);
			g.fillRect(touchX[i] -20, touchY[i] -20, 40, 40);
		}
	}
	
	g.end(); 
	 		 
	startRender(frame);
	Scaler.scale(backbuffer, frame, kha.Sys.screenRotation);
	endRender(frame);
}

override function update()
{
	
}

//<mouse stuff>
private function TestMouseDown(button:Int, x:Int, y:Int)
{
	mouseButton = true;
	mouseX = x;
	mouseY = y;
}

private function TestMouseUp(button:Int, x:Int, y:Int)
{
	mouseButton = false;
	mouseX = x;
	mouseY = y;
}

private function TestMouseMove(x:Int, y:Int,xMovement:Int,yMovement:Int)
{
	mouseX = x;
	mouseY = y;
}

private function TestMouseWheel(wheel:Int)
{
	//not done...
}
//</mouse stuff>

//<touch stuff>

public function touchDown(touchNum:Int,x:Int,y:Int)
{
	touch[touchNum] = true;
	touchX[touchNum] = x;
	touchY[touchNum] = y;
}

public function touchUp(touchNum:Int,x:Int,y:Int)
{
	touch[touchNum] = false;
	touchX[touchNum] = x;
	touchY[touchNum] = y;
}

public function touchMove(touchNum:Int,x:Int,y:Int)
{
	touch[touchNum] = true;
	touchX[touchNum] = x;
	touchY[touchNum] = y;
}
//</touch stuff>

}

Will have to have a look at multitouch.
Scaling and centering though is done by the Scaler.scale call. You can remove that and handle it yourself.

Awesome, thanks Rob. So whats happening between startrender and endrender? Am i just copying an image buffer to the screen (and scaler.scale is making it "look right") I know theres alot more going on in g4 but for the sake of g2 is that the basic idea?

Just to confirm; I've used multitouch before and it matched my touch input.

I think I fixed multitouch correctly way back.

startrender/endrender will just call g.begin/end. Scale takes an image and draws it into another buffer (in this case the final framebuffer). When you replace the g = backbuffer.g2 line with g = frame.g2 you will render into the framebuffer right away.

Disar, you fixed it in android-native, but it was Java code - I basically just have to take that and put it into the android backend.

Thanks for the explanation Robert.