TouchScreen Testing 101

So you this nice android application but you need  to test the UI using some touch screen touch events in which you the developer supply the x and y coords in you test class. Right now there is not a TouchUtils method for this set of use cases. The method I came up with probably looks like this:

/**
	 *
	 * @param test
	 * @param view
	 * @param touchX in DIPs
	 * @param touchY in DIPs
	 */
	static void touchPoint(InstrumentationTestCase test, View view, float touchX, float touchY, Activity activity ) {

		Instrumentation inst = test.getInstrumentation();
        float screenDensity;
        float screenWidthPx;
        float screenHeightPx;
        float touchTempX;
        float touchTempY;
        long downTime = SystemClock.uptimeMillis();
        long eventTime = SystemClock.uptimeMillis();

        /**
         * 1 dip = 1 pixel thus
         * dip x density = pixels
         *
         * density of 1 equals
         * 160 dpi 240x320 baseline display or 1.5"x2"
         */
        DisplayMetrics dm = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        screenDensity = dm.density;
        screenHeightPx = dm.heightPixels;
        screenWidthPx = dm.widthPixels;

        if (touchX * screenDensity <= screenWidthPx){
        	touchTempX = touchX * screenDensity;
        }else{
        	touchTempX = 1;
        }
        if (touchY * screenDensity <= screenHeightPx) {
        	touchTempY = touchY *screenDensity;
        }else{
        	touchTempY = 1;
        }

        // touch down
        MotionEvent event = MotionEvent.obtain(downTime, eventTime,
                    MotionEvent.ACTION_DOWN, touchTempX, touchTempY, 0);
        inst.sendPointerSync(event);
        inst.waitForIdleSync();
        // touch up
        MotionEvent eventUp = MotionEvent.obtain(downTime, eventTime,
                    MotionEvent.ACTION_UP, touchTempX, touchTempY, 0);
        inst.sendPointerSync(eventUp);
        inst.waitForIdleSync();

	}

It should work. notice that it defaults to coords of 1,1 if you the developer goof up on your x and y cordinate inputs as its expected that you input your x and Y coordinates in terms of DIP not pixels so that your unit tests will always work no mater what the screen size.