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fun onTouch(x:Float, y:Float) {
val meteringPoint = new DisplayOrientedMeteringPointFactory(mSurfaceView.getDisplay(), cameraSelector, mSurfaceView.getWidth(), mSurfaceView.getHeight()).createPoint(x.y);
// Prepare focus action to be triggered.
val action = FocusMeteringAction.Builder(meteringPoint).build();
// Execute focus action
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