on device text-recognition (MLKit-TextRecognition repository)

MainActivity.java

    private void runTextRecognition() {
       FirebaseVisionImage image = FirebaseVisionImage.fromBitmap(((GlideBitmapDrawable)imageView.getDrawable()).getBitmap());
       FirebaseVisionTextRecognizer detector = FirebaseVision.getInstance()
                .getOnDeviceTextRecognizer();
        detector.processImage(image)
                .addOnSuccessListener(
                        new OnSuccessListener<FirebaseVisionText>() {
                            @Override
                            public void onSuccess(FirebaseVisionText texts) {
                                processTextRecognitionResult(texts);
                            }
                        })
                .addOnFailureListener(
                        new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                e.printStackTrace();
                            }
                        });
    }

    private void processTextRecognitionResult(FirebaseVisionText texts) {
        List<FirebaseVisionText.TextBlock> blocks = texts.getTextBlocks();
        if (blocks.size() == 0) {
            showToast("No text found");
            return;
        }
        mGraphicOverlay.clear();
        imageView.setImageDrawable(getResources().getDrawable(R.drawable.no_image));
        for (int i = 0; i < blocks.size(); i++) {
            List<FirebaseVisionText.Line> lines = blocks.get(i).getLines();
            for (int j = 0; j < lines.size(); j++) {
                List<FirebaseVisionText.Element> elements = lines.get(j).getElements();
                for (int k = 0; k < elements.size(); k++) {
                    Graphic textGraphic = new TextGraphic(mGraphicOverlay, elements.get(k));
                    mGraphicOverlay.add(textGraphic);
                }
            }
        }
    }