从 ImageView 而不是 Drawable 获取图像

Question

Right now what this code is doing? It is reading an image from drawable and then getting the text from it using google vision.

 Bitmap bitmap = BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.changing);
        TextRecognizer textRecognizer = new TextRecognizer.Builder(getApplicationContext()).build();

        if(!textRecognizer.isOperational()){
            Toast.makeText(getApplicationContext(), "", Toast.LENGTH_SHORT).show();
        }
        else
        {
            Frame frame = new Frame.Builder().setBitmap(bitmap).build();

            SparseArray<TextBlock> item = textRecognizer.detect(frame); //Yeh Frame Detect Kr rha he

            StringBuilder sb = new StringBuilder();
            for(int i = 0 ; i<item.size();i++){
                TextBlock myitem = item.valueAt(i);
                sb.append(myitem.getValue());
                sb.append("\n");
            }

R.drawable.changing is where "changing" is my image name. Now i want to replace the image with the image i uploaded on ImageView.

Any help would work.

Answer 1

You can simply use ImageView.getDrawable() to get the image from an ImageView. However, the drawable is not necessarily a BitmapDrawable (I think your changing drawable is).

To get an actual bitmap of the ImageView's drawable, you might have to look a bit further, on how to create a bitmap from an Android drawable. There are many answers to that in StackOverflow, so I will not repeat that here.

Basically, it's creating a Bitmap and a Canvas and then let the Drawable draw itself into the Bitmap, via the Canvas.

Answer 2

You can get the Bitmap from imageview like this

Drawable dr = ((ImageView) imView).getDrawable();
Bitmap bmp =  ((GlideBitmapDrawable)dr.getCurrent()).getBitmap();

Answer 3

if you want to get image from drawable you can try this :

imageView.invalidate();
BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
Bitmap bitmap = drawable.getBitmap();

if you are getting image from resource like gallery:

if (requestCode == SELECT_FILE)
    {
        Uri selectedImageUri = data.getData();
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImageUri);
            imageview.setImageBitmap(bitmap);
    }

Another option for getting image is from camera:

if(requestCode == REQUEST_CAMERA)
        {
            Bundle bundle = data.getExtras();
            final Bitmap bmp = (Bitmap) bundle.get("data");
            imageview.setImageBitmap(bmp);
        }

where SELECT_FILE & REQUEST_CAMERA is just an integer:

int SELECT_FILE = 0;
int REQUEST_CAMERA = 1;