Question

I am trying to display an image on a Canvas, but when I call the drawBitmap method, I get only the VERY top left corner, the image doesn’t scale to the the screen height and width. Here is my code that involves the custom view:

    private class ImageOverlay extends View {

    public ImageOverlay(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        Bitmap image = BitmapFactory.decodeFile(getPath(baseImage));
        Paint paint = new Paint();
        paint.setAlpha(200);

        canvas.drawBitmap(image, 0, 0, paint);
        Log.v(TAG, "Drew picture");

        super.onDraw(canvas);           
    }

    private String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if(cursor!=null)
        {
            int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        }
        else return null;
    }

baseImage is a Uri object that is passed to my activity and it is NOT null! Here is the actual image:

And here is the Canvas image:

Answer 1

but when I call the drawBitmap method, I get only the VERY top left corner, the image doesn’t scale to the the screen height and width.

You’re telling your programm to do so: canvas.drawBitmap(image, 0, 0, paint);
As (0,0) is the top left corner.

If you need a smaller image, you should downscale it, an possibility would be
Bitmap small = Bitmap.createScaledBitmap(image, width, height, false);