android imageview 获取bitmap缩放大小

可以使用以下代码获取 ImageView 中的 Bitmap 缩放大小：

imageView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        imageView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        int width = imageView.getWidth();
        int height = imageView.getHeight();
        Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
        int bitmapWidth = bitmap.getWidth();
        int bitmapHeight = bitmap.getHeight();
        float scaleX = (float) width / bitmapWidth;
        float scaleY = (float) height / bitmapHeight;
        float scale = Math.min(scaleX, scaleY);
        int scaledWidth = (int) (bitmapWidth * scale);
        int scaledHeight = (int) (bitmapHeight * scale);
        // scaledWidth 和 scaledHeight 就是缩放后的大小
    }
});