从Webview获取图像到ImageView

Question

I have a custom WebView . Inside it I've got an image. The WebView is zoomable. I want to reset zoom when I click a button, extract image from there and place inside ImageView .

So far, with the help of x-code I've managed to write this in onClickListener :

while (wv2.zoomOut()){
    wv2.setDrawingCacheEnabled(true);
    bitmap = Bitmap.createBitmap(wv2.getDrawingCache());
    bitmapPath = bitmap;
    wv2.setDrawingCacheEnabled(false);

    new Thread(new Runnable() {
        public void run() {
            SaveImage(bitmap);
        }
    }).start();

    tstImage.setImageBitmap(bitmap);
}

The WebView zooms out completely, but the Bitmap I get in ImageView is slightly zoomed in. I need to click 1 more time to get the whole bitmap inside the ImageView

Answer 1

I would say that the Javadoc of WebView.getDrawingCache() method explains your problem.

public Bitmap getDrawingCache (boolean autoScale)

...

Note about auto scaling in compatibility mode: When auto scaling is not enabled, this method will create a bitmap of the same size as this view . Because this bitmap will be drawn scaled by the parent ViewGroup, the result on screen might show scaling artifacts . To avoid such artifacts, you should call this method by setting the auto scaling to true . Doing so, however, will generate a bitmap of a different size than the view. This implies that your application must be able to handle this size.

In your code you simply have to make this change

bitmap = Bitmap.createBitmap(wv2.getDrawingCache(true));