How to use onDraw(Canvas) to obtain a bitmap snapshot of the WebView(Android)

Question

I used to use capturePicture() method to make a snapshot of my WebView. This method was deprecated in API level 19.

The doc say that "Use onDraw(Canvas) to obtain a bitmap snapshot of the WebView", but I really don't know how it means.

Will you please teach me how to solve the problem?

Thank you! But onDraw(canvas) is protected. I can`t just call it. And it returns nothing. — Richard Guan, Nov 08 '13 at 10:43
extend WebView and call it from there, use a Canvas created by new Canvas(Bitmap) — pskink, Nov 08 '13 at 10:56
Like this? Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_4444); this.draw(new Canvas(bitmap)); — Richard Guan, Nov 09 '13 at 17:34
mWebView.getWidth() and mWebView.getHeight(), in fact i need mWebView.getWidth() and mWebView.getContentHeight() — Richard Guan, Nov 10 '13 at 01:36

score 4 · Answer 1 · edited Mar 24 '14 at 19:17

4

The following should work:

float scale = webView.getScale();
int webViewHeight = (int)(webView.getContentHeight() * scale);
Bitmap image = Bitmap.createBitmap(webView.getWidth(), webViewHeight, Config.ARGB_8888);
Canvas canvas = new Canvas(image);
webView.draw(canvas);

edited Mar 24 '14 at 19:17

loeschg

29,961
26
97
150

answered Nov 11 '13 at 01:33

Richard Guan

137
2
7

3

Do you capture entire the webview or just things which are visible? I meant if the web content is long, can your method capture all the entire? – lolyoshi Jan 06 '14 at 14:15
@lolyoshi `WebView.draw()` will indeed capture all the content, but I'm not sure if `WebView.getWidth()` will return the correct width for the content, I still have to check that for the app I'm working on. – JAB Mar 07 '14 at 20:56
Yes! Using getContentHeight() * getScale() does captures entire page not just a visible content. – Pioneer Mar 20 '15 at 05:31
1

On Android 6.0 it does NOT capture the entire view, only the visible part. – Patrick Nov 23 '15 at 18:10
getScale() is deprecated – Abhay Sood Nov 25 '15 at 13:11
out of memory exception. can anyone help please. I just need to capture visible area. Also `getScale()` is deprecated – Surinder Feb 02 '16 at 14:20

How to use onDraw(Canvas) to obtain a bitmap snapshot of the WebView(Android)

1 Answers1

Linked