Как получить ширину и высоту Webview в андроиде

Hmmm - I looked through the WevView source and I can see that internally they are using View#getWidth and View#getHeight here's one of the WebView's private methods:

/*
 * Return the width of the view where the content of WebView should render
 * to.
 */
private int getViewWidth() {
    if (!isVerticalScrollBarEnabled() || mOverlayVerticalScrollbar) {
        return getWidth();
    } else {
        return getWidth() - getVerticalScrollbarWidth();
    }
}

As noted in the comments you have to make sure you are measuring it after you assign the activity layout e.g. setContentView(R.layout.mylayout);