android.webkit.WebView#getScale ( )源码实例Demo

private Bitmap captureWebView3(WebView wv) {
    try {
        float scale = wv.getScale();
        int height = (int) (wv.getContentHeight() * scale + 0.5);
        Bitmap bitmap = Bitmap.createBitmap(wv.getWidth(), height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        wv.draw(canvas);
        return bitmap;
    } catch (Exception e) {
        try {
            openCache(wv);
            return wv.getDrawingCache();
        } finally {
            closeCache(wv);
        }
    }
}
 

/**
 * 规避 contentHeight 异步变化
 * @return
 */
private boolean canWebViewScrollUp(WebView webView) {
    if (mWebViewContentHeight == 0) {
        mWebViewContentHeight = (int) (webView.getContentHeight() * webView.getScale());
    }
    final int offset = webView.getScrollY();
    final int range = mWebViewContentHeight - webView.getHeight();
    if (range == 0) {
        return false;
    }
    return offset > 2;
}
 

/**
 * 规避 contentHeight 异步变化
 * @return
 */
private boolean canWebViewScrollDown(WebView webView) {
    if (mWebViewContentHeight == 0) {
        mWebViewContentHeight = (int) (webView.getContentHeight() * webView.getScale());
    }
    final int offset = webView.getScrollY();
    final int range = mWebViewContentHeight - webView.getHeight();
    if (range == 0) {
        return false;
    }
    return offset < range - 2;
}
 

private static void createType2(WebView webView, FileHelper.OnSavedToGalleryListener listener) {
    float scale = webView.getScale();
    int webViewHeight = (int) (webView.getContentHeight() * scale + 0.5);
    Bitmap bitmap = Bitmap.createBitmap(webView.getWidth(), webViewHeight, Config.RGB_565);
    Canvas canvas = new Canvas(bitmap);
    webView.draw(canvas);
    try {
        FileHelper.saveImageToGallery(PalmApp.getContext(), bitmap, true, listener);
        bitmap.recycle();
    } catch (Exception e) {
        LogUtils.e(e.getMessage());
    }
}
 

/**
 * Sets the location of a {@code WebElement} 
 * 
 * @param webElement the {@code TextView} object to set location 
 * @param webView the {@code WebView} the text is shown in
 * @param x the x location to set
 * @param y the y location to set
 * @param width the width to set
 * @param height the height to set
 */

private void setLocation(WebElement webElement, WebView webView, int x, int y, int width, int height ){
	float scale = webView.getScale();
	int[] locationOfWebViewXY = new int[2];
	webView.getLocationOnScreen(locationOfWebViewXY);

	int locationX = (int) (locationOfWebViewXY[0] + (x + (Math.floor(width / 2))) * scale);
	int locationY = (int) (locationOfWebViewXY[1] + (y + (Math.floor(height / 2))) * scale);

	webElement.setLocationX(locationX);
	webElement.setLocationY(locationY);
}
 

private void invalidateDividersForWebView(WebView view, final boolean setForTop, boolean setForBottom, boolean hasButtons) {
    if (setForTop) {
        mDrawTopDivider = mTitleBar != null &&
                mTitleBar.getVisibility() != View.GONE &&
                //Not scrolled to the top.
                view.getScrollY() + view.getPaddingTop() > 0;
    }
    if (setForBottom) {
        //noinspection deprecation
        mDrawBottomDivider = hasButtons &&
                view.getScrollY() + view.getMeasuredHeight() - view.getPaddingBottom() < view.getContentHeight() * view.getScale();
    }
}
 

public static boolean isWebViewToBottom(WebView webview, int mTouchSlop) {
    return webview != null && ((webview.getContentHeight() * webview.getScale() - (webview.getHeight() + webview.getScrollY())) <= 2 * mTouchSlop);
}
 

private static boolean canWebViewScroll(WebView view) {
    //noinspection deprecation
    return view.getMeasuredHeight() < view.getContentHeight() * view.getScale();
}
 

public static boolean isWebViewToBottom(WebView webview, int mTouchSlop) {
    return webview != null && ((webview.getContentHeight() * webview.getScale() - (webview.getHeight() + webview.getScrollY())) <= 2 * mTouchSlop);
}
 

public static boolean isWebViewToBottom(WebView webView) {
    return webView != null && webView.getContentHeight() * webView.getScale() == (webView.getScrollY() + webView.getMeasuredHeight());
}
 

public static boolean isWebViewToBottom(WebView webView) {
    return webView != null && webView.getContentHeight() * webView.getScale() == (webView.getScrollY() + webView.getMeasuredHeight());
}