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

@SuppressLint("WrongCall")
private Bitmap captureWebView2(@NonNull final WebView view) {
    openCache(view);
    int measureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
    view.measure(measureSpec, measureSpec);
    if (view.getMeasuredWidth() <= 0 || view.getMeasuredHeight() <= 0) {
        return null;
    }
    Bitmap bm;
    try {
        bm = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
    } catch (OutOfMemoryError e) {
        System.gc();
        try {
            bm = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.RGB_565);
        } catch (OutOfMemoryError ee) {
            closeCache(view);
            return captureWebView3(view);
        }
    }
    Canvas bigCanvas = new Canvas(bm);
    Paint paint = new Paint();
    int iHeight = bm.getHeight();
    bigCanvas.drawBitmap(bm, 0, iHeight, paint);
    view.draw(bigCanvas);
    closeCache(view);
    return bm;
}
 

/**
 * Create a picture out of {@link WebView}'s whole content
 *
 * @param webView The WebView to get contents from
 * @return A {@link Bitmap} or null
 */
@Nullable
public static Bitmap getBitmapFromWebView(final WebView webView) {
    try {
        //Measure WebView's content
        int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        webView.measure(widthMeasureSpec, heightMeasureSpec);
        webView.layout(0, 0, webView.getMeasuredWidth(), webView.getMeasuredHeight());

        //Build drawing cache and store its size
        webView.buildDrawingCache();
        int measuredWidth = webView.getMeasuredWidth();
        int measuredHeight = webView.getMeasuredHeight();

        //Creates the bitmap and draw WebView's content on in
        Bitmap bitmap = Bitmap.createBitmap(measuredWidth, measuredHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(bitmap, 0, bitmap.getHeight(), new Paint());

        webView.draw(canvas);
        webView.destroyDrawingCache();

        return bitmap;
    } catch (Exception | OutOfMemoryError e) {
        e.printStackTrace();
        return null;
    }
}
 

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();
    }
}
 

/**
 * Create a picture out of {@link WebView}'s whole content
 *
 * @param webView The WebView to get contents from
 * @return A {@link Bitmap} or null
 */
@Nullable
public static Bitmap getBitmapFromWebView(final WebView webView) {
    try {
        //Measure WebView's content
        int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        webView.measure(widthMeasureSpec, heightMeasureSpec);
        webView.layout(0, 0, webView.getMeasuredWidth(), webView.getMeasuredHeight());

        //Build drawing cache and store its size
        webView.buildDrawingCache();
        int measuredWidth = webView.getMeasuredWidth();
        int measuredHeight = webView.getMeasuredHeight();

        //Creates the bitmap and draw WebView's content on in
        Bitmap bitmap = Bitmap.createBitmap(measuredWidth, measuredHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(bitmap, 0, bitmap.getHeight(), new Paint());

        webView.draw(canvas);
        webView.destroyDrawingCache();

        return bitmap;
    } catch (Exception | OutOfMemoryError e) {
        e.printStackTrace();
        return null;
    }
}
 

/**
 * Create a picture out of {@link WebView}'s whole content
 *
 * @param webView The WebView to get contents from
 * @return A {@link Bitmap} or null
 */
@Nullable
public static Bitmap getBitmapFromWebView(WebView webView) {
    try {
        //Measure WebView's content
        int widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        webView.measure(widthMeasureSpec, heightMeasureSpec);
        webView.layout(0, 0, webView.getMeasuredWidth(), webView.getMeasuredHeight());

        //Build drawing cache and store its size
        webView.buildDrawingCache();
        int measuredWidth = webView.getMeasuredWidth();
        int measuredHeight = webView.getMeasuredHeight();

        //Creates the bitmap and draw WebView's content on in
        Bitmap bitmap = Bitmap.createBitmap(measuredWidth, measuredHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(bitmap, 0, bitmap.getHeight(), new Paint());

        webView.draw(canvas);
        webView.destroyDrawingCache();

        return bitmap;
    } catch (Exception | OutOfMemoryError e) {
        e.printStackTrace();
        return null;
    }
}
 

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

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());
}