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

public boolean checkRenderView(WebView view)
{
    if(state == null)
    {
        setBitmap(view);
        return false;
    }
    else
    {
        Picture p = view.capturePicture();
        Bitmap newState = Bitmap.createBitmap(p.getWidth(), p.getHeight(), Bitmap.Config.ARGB_8888);
        boolean result = newState.equals(state);
        newState.recycle();
        return result;
    }
}
 

public boolean checkRenderView(WebView view)
{
    if(state == null)
    {
        setBitmap(view);
        return false;
    }
    else
    {
        Picture p = view.capturePicture();
        Bitmap newState = Bitmap.createBitmap(p.getWidth(), p.getHeight(), Bitmap.Config.ARGB_8888);
        boolean result = newState.equals(state);
        newState.recycle();
        return result;
    }
}
 

/**
 * 对WebView进行截图
 *
 * @param webView
 * @return
 */
private Bitmap captureWebView1(WebView webView) {
    Picture snapShot = webView.capturePicture();
    Bitmap bmp = Bitmap.createBitmap(snapShot.getWidth(), snapShot.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bmp);
    snapShot.draw(canvas);
    return bmp;
}
 

private Bitmap captureWebView(WebView webView) {
    Picture picture = webView.capturePicture();
    int width = picture.getWidth();
    int height = picture.getHeight();
    if (width > 0 && height > 0) {
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        picture.draw(canvas);
        return bitmap;
    }
    return null;
}
 

private static Bitmap createType1(WebView webView, FileHelper.OnSavedToGalleryListener listener) {
    Picture picture = webView.capturePicture();
    int width = picture.getWidth();
    int height = picture.getHeight();
    Bitmap bitmap = null;
    if (width > 0 && height > 0) {
        bitmap = Bitmap.createBitmap(width, height, Config.RGB_565);
        Canvas canvas = new Canvas(bitmap);
        picture.draw(canvas);
    }
    return bitmap;
}
 

/**
 * Returns a bitmap of a given WebView.
 *  
 * @param webView the webView to save a bitmap from
 * @return a bitmap of the given web view
 * 
 */

private Bitmap getBitmapOfWebView(final WebView webView){
	Picture picture = webView.capturePicture();
	Bitmap b = Bitmap.createBitmap( picture.getWidth(), picture.getHeight(), Bitmap.Config.ARGB_8888);
	Canvas c = new Canvas(b);
	picture.draw(c);
	return b;
}
 

private static Bitmap captureWebView(WebView webView) {
    Picture snapShot = webView.capturePicture();
    if (snapShot == null) {
        return null;
    }
    Bitmap bmp = Bitmap.createBitmap(snapShot.getWidth(),
            snapShot.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bmp);
    snapShot.draw(canvas);
    return bmp;
}
 

/**
 * shoot the web view
 */
public static Bitmap shoot(WebView webView) {
    Picture snapShot = webView.capturePicture();
    Bitmap bitmap = Bitmap.createBitmap(snapShot.getWidth(), snapShot.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    snapShot.draw(canvas);
    return bitmap;
}
 

private Bitmap getBitmapFromWebView(WebView webView) {
    try {
        float scale = 1.0f / getResources().getDisplayMetrics().density;
        Picture picture = webView.capturePicture();
        Bitmap bitmap = Bitmap.createBitmap((int) (picture.getWidth() * scale), (int) (picture.getHeight() * scale), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.scale(scale, scale);
        picture.draw(canvas);
        return bitmap;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}
 

public void setBitmap(WebView view)
{
    Picture p = view.capturePicture();
    state = Bitmap.createBitmap(p.getWidth(), p.getHeight(), Bitmap.Config.ARGB_8888);
}
 

public void setBitmap(WebView view)
{
    Picture p = view.capturePicture();
    state = Bitmap.createBitmap(p.getWidth(), p.getHeight(), Bitmap.Config.ARGB_8888);
}