Question

我有一个问题。当我获得捕获webview时，我的平板电脑中没有捕获画布区域...但内容很好。我不明白...... 但奇怪的是......

如果我提供选项＆＃39; webView.setLayerType（WebView.LAYER_TYPE_SOFTWARE，null）;＆＃39;保存后出现笔数据（画布），但绘图真的很慢......

这是我的来源..

@SuppressLint("SetJavaScriptEnabled")
private void setWebviewInit(WebView webview) {
    webview.setInitialScale(1);
    webview.getSettings().setJavaScriptEnabled(true);
    webview.getSettings().setUseWideViewPort(true);
    webview.getSettings().setLoadWithOverviewMode(true);

    webview.getSettings().setSupportZoom(true);
    webview.getSettings().setBuiltInZoomControls(true);
    webview.getSettings().setDisplayZoomControls(false);

    webview.setWebViewClient(webviewclient);
    webview.setWebChromeClient(new WebviewAlert());
    webview.setWebChromeClient(new ChromeClient(this));
    webview.addJavascriptInterface(new JIFace(), "ezandroid");
}

//捕获

        WebView webview = arrWebView.get(0);

    webview.measure(MeasureSpec.makeMeasureSpec(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED),MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    webview.layout(0, 0, webview.getMeasuredWidth(), webview.getMeasuredHeight());
    webview.setDrawingCacheEnabled(true);
    webview.buildDrawingCache();
    Bitmap bitmap = Bitmap.createBitmap(webview.getMeasuredWidth(), webview.getMeasuredHeight(),Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint();
    int height = bitmap.getHeight();
    canvas.drawBitmap(bitmap, 0, height, paint);
    webview.draw(canvas);

    if(penBitmap != null){
        bitmap = combineBitmaps(bitmap, penBitmap, OVERLAY);
    }
    int fullHeight = webview.getMeasuredHeight();
    int pageHeight = (int) (1122*WEBVIEW_SCALE_RATE);
    int croppedStart = 0;

    int cnt;
    if(fullHeight == pageHeight){
        cnt =1;
    }else{
        cnt = (fullHeight / pageHeight) + 1;
    }

    ArrayList<String> localFilePath = new ArrayList<String>();

    for (int i = 0; i < cnt + 1; i++) { // 0: full Img, else: cropped
        Bitmap croppedBitmap = null;
        if (i!=cnt) {
            if ((croppedStart + pageHeight) > webview.getMeasuredHeight()) {
                int lastHeight = webview.getMeasuredHeight() - croppedStart;
                croppedBitmap = Bitmap.createBitmap(bitmap, 0, croppedStart, webview.getMeasuredWidth(),lastHeight-1);
            } else {
                try{
                croppedBitmap = Bitmap.createBitmap(bitmap, 0, croppedStart, webview.getMeasuredWidth(), pageHeight);
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
            croppedStart += pageHeight;
        }
        if (bitmap != null) {
            try {
                String filePath = Environment.getExternalStorageDirectory().toString();
                OutputStream out = null;
                File file = new File(filePath, "test");
                if(!file.exists()){
                    file.mkdir();
                }
                out = new FileOutputStream(filePath + "/test/consentImg" + i + ".jpeg");
                localFilePath.add(filePath + "/test/consentImg" + i + ".jpeg");

                if(i==cnt){
                    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
                }else{
                    croppedBitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
                }

                if(croppedBitmap != null){
                    croppedBitmap.recycle();
                    croppedBitmap = null;
                }
                out.flush();
                out.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    bitmap.recycle();

Answer 1

您需要在创建任何WebView之前调用WebView.enableSlowWholeDocumentDraw（）。

@Override
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        WebView.enableSlowWholeDocumentDraw();
    }
    ...
    setContentView(layout);
    ...
    ...
}

Answer 2

仅仅添加WebView.enableSlowWholeDocumentDraw（）是不够的，我仍然将空白图像保存到我的SD卡中。经过大量的谷歌搜索后，我找到了解决方案。您需要为webview禁用硬件加速，如下所示：

mWebview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);

Answer 3

解决。在保存时，我制作了一张图片，然后我把它放在webview的背景上......

Answer 4

问题在于硬件加速。
将其关闭应该可以。

<application android:hardwareAccelerated="false">

如何在Android webview中捕获html5画布？

4 个答案: