从WebView保存图像

Question

我会尽量做空 - 所以我正在制作这个应用程序,将图像上传到自定义Webview,绘制画布并保存.现在我成功地执行了所有操作,直至保存它.我尝试了很多不同的方法,但都没有.

我保存未经编辑的图像Url:

public void DownloadFromUrl(String fileName) {  //this is the downloader method
    try {
        URL url = new URL(wv2.getUrl()); //you can write here any link
        File file = new File(fileName);
        Canvas canvas = new Canvas();
        wv2.draw(canvas );

        long startTime = System.currentTimeMillis();                   
        Log.d("ImageManager", "download begining");
        Log.d("ImageManager", "download url:" + url);
        Log.d("ImageManager", "downloaded file name:" + fileName);
        URLConnection ucon = url.openConnection();

        InputStream is = ucon.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(is);

        ByteArrayBuffer baf = new ByteArrayBuffer(50);
        int current = 0;
        while ((current = bis.read()) != -1) {
            baf.append((byte) current);
        }

        FileOutputStream fos = new FileOutputStream(file);
        fos.write(baf.toByteArray());
        fos.close();
        Log.d("ImageManager", "download ready in"
                        + ((System.currentTimeMillis() - startTime) / 1000)
                        + " sec");
    } catch (IOException e) {
        Log.d("ImageManager", "Error: " + e);
    }
}

我在自定义中的绘制功能webview如下所示:

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw (canvas);
    /*code that draws different stuff*/
}

要显示已编辑的图像,我想我需要使用它:

canvas = new Canvas(mutableBitmap);                 
wv2.draw(canvas);
tstImage.setImageBitmap(mutableBitmap);

但同样,我不知道如何将画布合并到图像中.我应该使用绘图缓存吗？如果是,那怎么样？

[UPDATE]

好的,所以我设法使用此代码保存编辑过的图像

wv2.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(wv2.getDrawingCache());
wv2.setDrawingCacheEnabled(false);
tstImage.setImageBitmap(bitmap);
SaveImage(bitmap);

SaveImage的地方:

private void SaveImage(Bitmap finalBitmap) {
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/Pictures/");    
    myDir.mkdirs();

    String fname = "Image-"+ count +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

我唯一的问题是我得到的图像就是当时webview中显示的图像.因此,如果我缩放图像,它只会保存一部分.

[更新2]

我已经修改了其中一个答案来寻找解决方案,这就是我写的.没有显示图像.

   File imageFile = new File("file://" +    
    Environment.getExternalStorageDirectory() + "/Pictures/" + count + ".jpg");
                        String location = new String("file://" + Environment.getExternalStorageDirectory() + "/Pictures/" + count + ".jpg");
                        if(imageFile.exists()){
                            Bitmap myBitmap = BitmapFactory.decodeFile(location);
                            Bitmap mutableBitmap = myBitmap.copy(Bitmap.Config.ARGB_8888, true);
                            Canvas canvas = new Canvas(mutableBitmap);
                            wv2.draw(canvas);
                            tstImage.setImageBitmap(mutableBitmap);
                        }

Answer 1

为什么不使用BitmapFactory从网络上获取的文件创建一个位图，然后将其写出而不是快照WebView？