从WebView保存图像

我会尽量做空 – 所以我正在创建这个应用程序,将图像上传到自定义Webview ,绘制canvas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。

我从Url保存未经编辑的图像:

 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webview绘制function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canvas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); } 

Solutions Collecting From Web of "从WebView保存图像"

尝试这个

 Bitmap workingBitmap = Bitmap.createBitmap(chosenFrame); Bitmap mutableBitmap = workingBitmap.copy(Bitmap.Config.ARGB_8888, true); Canvas canvas = new Canvas(mutableBitmap); 

你为什么不用你使用BitmapFactory从网上获得的文件创建一个位图然后写出来而不是快照WebView