安卓：保存帆布为JPEG / PNG SD卡上 [英] Android: Saving a canvas as a jpeg/png on SD card

问题描述

我有2张图像，一个我从我的摄像机视图得到的，另一种是在摄像头视图。
我要救我的SD卡上的这2图像的组合。我想我必须的Zork zith画布，但我不知道如何保存帆布成JPEG，即从画布中的数据写入到一个FileOutputStream

I have 2 images, one I get from my camera view, the other is upon the camera view. I want to save the combination of these 2 images on my SD card. I think I have to zork zith canvas but I don't know how to save a canvas into jpeg i.e. write the data from canvas into a FileOutputStream

下面是我的code

 output = new File(imagesFolder, fileName);
            ImageView view = (ImageView) gameactivity.findViewById(R.id.imageView3);
            view.setDrawingCacheEnabled(true);
            Bitmap bitmap2 = view.getDrawingCache();   
            FileOutputStream fos = null;
            try {
                fos = new FileOutputStream(output);
                fos.write(data);
                fos.close();
            } catch (FileNotFoundException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
              catch (IOException e) {
                    e.printStackTrace();
            }

            try {
                Bitmap bitmap = BitmapFactory.decodeFile(output.getAbsolutePath());
                Canvas canvas = new Canvas(bitmap);
                canvas.drawBitmap(bitmap2, null, null);
// HERE I HAVE TO SAVE THE CANVAS INTO JPEG
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

你能告诉我，如果这是一个很好的开始时？如何解决我的问题，我不觉得对堆栈中的类似的帖子很好的答案（因为我不希望我的画到画布视图）

Could you please tell me if that is a good begining? and how to solve my problem, I don't find good answers on the similar post on stack (as I don't want to draw my canvas into view)

推荐答案

画布只是提请位图的一种手段。

Canvas is just a means to draw to the Bitmap.

您应该已经创建了帆布与新的Canvas（MYBITMAP）; 。所以，当你在画布上画画，它吸引你的位图。

You should have created Canvas with new Canvas(myBitmap);. So when you draw on the Canvas, it draws to your bitmap.

因此​​，使用 MYBITMAP 。

String fileName = Environment.getExternalStorageDirectory() + "/test.png";
OutputStream stream = new FileOutputStream(fileName);
/* Write bitmap to file using JPEG or PNG and 80% quality hint for JPEG. */
myBitmap.compress(CompressFormat.PNG, 80, stream);
stream.close();

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