android - 在Android中将 Canvas 保存为图像

Question

我将类从DrawingView扩展到View并在其上绘制路径一切正常
但当我试图将画布保存为图像时，它不起作用。
这是我正在尝试的代码。

// drawView is an object of DrawingView class
drawView.setDrawingCacheEnabled(true);
                String imgSaved = MediaStore.Images.Media.insertImage(
                        getContentResolver(), drawView.getDrawingCache(),
                        UUID.randomUUID().toString()+".png", "drawing");
                if(imgSaved!=null){
                    Toast savedToast = Toast.makeText(getApplicationContext(),
                            "Drawing saved to Gallery!", Toast.LENGTH_SHORT);
                    savedToast.show();
                }
                else{
                    Toast unsavedToast = Toast.makeText(getApplicationContext(),
                            "Oops! Image could not be saved.", Toast.LENGTH_SHORT);
                    unsavedToast.show();
                }
                drawView.destroyDrawingCache();

我总是收到消息 Oops! Image could not be saved.这段代码有什么问题为什么不保存它？

Answer 1

答案取自Stackoverflow Answer
但是需要一些小的改变，比如有拼写错误file.seperator和ile.separator一起改变，并且没有try块。
只需将content更改为drawView
最终代码：

try {
    drawView.setDrawingCacheEnabled(true);
    Bitmap bitmap = drawView.getDrawingCache();
    File f = null;
    if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
         File file = new File(Environment.getExternalStorageDirectory(),"TTImages_cache");
         if(!file.exists()){
             file.mkdirs();
         }
         f = new File(file.getAbsolutePath()+file.separator+ "filename"+".png");
    }
    FileOutputStream ostream = new FileOutputStream(f);
    bitmap.compress(Bitmap.CompressFormat.PNG, 10, ostream);
    ostream.close();
} catch(Exception e){
    e.printStackTrace();
}