用相机拍摄图像

Question

这是我要在图像上写的功能 但我的日志显示位图（bmp）为空 并且函数bmp.getwidth（）在空对象引用上 任何人都可以请我帮忙，因为我正在使用未缩放的位图

edit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {                
            try{
                File file =new File(Environment.getExternalStorageDirectory()+"/GUI/temp.jpg");
                Uri uri=Uri.fromFile(file);
                BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
                bmpFactoryOptions.inJustDecodeBounds = true;

                try {
                    if(uri !=null){
                        Log.d("uri2", "onClick: uri is not null");
                        bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, bmpFactoryOptions);

                        if(bmp==null){
                            Log.d("bitmap", "onClick: bitmap is null");
                        }
                        else{
                            alteredBitmap = Bitmap.createBitmap(bmp.getWidth(), bmp
                                    .getHeight(), bmp.getConfig());
                        }

                        bmpFactoryOptions.inJustDecodeBounds = false;
                        canvas = new Canvas(alteredBitmap);
                        paint = new Paint();
                        paint.setColor(Color.GREEN);
                        paint.setStrokeWidth(5);
                        matrix = new Matrix();
                        canvas.drawBitmap(bmp, matrix, paint);
                        img.setImageBitmap(alteredBitmap);
                    }else{
                        Log.d("uri", "onClick: uri is null");
                    }


                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }catch (Exception e){
                Log.d("uri", "onClick: uri is null yes"+e.getMessage());
            }


        }
    });