안드로이드 스튜디오 그림판 저장, 호출 관련 도움이 필요해요

Question

대학 기말로 그림판 저장, 호출과제인데 너무 어려워요. 어디를 고쳐야할지 모르겠습니다ㅠ

고쳐야 하는 부분을 고쳐 적어주실수 있으신가요? 제발 부탁드립니다ㅠ...

 

저장, 읽기 버튼
ibSave = (ImageButton) findViewById(R.id.ibSave);
        ibSave.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                //View view = getWindow().getDecorView();
                //View view = activity.findViewById(android.R.id.content);
                View view = findViewById(R.id.img);
                //View view = pictureLayout.getRootView();
                //View view = pictureLayout.getChildAt(0);

                String folder = "TEST";
                String name = "test";
                saveBitmaptoJpeg(view,folder, name);
            }
        });

        ibLoad = (ImageButton) findViewById(R.id.ibLoad);
        ibLoad.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                curShape = READ;
                graphicView.invalidate();
                mPaint.setColor(Color.RED);
                graphicView.invalidate();
            }
        });
====================================================================
저장관련
public void saveBitmaptoJpeg(View view, String folder, String name) {
        String ex_storage =Environment.getExternalStorageDirectory().getAbsolutePath();
        // Get Absolute Path in External Sdcard
        String foler_name = "/"+folder+"/";
        String file_name = name+".jpg"; //저장할 파일 이름
        String string_path = ex_storage+foler_name;

        File file_path;
        view.setDrawingCacheEnabled(true);
        // view.buildDrawingCache();
        Bitmap screenBitmap = view.getDrawingCache();



        try{
            file_path = new File(string_path, file_name);
            //File file = new File(string_path+file_name);
            if(!file_path.isDirectory()){
                file_path.mkdirs();
            }
            //if(file.isFile())
            //   file.delete();

            FileOutputStream out = new FileOutputStream(string_path+file_name);
            screenBitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
            out.flush();
            out.close();
            view.setDrawingCacheEnabled(false);
            Toast.makeText(getApplicationContext(),
                    file_name + " 이 저장됨", Toast.LENGTH_SHORT).show();
        }catch(FileNotFoundException exception){
            Log.e("FileNotFoundException", exception.getMessage());
        }catch(IOException exception){
            Log.e("IOException", exception.getMessage());
        }
    }

====================================================================

case READ:
                    //Paint paint = new Paint();
                    //paint.setColor(Color.WHITE);
                    String ex_storage =Environment.getExternalStorageDirectory().getAbsolutePath();
                    // Get Absolute Path in External Sdcard
                    String tmp = ex_storage + "/TEST/test.jpg";
                    Bitmap bitmap = BitmapFactory.decodeFile(tmp);
                    canvas.drawBitmap(bitmap,0,0,null);
                    bitmap.recycle();
                    curShape = LINE;
                    break;