如何在paintview中更改画布的风景

Question

我有以下代码，其中包含几个位图，具体取决于用户选择的位图，但默认情况下希望它们处于横向状态。我该怎么做？我试着将setRequestorientation方法放进去，但是它只有一个错误，指出要为此添加一个方法？我认为还有其他方法可以做到这一点...

    public void original_version() {
        DisplayMetrics metrics = new DisplayMetrics();
        int height = metrics.heightPixels+1900;
        int width = metrics.widthPixels+1800;

        background = BitmapFactory.decodeResource(getResources(), R.mipmap.worksheetblank);



        float scale = Math.min(((float) height / background.getWidth()), ((float) width / background.getHeight()));

        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);


        //  background = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        mBitmap = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888);
        // background = Bitmap.createBitmap(background, 0, 0, width, height, matrix, true);
        background = Bitmap.createBitmap(background, 0, 0, background.getWidth(), background.getHeight(), matrix, true);
        mCanvas = new Canvas(mBitmap);
        mCanvas2 = new Canvas(background);

   //     mCanvas2.drawBitmap(background, 20,20, mPaint);
    //    mCanvas.drawBitmap(mBitmap, 0, 0, mPaint);
        invalidate();
    }

    public void pro() {
        DisplayMetrics metrics = new DisplayMetrics();
        int height = metrics.heightPixels+2000;
        int width = metrics.widthPixels+2000;
     //   int height = 1000;
     //   int width = 1600;


        background = BitmapFactory.decodeResource(getResources(), R.mipmap.worksheetblank2);
    //    background = Bitmap.createScaledBitmap(background, width, height, false);

        float scale = Math.min(((float) height / background.getWidth()), ((float) width / background.getHeight()));

       Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);


        //  background = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        mBitmap = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888);
        // background = Bitmap.createBitmap(background, 0, 0, width, height, matrix, true);
      background = Bitmap.createBitmap(background, 0, 0, background.getWidth(), background.getHeight(), matrix, true);
        mCanvas = new Canvas(mBitmap);
        mCanvas2 = new Canvas(background);

    //    mCanvas2.drawBitmap(background, 20,20, mPaint);
   //     mCanvas.drawBitmap(mBitmap, 0, 0, mPaint);
        invalidate();
    }

    public void pro2() {
        DisplayMetrics metrics = new DisplayMetrics();
        int height = metrics.heightPixels+4000;
        int width = metrics.widthPixels+4000;

     //   int height = 1000;
     //   int width = 3600;

        background = BitmapFactory.decodeResource(getResources(), R.mipmap.worksheetblank3);



        float scale = Math.min(((float) height / background.getWidth()), ((float) width / background.getHeight()));

        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);


        //  background = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        mBitmap = Bitmap.createBitmap(height, width, Bitmap.Config.ARGB_8888);
        // background = Bitmap.createBitmap(background, 0, 0, width, height, matrix, true);
        background = Bitmap.createBitmap(background, 0, 0, background.getWidth(), background.getHeight(), matrix, true);





        mCanvas = new Canvas(mBitmap);
        mCanvas2 = new Canvas(background);

        //mCanvas2.drawBitmap(background, 20,20, mPaint);
   //    mCanvas.drawBitmap(mBitmap, 0, 0, mPaint);
        invalidate();


    }