android - 位图可绘制( map 叠加项)在android中旋转后像素化

Question

我正在尝试旋转叠加层可绘制对象以表示 Android 中的叠加项。

我用这个:

Bitmap bmpOriginal = BitmapFactory.decodeResource(this.getResources(), R.drawable.map_pin);
        Bitmap targetBitmap = Bitmap.createBitmap((bmpOriginal.getWidth()),
                (bmpOriginal.getHeight()), 
                Bitmap.Config.ARGB_8888);

        Matrix matrix = new Matrix();       
        matrix.setRotate((float) lock.getDirection(),(float) (bmpOriginal.getWidth()/2),
                (float)(bmpOriginal.getHeight()/2));

        Canvas tempCanvas = new Canvas(targetBitmap); 
            tempCanvas.drawBitmap(bmpOriginal, matrix, null);
Drawable d = new BitmapDrawable(getResources(),targetBitmap);

            //overlayitem.setMarker(drawable);

    mapItemizedOverlay =
                    new MyItemizedOverlay<MyItemizedOverlayItem>(d, mapView);

问题是图像质量变差了。像素化发生了。有什么解决办法吗？

Answer 1

这段代码非常适合我

Bitmap bmpOriginal = BitmapFactory.decodeResource(this.getResources(), R.drawable.map_pin);
        Bitmap targetBitmap = Bitmap.createBitmap((bmpOriginal.getWidth()),
                (bmpOriginal.getHeight()), 
                Bitmap.Config.ARGB_8888);
        Paint p = new Paint();
        p.setAntiAlias(true);
        p.setDither(true);
        p.setFilterBitmap(true);

        Matrix matrix = new Matrix();       
        matrix.setRotate((float) lock.getDirection(),(float) (bmpOriginal.getWidth()/2),
                (float)(bmpOriginal.getHeight()/2));

        RectF rectF = new RectF(0, 0, bmpOriginal.getWidth(), bmpOriginal.getHeight());
        matrix.mapRect(rectF);

        targetBitmap = Bitmap.createBitmap((int)rectF.width(), (int)rectF.height(), Bitmap.Config.ARGB_8888);


        Canvas tempCanvas = new Canvas(targetBitmap); 
        tempCanvas.drawBitmap(bmpOriginal, matrix, p);