位图绘制（地图覆盖项目）在Android中旋转后pixelizes [英] Bitmap drawable (Map Overlay Item) pixelizes after rotation in android

问题描述

我试图旋转覆盖绘重新present叠加项的Andr​​oid。

I'm trying to rotate an overlay drawable to represent an overlay item in Android.

我用这样的：

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);

的问题是，图像质量变差。像素化情况发生。任何解决方案？

The problem is that the image quality worsens. Pixelization happens. Any solution?

推荐答案

这code。与我工作完全

This code worked perfectly with me

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);

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