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我正在加载要绘制的位图，但它距屏幕右侧约 25 像素。我不确定为什么会这样。

   scaleWallpaperBitmap(R.drawable.board2);
   canvas.drawBitmap(board, 0, topOffset, null);

   private void scaleWallpaperBitmap(int res) {
      // read bitmap in project
      BitmapFactory.Options options = new BitmapFactory.Options();
      options.inJustDecodeBounds = true;
      BitmapFactory.decodeResource(getResources(), res, options);
      int imgH = options.outHeight;
      int imgW = options.outWidth;

    // get new bitmap and find how to center it
    if (imgH == imgW) {
        // easy case of a square wallpaper
        if (screenH > screenW) {
            board = decodeSampledBitmapFromResource(getResources(), res,
                    screenW, screenW);
            verticalBitmapOffset = true;
            horizontalBitmapOffset = false;
            topOffset = (screenH - board.getHeight()) / 2;
        } else {
            board = decodeSampledBitmapFromResource(getResources(), res,
                    screenH, screenH);
            horizontalBitmapOffset = true;
            verticalBitmapOffset = false;
            leftOffset = (screenW - board.getWidth()) / 2;
        }
    } else {
        // ratio is now involved
    }
}

其余方法来自此处的 android 文档...

http://developer.android.com/training/displaying-bitmaps/load-bitmap.html

图像几乎完全缩放并居中，垂直居中，但它不是应有的全屏宽度。右边距有大约 25 px 的可用空间。

任何反馈都会很棒！

谢谢

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0 回答 0