android - 获取平铺位图/重复位图

Question

我有一个无缝背景，我已经成功地使用下面的代码在屏幕上反复显示它:

BitmapDrawable bitmapDrawable = new BitmapDrawable(getResources(), bitmap);
bitmapDrawable.setTileModeX(Shader.TileMode.REPEAT);
bitmapDrawable.setTileModeY(Shader.TileMode.REPEAT);
mBackground.setBackground(bitmapDrawable);

但是，我在稍后保存位图时遇到了问题。背景在宽度和高度上与屏幕尺寸相匹配。当我尝试使用以下代码获取位图时，保存的图像只是原始的无缝图案。

((BitmapDrawable) mBackground.getBackground()).getBitmap()

我不知道如何生成重复的背景图像。

Answer 1

这段代码可能有帮助:

    int width = 100;//initialise
    int height= 100;//initialise

    //you say "The background is matched screen size in the question"
    width  = mBackground.getWidth();//  get width  of screen
    height = mBackground.getHeight();// get height of screen

    //Create bitmap for canvas        
    Bitmap tiledBitmap = Bitmap.createBitmap( width , height, Bitmap.Config.ARGB_8888 );//create a Bipmap for us to save later
    canvas = new Canvas( tiledBitmap );//associate bitmap to canvas

    bitmapDrawable.setBounds( 0, 0, width , height );//set bounds
    bitmapDrawable.draw( canvas );//draw tiled image to canvas ( and so Bitmap )

    //tiledBitmap now contains your tiled image