Android 平铺背景图片

Android的图片平铺效果,主要有三种方法:1)系统API; 2)XML配置; 3)自定义绘制

方法1: 系统api实现

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pic);
//bitmap = Bitmap.createBitmap(100, 20, Config.ARGB_8888);
BitmapDrawable drawable = new BitmapDrawable(bitmap);
drawable.setTileModeXY(TileMode.REPEAT , TileMode.REPEAT );
drawable.setDither(true);
view.setBackgroundDrawable(drawable);

方法2: XML实现

xml路径:res/drawable/bg.xml


方法3: 自定义绘制

public static Bitmap createRepeater(int width, Bitmap src){
  int count = (width + src.getWidth() - 1) / src.getWidth();
  Bitmap bitmap = Bitmap.createBitmap(width, src.getHeight(), Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);

  for(int idx = 0; idx < count; ++ idx){
    canvas.drawBitmap(src, idx * src.getWidth(), 0, null);
  }

  return bitmap;
}

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