android实现背景平铺的三种方法

时间:2021-09-22 18:37:22

方法1: 系统api实现

 

复制代码 代码如下:

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

 

复制代码 代码如下:

<bitmap xmlns:android="http://schemas.android.com/apk/res/android"  
    android:src="@drawable/img" 
    android:tileMode="repeat" /> 

 

方法3: 自定义绘制

 

复制代码 代码如下:

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; 
}