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

<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

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;  
}