Android background背景图片平铺

xml方式：

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
        android:src="@mipmap/bg_flower"
        android:tileMode="repeat" />      

代码方式：

ImageView imageView = findViewById(R.id.iv_bg);  
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.bg_flower);  
BitmapDrawable bd = new BitmapDrawable(bitmap);  
bd.setTileModeXY(TileMode.REPEAT , TileMode.REPEAT ); 
imageView.setBackgroundDrawable(bd);