Android项目ImageView展示assets目录下的图片变小？

1. try {  
2.     ImageView img=new ImageView(this.getActivity());  
3.     InputStream is = getActivity().getAssets().open(“file:///android_asset/1.png”);  
4.       
5.       
6.         Drawable drawable = Drawable.createFromStream(is, null);  
7.          
8.         img.setImageDrawable(drawable);  
9.         img.setScaleType(ScaleType.FIT_XY);  
10.         img.setAdjustViewBounds(true);  // 重点
11.          
12.         img.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));  
13.         layout.addView(img,new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));  
14.          
15.         CsLog.d(KEY_CONTENT, "addView img:\n"+imgUrl);  
16. } catch (IOException e) {  
17.     e.printStackTrace();  
18. }