自定义字符串标签
在values下面创建文件，values/speed_strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="txt_1" type="speed_string">http://speed_string.com</item>
</resources>
代码中使用

  Log.d("", getResources().getString(R.urls.myUrl));

读取assets文件下图片

  private Bitmap getImageFromAssetsFile(String fileName)  {  
      Bitmap image = null;  
      AssetManager am = getResources().getAssets();  
      try  {  
          InputStream is = am.open(fileName);  
          image = BitmapFactory.decodeStream(is);  
          is.close();  
      }  catch (Exception e)  {  
          e.printStackTrace();  
      }  
    return image;  
 }  

  //图片过大时可能会内存溢出,使用BitmapFactory.Options
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inJustDecodeBounds = true;         //读取图片的轮廓
  Bitmap bmp = BitmapFactory.decodeFile(path, options);/* 这里返回的bmp是null */

  options.inSampleSize = options.outWidth / 200; //图片长宽方向缩小倍数
  
  Bitmap bmp = BitmapFactory.decodeFile(path, options);

  options.inDither=false; //不进行图片抖动处理
  options.inPreferredConfig=null; //设置让解码器以最佳方式解码

  //下面两个字段需要组合使用 
  options.inPurgeable = true;
  options.inInputShareable = true;