获取data目录剩余存储空间大小，并格式化字符串

//格式化
public static String formatM(long length){
		 String  show = "";
		 int sub_index = 0;
	if(length>=1073741824){
            sub_index = (String.valueOf((float)length/1073741824)).indexOf(".");
            show = ((float)length/1073741824+"000").substring(0,sub_index+3)+"GB";
          }else if(length>=1048576){
            sub_index = (String.valueOf((float)length/1048576)).indexOf(".");
            show =((float)length/1048576+"000").substring(0,sub_index+3)+"MB";
          }else if(length>=1024){
            sub_index = (String.valueOf((float)length/1024)).indexOf(".");
            show = ((float)length/1024+"000").substring(0,sub_index+3)+"KB";
          }else if(length<1024){
            show = String.valueOf(length)+"B";
          }
		
		return show;
	}
	

        String path = "/data";
        StatFs fileStats = new StatFs(path); 
        fileStats.restat(path)；
 long restM = fileStats.getAvailableBlocks() * fileStats.getBlockSize(); //获取剩余空间 

formatM(restM); //格式化如返回： 2MB 或200KB 等类似的字符串

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