获取内存状态

//获取内存状态
	public String getMemoryInfo(File path){
		//获取磁盘状态对象
		StatFs stat = new StatFs(path.getPath());
		//扇区的大小
		long blockSize = stat.getBlockSize();
		//有多少扇区
		long totalBlocks = stat.getBlockCount();
		//有多少可用扇区
		long availableBlocks = stat.getAvailableBlocks();
		
		//总空间
		String totalMemory = Formatter.formatFileSize(this, totalBlocks*blockSize);
		
		//可用空间大小
		String availableMemory = Formatter.formatFileSize(this, availableBlocks*blockSize);
		
		return "总空间: " + totalMemory + "\t\n" + "可用空间:" + availableMemory;
	}