File path = Environment.getExternalStorageDirectory();
		File data = Environment.getDataDirectory();
		File cache = Environment.getDownloadCacheDirectory();
		File root = Environment.getRootDirectory();
		//StatFs对象 获取sd信息
		Log.i("MainActivity", "Storage--------------------");
		calc(path);
		Log.i("MainActivity", "Data--------------------");
		calc(data);
		Log.i("MainActivity", "Cache--------------------");
		calc(cache);
		Log.i("MainActivity", "Root--------------------");
		calc(root);
	}
	
	private void calc(File dir){
		jisuan(dir.getAbsolutePath());
	}

	@SuppressLint("NewApi")
	private void jisuan(String path) {
		StatFs stat = new StatFs(path);
		long size = stat.getBlockSizeLong(); //每块的大小
		long count = stat.getBlockCountLong(); //总块数
		long available = stat.getAvailableBlocksLong(); //可用块数
		Log.i("MainActivity", "count="+count);
		Log.i("MainActivity", "size="+size);
		Log.i("MainActivity", "available="+available);
		Log.i("MainActivity", "总共="+Formatter.formatFileSize(getApplicationContext(), (count*size)));
		Log.i("MainActivity", "可用="+Formatter.formatFileSize(getApplicationContext(), (available*size)));
	}