Android之获取SD卡总容量，可用大小，机身内存储器总容量及可用大小的系统方法

/**	 * 获得SD卡总大小	 * 	 * @return	 */	private String getSDTotalSize() {		File path = Environment.getExternalStorageDirectory();		StatFs stat = new StatFs(path.getPath());		long blockSize = stat.getBlockSize();		long totalBlocks = stat.getBlockCount();		return Formatter.formatFileSize(MainActivity.this, blockSize * totalBlocks);	}	/**	 * 获得sd卡剩余容量，即可用大小	 * 	 * @return	 */	private String getSDAvailableSize() {		File path = Environment.getExternalStorageDirectory();		StatFs stat = new StatFs(path.getPath());		long blockSize = stat.getBlockSize();		long availableBlocks = stat.getAvailableBlocks();		return Formatter.formatFileSize(MainActivity.this, blockSize * availableBlocks);	}	/**	 * 获得机身内存总大小	 * 	 * @return	 */	private String getRomTotalSize() {		File path = Environment.getDataDirectory();		StatFs stat = new StatFs(path.getPath());		long blockSize = stat.getBlockSize();		long totalBlocks = stat.getBlockCount();		return Formatter.formatFileSize(MainActivity.this, blockSize * totalBlocks);	}	/**	 * 获得机身可用内存	 * 	 * @return	 */	private String getRomAvailableSize() {		File path = Environment.getDataDirectory();		StatFs stat = new StatFs(path.getPath());		long blockSize = stat.getBlockSize();		long availableBlocks = stat.getAvailableBlocks();		return Formatter.formatFileSize(MainActivity.this, blockSize * availableBlocks);	}