可能有的同学不知道系统已经提供了获取获取SD卡总容量，可用大小，机身内存总容量及可用大小的系统方法，用系统源代码提供的方法可以很简单，方便的获取其大小。这里我把系统源代码中的一个方法贴出来，供大家参考一下：

图片上

图片上红色方框中的代码就是源代码中获取SD卡大小的程序方法。

在这里我整理了一下，我把我整理封装好的方法给大家贴出来：

/*** 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);}

转载请说明出处。

来源：http://blog.csdn.net/loongggdroid/article/details/12304695