Android实现获取SD卡总容量，可用大小，机身内存总容量及可用大小的方法

/** 
* 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); 
}