android获取设备存储信息

这是获取android设备的存储设备（手机内存，SD卡内存）信息的代码
import java.io.File;   import android.os.Environment;   import android.os.StatFs;     public class MemoryStatus {         static final int ERROR = -1;              static public boolean externalMemoryAvailable() {           return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);       }          /**        * 获取可用的内部记忆大小        * @return        */    static public long getAvailableInternalMemorySize() {           File path = Environment.getDataDirectory();           StatFs stat = new StatFs(path.getPath());           long blockSize = stat.getBlockSize();           long availableBlocks = stat.getAvailableBlocks();           return availableBlocks * blockSize;       }          /**        * 获取总共内部内存大小        * @return        */    static public long getTotalInternalMemorySize() {           File path = Environment.getDataDirectory();           StatFs stat = new StatFs(path.getPath());           long blockSize = stat.getBlockSize();           long totalBlocks = stat.getBlockCount();           return totalBlocks * blockSize;       }              /**     * 获取可用外部记忆大小     * @return     */    static public long getAvailableExternalMemorySize() {           if(externalMemoryAvailable()) {               File path = Environment.getExternalStorageDirectory();               StatFs stat = new StatFs(path.getPath());               long blockSize = stat.getBlockSize();               long availableBlocks = stat.getAvailableBlocks();               return availableBlocks * blockSize;           } else {               return ERROR;           }       }              /**     * 获取总共外部记忆大小     * @return     */    static public long getTotalExternalMemorySize() {           if(externalMemoryAvailable()) {               File path = Environment.getExternalStorageDirectory();               StatFs stat = new StatFs(path.getPath());               long blockSize = stat.getBlockSize();               long totalBlocks = stat.getBlockCount();               return totalBlocks * blockSize;           } else {               return ERROR;           }       }              static public String formatSize(long size) {           String suffix = null;                  if (size >= 1024) {               suffix = "KiB";               size /= 1024;               if (size >= 1024) {                   suffix = "MiB";                   size /= 1024;               }           }                  StringBuilder resultBuffer = new StringBuilder(Long.toString(size));                  int commaOffset = resultBuffer.length() - 3;           while (commaOffset > 0) {               resultBuffer.insert(commaOffset, ',');               commaOffset -= 3;           }                  if (suffix != null)               resultBuffer.append(suffix);           return resultBuffer.toString();       }   }
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