<!-- 在SDCard 的掛載權(quán)限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 往SDCard寫入數(shù)據(jù)權(quán)限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

import java.io.File; 
import android.os.Environment; 
import android.os.StatFs; 
public class SDTool { 
  private static SDTool tool = null; 
  // 檢查SD卡是否掛載 
  public boolean SD_EXIST = false; 
  private SDTool() { 
  } 
  public static SDTool instance() { 
    if (tool == null) { 
      synchronized (SDTool.class) { 
        if (tool == null) { 
          tool = new SDTool(); 
          tool.SD_EXIST = Environment.MEDIA_MOUNTED 
              .equals(Environment.getExternalStorageState()); 
        } 
      } 
    } 
    return tool; 
  } 
  public long getSDFreeSize() { 
    // 取得SD卡文件路徑 
    File path = Environment.getExternalStorageDirectory(); 
    StatFs sf = new StatFs(path.getPath()); 
    long blockSize = sf.getBlockSize(); 
    // 空閑的數(shù)據(jù)塊的數(shù)量 
    long freeBlocks = sf.getAvailableBlocks(); 
    // 返回SD卡空閑大小 
    return freeBlocks * blockSize; // 單位Byte 
  } 
  public long getSDAllSize() { 
    // 取得SD卡文件路徑 
    File path = Environment.getExternalStorageDirectory(); 
    StatFs sf = new StatFs(path.getPath()); 
    // 獲取單個數(shù)據(jù)塊的大小(Byte) 
    long blockSize = sf.getBlockSize(); 
    // 獲取所有數(shù)據(jù)塊數(shù) 
    long allBlocks = sf.getBlockCount(); 
    // 返回SD卡大小 
    return allBlocks * blockSize; // 單位Byte 
  } 
}