SD卡相關輔助類 SDCardUtils

import java.io.File;

import android.os.Environment;

import android.os.StatFs;
/**

SD卡相關的輔助類 


*/

public class SDCardUtils

{

private SDCardUtils()

{

/* cannot be instantiated */  
throw new UnsupportedOperationException("cannot be instantiated");  

}
/**

判斷SDCard是否可用 

@return 
*/

public static boolean isSDCardEnable()

{

 return Environment.getExternalStorageState().equals(  
     Environment.MEDIA_MOUNTED);  


}
/**

獲取SD卡路徑 

@return 
*/

public static String getSDCardPath()

{

 return Environment.getExternalStorageDirectory().getAbsolutePath()  
     + File.separator;  

}  

/**

獲取SD卡的剩余容量 單位byte 

@return 
*/

public static long getSDCardAllSize()

{

 if (isSDCardEnable())

 {  
 StatFs stat = new StatFs(getSDCardPath());  
 // 獲取空閑的數據塊的數量  
 long availableBlocks = (long) stat.getAvailableBlocks() - 4;  
 // 獲取單個數據塊的大小（byte）  
 long freeBlocks = stat.getAvailableBlocks();  
 return freeBlocks * availableBlocks;  

 }

 return 0;

}  

/**

獲取指定路徑所在空間的剩余可用容量字節數，單位byte 

@param filePath 
@return 容量字節 SDCard可用空間，內部存儲可用空間 
*/

public static long getFreeBytes(String filePath)

{

 // 如果是sd卡的下的路徑，則獲取sd卡可用容量

 if (filePath.startsWith(getSDCardPath()))

 {  
 filePath = getSDCardPath();  

 } else

 {// 如果是內部存儲的路徑，則獲取內存存儲的可用容量  
 filePath = Environment.getDataDirectory().getAbsolutePath();  

 }

 StatFs stat = new StatFs(filePath);

 long availableBlocks = (long) stat.getAvailableBlocks() - 4;

 return stat.getBlockSize() * availableBlocks;

}  

/**

獲取系統存儲路徑 

@return 
*/

public static String getRootDirectoryPath()

{

 return Environment.getRootDirectory().getAbsolutePath();

}  



}  </pre>