Android 判斷SD卡是否存在及容量查詢

Android 判斷SD卡是否存在及容量查詢的簡單方法如下：

 

首先要在AndroidManifest.xml中增加SD卡訪問權限

 

<!-- 在SDCard中創建與刪除文件權限 -->  
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  
<!-- 往SDCard寫入數據權限 -->  
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 

判斷SD卡是否存在

private boolean ExistSDCard() {  
  if (android.os.Environment.getExternalStorageState().equals(  
    android.os.Environment.MEDIA_MOUNTED)) {  
   return true;  
  } else  
   return false;  
 }  

查看SD卡的剩余空間

public long getSDFreeSize(){  
     //取得SD卡文件路徑  
     File path = Environment.getExternalStorageDirectory();   
     StatFs sf = new StatFs(path.getPath());   
     //獲取單個數據塊的大小(Byte)  
     long blockSize = sf.getBlockSize();   
     //空閑的數據塊的數量  
     long freeBlocks = sf.getAvailableBlocks();  
     //返回SD卡空閑大小  
     //return freeBlocks * blockSize;  //單位Byte  
     //return (freeBlocks * blockSize)/1024;   //單位KB  
     return (freeBlocks * blockSize)/1024 /1024; //單位MB  
   }      

查看SD卡總容量

 public long getSDAllSize(){
      //取得SD卡文件路徑
      File path = Environment.getExternalStorageDirectory(); 
      StatFs sf = new StatFs(path.getPath()); 
      //獲取單個數據塊的大小(Byte)
      long blockSize = sf.getBlockSize(); 
      //獲取所有數據塊數
      long allBlocks = sf.getBlockCount();
      //返回SD卡大小
      //return allBlocks * blockSize; //單位Byte
      //return (allBlocks * blockSize)/1024; //單位KB
      return (allBlocks * blockSize)/1024/1024; //單位MB
    }