Android 判断SD卡是否存在及容量查询

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Android 判断SD卡是否存在及容量查询的简单方法如下：
首先要在AndroidManifest.xml中增加SD卡访问权限

<!-- 在SDCard中创建与删除文件权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- 往SDCard写入数据权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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; }

SD卡剩余空间

 public long getSDFreeSize(){      //取得SD卡文件路径      File path = Environment.getExternalStorageDirectory();       StatFs sf = new StatFs(path.getPath());       //获取单个数据块的大小(Byte)      long blockSize = sf.getBlockSize();       //空闲的数据块的数量      long freeBlocks = sf.getAvailableBlocks();      //返回SD卡空闲大小      //return freeBlocks * blockSize;  //单位Byte      //return (freeBlocks * blockSize)/1024;   //单位KB      return (freeBlocks * blockSize)/1024 /1024; //单位MB    }

SD卡总容量

 public long getSDAllSize(){      //取得SD卡文件路径      File path = Environment.getExternalStorageDirectory();       StatFs sf = new StatFs(path.getPath());       //获取单个数据块的大小(Byte)      long blockSize = sf.getBlockSize();       //获取所有数据块数      long allBlocks = sf.getBlockCount();      //返回SD卡大小      //return allBlocks * blockSize; //单位Byte      //return (allBlocks * blockSize)/1024; //单位KB      return (allBlocks * blockSize)/1024/1024; //单位MB    }