如何有效檢查SD卡是否存在且可寫入？

Question

我正在使用以下代碼來檢查Sd卡是否存在並且是Writable.But當我在模擬器的Sd卡上下文中使用該代碼時，它顯示Sd卡不存在於模擬器中，但實際上，文件資源管理器中顯示相應的Emulator.This的SD卡中的內容是代碼：

static public boolean hasStorage(boolean requireWriteAccess) { 
    //TODO: After fix the bug, add "if (VERBOSE)" before logging errors. 
    String state = Environment.getExternalStorageState(); 
    System.out.println("storage state is " + state); 

    if (Environment.MEDIA_MOUNTED.equals(state)) { 
     if (requireWriteAccess) { 
      boolean writable = checkFsWritable(); 
      System.out.println("storage writable is " + writable); 
      return writable; 
     } else { 
      return true; 
     } 
    } else if (!requireWriteAccess && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { 
     return true; 
    } 
    return false; 
} 

此代碼表明SD卡未安裝，但文件資源管理器中顯示不同picture.Please幫助我提前感謝。

Answer 1

這項工作將檢查兩個安裝，它是否可讀或不可讀。

private boolean isExternalStorageAvailable() { 

     String state = Environment.getExternalStorageState(); 
     boolean mExternalStorageAvailable = false; 
     boolean mExternalStorageWriteable = false; 

     if (Environment.MEDIA_MOUNTED.equals(state)) { 
      // We can read and write the media 
      mExternalStorageAvailable = mExternalStorageWriteable = true; 
     } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { 
      // We can only read the media 
      mExternalStorageAvailable = true; 
      mExternalStorageWriteable = false; 
     } else { 
      // Something else is wrong. It may be one of many other states, but 
      // all we need 
      // to know is we can neither read nor write 
      mExternalStorageAvailable = mExternalStorageWriteable = false; 
     } 

     if (mExternalStorageAvailable == true 
       && mExternalStorageWriteable == true) { 
      return true; 
     } else { 
      return false; 
     } 
    }