在SD卡被彈出後，MediaScanner在SD卡上運行？

Question

下面的代碼告訴我，MediaScanner在SD卡上啓動了，之後彈出爲什麼？發生了什麼？

if(intent.getDataString().equals("file:///mnt/extsd")) 
     { 
      if(Intent.ACTION_MEDIA_SCANNER_STARTED.equals(intent.getAction())) 
      { 
       //Media scanner is started 
      } 
      else if(Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(intent.getAction())) 
      { 
      } 
     } 

Answer 1

Probably this question will be helpfull其對/mnt/extsd以及如何正確使用SD卡（指Environment.getExternalStorageDirectory()）。你也必須檢查SD卡狀態。我的意思是這樣的：

boolean isExternalStorageWriteable = false, isExternalStorageReadable = false; 
// Check SD Card for Read/Write 
if (Environment.MEDIA_MOUNTED.equals(state)) { 
    // We can read and write the media 
    isExternalStorageWriteable = true; 
    isExternalStorageReadable = true; 
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { 
    // We can only read the media 
    isExternalStorageReadable = true; 
} 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 
}