如何取得USB插入裝置的路徑

加好友 · 發表於 2016-1-27 14:54

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小弟最近在做一個功能,就是當Android裝置插上USB隨身碟後,

在我自己開發的程式裡面開啟USB隨身碟的資料,目前功能部份我是有做出來,

但在路徑上我是寫死的,我事先先用ES檔案管理器去看USB插上後的路徑再寫入程式中,

但是如果插上不同隨身碟的話,有的路徑會不相同導致讀取不到檔案,

想請問一下大大有人知道如何取得正確路徑嗎?

加好友 · 發表於 2016-2-16 16:56

謝謝分享研究研究 :)

加好友 · 發表於 2016-4-24 22:02

之前看過幾個解法
http://stackoverflow.com/questions/11281010/how-can-i-get-external-sd-card-path-for-android-4-0

private static final Pattern DIR_SEPORATOR = Pattern.compile("/");

/**
* Raturns all available SD-Cards in the system (include emulated)
*
* Warning: Hack! Based on Android source code of version 4.3 (API 18)
* Because there is no standart way to get it.
* TODO: Test on future Android versions 4.4+
*
* @return paths to all available SD-Cards in the system (include emulated)
*/
public static String[] getStorageDirectories()
{
// Final set of paths
final Set<String> rv = new HashSet<String>();
// Primary physical SD-CARD (not emulated)
final String rawExternalStorage = System.getenv("EXTERNAL_STORAGE");
// All Secondary SD-CARDs (all exclude primary) separated by ":"
final String rawSecondaryStoragesStr = System.getenv("SECONDARY_STORAGE");
// Primary emulated SD-CARD
final String rawEmulatedStorageTarget = System.getenv("EMULATED_STORAGE_TARGET");
if(TextUtils.isEmpty(rawEmulatedStorageTarget))
{
      // Device has physical external storage; use plain paths.
      if(TextUtils.isEmpty(rawExternalStorage))
      {
         // EXTERNAL_STORAGE undefined; falling back to default.
         rv.add("/storage/sdcard0");
      }
      else
      {
         rv.add(rawExternalStorage);
      }
}
else
{
      // Device has emulated storage; external storage paths should have
      // userId burned into them.
      final String rawUserId;
      if(Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1)
      {
         rawUserId = "";
      }
      else
      {
         final String path = Environment.getExternalStorageDirectory().getAbsolutePath();
         final String[] folders = DIR_SEPORATOR.split(path);
         final String lastFolder = folders[folders.length - 1];
         boolean isDigit = false;
         try
         {
            Integer.valueOf(lastFolder);
            isDigit = true;
         }
         catch(NumberFormatException ignored)
         {
         }
         rawUserId = isDigit ? lastFolder : "";
      }
      // /storage/emulated/0[1,2,...]
      if(TextUtils.isEmpty(rawUserId))
      {
         rv.add(rawEmulatedStorageTarget);
      }
      else
      {
         rv.add(rawEmulatedStorageTarget + File.separator + rawUserId);
      }
}
// Add all secondary storages
if(!TextUtils.isEmpty(rawSecondaryStoragesStr))
{
      // All Secondary SD-CARDs splited into array
      final String[] rawSecondaryStorages = rawSecondaryStoragesStr.split(File.pathSeparator);
      Collections.addAll(rv, rawSecondaryStorages);
}
return rv.toArray(new String[rv.size()]);
}

[求助] 如何取得USB插入裝置的路徑

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