getAssets（）。打開 - 打開失敗：EROFS（只讀文件系統）

Question

我試圖從資產文件夾中將文件複製到應用程序的數據目錄/內部存儲。

該文件保存在資產文件夾中，文件名爲eng.traineddata。

這裏是我正在使用的代碼：

File file = new File(getFilesDir(), "eng.traineddata"); 
    if (!file.exists()) { 
     try { 
      InputStream inputStream = getAssets().open("eng.traineddata"); 
      OutputStream outputStream = new FileOutputStream("eng.traineddata"); 
      byte[] buffer = new byte[5120]; 
      int length = inputStream.read(buffer); 
      while (length > 0) { 
       outputStream.write(buffer, 0, length); 
       length = inputStream.read(buffer); 
      } 
      outputStream.flush(); 
      outputStream.close(); 
      inputStream.close(); 
     } catch (IOException e) { 
      Log.e("APP_INITIALIZER", e.getMessage()); 
     } 
    } 

但我總是在logcat的這條消息：eng.traineddata: open failed: EROFS (Read-only file system)

Answer 1

創建OutputStream這樣的：

OutputStream outputStream = new FileOutputStream(file); 

Answer 2

嘗試此代碼：

PackageManager m = getPackageManager(); 
    PackageInfo p = m.getPackageInfo(getPackageName();, 0); 
    String dataDir = p.applicationInfo.dataDir; 

    OutputStream outputStream = new FileOutputStream(dataDir +"/eng.traineddata");