java - 将文件保存到 SD 卡

Question

.txt文件需要保存在SD卡中。

Save("n" + String.valueOf(key) + ".txt");

 private void Save(String FileName){
         File fileName = null;
         String sdState = android.os.Environment.getExternalStorageState();

         if (sdState.equals(android.os.Environment.MEDIA_MOUNTED)) {
             File sdDir = android.os.Environment.getExternalStorageDirectory();
             fileName = new File(sdDir, "FlyNote/"+FileName);
             } else {
                 fileName = context.getCacheDir();
             }
         if (!fileName.exists())
             fileName.mkdirs();
         try {
             FileWriter f = new FileWriter(fileName);
             f.write(editText2.getText().toString());
             f.flush();
             f.close();
         } catch (Exception e) {

         }
     }

但在SD卡中文件保存为一个文件夹。文件夹“n5.txt”和其他...

Answer 1

使用

File  dir= new File(sdDir.getAbsolutePath(), "FlyNote");
dir.mkdirs(); //CREATE DIR HERE
File  file = new File(dir, FileName);//CREATE FILE HERE

代替

fileName = new File(sdDir, "FlyNote/"+FileName);