Android Java读取和保存数据不起作用

嘿，我想保存数据，然后我想阅读它们并将它们放在编辑文本中

    speichern.setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v) {
        save();
        tv.setText("gespeichert");

        }

    });

private  void save() {
    try {
        File myFile = new File("bla.txt");
        myFile.createNewFile();
        FileOutputStream fOut = new FileOutputStream(myFile);
        OutputStreamWriter myOutWriter = 
                                new    OutputStreamWriter(fOut);
        myOutWriter.append(string.toString() + "\n");
        myOutWriter.append(string2.toString());

        myOutWriter.close();
        fOut.close();
        Toast.makeText(getBaseContext(),
                "Gespeichert",
                Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        Toast.makeText(getBaseContext(), e.getMessage(),
                Toast.LENGTH_SHORT).show();
    }
}

我能换什么` 请帮帮我 我正在使用eclipse

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并且我希望将.txt文件保护为非外部文件。

我认为您创建的文件不正确：

File file = new File("test.txt");
file.createNewFile();

if(file.exists())
{
     OutputStream fo = new FileOutputStream(file);              
     fo.write("Hello World");
     fo.close();
     System.out.println("file created: "+file);
     url = upload.upload(file);
}

要读取此文件，请执行以下操作：

 try {
    // open the file for reading
    InputStream instream = openFileInput("test.txt");


// if file the available for reading
if (instream) {
  // prepare the file for reading
  InputStreamReader inputreader = new InputStreamReader(instream);
  BufferedReader buffreader = new BufferedReader(inputreader);

  String line;

  // read every line of the file into the line-variable, on line at the time
  while (( line = buffreader.readLine())) {
    // do something with the settings from the file
  }

}

// close the file again      
instream.close();
  } catch (java.io.FileNotFoundException e) {
    // do something if the myfilename.txt does not exits
  }

不要忘记用

try catch

块封装代码，以捕获从这些对象抛出的

IOException

编辑

将此添加到清单文件：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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希望有帮助！：）

你有什么错误吗？如果是，您能提供stacktrace吗？：）当我按下load时，我得到了android.content.res.Resources$NotFoundException:String resource ID#0x0

private void read（）{try{File myFile=new File（“bla.txt”）；FileInputStream fIn=new FileInputStream（myFile）；BufferedReader myReader=new BufferedReader（new InputStreamReader（fIn））；for（int i=0；i@user3722368在阅读之前，您正在创建一个新文件。我可以将我的完整项目发送给您并修复它吗？@user3722368我将无法为您完成此操作：（抱歉…但是此链接可能可以帮助您哦，我重新启动模拟器，现在我可以保护数据了：）谢谢：）
 try {
    // open the file for reading
    InputStream instream = openFileInput("test.txt");


// if file the available for reading
if (instream) {
  // prepare the file for reading
  InputStreamReader inputreader = new InputStreamReader(instream);
  BufferedReader buffreader = new BufferedReader(inputreader);

  String line;

  // read every line of the file into the line-variable, on line at the time
  while (( line = buffreader.readLine())) {
    // do something with the settings from the file
  }

}

// close the file again      
instream.close();
  } catch (java.io.FileNotFoundException e) {
    // do something if the myfilename.txt does not exits
  }

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

File filesDir = getFilesDir();
Scanner input = new Scanner(new File(filesDir, filename));