Android Studio 将数据保存到手机

Posted 2023-05-07

【中文标题】Android Studio 将数据保存到手机

【英文标题】：Android Studio Saving Data to Phone

【发布时间】：2015-03-21 03:32:46

【问题描述】：

String myString = "hello world";

如何将myString 的内容保存到Phone/android 中的.txt 文件中，该文件将在应用程序结束后存在，以便我以后可以编辑该值？

【问题讨论】：

你经历过all these吗？

How to write to an external text file in Android?的可能重复

为什么Android studio这个词有问题？问题似乎与应用程序和 Android 设备/手机有关......

【参考方案1】：

使用这个方法：

public void WriteToFile(String str)
    try 
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("config.txt", Context.MODE_PRIVATE));
            outputStreamWriter.write(data);
            outputStreamWriter.close();
        
        catch (IOException e) 
            Log.e("Exception", "File write failed: " + e.toString());
        
private String readFromFile() 

    String ret = "";

    try 
        InputStream inputStream = openFileInput("config.txt");

        if ( inputStream != null ) 
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) 
                stringBuilder.append(receiveString);
            

            inputStream.close();
            ret = stringBuilder.toString();
        
    
    catch (FileNotFoundException e) 
        Log.e("login activity", "File not found: " + e.toString());
     catch (IOException e) 
        Log.e("login activity", "Can not read file: " + e.toString());
    

    return ret;