如何在Android应用程序中将文本字段（用户输入）数据保存在文本文件中

我希望我在应用程序的编辑文本字段中写的任何内容都能自动保存在.txt文件中。这样我就可以直接从那里检索这个文件，并通过一个按钮发送给任何人。

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我的问题是如何直接以.txt格式保存。

只需获取您的

EditText

的内容并将其保存到文件中即可。Google提供了一个。

当文本被更改时，此代码段将把文本复制成字符串，并调用函数写入应用程序的私有文件目录

String YourTextString;    
    YourTextField.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {
                YourTextString = YourTextField.getText().toString();
                writeToFile(YourTextString);
            }
            @Override
            public void afterTextChanged(Editable s) {      
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,int after) {         
            }
        });
public void writeToFile(String data) {
    try {
        OutputStreamWriter MyOutputStreamWriter = new OutputStreamWriter(mContext.openFileOutput("YourFileName.txt", Context.MODE_PRIVATE));
        MyOutputStreamWriter.append(data);
        MyOutputStreamWriter.close();
    }
    catch (IOException e) {
        Log.e("Exception", "File write failed: " + e.toString());
    } 
}

编辑： 如果要从文件中读取，可以使用此函数（如果path参数为空，代码将从private files目录中读取文件，如果为其指定路径，代码将读取指定的文件）：

public String readFromFile(String path) {
    String ret = "";
    if(path==""){
        try {
            InputStream inputStream = mContext.openFileInput(FileName);

            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).append("\n");
                }

                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());
        }
    }
    else
    {
        File file = new File(path);
        String receiveString = "";
        StringBuilder stringBuilder = new StringBuilder();
        try {
            BufferedReader buf = new BufferedReader(new FileReader(file));
            while ( (receiveString = buf.readLine()) != null ) {
                stringBuilder.append(receiveString).append("\n");
            }
            buf.close();
            ret = stringBuilder.toString();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return ret;
}