我希望我在应用程序的“编辑”文本字段中编写的所有内容都自动保存在.txt文件中。这样我就可以直接从那里检索此文件,并通过一个按钮将其发送给任何人。
我的问题是如何直接保存为.txt格式。

最佳答案

更改文本后,此代码段会将您的文本复制到字符串中,并调用一个函数来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:
如果要读取文件,则可以使用此功能(如果path参数为空,则代码将从私有文件目录中读取文件,如果提供路径,它将读取您指定的文件):

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;
}

关于android - 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,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/22734648/

10-12 00:22
查看更多