Question

我正在Android应用中访问我片段中的文件。但我的问题是该文件只有1行被读取。

我的代码是：

FragmentTab2.java

package com.adhish.pagertabstriptutorial;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;

public class FragmentTab2 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Get the view from fragmenttab2.xml
        View v = inflater.inflate(R.layout.fragmenttab2, container, false);

        TextView txt = (TextView)v.findViewById(R.id.optext);

        try
        {
            FileInputStream fIn = getActivity().openFileInput("sample_details.txt");
            InputStreamReader in = new InputStreamReader(fIn);
            BufferedReader bufferedReader = new BufferedReader(in);
            //StringBuilder sb = new StringBuilder();

            String line =  null;
            String str = "";

            while ((line = bufferedReader.readLine()) != null) {
                str += line;
            }

            txt.setText(str);

            bufferedReader.close();
            in.close();
        }
        catch (Exception e)
        {
            Log.e("File not found.",e.toString());
        }

        return v;
    }

}

写入文件的代码（在不同的片段中）是：

@Override
    public void onClick(View view)
    {
        if(view == getView().findViewById(R.id.button1))
        {
            //Call all the elements of this Fragment here becuase they are accessible easily through
            //getView(); method. Use the getText(); method to get the Text and toString(); to convert
            //it.
            String name = ((EditText)getView().findViewById(R.id.name)).getText().toString();
            String email = ((EditText)getView().findViewById(R.id.email)).getText().toString();

            if(name.isEmpty() || email.isEmpty())
            {
                Toast.makeText(getActivity(), "Cannot store empty values !", Toast.LENGTH_SHORT).show();
            }
            else
            {
                try
                {
                    FileOutputStream fOut = getActivity().openFileOutput("sample_details.txt", Context.MODE_MULTI_PROCESS);
                    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fOut);

                    outputStreamWriter.write(name + " " + email + ";");
                    Log.e("String Concat Done", "Concatenation of the Strings is done to write in the File. Write Success.");
                    outputStreamWriter.flush();
                    Log.e("Flush","Flush Success");
                    outputStreamWriter.close();
                    fOut.close();
                    Log.e("Stream Closed","Both Streams are flushed and closed");

                    Toast.makeText(getActivity(), "Submitted", Toast.LENGTH_SHORT).show();
                }
                catch (Exception e)
                {
                    Toast.makeText(getActivity(), "FAILED !", Toast.LENGTH_SHORT).show();
                    Log.e("Error in File Write",e.toString());
                }
            }
        }
    }

我不知道实现这个的正确方法。请让我详细了解如何操作，因为我是Android新手。

感谢。

Answer 1

因为你的

FileOutputStream fOut = getActivity().openFileOutput("sample_details.txt", Context.MODE_MULTI_PROCESS);

应该是

openFileOutput(yourFile, Context.MODE_APPEND);

FileOutputStream还有一个构造函数，如果您没有要与Android openFileOutput()一起使用的上下文，则可以将其附加到原始文件。

类似问题的额外参考：OutputStreamWriter does not append

openFileInput只读1行

1 个答案: