如何从文件中检索特定的字符串？（安卓）

我正在创建一个Android应用程序，该应用程序记录五个EditText输入并将它们存储在一个文件中。我需要知道的是如何分别检索每个文件并将结果输出到另一个EditText字段。

MyExampleCode：

package chuck.com;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.app.Activity;
import android.content.Intent;

public class FillFile extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fill_file);





    Button submit = (Button) findViewById(R.id.button1);
    submit.setOnClickListener(sub);
    Button disp = (Button) findViewById(R.id.button2);
    disp.setOnClickListener(dis);
}
private OnClickListener sub = new OnClickListener(){
    public void onClick(View v){

        try {
            EditText one = (EditText) findViewById(R.id.editText1);
            EditText two = (EditText) findViewById(R.id.editText2);
            EditText three = (EditText) findViewById(R.id.editText3);
            EditText four = (EditText) findViewById(R.id.editText4);
            EditText five = (EditText) findViewById(R.id.editText5);

            FileOutputStream fos;
            fos = openFileOutput("XML.txt", MODE_APPEND);

            String uno = one.getText().toString();
            String dos = two.getText().toString();
            String tres = three.getText().toString();
            String quatro = four.getText().toString();
            String cinco = five.getText().toString();

            fos.write(uno.getBytes());
            fos.write(dos.getBytes());
            fos.write(tres.getBytes());
            fos.write(quatro.getBytes());
            fos.write(cinco.getBytes());

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
};
private OnClickListener dis = new OnClickListener(){
    public void onClick(View v){
        Intent transf = new Intent(v.getContext(), MainActivity.class);
        startActivityForResult(transf, 0);
    }
};
}

我要将文件导出到的xml布局：

 package chuck.com;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;

 import android.os.Bundle;
 import android.app.Activity;
 import android.content.Intent;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.TextView;

 public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    File fileDir = getFilesDir();
    String fileName = ("XML.txt");
    File backup = new File(fileDir, fileName);
    boolean content = backup.length() == 0;

    try {
        backup.createNewFile();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    TextView one = (TextView) findViewById(R.id.textView1);
    TextView two = (TextView) findViewById(R.id.textView2);
    TextView three = (TextView) findViewById(R.id.textView3);
    TextView four = (TextView) findViewById(R.id.textView4);
    TextView five = (TextView) findViewById(R.id.textView5);

    EditText eOne = (EditText) findViewById(R.id.editText1);
    EditText eTwo = (EditText) findViewById(R.id.editText2);
    EditText eThree = (EditText) findViewById(R.id.editText3);
    EditText eFour = (EditText) findViewById(R.id.editText4);

    Button input = (Button) findViewById(R.id.input_button);
    input.setOnClickListener(insert);
    if (content)
    {
        one.setVisibility(View.GONE);
        two.setVisibility(View.GONE);
        three.setVisibility(View.GONE);
        four.setVisibility(View.GONE);

        eOne.setVisibility(View.GONE);
        eTwo.setVisibility(View.GONE);
        eThree.setVisibility(View.GONE);
        eFour.setVisibility(View.GONE);
    }
    else
    {
        five.setVisibility(View.GONE);

        FileInputStream fis;
        fis = openFileInput("XML.txt");

        eOne.setText(uno);
        eTwo.setText(dos);
        eThree.setText(tres);
        eFour.setText(quatro, cinco);
    }
  }
  private OnClickListener insert = new OnClickListener(){
    public void onClick(View v) { 
        Intent trans = new Intent(v.getContext(), FillFile.class);
        startActivityForResult(trans, 0);
    }
};
  }