小问题在DDMS数据文件夹

我是新来的机器人。所以我想实现一个code存储在设备的内部存储的数据。它被存储和加载数据。我看不到这是present在eclipse中的数据文件夹中的文件。当我点击的数据文件夹，它没有扩大。

I am new to android . So i was trying to implement a code which stores the data in the internal storage of the device. It is storing and loading the data. I cannot see the file in the data folder which is present in the eclipse. When i click the data folder , it is not expanding.

我用下面code

package com.example.files;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
    EditText textBox;
    static final int READ_BLOCK_SIZE = 100;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textBox = (EditText) findViewById(R.id.txtText1);
    }
    public void onClickSave(View view){
        String str = textBox.getText().toString();
        try
        {
            FileOutputStream fOut =
                    openFileOutput("textfile.txt",
                            MODE_WORLD_READABLE);
            OutputStreamWriter osw = new
                    OutputStreamWriter(fOut);
            //---write the string to the file---
            osw.write(str);
            osw.flush(); 
            osw.close();
            //---display file saved message---
            Toast.makeText(getBaseContext(),
                    "File saved successfully!",
                    Toast.LENGTH_SHORT).show();
            //---clears the EditText---
            textBox.setText("");
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace();
        }
    }
    public void onClickLoad(View view) {
        try
        {
            FileInputStream fIn = 
                    openFileInput("textfile.txt");
            InputStreamReader isr = new 
                    InputStreamReader(fIn);
            char[] inputBuffer = new char[READ_BLOCK_SIZE];
            String s = "";
            int charRead;
            while ((charRead = isr.read(inputBuffer))>0)
            {
                //---convert the chars to a String---
                String readString =
                        String.copyValueOf(inputBuffer, 0,
                                charRead);
                s += readString;
                inputBuffer = new char[READ_BLOCK_SIZE];
            }
            //---set the EditText to the text that has been 
            // read---
            textBox.setText(s);
            Toast.makeText(getBaseContext(),
                    "File loaded successfully!",
                    Toast.LENGTH_SHORT).show();
        }
        catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}