无法在Eclipse Android中保存文件

Question

我一直在尝试保存基本文本文件，然后从文本文件中读取作业。老师没有反应，所以没有意义问他，但我认为你们可能知道一个解决方案。

这是我撰写的源代码：

public class MainActivity extends ActionBarActivity {

final String fileName = "StorageFile.txt";
FileOutputStream outputStream;
FileInputStream inputStream;

public void saveTheFile(View view)
{
    try
    {
        EditText textToSave = (EditText) findViewById(R.id.saveText);           
        outputStream = openFileOutput(fileName, Context.MODE_PRIVATE);
        outputStream.write(textToSave.toString().getBytes());
        outputStream.close();

        Context context = getApplicationContext();
        CharSequence text = "File Saved!";
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

public void readTheFile(View view)
{
    try
    {
        InputStream instream = openFileInput(fileName);

        if(instream != null)
        {
            InputStreamReader inputReader = new InputStreamReader(instream);
            BufferedReader buffReader = new BufferedReader(inputReader);

            String text;
            // This part is for reading multiple lines, just in case.
            do 
            {
                text = buffReader.readLine();
            } while(text != null);      

            EditText readText = (EditText)findViewById(R.id.readText);
            readText.setText(text, TextView.BufferType.EDITABLE);
        }
        instream.close();

        Context context = getApplicationContext();
        CharSequence text = "File Read!";
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    // Sets the text on the buttons programatically, since no @string was
    // referenced in the XML file.
    Button buttonSave = (Button) findViewById(R.id.saveFile);
    buttonSave.setText("Save File");
    Button buttonRead = (Button) findViewById(R.id.readFile);
    buttonRead.setText("Read File");

}`

这是XML文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context="com.example.androidui.MainActivity" >

<EditText
android:id="@+id/saveText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="text" >
<requestFocus />
</EditText>

<Button
android:id="@+id/saveFile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_below="@+id/saveText"
android:minHeight="36dip"
android:onClick="saveTheFile" />

<Button
android:id="@+id/readFile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_below="@+id/saveFile"
android:minHeight="36dip"
android:onClick="readTheFile" />

<EditText
android:id="@+id/readText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/readFile"
android:inputType="text" />

</RelativeLayout>

我真的迷失在这里。我无法找到任何已保存在我的任何驱动器上的任何文件夹中的文件。从初学者的角度来看，这是非常令人沮丧的。