String FILE_NAME = "tempfile.tmp";

                try {

                    //读

                    FileInputStream fis = openFileInput(FILE_NAME);

                    InputStreamReader isr = new InputStreamReader(fis, "UTF-8");

                    BufferedReader br = new BufferedReader(isr);

                    StringBuffer sb = new StringBuffer();

                    while (br.readLine() != null) {

                        sb.append(br.readLine()+"\n");

                    }

                    System.out.println(sb.toString());

                    //写

                    FileOutputStream fos = openFileOutput(FILE_NAME, Context.MODE_PRIVATE);//要让其它应用组件也能访问则用MODE_WORLD_WRITEABLE

                    File file = new File(FILE_NAME);

                    if (!file.exists()) {

                        byte[] os = "write file".getBytes("UTF-8");//"这个例子测试文件写".getBytes("GB2312");

                        fos.write(os);

                    }

                } catch (FileNotFoundException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                } catch (UnsupportedEncodingException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

//这个id是在gen的R.java中生成id. 项目层次结构为res/raw里

                    InputStream is = getResources().openRawResource(R.raw.info);

                    InputStreamReader isr;

                    isr = new InputStreamReader(is, "UTF-8");

                    BufferedReader bfr = new BufferedReader(isr);

                    String inString = "";

                    while ((inString = bfr.readLine()) != null) {

                        Log.i(TAG, inString);

                    }

int minimumMagnitude = 0;

boolean autoUpdate = false;

int updateFreq = 0;

//读

Context context = getApplicationContext();

      SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);

      minimumMagnitude = Integer.parseInt(prefs.getString(Preferences.PREF_MIN_MAG, "0"));

      updateFreq = Integer.parseInt(prefs.getString(Preferences.PREF_UPDATE_FREQ, "0"));

      autoUpdate = prefs.getBoolean(Preferences.PREF_AUTO_UPDATE, false);

//写

Context context = getApplicationContext();

    prefs = PreferenceManager.getDefaultSharedPreferences(context);

Editor editor = prefs.edit();

    editor.putBoolean(PREF_AUTO_UPDATE, autoUpdateChecked);

    editor.putInt(PREF_UPDATE_FREQ, updateIndex);

    editor.putInt(PREF_MIN_MAG, minMagIndex);

    editor.commit(); 

@res/xml/userpreferences.xml

<?xml version="1.0" encoding="utf-8"?>

<PreferenceScreen

  xmlns:android="http://schemas.android.com/apk/res/android">

  <CheckBoxPreference

    android:key="PREF_AUTO_UPDATE"

    android:title="Auto refresh"

    android:summary="Select to turn on automatic updating"

    android:defaultValue="true"

  />

  <ListPreference

   android:key="PREF_UPDATE_FREQ"

   android:title="Refresh frequency"

   android:summary="Frequency at which to refresh earthquake list"

   android:entries="@array/update_freq_options"

   android:entryValues="@array/update_freq_values"

   android:dialogTitle="Refresh frequency"

   android:defaultValue="60"

  />

  <ListPreference

    android:key="PREF_MIN_MAG"

    android:title="Minimum magnitude"

    android:summary="Select the minimum magnitude earthquake to report"

    android:entries="@array/magnitude_options"

    android:entryValues="@array/magnitude"

    android:dialogTitle="Magnitude"

    android:defaultValue="3"

  />

</PreferenceScreen>

@PreferencesActivity

public void onCreate(Bundle icicle) {

    super.onCreate(icicle);

    addPreferencesFromResource(R.xml.userpreferences);

  } 

@Activity

public void onCreate(Bundle icicle) {

    Context context = getApplicationContext();

    SharedPreferences prefs =  PreferenceManager.getDefaultSharedPreferences(context);

    prefs.registerOnSharedPreferenceChangeListener(this);

  } 

public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {

}

private ListView myListView;

private EditText myEditText;

private static final String TEXT_ENTRY_KEY = "TEXT_ENTRY_KEY";

private static final String ADDING_ITEM_KEY = "ADDING_ITEM_KEY";

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    // Inflate your view

    setContentView(R.layout.main);

    // Get references to UI widgets

    myListView = (ListView)findViewById(R.id.myListView);

    myEditText = (EditText)findViewById(R.id.myEditText);

    restoreUIState();

  }

private void restoreUIState() {

    // Get the activity preferences object.

    SharedPreferences settings = getPreferences(0);

    // Read the UI state values, specifying default values.

    String text = settings.getString(TEXT_ENTRY_KEY, "");

    Boolean adding = settings.getBoolean(ADDING_ITEM_KEY, false);

    // Restore the UI to the previous state.

    if (adding) {

      addNewItem();

      myEditText.setText(text);

    }

  }

@Override

  protected void onPause() {

    super.onPause();

    // Get the activity preferences object.

    SharedPreferences uiState = getPreferences(0);

    // Get the preferences editor.

    SharedPreferences.Editor editor = uiState.edit();

    // Add the UI state preference values.

    editor.putString(TEXT_ENTRY_KEY, myEditText.getText().toString());

    editor.putBoolean(ADDING_ITEM_KEY, addingNew);

    // Commit the preferences.

    editor.commit();

  }

private static final String SELECTED_INDEX_KEY = "SELECTED_INDEX_KEY";

@Override

  public void onSaveInstanceState(Bundle outState) {

    outState.putInt(SELECTED_INDEX_KEY, myListView.getSelectedItemPosition());

    super.onSaveInstanceState(outState);

  }

  @Override

  public void onRestoreInstanceState(Bundle savedInstanceState) {

    int pos = -1;

    if (savedInstanceState != null)

      if (savedInstanceState.containsKey(SELECTED_INDEX_KEY))

        pos = savedInstanceState.getInt(SELECTED_INDEX_KEY, -1);

    myListView.setSelection(pos);

  }