LayoutConfig config = new LayoutConfig(LayoutConfig.MATCH_PARENT, LayoutConfig.MATCH_PARENT);
myLayout.setLayoutConfig(config);
myLayout.setOrientation(Component.VERTICAL);
ShapeElement element = new ShapeElement();
element.setRgbColor(new RgbColor(255, 255, 255));
myLayout.setBackground(element);
log = createText("日志信息");
myLayout.addComponent(log);
writeBtn = createBtn("寫(xiě)入preferences數(shù)據(jù)", new RgbColor(0, 0, 255), 1002);
readBtn = createBtn("讀取preferences數(shù)據(jù)", new RgbColor(0, 0, 255), 1003);
addObserver = createBtn("注冊(cè)觀察者", new RgbColor(255, 0, 0), 1004);

private Text createText(String title) {
Text text = new Text(this);
DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(DirectionalLayout.LayoutConfig.MATCH_CONTENT, DirectionalLayout.LayoutConfig.MATCH_CONTENT);
text.setLayoutConfig(config);
text.setText(title);
text.setTextSize(48);
text.setTextColor(new Color(0xFF0000FF));
return text;
}

private Button createBtn(String title, RgbColor color, int id) {
Button btn = new Button(this);
LayoutConfig configBtn = new LayoutConfig(500, 100);
configBtn.topMargin = 30;
btn.setLayoutConfig(configBtn);
btn.setText(title);
btn.setId(id);
btn.setTextSize(48);
btn.setTextColor(new Color(0xFFFFFFFF));
ShapeElement elementBtn = new ShapeElement();
elementBtn.setRgbColor(color);
elementBtn.setCornerRadius(12);
btn.setBackground(elementBtn);
myLayout.addComponent(btn);
return btn;
}

private void initPreferences() {
DatabaseHelper databaseHelper = new DatabaseHelper(this);
String fileName = "user_info";
preferences = databaseHelper.getPreferences(fileName);
}

preferences.putInt("age", Integer.parseInt(age.getText()));
preferences.putString("name", name.getText());
preferences.flushSync();

int age = preferences.getInt("age", 0);
String name = preferences.getString("name", "");
ToastDialog toastDialog = new ToastDialog(PreferencesAbilitySlice.this);
toastDialog.setText("read user data frome preferences name:" + name + ", age:" + age);
toastDialog.show();

counter = new PreferencesChangeCounter();
preferences.registerObserver(counter);

private class PreferencesChangeCounter implements Preferences.PreferencesObserver {
 @Override
 public void onChange(Preferences preferences, String key) {
  if ("name".equals(key)) {
   String name = preferences.getString("name", "");
   log.setText("user data name is edit:" + name);
  }
  if ("age".equals(key)) {
   int age = preferences.getInt("age", 0);
   log.setText("user data age is edit:" + age);
  }
 }
}

preferences.unregisterObserver(counter);

private void addFocusChangedListener(Component view) {
 view.setFocusChangedListener(new Component.FocusChangedListener() {
  @Override
  public void onFocusChange(Component component, boolean b) {
   ShapeElement shapeElement = (ShapeElement) view.getBackgroundElement();
   if (b) {
    shapeElement.setStroke(10, new RgbColor(0, 0, 0));
    focusView = view;
   } else {
    shapeElement.setStroke(0, new RgbColor(0, 0, 0));
   }
  }
 });
}

@Override
public boolean onKeyUp(int keyCode, KeyEvent keyEvent) {
 switch (keyCode) {
  case KeyEvent.KEY_DPAD_CENTER:
  case KeyEvent.KEY_ENTER:
   if(focusView == writeBtn) {
    
    preferences.putInt("age", index++);
    preferences.putString("name", "張三");
    preferences.flushSync();
   }
   if(focusView == readBtn) {
    int age = preferences.getInt("age", 0);
    String name = preferences.getString("name", "");
    log.setText("read user data frome preferences name:" + name + ", age:" + age);
   }
   if(focusView == addObserver) {
    if (addObserver.getText().equals("注冊(cè)觀察者")) {
     addObserver.setText("刪除觀察者");
     // 向preferences實(shí)例注冊(cè)觀察者
     counter = new PreferencesChangeCounter();
     preferences.registerObserver(counter);

    } else {
     addObserver.setText("注冊(cè)觀察者");
     // 向preferences實(shí)例注銷(xiāo)觀察者
     preferences.unregisterObserver(counter);
    }
   }
   return true;
  case KeyEvent.KEY_DPAD_UP:
   int position = views.indexOf(focusView.getId());
   if (position > 0) {
    switch (position) {
     case 1:
      writeBtn.requestFocus();
      break;
     case 2:
      readBtn.requestFocus();
      break;
     default:
      break;
    }
   }
   return true;
  case KeyEvent.KEY_DPAD_DOWN:
   position = views.indexOf(focusView.getId());
   if (position < 3) {
    switch (position) {
     case 0:
      readBtn.requestFocus();
      break;
     case 1:
      addObserver.requestFocus();
      break;
     default:
      break;
    }
   }
   return true;
 }
 return false;
}

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