java onDateChanged和onCheckedChanged一起工作

Question

在一个活动中，我有一个日期选择器（微调器），允许用户选择他们的出生日期，在该日期下方，用户还必须选择他们的性别。我有一个按钮，一旦两个值都设置好（日期和性别），它就会被启用。我面临的问题是启用该按钮，不管先更改哪个值。目前，用户必须先选择出生日期，然后选择性别，按钮才能激活。我希望无论先更改哪个值，都能启用该按钮

这是我的密码：

final RadioGroup rGroup = findViewById(R.id.gender_radio_group);
RadioButton female_radio_button = rGroup.findViewById(rGroup.getCheckedRadioButtonId());
RadioButton male_radio_button = rGroup.findViewById(rGroup.getCheckedRadioButtonId());
RadioButton non_binary_radio_button = rGroup.findViewById(rGroup.getCheckedRadioButtonId());

//Check if datePicker and gender radiobutton has been used, if true enable button
calendar.setTimeInMillis(System.currentTimeMillis());
datePicker_birthday.init(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),
  calendar.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {

    @Override
    public void onDateChanged(DatePicker datePicker, int year, int month, int dayOfMonth) {

      // This overrides the radiogroup onCheckListener
      rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        public void onCheckedChanged(RadioGroup group, int checkedId) {
          // This will get the radiobutton that has changed in its check state
          RadioButton checkedRadioButton = group.findViewById(checkedId);
          // This puts the value (true/false) into the variable
          boolean isChecked = checkedRadioButton.isChecked();
          // If the radiobutton that has changed in check state is now checked...
          if (isChecked) {
            continue_register_birthday_gender_button.setEnabled(true);
            continue_register_birthday_gender_button.setBackground(ContextCompat.getDrawable(RegisterBirthDateAndGenderActivity.this,
              R.drawable.button_active));
          }
        }
      });

    }
  });

Answer 1

您的代码没有什么问题

1. rGroup。如果用户首先选择单选按钮，则不会触发setOnCheckedChangeListener（）。 需要重新定位到onDateChanged（）之外

2. 重新定位后，它也不会工作，因为radiogroup listener不知道datePicker条目是否也发生了更改

3. 用户可以选择先更新性别，然后更新日期，反之亦然。 可能的解决方案如下：

查看fixme以获得评论

// fixme: Add class variables (booleans) to keep track of changed ui items
  private Boolean isDatePickerOnDateChanged = false;
  private Boolean isRadioGroupOnCheckedChanged = false;

// fixme: Re-locate rGroup.setOnCheckedChangeListener(..) to here.
  RadioButton non_binary_radio_button = rGroup.findViewById(rGroup.getCheckedRadioButtonId());
  rGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    public void onCheckedChanged(RadioGroup group, int checkedId) {
      //...
      isRadioGroupOnCheckedChanged = true;
      if (isDatePickerOnDateChanged && isRadioGroupOnCheckedChanged) {
        continue_register_birthday_gender_button.setEnabled(true);
      }

// fixme: Remove previous rGroup.setOnCheckedChangeListener(..) inside onDateChanged() to above
  datePicker_birthday.init(... {
    @Override
    public void onDateChanged(DatePicker datePicker, int year, int month, int dayOfMonth) {
      //...
      isDatePickerOnDateChanged = true;
      if (isDatePickerOnDateChanged && isRadioGroupOnCheckedChanged) {
        continue_register_birthday_gender_button.setEnabled(true);
      }

1. 上述解决方案中有一点冗余代码：

      isRadioGroupOnCheckedChanged = true;
      if (isDatePickerOnDateChanged && isRadioGroupOnCheckedChanged) {
        continue_register_birthday_gender_button.setEnabled(true);
      }

可以简化为

      isRadioGroupOnCheckedChanged = true;
      if (isDatePickerOnDateChanged) {
        continue_register_birthday_gender_button.setEnabled(true);
      }

因为&& isRadioGroupOnCheckedChanged始终为真，因为前面的语句isRadioGroupOnCheckedChanged = true;