onDateChanged和onCheckedChanged一起工作

Question

在一个活动中，我有一个datePicker（旋转器），它允许用户选择他们的出生日期，在此之下，用户还必须选择他们的性别。我有一个按钮，一旦设置了两个值（日期和性别），就会启用该按钮。尽管首先更改了值，但我现在面临的问题是启用该按钮。当前，用户必须选择其出生日期，然后选择其性别，才能激活该按钮。我希望无论首先更改哪个值都可以启用该按钮。

这是我的代码：

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

您的代码很少有问题。

1. 如果用户首先选择了单选按钮选择，则不会触发rGroup.setOnCheckedChangeListener（）。需要重新放置在onDateChanged（）之外。

2. 重定位后，它也将无法工作，因为无线电组侦听器不知道datePicker条目是否也被更改。

3. 用户可以选择先更新性别，然后选择日期，反之亦然。可能的解决方案如下：

查看fixme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. 上述解决方案中的一些冗余代码：

     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前面的陈述总是正确的isRadioGroupOnCheckedChanged = true;。