java - 如何在 Android 7.0 的微调器模式下修复 DatePickerDialog？

Question

我目前正在开发一个简单的项目，该项目包含一个包含在 Web View 中的网站，并带有少量交互，以提高网站本身与 Android 移动设备之间的交互性。

由于网站包含用户生日的日期输入字段，我希望实现一个与所有设备兼容的微调器格式的日期选择器。我尝试实现以下解决方案:

`<style name="MyAppTheme" parent="android:Theme.Material">
    <item name="android:dialogTheme">@style/MyDialogTheme</item>
    <item name="android:datePickerStyle">@style/MyDatePicker</item>
</style>
<style name="MyDialogTheme" parent="android:Theme.Material.Dialog">
    <item name="android:datePickerStyle">@style/MyDatePicker</item>
</style>
<style name="MyDatePicker" parent="android:Widget.Material.DatePicker">
    <item name="android:datePickerMode">spinner</item>
</style>`

如图: Datepicker dialog without calendar visualization in lollipop [spinner mode]?

但是，正如答案所指出的那样，由于以下已知错误，此解决方案不适用于 Android 7.0 Nougat/API 24:https://issuetracker.google.com/issues/37119315

在做一些研究时，我遇到了一些建议的解决方案，例如:

https://gist.github.com/uqmessias/d9a8dc624af935f344dfa2e8928490ec

https://gist.github.com/lognaturel/232395ee1079ff9e4b1b8e7096c3afaf

DatePickerDialog Holo styling failed on Android 7 Nougat

但就我而言，它们似乎都不适用于搭载 Android 7.0 的设备或任何其他设备。

我在 Android 开发方面经验不足，所以我想知道是什么导致了这个问题，我该如何解决它，因为一些解决方案一直维护到最近，几乎丢弃了它们可能已经过时的东西。

我是否需要实现我发布的代码中未指出且我不知道的内容？

是不是 datepicker 元素是直接从 Web View 而不是从应用程序本身调用的，这使得这些解决方案对我来说毫无用处吗？如果是这样，是否有任何解决方法？

Answer 1

我遇到了同样的问题(用户不想逐月向后滚动 40 年来查找他们的出生年份，而且大多数人不知道您只需单击 android 日期选择器中的年份即可滚动经过多年)。像你一样，我无法让微调器普遍工作，所以我想出了(在 SO 和 Google 的帮助下)如何让它在年份选择模式下启动。

我的 DatePickerDialogFragment 的代码粘贴在下面。

public class DatePickerDialogFragment extends DialogFragment {

    private DatePickerDialog.OnDateSetListener listener = null;

    void setListener(DatePickerDialog.OnDateSetListener listener) {
        this.listener = listener;
    }

    private static final String START_IN_YEARS = "com.myapp.picker.START_IN_YEARS";
    private static final String YEAR = "com.myapp.picker.YEAR";
    private static final String MONTH = "com.myapp.picker.MONTH";
    private static final String DAY_OF_MONTH = "com.myapp.picker.DAY_OF_MONTH";

    public static DatePickerDialogFragment newInstance(boolean startInYears, Calendar c) {
        DatePickerDialogFragment f = new DatePickerDialogFragment();

        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        Bundle args = new Bundle();
        args.putBoolean(START_IN_YEARS, startInYears);
        args.putInt(YEAR, year);
        args.putInt(MONTH, month);
        args.putInt(DAY_OF_MONTH, day);

        f.setArguments(args);
        return f;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        Bundle args = getArguments();
        DatePickerDialog dpd = null;

        if( listener != null && args != null) {
            boolean startInYears = args.getBoolean(START_IN_YEARS);

            Context context = getActivity();
            boolean requireSpinnerMode = isBrokenSamsungDevice();
            if (requireSpinnerMode) {
                context = new ContextThemeWrapper(context, android.R.style.Theme_Holo_Light_Dialog);
            }

            int year = args.getInt(YEAR);
            int month = args.getInt(MONTH);
            int day = args.getInt(DAY_OF_MONTH);

            dpd = new DatePickerDialog(context, listener, year, month, day);

            if (startInYears && !requireSpinnerMode) {
                boolean canOpenYearView = openYearView(dpd.getDatePicker());
                if (!canOpenYearView) {
                    context = new ContextThemeWrapper(getActivity(), android.R.style.Theme_Holo_Light_Dialog);
                    dpd = new DatePickerDialog(context, listener, year, month, day);
                }
            }
        }
        else {
            setShowsDialog(false);
            dismissAllowingStateLoss();
        }

        return dpd;
    }

    private static boolean isBrokenSamsungDevice() {
        return Build.MANUFACTURER.equalsIgnoreCase("samsung") &&
                isBetweenAndroidVersions(
                        Build.VERSION_CODES.LOLLIPOP,
                        Build.VERSION_CODES.LOLLIPOP_MR1);
    }

    private static boolean isBetweenAndroidVersions(int min, int max) {
        return Build.VERSION.SDK_INT >= min && Build.VERSION.SDK_INT <= max;
    }

    private static boolean openYearView(DatePicker datePicker) {
        if( isBrokenSamsungDevice() ) {
            return false;
        }

        View v = datePicker.findViewById(Resources.getSystem().getIdentifier("date_picker_header_year", "id", "android"));
        if( v != null ) {
            v.performClick();
        }
        else {
            try {
                Field mDelegateField = datePicker.getClass().getDeclaredField("mDelegate");
                mDelegateField.setAccessible(true);
                Object delegate = mDelegateField.get(datePicker);
                Method setCurrentViewMethod = delegate.getClass().getDeclaredMethod("setCurrentView", int.class);
                setCurrentViewMethod.setAccessible(true);
                setCurrentViewMethod.invoke(delegate, 1);
            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
        }
        return true;
    }
}

Activity 中的代码(成员变量和 onCreate 中的内容)启动它(并在旋转时保留它)看起来像这样:

// Class member variables
private Calendar myCalendar = Calendar.getInstance();
private boolean birthday_is_set = false;


// this next part is in onCreate

// set the calendar date to a saved date if applicable
// and change birthday_is_set if they had saved a birthday


final DatePickerDialog.OnDateSetListener birthdayListener = new DatePickerDialog.OnDateSetListener() {

    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear,
                          int dayOfMonth) {
        // I save the date in a calendar, replace this
        // with whatever you want to do with the selected date
        myCalendar.set(Calendar.YEAR, year);
        myCalendar.set(Calendar.MONTH, monthOfYear);
        myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        birthday_is_set = true;
        updateBirthdayLabel();
    }
};

if (savedInstanceState != null) {
    DatePickerDialogFragment dpf;

    dpf = (DatePickerDialogFragment) getFragmentManager().findFragmentByTag("birthdayDatePicker");
    if (dpf != null) {
        // on rotation the listener will be referring to the old Activity,
        // so we have to reset it here to act on the current Activity
        dpf.setListener(birthdayListener);
    }
}

birthdayDatePicker.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Your logic may vary here. I chose not to start it in year
        // mode if they've already selected a date.
        boolean startInYears = !birthday_is_set;
        DatePickerDialogFragment dpf = DatePickerDialogFragment.newInstance(startInYears, myCalendar);
        dpf.setListener(birthdayListener);
        dpf.show(getFragmentManager(), "birthdayDatePicker");
    }
});

这包括让它以年模式启动的黑客攻击，以及对特定年份三星设备上一些随机日期选择器故障的修复。这个版本几个月来一直在运行，没有崩溃，也没有用户对 API 15+ 的投诉。

编辑:更新 openYearView 以在 Android 10 上运行