MaterialDatePicker error: materialCalendarFullscreenTheme attribute to be set in your app theme

Question

我做了什么：

在依赖项中添加了implementation 'com.google.android.material:material:1.1.0'
将 Theme.MaterialComponents.Light.Bridge 设置为应用主题的父项

     <style name="AppTheme" parent="Theme.MaterialComponents.Light.Bridge">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

试图在片段中显示日期选择器。

MaterialDatePicker.Builder<Pair<Long, Long>> builder = MaterialDatePicker.Builder.dateRangePicker();

        Calendar now = Calendar.getInstance();
        now.set(Calendar.YEAR, 2020);
        now.set(Calendar.MONTH, 1);
        now.set(Calendar.DAY_OF_MONTH, 10);

        long first = now.getTimeInMillis();

        now.set(Calendar.YEAR, 2020);
        now.set(Calendar.MONTH, 5);
        now.set(Calendar.DAY_OF_MONTH, 20);

        long last = now.getTimeInMillis();

        builder.setSelection(new Pair<>(first, last));

        MaterialDatePicker<Pair<Long, Long>> picker = builder.build();

        picker.show(fragmentActivity.getSupportFragmentManager(), "RangePicker");

当我运行代码时，得到这个错误

java.lang.IllegalArgumentException: com.google.android.material.datepicker.MaterialDatePicker
requires a value for the com.example:attr/materialCalendarFullscreenTheme attribute to be set
in your app theme. You can either set the attribute in your theme or update your theme to
inherit from Theme.MaterialComponents (or a descendant).

Answer 1

只需将以下内容添加到您的应用主题中即可。

<item name="materialCalendarStyle">@style/Widget.MaterialComponents.MaterialCalendar</item>
<item name="materialCalendarFullscreenTheme">@style/ThemeOverlay.MaterialComponents.MaterialCalendar.Fullscreen</item>
<item name="materialCalendarTheme">@style/ThemeOverlay.MaterialComponents.MaterialCalendar</item>

添加后

<style name="AppTheme" parent="Theme.MaterialComponents.Light.Bridge">
   <!-- Customize your theme here. -->
   <item name="colorPrimary">@color/colorPrimary</item>
   <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
   <item name="colorAccent">@color/colorAccent</item>

   <!-- Add these -->
   <item name="materialCalendarStyle">@style/Widget.MaterialComponents.MaterialCalendar</item>
   <item name="materialCalendarFullscreenTheme">@style/ThemeOverlay.MaterialComponents.MaterialCalendar.Fullscreen</item>
   <item name="materialCalendarTheme">@style/ThemeOverlay.MaterialComponents.MaterialCalendar</item>
</style>

Answer 2

有一个简单的解决办法！只需确保 theme.xml 与您在清单文件部分主题中使用的主题相同。在 android 清单中： android:theme="@style/Theme.MaterialComponents.DayNight.NoActionBar"> 在 theme.xml 中：

MaterialDatePicker error: materialCalendarFullscreenTheme attribute to be set in your app theme

MaterialDatePicker error: materialCalendarFullscreenTheme attribute to be set in your app theme

android

datepicker

material-components-android

只需将以下内容添加到您的应用主题中即可。

添加后