Question

我正在尝试设置按钮的样式，同时保持向后兼容性。

我有两个文件如下：

values/styles.xml:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Main theme colors -->
        <!--   your app branding color for the app bar -->
        <item name="colorPrimary">@color/primary</item>
        <!--   darker variant for the status bar and contextual app bars -->
        <item name="colorPrimaryDark">@color/primary_dark</item>
        <!--   theme UI controls like checkboxes and text fields -->
        <item name="colorAccent">@color/accent</item>
        <item name="android:textColorPrimary">@color/primary_text</item>
        <item name="android:textColorSecondary">@color/secondary_text</item>

        <item name="android:buttonStyle">@style/RoundedButton</item>
    </style>

    <style name="RoundedButton" parent="@style/Widget.AppCompat.Button">
    </style>

    <style name="AppName.NoActionBar" parent="AppTheme" >
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="DemoButton">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:minWidth">40dp</item>
    </style>
</resources>

values-v21/styles.xml:

<resources>
    <style name="RoundedButton" parent="Widget.AppCompat.Button">
        <item name="android:background">@drawable/btn_rounded</item>
    </style>
</resources>

但即便如此，我的按钮也会丢失所有属性，即按照android-studio的“XML预览”显示文本。我只想让按钮在pre-lolipop设备上默认为通常的Holo主题。它在Lolipop设备上按预期工作。我做错了什么？

Answer 1

在values / styles.xml中

<style name="RoundedButton" parent="@style/Widget.AppCompat.Button">
</style>

将其更改为关注： -

 <style name="RoundedButton" parent="android:Widget.Holo">
 </style>

Answer 2

我无法找出导致这种情况发生的原因，因此我从<item name="android:buttonStyle">@style/RoundedButton</item>文件中删除了行values/styles.xml，并将其添加到我的values-v21/styles.xml。

我不喜欢这个解决方案，因为有很多代码重复。关于它的唯一好处是它有效。

现在我的文件看起来像：

values/styles.xml:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Main theme colors -->
        <!--   your app branding color for the app bar -->
        <item name="colorPrimary">@color/primary</item>
        <!--   darker variant for the status bar and contextual app bars -->
        <item name="colorPrimaryDark">@color/primary_dark</item>
        <!--   theme UI controls like checkboxes and text fields -->
        <item name="colorAccent">@color/accent</item>
        <item name="android:textColorPrimary">@color/primary_text</item>
        <item name="android:textColorSecondary">@color/secondary_text</item>

    </style>

    <style name="AppName.NoActionBar" parent="AppTheme" >
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="DemoButton">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:minWidth">40dp</item>
    </style>
</resources>

v21/styles.xml:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Main theme colors -->
        <!--   your app branding color for the app bar -->
        <item name="colorPrimary">@color/primary</item>
        <!--   darker variant for the status bar and contextual app bars -->
        <item name="colorPrimaryDark">@color/primary_dark</item>
        <!--   theme UI controls like checkboxes and text fields -->
        <item name="colorAccent">@color/accent</item>
        <item name="android:textColorPrimary">@color/primary_text</item>
        <item name="android:textColorSecondary">@color/secondary_text</item>

        <item name="android:buttonStyle">@style/RoundedButton</item>
    </style>

    <style name="RoundedButton" parent="Widget.AppCompat.Button">
        <item name="android:background">@drawable/btn_rounded</item>
    </style>

    <style name="AppName.NoActionBar" parent="AppTheme" >
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <style name="DemoButton">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:minWidth">40dp</item>
    </style>
</resources>

使用v-21 / styles.xml的向后兼容性不起作用

2 个答案: