设置主题

主题在Androidmanifest.xml中设置

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.SIM" <!--this-->
        tools:targetApi="29">
        <activity
            android:name=".NotificationActivity"
            android:exported="false" />
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

样式和主题在 res/values/ 中的样式说明文件(themes.xml)声明。

以下是我的应用的主题声明,colorPrimary属性能改变主题颜色，修改后状态栏以及Button颜色都会改变

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Base.Theme.SIM" parent="Theme.Material3.DayNight.NoActionBar">
        <!-- Customize your light theme here. -->
         <item name="colorPrimary">#468347</item>
    </style>

    <style name="Theme.SIM" parent="Base.Theme.SIM" />
</resources>

在声明了主题之后我想试试统一Button的风格，于是添加如下代码

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Base.Theme.SIM" parent="Theme.Material3.DayNight.NoActionBar">
        <!-- Customize your light theme here. -->
         <item name="colorPrimary">#468347</item>
        <item name="buttonStyle">@style/Button</item>
    </style>

    <style name="Theme.SIM" parent="Base.Theme.SIM" />
    <style name="Button" parent="@style/Widget.AppCompat.Button">
        <item name="android:textColor">#784897</item>
        <item name="minWidth">100dp</item>
        <item name="backgroundColor">#898089</item>
    </style>
</resources>

但<item name="buttonStyle">@style/Button</item>这种用法并没有对button起效，不知道这是为什么