Android Material Design 实现 Toolbar 替换 ActionBar 错误解决

Android Material Design 实现 Toolbar 替换 ActionBar 错误解决

报错信息：

This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.

错误原因：

该错误是由于在主题中同时使用了ActionBar和Toolbar导致的冲突。

解决方法：

在主题中设置windowActionBar为false，以使用Toolbar替代ActionBar。

步骤：

1. 修改styles.xml文件

<resources>
    <string name='app_name'>MaterialTest</string>

    <style name='AppTheme' parent='Theme.AppCompat.Light.NoActionBar'>
        <!-- Customize your theme here. -->
        <item name='colorPrimary'>@color/colorPrimary</item>
        <item name='colorPrimaryDark'>@color/colorPrimaryDark</item>
        <item name='colorAccent'>@color/colorAccent</item>
        <item name='android:textColorPrimary'>@color/colorPrimary</item>
        <item name='android:windowBackground'>@color/colorPrimaryDark</item>
        <item name='android:navigationBarColor'>@color/colorPrimary</item>
    </style>

    <style name='AppTheme.DarkActionBar' parent='Theme.AppCompat.Light.DarkActionBar'>
        <!-- Customize your theme here. -->
        <item name='colorPrimary'>@color/colorPrimary</item>
        <item name='colorPrimaryDark'>@color/colorPrimaryDark</item>
        <item name='colorAccent'>@color/colorAccent</item>
        <item name='android:textColorPrimary'>@color/colorPrimary</item>
        <item name='android:windowBackground'>@color/colorPrimaryDark</item>
        <item name='android:navigationBarColor'>@color/colorPrimary</item>
    </style>
</resources>

2. 修改MainActivity的onCreate方法

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)

    // 使用AppTheme主题
    setTheme(R.style.AppTheme)

    setContentView(binding.root)

    setSupportActionBar(binding.toolbar)
}

通过以上修改，即可解决该问题。