1.带有标题的页面

带有标题栏的样式Theme.MaterialComponents.DayNight.DarkActionBar

<style name="Theme.TIM" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
    <!-- Primary brand color. -->
    <item name="colorPrimary">@color/purple_500</item>
    <item name="colorPrimaryVariant">@color/purple_700</item>
    <item name="colorOnPrimary">@color/white</item>
    <!-- Secondary brand color. -->
    <item name="colorSecondary">@color/teal_200</item>
    <item name="colorSecondaryVariant">@color/teal_700</item>
    <item name="colorOnSecondary">@color/black</item>
    <!-- Status bar color. -->
    <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
    <!-- Customize your theme here. -->
</style>

 通过修改样式

<item name="colorPrimary">@color/white</item>
<item name="colorPrimaryVariant">@color/white</item>
<item name="colorOnPrimary">@color/white</item>

colorPrimaryVariant属性控制通知栏的颜色，

colorPrimary属性控制页面标题栏的颜色

 修改一致之后，通知栏的字体颜色也没了

这时在activity中需要把通知栏的文字设置成暗色

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
}

 2.不带标题栏的页面

不带标题栏的页面样式Theme.MaterialComponents.DayNight.NoActionBar

<style name="Theme.TIM" parent="Theme.MaterialComponents.DayNight.NoActionBar">
    <!-- Primary brand color. -->
    <item name="colorPrimary">@color/white</item>
    <item name="colorPrimaryVariant">@color/white</item>
    <item name="colorOnPrimary">@color/white</item>
    <!-- Secondary brand color. -->
    <item name="colorSecondary">@color/teal_200</item>
    <item name="colorSecondaryVariant">@color/teal_700</item>
    <item name="colorOnSecondary">@color/black</item>
    <!-- Status bar color. -->
    <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
    <!-- Customize your theme here. -->
</style>

 由于主题颜色是深色，所以通知栏的文字颜色自动设置成了白色来适应

通过修改主题样式中的colorPrimaryVariant属性，修改通知栏的颜色

 此时主题颜色变成亮色，需要手动在activity中修改文字颜色为黑色，来适配这个主题

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
}

3.在代码中动态设置通知栏的颜色和通知栏文字颜色

设置通知栏为浅色，则文字颜色设置成黑色

getWindow().setStatusBarColor(getResources().getColor(R.color.white, null));
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);

设置通知栏为深色，则文字颜色设置成白色

getWindow().setStatusBarColor(getResources().getColor(R.color.black, null));
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE);