//檢查當(dāng)前系統(tǒng)是否已開啟暗黑模式
  public static boolean getDarkModeStatus(Context context) {
    int mode = context.getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
    return mode == Configuration.UI_MODE_NIGHT_YES;
  }

//正常模式下的主題
 <style name="main_theme_light" parent="Theme.AppCompat.DayNight.DarkActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="main_text_color">@color/main_text_color_light</item>
    <item name="main_bg_color">@color/main_bg_color_light</item>
  </style>

//黑暗模式下的主題
 <style name="main_theme_dark" parent="Theme.AppCompat.DayNight.DarkActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="main_text_color">@color/main_text_color_dark</item>
    <item name="main_bg_color">@color/main_bg_color_dark</item>
  </style>

 <!--  主要字體顏色-->
  <attr name="main_text_color" format="color" />
 <!--  主要背景顏色-->  
  <attr name="main_bg_color" format="color" />


 //不同模式下的顏色屬性值
 <color name="main_text_color_light">#000000</color>
  <color name="main_text_color_dark">#ffffff</color>
  <color name="main_bg_color_light">#ffffff</color>
  <color name="main_bg_color_dark">#000000</color>

//在xml文件中使用我們自定義屬性
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="?attr/main_bg_color">

  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:textColor="?attr/main_text_color"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

//在BaseActivity中切換不同的主題，才能使我們自定義的屬性生效，必須在setContentView()方法前設(shè)置：
 @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
    if (getDarkModeStatus(this)) {
      setTheme(R.style.main_theme_dark);
    }else {
      setTheme(R.style.main_theme_light);
    }
    setContentView(R.layout.activity_main)
   }

//為達(dá)到更好的適配效果，可在xml文件的activity節(jié)點(diǎn)下加入如下屬性：
android:configChanges="uiMode"