直接上代码

public class DarkModeUtils {

    public static final String KEY_CURRENT_MODEL = "night_mode_state_sp";

    private static int getNightModel(Context context) {
        SharedPreferences sp = context.getSharedPreferences(KEY_CURRENT_MODEL, Context.MODE_PRIVATE);
        return sp.getInt(KEY_CURRENT_MODEL, AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
    }

    public static void setNightModel(Context context, int nightMode) {
        SharedPreferences sp = context.getSharedPreferences(KEY_CURRENT_MODEL, Context.MODE_PRIVATE);
        sp.edit().putInt(KEY_CURRENT_MODEL, nightMode).apply();
    }

    /**
     * ths method should be called in Application onCreate method
     *
     * @param application application
     */
    public static void init(Application application) {
        int nightMode = getNightModel(application);
        AppCompatDelegate.setDefaultNightMode(nightMode);
    }

    /**
     * 应用夜间模式
     */
    public static void applyNightMode(Context context) {
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
        setNightModel(context, AppCompatDelegate.MODE_NIGHT_YES);
    }

    /**
     * 应用日间模式
     */
    public static void applyDayMode(Context context) {
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
        setNightModel(context, AppCompatDelegate.MODE_NIGHT_NO);
    }

    /**
     * 跟随系统主题时需要动态切换
     */
    public static void applySystemMode(Context context) {
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
        setNightModel(context, AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
    }

    /**
     * 判断App当前是否处于暗黑模式状态
     *
     * @param context 上下文
     * @return 返回
     */
    public static boolean isDarkMode(Context context) {
        int nightMode = getNightModel(context);
        if (nightMode == AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM) {
            int applicationUiMode = context.getResources().getConfiguration().uiMode;
            int systemMode = applicationUiMode & Configuration.UI_MODE_NIGHT_MASK;
            return systemMode == Configuration.UI_MODE_NIGHT_YES;
        } else {
            return nightMode == AppCompatDelegate.MODE_NIGHT_YES;
        }
    }

}

使用流程

很明显这是切换暗黑模式的方法，在调用前必选先适配App的暗黑样式。

如何适配

需要注意

androidx上直接调用即可。support上使用并且在Activity中切换暗黑模式，需要动态调用一下activity.recreate()方法。具体原因看下面源码：

androidx版本：

/**
     * Sets the default night mode. This is the default value used for all components, but can
     * be overridden locally via {@link #setLocalNightMode(int)}.
     *
     * 
This is the primary method to control the DayNight functionality, since it allows
     * the delegates to avoid unnecessary recreations when possible.
     *
     * 
If this method is called after any host components with attached
     * {@link AppCompatDelegate}s have been 'started', a {@code uiMode} configuration change
     * will occur in each. This may result in those components being recreated, depending
     * on their manifest configuration.
     *
     * 
Defaults to {@link #MODE_NIGHT_FOLLOW_SYSTEM}.
     *
     * @see #setLocalNightMode(int)
     * @see #getDefaultNightMode()
     */
    public static void setDefaultNightMode(@NightMode int mode) {
        switch (mode) {
            case MODE_NIGHT_NO:
            case MODE_NIGHT_YES:
            case MODE_NIGHT_FOLLOW_SYSTEM:
            case MODE_NIGHT_AUTO_TIME:
            case MODE_NIGHT_AUTO_BATTERY:
                if (sDefaultNightMode != mode) {
                    sDefaultNightMode = mode;
                    applyDayNightToActiveDelegates();
                }
                break;
            default:
                Log.d(TAG, "setDefaultNightMode() called with an unknown mode");
                break;
        }
    }

support版本：

public static void setDefaultNightMode(int mode) {
        switch(mode) {
        case -1:
        case 0:
        case 1:
        case 2:
            sDefaultNightMode = mode;
            break;
        default:
            Log.d("AppCompatDelegate", "setDefaultNightMode() called with an unknown mode");
        }
    }

对比后可以发现androidx切换暗黑模式后，自己主动调用了apply方法，使Activity重建。而support上没有，仅仅是赋值而已。所以support版本上使用需要自己调用activity.recreate()方法。

总结

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