夜间模式 values-night

import android.app.Activity;import android.content.SharedPreferences;import android.content.res.Configuration;import android.preference.PreferenceManager;import java.lang.ref.WeakReference;/** * Night Mode Helper * <p> * Helps use utilise the night and notnight resource qualifiers without being in car or dock mode. * <p> * Implementation is simple. Add the follow line at the top of your activity's onCreate just after * the super.onCreate(); The idea here is to do it before we create any views. So the new views will * use the correct Configuration. *  * <pre> * mNightModeHelper = new NightModeHelper(this, R.style.AppTheme); * </pre> *  * You can now use your instance of NightModeHelper to control which mode you are in. You can choose * to persist the current setting and hand it back to this class as the defaultUiMode, otherwise * this is done for you automatically. * <p> * I'd suggest you setup your Theme as follows: * <ul> * <li><b>res\values\styles.xml</b> *  * <pre> * &lt;style name=&quot;AppTheme&quot; parent=&quot;AppBaseTheme&quot;&gt;&lt;/style&gt; * </pre> *  * </li> * <li><b>res\values-night\styles.xml</b> *  * <pre> * &lt;style name=&quot;AppBaseTheme&quot; parent=&quot;@android:style/Theme.Holo&quot;&gt;&lt;/style&gt; * </pre> *  * </li> * <li><b>res\values-notnight\styles.xml</b> *  * <pre> * &lt;style name=&quot;AppBaseTheme&quot; parent=&quot;@android:style/Theme.Holo.Light&quot;&gt;&lt;/style&gt; * </pre> *  * </li> * </ul> *  * @author Simon Lightfoot <[e-mail]> */public class NightModeHelper {    private static final String PREF_KEY = "nightModeState";    private static int sUiNightMode = Configuration.UI_MODE_NIGHT_UNDEFINED;    private WeakReference<Activity> mActivity;    private SharedPreferences mPrefs;    /**     * Default behaviour is to automatically save the setting and restore it.     */    public NightModeHelper(Activity activity, int theme) {        int currentMode = (activity.getResources().getConfiguration().uiMode                & Configuration.UI_MODE_NIGHT_MASK);        mPrefs = PreferenceManager.getDefaultSharedPreferences(activity);        init(activity, theme, mPrefs.getInt(PREF_KEY, currentMode));    }    /**     * If you don't want the autoSave feature and instead want to provide your own persisted storage     * for the mode, use the defaultUiMode for it.     */    public NightModeHelper(Activity activity, int theme, int defaultUiMode) {        init(activity, theme, defaultUiMode);    }    public static int getUiNightMode() {        return sUiNightMode;    }    private void init(Activity activity, int theme, int defaultUiMode) {        mActivity = new WeakReference<Activity>(activity);        if (sUiNightMode == Configuration.UI_MODE_NIGHT_UNDEFINED) {            sUiNightMode = defaultUiMode;        }        updateConfig(sUiNightMode);        // This may seem pointless but it forces the Theme to be reloaded        // with new styles that would change due to new Configuration.        activity.setTheme(theme);    }    private void updateConfig(int uiNightMode) {        Activity activity = mActivity.get();        if (activity == null) {            throw new IllegalStateException("Activity went away?");        }        Configuration newConfig = new Configuration(activity.getResources().getConfiguration());        newConfig.uiMode &= ~Configuration.UI_MODE_NIGHT_MASK;        newConfig.uiMode |= uiNightMode;        activity.getResources().updateConfiguration(newConfig, null);        sUiNightMode = uiNightMode;        if (mPrefs != null) {            mPrefs.edit()                    .putInt(PREF_KEY, sUiNightMode)                    .apply();        }    }    public void toggle() {        if (sUiNightMode == Configuration.UI_MODE_NIGHT_YES) {            notNight();        } else {            night();        }    }    public void notNight() {        updateConfig(Configuration.UI_MODE_NIGHT_NO);        mActivity.get().recreate();    }    public void night() {        updateConfig(Configuration.UI_MODE_NIGHT_YES);        mActivity.get().recreate();    }}

转自https://gist.github.com/slightfoot/c508cdc8828a478572e0