夜间模式

1.切换夜间模式的工具类

注意：其中MODE要自己定义一个常量,mMode要在application中创建

/*
 * 使用这个类需要把style设置成日夜间的样式:Theme.AppCompat.DayNight.NoActionBar
 */
public class UIModeUtil {

    /**
     * 夜间模式切换
     */
    public static void changeModeUI(AppCompatActivity activity){
        int currentNightMode = activity.getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;

        if(currentNightMode == Configuration.UI_MODE_NIGHT_NO){
            //日间模式,切成夜间模式
            activity.getDelegate().setLocalNightMode(AppCompatDelegate.MODE_NIGHT_YES);
            SpUtil.setParam(Constants.MODE,AppCompatDelegate.MODE_NIGHT_YES);
            BaseApp.mMode = AppCompatDelegate.MODE_NIGHT_YES;
        }else{
            activity.getDelegate().setLocalNightMode(AppCompatDelegate.MODE_NIGHT_NO);
            SpUtil.setParam(Constants.MODE,AppCompatDelegate.MODE_NIGHT_NO);
            BaseApp.mMode = AppCompatDelegate.MODE_NIGHT_NO;
        }
    }

    /**
     * 设置当前的模式
     * @param activity
     */
    public static void setActModeFromSp(AppCompatActivity activity){
        int mode = (int) SpUtil.getParam(Constants.MODE, AppCompatDelegate.MODE_NIGHT_NO);
        activity.getDelegate().setLocalNightMode(mode);
    }

    /**
     * 设置当前的模式
     * @param activity
     */
    public static void setActModeUseMode(AppCompatActivity activity,int mode){
        activity.getDelegate().setLocalNightMode(mode);
    }

    public static void setAppMode(int mode){
        AppCompatDelegate.setDefaultNightMode(mode);
    }
}

2.SP工具类:

public class SpUtil {
    /**
     * 保存在手机里面的文件名
     */
    private static final String FILE_NAME = "share_date";
    
    
    /**
     * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
     * @param key
     * @param object 
     */
    public static void setParam( String key, Object object){
        
        String type = object.getClass().getSimpleName();
        SharedPreferences sp = BaseApp.getInstance().getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        
        if("String".equals(type)){
            editor.putString(key, (String)object);
        }
        else if("Integer".equals(type)){
            editor.putInt(key, (Integer)object);
        }
        else if("Boolean".equals(type)){
            editor.putBoolean(key, (Boolean)object);
        }
        else if("Float".equals(type)){
            editor.putFloat(key, (Float)object);
        }
        else if("Long".equals(type)){
            editor.putLong(key, (Long)object);
        }
        
        editor.commit();
    }
    
    
    /**
     * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
     * @param key
     * @param defaultObject
     * @return
     */
    public static Object getParam(String key, Object defaultObject){
        String type = defaultObject.getClass().getSimpleName();
        SharedPreferences sp = BaseApp.getInstance().getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        
        if("String".equals(type)){
            return sp.getString(key, (String)defaultObject);
        }
        else if("Integer".equals(type)){
            return sp.getInt(key, (Integer)defaultObject);
        }
        else if("Boolean".equals(type)){
            return sp.getBoolean(key, (Boolean)defaultObject);
        }
        else if("Float".equals(type)){
            return sp.getFloat(key, (Float)defaultObject);
        }
        else if("Long".equals(type)){
            return sp.getLong(key, (Long)defaultObject);
        }
        
        return null;
    }
}

3.在fragment中实现:

    @Override
    protected void initView() {
        super.initView();
        if (BaseApplication.mMode == AppCompatDelegate.MODE_NIGHT_NO) {
            cbNight.setChecked(false);
        } else {
            cbNight.setChecked(true);
        }
    }

    @Override
    protected void initListener() {
        super.initListener();
        cbNight.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                //判断是否是用户操作
                if (compoundButton.isPressed()) {
                    UIModeUtil.changeModeUI((MainActivity) getActivity());
                    //保存当前fragment的位置
                    SharedPreferencesUtil.setParam(mContext, Constants.FRAGMENT_POSITION, FragmentType.TYPE_SETTINGS);
                }
            }
        });
    }

4.在application中初始化:

public class BaseApp extends Application{

    private static BaseApp baseApp;
    public static int mMode= AppCompatDelegate.MODE_NIGHT_NO;

    @Override
    public void onCreate() {
        super.onCreate();
        baseApp=this;
        dayOrNight();

    }

    private void dayOrNight() {
        mMode = (int) SpUtil.getParam(Constants.MODE, AppCompatDelegate.MODE_NIGHT_NO);
        UIModeUtil.setAppMode(mMode);
    }

    public static BaseApp getInstance(){
        return baseApp;
    }
}

5.在activity中默认碎片是根据保存的fragment的位置:

private void addZhiFragment() {

      int pos = (int) SpUtil.getParam(Constants.NIGHT_CURRENT_FRAG_POS, 1);

      FragmentTransaction transaction = manager.beginTransaction();
      transaction.add(R.id.frame, list.get(0));
      transaction.commit();
  }

6.应用退出后保存主页面:

  @Override
   public boolean onTouchEvent(MotionEvent event) {
       SpUtil.setParam(Constants.NIGHT_CURRENT_FRAG_POS, MainActivity.TYPE_ZHIHU);
       return super.onTouchEvent(event);
   }

7.将主题更跟改成切换模式

 <style name="AppTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
       <!-- Customize your theme here. -->
       <item name="colorPrimary">@color/colorPrimary</item>
       <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
       <item name="colorAccent">@color/colorAccent</item>

8.重新定义一个color文件,将之前的白的变成黑色,黑色变成白的,而且把每一个fragment都加一个背景颜色,不能是透明.