Android夜间模式动态切换不闪屏

夜间模式在一些资讯类app中是不可缺少的，通过查阅资料发现Android官方在Support Library 23.2.0中已经加入了夜间主题。也就是只需要通过更换主题便可实现日间模式和夜间模式的切换。下面截取项目实现的夜间模式效果图：

Android夜间模式动态切换不闪屏

实现夜间模式需要的配置

1.配置gradle

   implementation 'com.android.support:appcompat-v7:26.1.0'

2.添加夜间颜色资源文件

Android夜间模式动态切换不闪屏

其中 colors.xml

    <color name="colorPrimary">#FFFFFF</color>
    <color name="colorPrimaryDark">#ffe0e0e0</color>
    <color name="colorAccent">#03A9F4</color>

    <color name="colorBaseBackground">#fafafa</color>

    <color name="colorNavItemUnselected">#757575</color>
    <color name="colorNavItemSelected">@color/colorAccent</color>

    <color name="colorPrimaryText">#212121</color>
    <color name="colorSecondaryText">#757575</color>

values-night 夜间文件夹切换的时候系统会自己去找这个文件夹

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#35464e</color>
    <color name="colorPrimaryDark">#212a2f</color>
    <color name="colorAccent">#03A9F4</color>

    <color name="colorPrimaryText">#e4e4e4</color>
    <color name="colorSecondaryText">#b5b5b5</color>

    <color name="colorBaseBackground">#212a2f</color>

    <color name="colorNavItemSelected">#03A9F4</color>
    <color name="colorNavItemUnselected">#8799a5</color>
</resources>

切换逻辑实现这里需要介绍一下有关夜间模式的几个常量值。AppCompatDelegate.setDefaultNightMode(mode),其中mode有一下四个值：

MODE_NIGHT_NO：亮色(light)主题，不使用夜间模式
MODE_NIGHT_YES：暗色(dark)主题，使用夜间模式
MODE_NIGHT_AUTO：根据当前时间自动切换亮色(light)/暗色(dark)主题（22：00-07：00时间段内自动切换为夜间模式）
MODE_NIGHT_FOLLOW_SYSTEM(默认选项)：设置为跟随系统，通常为MODE_NIGHT_NO
2.接下来需要我们在设置页面点击ToggleButton时切换白天/夜间模式。
具体实现如下：

/**
 * Created by admin on 2018/11/1.
 */

public abstract class BaseActivity extends AppCompatActivity {

    private boolean mNowMode;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        View inflate = LayoutInflater.from(this).inflate(initView(), null);
        setContentView(inflate); ;
           mNowMode = SharedPreferencesUtil.getInstance().getBoolean(Constant.NIGHT);
           initWidget(inflate);
        if(savedInstanceState ==null){
            initData();
        }else{
            restoreSavedInstanceState(savedInstanceState);
        }
    }

    protected abstract void restoreSavedInstanceState(Bundle savedInstanceState);

    protected abstract void initWidget(View inflate);

    protected abstract void initData();

    protected abstract int initView();

    @Override
    protected void onResume() {
        super.onResume();
            theme();
    }

    protected void theme() {
        if (SharedPreferencesUtil.getInstance().getBoolean(Constant.NIGHT, false) != mNowMode) {  //为了避免当 通过recreate重启activity造成死循环
            if (SharedPreferencesUtil.getInstance().getBoolean(Constant.NIGHT, false)) {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
            } else {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
            }
            recreate();

        }
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();

    }
}

创建 Main2Activity.java 去完成夜间模式数据恢复

public class Main2Activity extends BaseActivity {

    private ListView lv;
    private CommonAdapter<String> adapter;
    ArrayList<String> list = new ArrayList<>();;
    @Override
    protected void initWidget(View inflate) {
        lv = findViewById(R.id.lv);

        inflate.findViewById(R.id.tv).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (SharedPreferencesUtil.getInstance().getBoolean(Constant.NIGHT, false)) {
                    SharedPreferencesUtil.getInstance().putBoolean(Constant.NIGHT, false);
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                } else {
                    SharedPreferencesUtil.getInstance().putBoolean(Constant.NIGHT, true);
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                }
                recreate();
            }
        });

        adapter = new CommonAdapter<String>(this,list, R.layout.item) {
            @Override
            public void convert(ViewHolder holder, String s) {
                TextView item_tv = holder.getView(R.id.item_tv);
                item_tv.setText(s);
            }
        };
        lv.setAdapter(adapter);

    }


    @Override
    protected void initData() {
            list.add("abc");
            list.add("abc");
            list.add("abc");
    }


    @Override
    protected int initView() {
        return R.layout.activity_main2;
    }

    /**
     *  恢复数据
     * @param savedInstanceState
     */
    @Override
    protected void restoreSavedInstanceState(Bundle savedInstanceState) {
        list.addAll(savedInstanceState.getStringArrayList("list"));

        adapter.notifyDataSetChanged();
    }

    /**
     * recreate()方法会触发  这个保存数据方法
     * @param outState
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putStringArrayList("list", list);

    }

    @Override
    protected void onResume() {
        super.onResume();

    }
}

activity_main2.XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="com.roy.admin.themedemo.Main2Activity">


    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="黑夜切换"
        android:textSize="20sp"
        android:textColor="@color/colorPrimaryText"
        android:layout_centerInParent="true"
        />

    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/tv"
        >

    </ListView>

</RelativeLayout>

最后奉上demo地址：https://download.****.net/download/cly19940419/10759100

Android夜间模式动态切换不闪屏

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