第二阶段冲刺第七天

摘要：今天完成了开启夜间模式功能

代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="@string/day_night_label"
        android:textSize="20sp"
        android:textColor="@color/colorDayNightChange" />

    <Button
        android:id="@+id/day_night_change"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_marginLeft="5dp"
        android:text="日夜间模式切换"
        android:textSize="20sp"
        android:textColor="@color/colorDayNightChange"/>
</LinearLayout>

package com.example.nighttheme;

import android.content.res.Configuration;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.app.AppCompatDelegate;

public class MainActivity extends AppCompatActivity {
    private Button mDayNightChange;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mDayNightChange = (Button) findViewById(R.id.day_night_change);

        mDayNightChange.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int mode = getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
                if (mode == Configuration.UI_MODE_NIGHT_YES) {
                    getDelegate().setLocalNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                } else if (mode == Configuration.UI_MODE_NIGHT_NO) {
                    getDelegate().setLocalNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                }

                recreate();
            }
        });
    }
}

package com.example.nighttheme;

import android.app.Application;

import androidx.appcompat.app.AppCompatDelegate;

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        /**
         * 默认设置一直使用夜间模式
         *
         * 这里AppCompatDelegate.setDefaultNightMode()方法可以接受的参数值有4个：
         * MODE_NIGHT_NO. Always use the day (light) theme(一直应用日间(light)主题).
         * MODE_NIGHT_YES. Always use the night (dark) theme(一直使用夜间(dark)主题).
         * MODE_NIGHT_AUTO. Changes between day/night based on the time of day(根据当前时间在day/night主题间切换).
         * MODE_NIGHT_FOLLOW_SYSTEM(默认选项). This setting follows the system's setting, which is essentially MODE_NIGHT_NO(跟随系统，通常为MODE_NIGHT_NO).
         */
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
    }
}

可以进行夜间模式的切换了！还没来的及整合。