<?xml version="1.0" encoding="utf-8"?>

<resources>

   <attr name="bookimage" format="reference|color" />

    <attr name="tvcolor" format="reference|color" />

</resources>

<?xml version="1.0" encoding="utf-8"?>

<resources>

        <!-- 默认风格 -->

    <style name="BrowserThemeDefault" parent="@android:style/Theme.Black.NoTitleBar">

        <item name="bookimage">@android:color/white</item>

         <item name="tvcolor">@android:color/darker_gray</item>

    </style>

    <!-- 夜间模式 -->

    <style name="BrowserThemeNight" parent="@android:style/Theme.Black.NoTitleBar">

        <item name="bookimage">@android:color/transparent</item>

         <item name="tvcolor">@android:color/white</item>

    </style>

</resources>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"
       //界面颜色改变

      android:background="?bookimage"

     >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" 
        //字体颜色改变

        android:textColor="?tvcolor"/>

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"
        //监听方法

        android:onClick="btonclick"

        android:text="日/夜间模式切换" />

    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView1"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="116dp"

        android:onClick="btonclick2"

        android:text="跳转其他页面" />

</RelativeLayout>

package com.example.zdndemo;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.View;

public class MainActivity extends Activity {

    private static boolean blFlag = false;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        SharedPreferences preferences = getSharedPreferences("default_night",

                MODE_PRIVATE);

           blFlag = preferences.getBoolean("default_night",true);

        if (blFlag) {

             this.setTheme(R.style.BrowserThemeDefault);

        }

        else {

            this.setTheme(R.style.BrowserThemeNight);

        }

        //上面的代码必须要放在setContentView之上

        setContentView(R.layout.activity_main);

    }

    public void btonclick(View view) {

        SharedPreferences preferences = getSharedPreferences("default_night",MODE_PRIVATE);

        Editor editor = preferences.edit();

        if (blFlag) {

            this.setTheme(R.style.BrowserThemeNight);

            blFlag =false;

            editor.putBoolean("default_night",false);

        } else {

            this.setTheme(R.style.BrowserThemeDefault);

            blFlag = true;

            editor.putBoolean("default_night",true);

        }

      // 提交修改

         editor.commit();

        this.setContentView(R.layout.activity_main);
     //不行的话在跳下本页面


    }

    public void btonclick2(View view) {

        Intent intent = new Intent();

        intent.setClass(this, breakactivity.class);

        startActivity(intent);

    }

}