<?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);
}
}