android简单的夜间模式

现在android项目values下打

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <attr name="bookimage" format="reference|color" />
    <attr name="tvcolor" format="reference|color" />
</resources>

style.xml

<?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>

layout下activity_main

<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>

MainActivity

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);
    }
}