這是其中一種實現模式，也是比較麻煩的一種，首先寫布局，不多說上代碼

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" tools:context="com.example.day_night_demo2.MainActivity"><Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="onClick" android:text="?attr/textContent"/><TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="100dp" android:text="Hello World!" android:textColor="?attr/textColorValue" /><TextView android:textColor="?attr/textColorValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="Hello World!" /><TextView android:textColor="?attr/textColorValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="Hello World!" /> </LinearLayout>-------------------------------------------------------------------------------------------------------

res資源文件夾下values文件夾下創建attrs.xml資源文件

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<?xml version="1.0" encoding="utf-8"?> <resources><attr name="textColorValue" format="color"></attr><attr name="textContent" format="string"></attr> </resources>

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colors.xml

<color name="background">#252a2e</color> <color name="unablebtn">#dcdcdc</color> <color name="dark_bg">#505050</color> <color name="light">#ECECEC</color> <color name="white">#FFFFFF</color> <color name="black">#000000</color> <color name="green">#05D992</color> <color name="zise">#E5004F</color> <color name="dark_bg1">#414141</color> <color name="pink">#FF5877</color> <color name="yellow">#FFFF00</color>

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Strings.xml

<string name="changge_to_night">切換成夜間模式</string> <string name="changge_to_day">切換成日間模式</string>

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styles.xml

<!-- Base application theme. 白天的模式 --> <style name="day_theme" parent="Theme.AppCompat.Light.DarkActionBar"><!-- Customize your theme here. --> <item name="colorPrimary">@color/colorPrimary</item><item name="colorPrimaryDark">@color/colorPrimaryDark</item><item name="colorAccent">@color/colorAccent</item><item name="android:windowBackground">@color/white</item><!--日間模式對應的字體顏色 和日間模式對應的文本內容--> <item name="textColorValue">@color/black</item><item name="textContent">@string/changge_to_night</item></style><!-- Base application theme. 夜晚的模式 --> <style name="night_theme" parent="Theme.AppCompat.Light.DarkActionBar"><!-- Customize your theme here. --> <item name="colorPrimary">@color/dark_bg</item><item name="colorPrimaryDark">@color/dark_bg</item><item name="colorAccent">@color/dark_bg</item><item name="android:windowBackground">@color/dark_bg</item><!--夜間模式對應的字體顏色 和夜間模式對應的文本內容--> <item name="textColorValue">@color/white</item><item name="textContent">@string/changge_to_day</item> </style>

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在res文件夾下創建anim文件夾用來存放動畫，為了使模式切換更自然，使用補間動畫

sliding_in.xml

<?xml version="1.0" encoding="utf-8"?> <alphaxmlns:android="http://schemas.android.com/apk/res/android" android:duration="1000" android:fromAlpha="0.0" android:toAlpha="1.0"></alpha>

sliding_out.xml

<?xml version="1.0" encoding="utf-8"?> <alpha xmlns:android="http://schemas.android.com/apk/res/android" android:duration="1000" android:toAlpha="0.0" android:fromAlpha="1.0"></alpha>

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下面就是具體實現代碼了

package com.example.day_night_demo2;import android.app.Activity; import android.content.Intent;/** * Created by lenovo on 2017/9/5. */ public class ThemeUtil {//我當前的主題 private static int theme = 0;//日間模式主題 private static final int DAY_THEME = 0;//夜間模式主題 private static final int NIGHT_THEME = 1;public static void onActivityCreatedSetTheme(Activity activity) {switch (theme) {case DAY_THEME:activity.setTheme(R.style.day_theme);break;case NIGHT_THEME:activity.setTheme(R.style.night_theme);break;}}//點擊按鈕改變對應的主題 public static void ChangeCurrentTheme(Activity activity) {//改變當前主題的theme變量 switch (theme) {case DAY_THEME:theme = NIGHT_THEME;break;case NIGHT_THEME:theme = DAY_THEME;break;}//重啟這個activity activity.finish();activity.overridePendingTransition(R.anim.sliding_in,R.anim.sliding_out);activity.startActivity(new Intent(activity,activity.getClass()));} }

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package com.example.day_night_demo2;import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View;public class MainActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//設置對應的主題 ，在ui創建好之后設置主題無效，所以要放到setContentView（）方法前面setTheme() ThemeUtil.onActivityCreatedSetTheme(this);setContentView(R.layout.activity_main);}public void onClick(View v){ThemeUtil.ChangeCurrentTheme(this);} }

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轉載于:https://www.cnblogs.com/powersen/p/7524584.html

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