Implementation of Android Night mode

Package Com.loaderman.daynightdemo;import Android.os.bundle;import android.support.v7.app.AppCompatActivity; Import Android.support.v7.app.appcompatdelegate;import Android.support.v7.widget.toolbar;import Android.view.View ;p ublic class Mainactivity extends Appcompatactivity implements View.onclicklistener {{appcompatdelegate.setde    Faultnightmode (Appcompatdelegate.mode_night_auto);        } @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Toolbar Toolbar = (Toolbar) Findviewbyid (R.id.toolbar);        Setsupportactionbar (toolbar);        Findviewbyid (R.id.btn_auto). Setonclicklistener (this);        Findviewbyid (R.id.btn_day). Setonclicklistener (this);        Findviewbyid (r.id.btn_night). Setonclicklistener (this);    Findviewbyid (R.id.fab). Setonclicklistener (this); } @Override public void OnClick (View v) {switch (V.getid ()) {R.ID.BTN_auto: {getdelegate (). Setlocalnightmode (Appcompatdelegate.mode_night_auto);                Recreate ();            Break                } case R.id.btn_day: {getdelegate (). Setlocalnightmode (Appcompatdelegate.mode_night_no);                Recreate ();            Break                } case r.id.btn_night: {getdelegate (). Setlocalnightmode (Appcompatdelegate.mode_night_yes);                Recreate ();            Break }        }    }}

 activity_main.xml

<?xml version= "1.0" encoding= "Utf-8"? ><android.support.design.widget.coordinatorlayout 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 "Androi D:fitssystemwindows= "true" tools:context= "com.yanzhenjie.daynight.MainActivity" > < Android.support.design.widget.AppBarLayout android:layout_width= "match_parent" android:layout_height= "Wrap_c Ontent "Android:theme=" @style/apptheme.appbaroverlay "> <android.support.v7.widget.toolbar A Ndroid:id= "@+id/toolbar" android:layout_width= "match_parent" android:layout_height= "? Attr/actionBarS Ize "android:background="? Attr/colorprimary "App:popuptheme=" @style/apptheme.popupoverlay "/> & Lt;/android.support.design.widget.appbarlayout> <include Layout= "@layout/content_main"/> <android.support.design.widget.floatingactionbutton android:id= "@+id/fab" Android:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_gravity= "Botto M|end "android:layout_margin=" @dimen/fab_margin "android:src=" @android:d rawable/ic_dialog_email "/></an Droid.support.design.widget.coordinatorlayout>

 content_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 "Andro Id:layout_width= "Match_parent" android:layout_height= "match_parent" android:orientation= "vertical" Android:paddin gbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_horizontal_margin" Android: paddingright= "@dimen/activity_horizontal_margin" android:paddingtop= "@dimen/activity_vertical_margin" app:layout _behavior= "@string/appbar_scrolling_view_behavior" tools:context= "com.yanzhenjie.daynight.MainActivity" Tools: showin= "@layout/activity_main" > <button android:id= "@+id/btn_auto" android:layout_width= "Match_pare NT "android:layout_height=" Wrap_content "android:text=" Auto mode "/> <button android:id=" @+id/btn       _day "android:layout_width=" Match_parent " android:layout_height= "Wrap_content" android:text= "daytime mode"/> <button android:id= "@+id/btn_night" Android:layout_width= "Match_parent" android:layout_height= "Wrap_content" android:text= "Night Mode"/></ Linearlayout>

Style.xml

<resources>    <style name= "Apptheme" parent= "Theme.AppCompat.DayNight.DarkActionBar" >        <item Name= "Colorprimary" > @color/colorprimary</item>        <item name= "Colorprimarydark" > @color/ colorprimarydark</item>        <item name= "coloraccent" > @color/coloraccent</item>    </style >    <style name= "Apptheme.noactionbar" >        <item name= "Windowactionbar" >false</item>        <item name= "Windownotitle" >true</item>    </style>    <style name= " Apptheme.appbaroverlay "parent=" ThemeOverlay.AppCompat.Dark.ActionBar "/>    <style name=" Apptheme.popupoverlay "parent=" ThemeOverlay.AppCompat.Light "/></resources>

Androidmainfest.xml

<?xml version= "1.0" encoding= "Utf-8"? ><manifest xmlns:android= "http://schemas.android.com/apk/res/ Android "    package=" Com.loaderman.daynightdemo ">    <application        android:allowbackup=" true "        android:icon= "@mipmap/ic_launcher"        android:label= "@string/app_name"        android:supportsrtl= "true"        Android:theme= "@style/apptheme" >        <activity            android:name= ". Mainactivity "            android:label=" @string/app_name "            android:theme=" @style/apptheme.noactionbar ">            <intent-filter>                <action android:name= "Android.intent.action.MAIN"/>                <category android: Name= "Android.intent.category.LAUNCHER"/>            </intent-filter>        </activity>    </ Application></manifest>

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Implementation of Android Night mode