Android switch app style, night mode

Add the Sharedpreference flag to remember the last style you chose, so you don't have to reset it the next time you start.

Package Com.zms.nightstyle;import Android.app.activity;import Android.content.context;import Android.content.sharedpreferences;import Android.content.sharedpreferences.editor;import Android.os.Bundle;    Import Android.view.view;import Android.widget.button;import Android.widget.toast;public class Main extends Activity {    Private Boolean isnight = false;    Private Button Btnset;    Private Button Btnget;    Private Sharedpreferences sharedpreferences;        @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Sharedpreferences = getsharedpreferences ("Usestyle", context.mode_world_readable);        Isnight = Sharedpreferences.getboolean ("Isnight", false);        if (isnight) {this.settheme (r.style.mythemenight);        } else {this.settheme (r.style.mythemedefault);        } setcontentview (R.layout.main);        Btnset = (Button) Findviewbyid (R.id.btnset); Btnget = (Button) Findviewbyid (r.id.btnGet);        Btnset.setonclicklistener (New Onclicklistenerimp ());    Btnget.setonclicklistener (New Onclicklistenerimp ());            } class Onclicklistenerimp implements View.onclicklistener {@Override public void OnClick (View v) {                if (v = = btnset) {Editor editor = Sharedpreferences.edit ();                    if (isnight) {setTheme (R.style.mythemedefault);                Isnight = false;                    } else {setTheme (r.style.mythemenight);                Isnight = true;                } editor.putboolean ("Isnight", isnight);                Editor.commit ();                Setcontentview (R.layout.main);                Btnset = (Button) Findviewbyid (R.id.btnset);                Btnget = (Button) Findviewbyid (r.id.btnget);                Btnset.setonclicklistener (New Onclicklistenerimp ());            Btnget.setonclicklistener (New Onclicklistenerimp ()); } else if (v = = BtngeT) {Toast.maketext (Main.this, "isnight:" + isnight, Toast.length_short). Show (); }        }    }}

Two styles of themes:

<?xml version= "1.0" encoding= "Utf-8"?><resources>    <!--default Theme--    <style name= " Mythemedefault "parent=" @android: Style/theme ">        <item name=" Btncolor "> #00ff00 </item>        < Item Name= "Mainbackground" > #ffffff </item>        <item name= "Maintextcolor" > #000000 </item>        <item name= "TextString" > Default theme </item>    </style>    <!--night Theme--    <style name = "Mythemenight" parent= "@android: Style/theme" >        <item name= "Btncolor" > #0000ff </item>        <item name= "Mainbackground" > #000000 </item>        <item name= "Maintextcolor" > #ffffff </item >        <item name= "TextString" > Night theme </item>    </style></resources>

Layout file:

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Fill_parent "android:layout_height=" fill_parent "android:background="? MainBackgrou nd "android:orientation=" vertical "> <textview android:layout_width=" fill_parent "Android:layout_ height= "Wrap_content" android:text= "TextString"/> <imageview android:id= "@+id/ivbook" Android Oid:layout_width= "62dip" android:layout_height= "42dip" android:layout_gravity= "center" android:layout _margintop= "0dip" android:gravity= "center" android:src= "? Btncolor"/> <button android:id= "@+ Id/btnset "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:layout_ma rgintop= "50DP" android:text= "Change Theme"/> <button android:id= "@+id/btnget" android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_margintop= "50DP" android:text= "Get Flag"/></linearlayout> 

Reprint Please specify source: Zhou Mushi's CSDN blogHttp://blog.csdn.net/zhoumushui 
my github: Zhou Mushi's GitHubHttps://github.com/zhoumushui

Android switch app style, night mode