Xamarin.android Getting Started: ListView and Adapter

First, Introduction

No matter what software is developed, the use of the list is essential, and this chapter will learn how to use Xamarin to implement it, and how to use a custom adapter. The basics and adapters for the ListView in Xamarin can be viewed on the official website Https://developer.xamarin.com/guides/android/user_interface/working_ with_listviews_and_adapters/ This chapter mainly describes if you display multiple data in a ListView item.

Ii. preparatory work

1. Create an Android project named Mylistview

2. Create a new 2 view file

3. Edit our attempt below:

Copy and replace the following code into Stuadapter

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"android:orientation= "vertical"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:minwidth= "25px"Android:minheight= "25px">    <LinearLayoutandroid:orientation= "Horizontal"Android:layout_width= "Match_parent"Android:layout_height= "30.5DP"Android:id= "@+id/linearlayout1">        <TextViewAndroid:text= "Name:"Android:layout_width= "Wrap_content"Android:layout_height= "Match_parent"Android:id= "@+id/textview1" />        <TextViewAndroid:text= "Text"Android:layout_width= "Wrap_content"Android:layout_height= "Match_parent"Android:id= "@+id/name" />    </LinearLayout>    <LinearLayoutandroid:orientation= "Horizontal"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:id= "@+id/linearlayout2">        <TextViewAndroid:text= "Age:"Android:layout_width= "Wrap_content"Android:layout_height= "Match_parent"Android:id= "@+id/textview3" />        <TextViewAndroid:text= "Text"Android:layout_width= "Wrap_content"Android:layout_height= "Match_parent"Android:id= "@+id/age" />    </LinearLayout></LinearLayout>

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Copy and replace the following code into Studentlist

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"android:orientation= "vertical"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:minwidth= "25px"Android:minheight= "25px">    <ListViewAndroid:minwidth= "25px"Android:minheight= "25px"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:id= "@+id/stlist" /></LinearLayout>

View Code

4. Create a new activity named Studentslist, the new 2 classes are named info and Stuadapter, you can start coding below.

Third, binding data

1. First we need a container to store the data we need, so we add the following code to info

    Public class Info:Java.Lang.Object    {        publicstringgetset;} // define student names         Public int Get set; }// define Student age    }

View Code

2. With the container, we now need to bind our data binding to the adapter, so we customize an adapter to add the following code

  Public classStuadapter:baseadapter {List<Info>Stuitems;        Activity Con; PrivateLayoutinflater Minflater;  PublicStuadapter (Activity context,list<info>items) {             This. Stuitems = items;//get the data passed in.             This. Con =context;  This. Minflater =Layoutinflater.from (context); }         Public Override intCount {Get            {                returnStuitems.count; }        }         Public OverrideJava.Lang.Object GetItem (intposition) {            returnStuitems[position]; }         Public Override LongGetitemid (intposition) {            return 0; }        /// <summary>        ///The most central approach/// </summary>        /// <param name= "position" ></param>        /// <param name= "Convertview" ></param>        /// <param name= "parent" ></param>        /// <returns></returns>         Public OverrideView GetView (intposition, View Convertview, ViewGroup parent)            {Stuview Stuview; if(Convertview = =NULL) {Stuview=NewStuview (); //The view where we want to fit the controlConvertview = Minflater.inflate (Resource.Layout.StuAdapter,NULL); //Bound ControlStuview.name = convertview.findviewbyid<textview>(Resource.Id.name); Stuview.age= convertview.findviewbyid<textview>(Resource.Id.age); //set the text to be displayed by the controlStuview.name.Text =Stuitems[position].                Name; Stuview.age.Text=Stuitems[position].                Age.tostring (); Convertview.tag=Stuview; }            Else{Stuview=(Stuview) Convertview.tag; }            returnConvertview; }        //define a container to hold the control, note to inherit the Javaobject         Public classStuView:Java.Lang.Object { PublicTextView name;  PublicTextView age; }    }

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3. Below we can bind the list, add the following code to the Studentslist activity

  Public classstudentslist:activity { PublicList<info> item;//Define a list         PublicListView ListView;//Defining Controls         PublicStuadapter adapter;//defining a data source        protected Override voidOnCreate (Bundle savedinstancestate) {Base.            OnCreate (savedinstancestate); Setcontentview (Resource.Layout.StudentsList);//set the view to displayadddate (); ListView= Findviewbyid<listview> (Resource.Id.StList);//Locate the controladapter =NewStuadapter ( This, item);//Binding AdapterListview. Adapter = Adapter;//set the data source for the ListView to adapter        }        /// <summary>        ///Add Data/// </summary>         Public voidadddate () {//Add three dataInfo info =NewInfo {Name ="Zhang San", age = + }; Info Info1=NewInfo {Name ="John Doe", age = - }; Info Info2=NewInfo {Name ="Wang er", age = - }; Item=NewList<info>(); Item.            ADD (info); Item.            ADD (INFO1); Item.        ADD (Info2); }    }

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4. Finally, in our mainactivity activity, rewrite the button's click event to jump to the studentslist and OK.

New Intent (); Intent. SetClass (thistypeof(studentslist)); StartActivity (intent);

5.

Xamarin.android Getting Started: ListView and Adapter