how to create table with columns and fill it?

Question

Hello

i would like to add for each item in listview a button but each button is placed outside

Answer 1

Hello,

You can do it by GridView in Xamarin android.

Firstly, add GirdView in your layout.

<GridView
    android:id="@+id/gridview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"       
        />

Then Open your Activity, you can find this GridView, populate the data and set the adapter of GridView. I add the header data in the List at the firstly, then other data.

public class MainActivity : AppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);
            List<classT> list1 = new List<classT>();
          //add the Grid header
            list1.Add(new classT() { elementA = "header1", elementB = "header2", numberA = "header3"            });
           //add the grid data
            for (int i = 0; i < 10; i++)
            {
                list1.Add(new classT() { elementA = "A", elementB = "B", numberA = i.ToString() });
            }
            GridView gridview = FindViewById<GridView>(Resource.Id.gridview);
            gridview.Adapter = new MyAdapter(this, list1);
        }

Next, we need to create custom adapter.

public class MyAdapter : BaseAdapter<classT>
    {
        MainActivity activity;
        List<classT> classTs;
        public MyAdapter(MainActivity activity, List<classT> classTs) : base()
        {
            this.activity = activity;
            this.classTs = classTs;
        }

       public override int Count
        {
            get { return classTs.Count; }
        }   
        public override classT this[int position]
        {
            get { return classTs[position]; }
        }
        public override long GetItemId(int position)
        {
            return 0;
        }
        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            View view;
            if (convertView == null)
            {
                // if convertView is null create a new one 
                view = activity.LayoutInflater.Inflate(Resource.Layout.griditem, null);
            }
            else
            {
                //If not, reuse it.
                view = convertView;
            }               
                          
            view.FindViewById<TextView>(Resource.Id.elementA).Text = classTs[position].elementA;
            view.FindViewById<TextView>(Resource.Id.elementB).Text = classTs[position].elementB;
            view.FindViewById<TextView>(Resource.Id.numberA).Text = classTs[position].numberA.ToString();
           return view;

       }

    }

Here is my custom grid item layout callled griditem.xml in the Layout folder. You can add other items that you want.

<?xml version="1.0" encoding="utf-8"?>   
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"   
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
    <TextView
        android:id="@+id/elementA"       
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="Cell 0"
        android:textSize="14dip" />
    <TextView
           android:id="@+id/elementB"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerHorizontal="true"
           android:text="Cell 1"
           android:textSize="14dip" />
    <TextView
         android:id="@+id/numberA"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignParentEnd="true"
           android:text="Cell 2"
           android:textSize="14dip" />
</RelativeLayout>

Please note, I change the public int numberA { get; set; } to public string numberA { get; set; } for testing in classT.

Best Regards,

Leon Lu

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