[mono-android] v.FindViewById<Button>(Resource.Id.btnRemove) return null

[Asmaa Mohamed Roushdy]

I created custom datagrid activity as follow

 

[Activity(Label = "GridView", MainLauncher = true)]

    public class MyGridView : Activity

    {

        Context mContext;

        List<Quote> books = new List<Quote>();

        LitemItemAdapter mcqListAdapter;

        private List<string> symbols = new List<string>();

 

        protected override void OnCreate(Bundle savedInstanceState)

        {

            base.OnCreate(savedInstanceState);

            mContext = this;

            books.Add(new Quote("RAYA.CA", 20, 30));

            books.Add(new Quote("TMGH.CA", 30, -10));

            books.Add(new Quote("ORTE.CA", 22, 20));

 

            symbols.Add("RAYA.CA");

            symbols.Add("TMGH.CA");

            symbols.Add("ORTE.CA");

            symbols.Add("AAPL.CA");

            symbols.Add("CSI.CA");

            symbols.Add("TELE.CA");

 

            SetContentView(Resource.Layout.GridViewDesign);

 

            ArrayAdapter<string> adapter = new ArrayAdapter<string>(this,
Android.Resource.Layout.SimpleDropDownItem1Line, symbols);

            AutoCompleteTextView textView =
(AutoCompleteTextView)FindViewById(Resource.Id.stockChosser);

            textView.Adapter = adapter;

 

            ListView bookListView =
(ListView)FindViewById(Resource.Id.bookListView);

            mcqListAdapter = new LitemItemAdapter(this, books);

            bookListView.Adapter = mcqListAdapter;

 

            textView.ItemClick += new
EventHandler<ItemEventArgs>(textView_ItemClick);

        }

        void textView_ItemClick(object sender, ItemEventArgs e)

        {

            books.Add(new Quote(((TextView)e.View).Text, 10, 10));

            mcqListAdapter.NotifyDataSetChanged();

        }

    }

 

 

    class LitemItemAdapter : BaseAdapter,
Android.Views.View.IOnClickListener

    {

        Context mContext;

        List<Quote> books;

        public LitemItemAdapter(Context context, List<Quote> objects)

        {

            mContext = context;

        }

 

        public override int Count { get { return books.Count; } }

 

        public override long GetItemId(int position)

        {

            return position;

        }

 

        public override Java.Lang.Object GetItem(int position)

        {

            return books[position];

        }

 

        public override View GetView(int position, View convertView,
ViewGroup parent)

        {

            View v = convertView;

            if (v == null)

            {

                LayoutInflater vi =
(LayoutInflater)mContext.GetSystemService(Context.LayoutInflaterService);

                v = vi.Inflate(Resource.Layout.RawLayout, null);

            }

            Quote item = books[position];

            if (item != null)

            {

                TextView symbolView =
(TextView)v.FindViewById(Resource.Id.symbol);

                TextView lastPriceView =
(TextView)v.FindViewById(Resource.Id.lastPrice);

                TextView changePercView =
(TextView)v.FindViewById(Resource.Id.changePerc);

                Button removeButton =
v.FindViewById<Button>(Resource.Id.btnRemove);

 

                if (symbolView != null)

                {

                    symbolView.Text = item.getSymbol();

                }

                if (lastPriceView != null)

                {

                    lastPriceView.Text = item.getLastPrice().ToString();

                }

                if (changePercView != null)

                {

                    changePercView.Text = item.getChangePerc().ToString();

                    if (item.getChangePerc() < 0)

                    {

 
changePercView.SetTextColor(Android.Graphics.Color.Red);

                    }

                    else

                    {

 
changePercView.SetTextColor(Android.Graphics.Color.Green);

                    }

                }

                if (removeButton != null)

                {

                    removeButton.SetOnClickListener(this);

                    removeButton.Id = position;

                }

            }

            return v;

        }

 

 

 

 

        public void OnClick(View v)

        {

            books.RemoveAt(v.Id);

            NotifyDataSetChanged();

        }

    }

    public class Quote : Java.Lang.Object

    {

        private string symbol;

        private decimal lastPrice;

        private decimal changePerc;

        public Quote(string symbol, decimal lastPrice, decimal changePerc)

            : base()

        {

            this.symbol = symbol; this.lastPrice = lastPrice;
this.changePerc = changePerc;

        }

 

        public string getSymbol()

        {

            return symbol;

        }

        public void setSymbol(string symbol)

        {

            this.symbol = symbol;

        }

        public decimal getLastPrice()

        {

            return lastPrice;

        }

        public void setLastPrice(decimal lastPrice)

        {

            this.lastPrice = lastPrice;

        }

        public decimal getChangePerc()

        {

            return changePerc;

        }

        public void setChangePerc(decimal changePerc)

        {

            this.changePerc = changePerc;

        }

    }

 

RawLayout.xaml

 

<?xml version="1.0" encoding="utf-8"?>

 

<LinearLayout

  android:id="@+id/widget0"

  android:orientation="horizontal"

android:layout_height="wrap_content"

  android:layout_width="fill_parent"

  android:background="#ffffff"

  xmlns:android="http://schemas.android.com/apk/res/android"

  

 >

<Button android:layout_width="wrap_content" android:id="@+id/btnRemove"
android:text="Remove" android:layout_height="40dip"></Button>

<TextView android:id="@+id/symbol" android:layout_width="wrap_content"

                     android:layout_height="wrap_content"
android:textStyle="bold"

                     android:text=" " android:textSize="13sp"></TextView>

<TextView android:layout_width="wrap_content"

                     android:layout_height="wrap_content" android:text=" "

                     android:id="@+id/changePerc" android:textSize="13sp"
android:layout_weight="1"></TextView>

<TextView android:id="@+id/lastPrice" android:layout_width="wrap_content"
android:text=" " android:layout_height="wrap_content"></TextView>

    

</LinearLayout>

 

  

 

 

 

 

 

 

But at position = 0  btnRemove is null, why?

 

Sincerely
Asmaa Mohamed Roushdy
Team Lead
 <http://www.victoryfn.com/> Victory Finance




5 El Zohour st. 1st floor, Cairo 12311 Egypt 

Phone: +2 02 37624480, Fax: +2 02 37624490    

Mobile: +2 0144442156

 

 

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