EditText fire focus event inside RecycleView - xamarin.android

Question

I have a EditText field inside a RecycleView.
When I add the OnFocusChange event listener the event doesn't fire when the text box receive focus.

Answer 1

When I add the OnFocusChange event listener the event doesn't fire when the text box receive focus.
You could set the OnFocusChangeListener in the OnBindViewHolder() method in the adapter.
For example:
public class MainActivity : AppCompatActivity
{
RecyclerView mRecyclerView;
RecyclerView.LayoutManager mLayoutManager;
MyAdapter mAdapter;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.activity_main);
mRecyclerView = FindViewById<RecyclerView>(Resource.Id.recyclerView);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.SetLayoutManager(mLayoutManager);
mAdapter = new MyAdapter(this);
mRecyclerView.SetAdapter(mAdapter);
}
public class MyViewHolder : RecyclerView.ViewHolder
{
public EditText Box1 { get; private set; }
public EditText Box2 { get; private set; }
public MyViewHolder(View itemView)
: base(itemView)
{
Box1 = itemView.FindViewById<EditText>(Resource.Id.Box1);
Box2 = itemView.FindViewById<EditText>(Resource.Id.Box2);
}
}
public class MyAdapter : RecyclerView.Adapter
{
Context context;
public MyAdapter(Context context)
{
this.context = context;
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
View itemView = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.RecyclerItem, parent, false);
MyViewHolder vh = new MyViewHolder(itemView);
return vh;
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
MyViewHolder vh = holder as MyViewHolder;
var box1 = vh.ItemView.FindViewById<EditText>(Resource.Id.Box1);
box1.OnFocusChangeListener = new MyOnFocusChangeListener(context);
}
public override int ItemCount
{
get { return 4; }
}
}
public class MyOnFocusChangeListener : Java.Lang.Object, IOnFocusChangeListener
{
Context context;
public MyOnFocusChangeListener(Context context)
{
this.context = context;
}
public void OnFocusChange(View v, bool hasFocus)
{
Toast.MakeText(context, "FocusChanged", ToastLength.Short).Show();
}
}
}
And the xaml of recyclerview item:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="#+id/Box1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="ABC"
android:textAlignment="center" />
<EditText
android:id="#+id/Box2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="DEF"
android:textAlignment="center" />
</LinearLayout>