When I open a Fragment I try to show a ProgressBar, populate a RecyclerView, update NotifyChange to RecyclerView and then hide the ProgressBar.
Right now the ProgressBar isn't spinning. I think it has to do with SetRecyclerViewItems being executed on the UI Thread but if I don't do that I get an error saying that the UI can only be updated in the UI thread.
Fragment:
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
/* Initializing elements code removed */
SetRecyclerView();
return view;
}
public async override void OnStart()
{
base.OnStart();
ShowProgressBar();
await LoadAsync();
HideProgressBar();
}
private async Task LoadAsync()
{
await Task.Run(() => {
SetRecyclerViewItems();
});
}
private void SetRecyclerView()
{
mLayoutManager = new LinearLayoutManager(mRecyclerView.Context);
mRecyclerView.SetLayoutManager(mLayoutManager);
mAdapter = new TransactionsRecyclerAdapter(this.Activity, mTransactions, dateFormat);
mAdapter.ItemClick += MAdapter_ItemClick;
mRecyclerView.SetAdapter(mAdapter);
}
private void SetRecyclerViewItems(List<PaymentListItemViewModel> transactions = null)
{
Activity.RunOnUiThread(() => {
if (transactions == null)
transactions = GetTransactions();
mAdapter.NotifyChange(transactions);
SetTotal();
});
}
Adapter.NotifyChange
public void NotifyChange(List<PaymentListItemViewModel> transactions)
{
mTransactions = transactions;
NotifyDataSetChanged();
}
Why isn't the ProgressBar spinning?
Is the way I'm populating new data to the Adapter correct (sending in a new list and then NotifyDataSetChanged?
Layout:
<?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"
android:background="@drawable/login_background">
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:gravity="center"
android:layout_centerInParent="true"
android:id="@+id/transactionsProgressBar">
<ProgressBar
android:layout_height="wrap_content"
android:layout_width="wrap_content"
style="@android:style/Widget.ProgressBar.Large" />
</RelativeLayout>
<LinearLayout
android:orientation="vertical"
android:minWidth="25px"
android:minHeight="25px"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/linearLayout4"
android:layout_weight="1">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerViewTransactions"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:scrollbars="vertical" />
</LinearLayout>
</LinearLayout>
In OnCreateView:
mLayoutProgressBar = view.FindViewById<RelativeLayout>(Resource.Id.transactionsProgressBar);
Show/Hide ProgressBar:
private void ShowProgressBar()
{
mLayoutProgressBar.Visibility = ViewStates.Visible;
}
private void HideProgressBar()
{
mLayoutProgressBar.Visibility = ViewStates.Gone;
}
