Before asking this question, I reviewed as carefully as I could the following:
Android - RecyclerView Data not showing up
RecyclerView is not showing any item
Recycler View Not Showing Anything
android recyclerview doesn't display items
I tried to follow the suggestions in the above as best as I could. However, I still have no items displayed in the RecyclerView in my application.
Below, you will find my code. Please note:
1) I included only what I thought are the relevant portions of my code
2) I am using GreenRobot EventBus to update the adapter. That's what the onEvent method comes in.
3) When running the application, all the log statements (before/after an operation) in the code below are produced. I reviewed the logcat. I could not find any related warnings/errors.
At this point, I am at a loss. I feel as if I am missing something pretty obvious/basic. I just do not know what. UI is not my specialty. I would appreciate any suggestions for resolving this problem.
Thanks,
CODE
public class MainActivity extends FragmentActivity
{
private UserLocationInformationAdapter mUserLocationInformationAdapter;
private RecyclerView recyclerView;
private ArrayList<Classes.UserLocationInformation> _mWifidetails;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.wifiData);
init();
}
private void init()
{
_mWifidetails = new ArrayList<Classes.UserLocationInformation>();
Log.i(TAG, " - init - _mWifidetails.size() - "+_mWifidetails.size());
mUserLocationInformationAdapter = new UserLocationInformationAdapter(MainActivity.this, _mWifidetails);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mUserLocationInformationAdapter);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(MainActivity.this);
recyclerView.setLayoutManager(mLayoutManager);
mUserLocationInformationAdapter.notifyDataSetChanged();
Log.i(TAG, " - init - Recycler view set up --- ");
}
@Subscribe
public void onEvent(MessageEvent event)
{
wifi_data = new ArrayList<>();
Log.i(TAG, " - onEvent - Event posted. Taking action --- ");
_mWifidetails = event.getMwifiModal();
Log.i(TAG, " - onEvent - _mWifidetails.size() - "+_mWifidetails.size());
mUserLocationInformationAdapter.notifyDataSetChanged();
Log.i(TAG, " - onEvent - Event posted. Action completed --- ");
}
public static class UserLocationInformationAdapter extends RecyclerView.Adapter<UserLocationInformationAdapter.ViewHolder>
{
private ArrayList<UserLocationInformation> mDataset;
private LayoutInflater mInflater;
private WifiDetails.ItemClickListener mClickListener;
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
public TextView ssidTV , wifiLevelTV, disTextView;
ViewHolder(View textView)
{
super(textView);
ssidTV = (TextView) textView.findViewById(R.id.ssidTV);
wifiLevelTV = (TextView) textView.findViewById(R.id.wifi_level);
disTextView = (TextView) textView.findViewById(R.id.distanceTv);
}
@Override
public void onClick(View view)
{
if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
}
}
public UserLocationInformationAdapter(Context context, ArrayList<UserLocationInformation> myDataset)
{
this.mInflater = LayoutInflater.from(context);
mDataset = myDataset;
}
@Override
public UserLocationInformationAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType)
{
TextView v = (TextView) mInflater
.inflate(R.layout.wifi_detail_adapter, parent, false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position)
{
String address = "Address: " + mDataset.get(position).address;
String latitude = "Latitude: " + mDataset.get(position).lat;
String longitude = "Longitude: " + mDataset.get(position).lon;
//SHOULD THE ABOVE THREE LINES BE REPLACED BY THESE THREE?
//String address = "Address: " + mDataset.get(mDataset.size() - 1).address;
//String latitude = "Latitude: " + mDataset.get(mDataset.size() - 1).lat;
//String longitude = "Longitude: " + mDataset.get(mDataset.size() - 1).lon;
holder.ssidTV.setText(address);
holder.wifiLevelTV.setText(latitude);
holder.disTextView.setText(longitude);
holder.ssidTV.setVisibility(View.VISIBLE);
holder.wifiLevelTV.setVisibility(View.VISIBLE);
holder.disTextView.setVisibility(View.VISIBLE);
}
@Override
public int getItemCount()
{
return mDataset.size();
}
}
}
LAYOUTS
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp">
<android.support.v7.widget.RecyclerView
android:id="@+id/wifiData"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_margin="2dp"
android:layout_marginTop="5dp"
android:layout_weight="1"
android:clickable="true"
android:splitMotionEvents="false"
android:text="User Location Information" />
</LinearLayout>
wifi_detail_adapter.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.CardView
android:id="@+id/view2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:clickable="true"
android:elevation="12dp"
app:cardCornerRadius="10dp"
android:layout_margin="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="10dp">
<TextView
android:id="@+id/ssidTV"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Address:: "/>
<TextView
android:id="@+id/wifi_level"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Latitude:: "/>
<TextView
android:id="@+id/distanceTv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Longitude:: "/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
