My Recyclerview is not showing anything

Question

I want to display Items from the mysql database to my recyclerview but I dont know why it is not displaying anything

Recyclerview

Answer 1

Try this code .. make one method for set adapter..

    private void setAdapter(){
    if (likelyProblemAdapter==null){
        if (!mlikelyProblems.isEmpty()) {
            likelyProblemAdapter = new LikelyProblemAdapter(mlikelyProblems, this);
            mRecyclerView.setAdapter(likelyProblemAdapter);
        }
    }
    else{
        likelyProblemAdapter.notifyDataSetChanged();

    }
}

this method define after getting all data like this way..

 try {
            JSONArray jsonArray = new JSONArray(response);
            for (int i=0; i<=jsonArray.length()-1; i++){
                JSONObject likelyProblemJson = jsonArray.getJSONObject(i);
                likelyProblem = likelyProblemJson.getString("problems");
                LikelyProblems likelyProblems = new LikelyProblems(likelyProblem);
                mlikelyProblems.add(likelyProblems);
                mRecyclerView.setAdapter(likelyProblemAdapter);
            }
          setAdapter();

        } catch (JSONException e) {
            e.printStackTrace();
        }

Answer 2

Issue no 1 :- set adapter outside the loop

Issue no 2 :- you forgot to notify your likelyProblemAdapter after adding new data in your mlikelyProblems

Issue no 3 :- layout

Try this

  for (int i=0; i<=jsonArray.length()-1; i++){
                        JSONObject likelyProblemJson = jsonArray.getJSONObject(i);
                        likelyProblem = likelyProblemJson.getString("problems");
                        LikelyProblems likelyProblems = new LikelyProblems(likelyProblem);
                        mlikelyProblems.add(likelyProblems);
                       
                    }

     mRecyclerView.setAdapter(likelyProblemAdapter);\
     likelyProblemAdapter.notifyDataSetChanged();

Change your layout like this

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_likely_problems"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/zerodimen"
android:paddingLeft="@dimen/zerodimen"
android:paddingRight="@dimen/zerodimen"
android:paddingTop="@dimen/zerodimen"
android:background="@color/colorBackground"
android:orientation="vertical"
tools:context="com.example.system2.tranxav.LIkelyProblemsActivity">
<android.support.v7.widget.Toolbar
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/toolbar"
    android:background="@color/background" />

<android.support.v4.widget.SwipeRefreshLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/likelyProblemSwipeToRefresh">   

      <android.support.v7.widget.RecyclerView
    android:layout_below="@id/toolbar"
    android:id="@+id/likelyProblemRecyclerView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
  
</android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

Answer 3

Hope so its work for you

try{
        JSONArray jsonArray = new JSONArray(response);
        for (int i = 0; i <= jsonArray.length() - 1; i++) {
            JSONObject likelyProblemJson = jsonArray.getJSONObject(i);
            likelyProblem = likelyProblemJson.getString("problems");
            LikelyProblems likelyProblems = new LikelyProblems(likelyProblem);
            mlikelyProblems.add(likelyProblems);
        }
    } catch(
    JSONException e)

    {
        e.printStackTrace();
    } 
    mRecyclerView.setAdapter(likelyProblemAdapter);
    likelyProblemAdapter.notifyDataSetChanged();

Answer 4

1. Change xml (SwipeRefreshLayout currently hide your recycleview):

2. set adapter outside the loop: mRecyclerView.setAdapter(likelyProblemAdapter);

Answer 5

Move setAdapter outside of for loop. And then call notifyDataSetChanged.

@Override
    public void onResponse(String response) {
        Log.i("info", response);
        try {
            JSONArray jsonArray = new JSONArray(response);
            for (int i=0; i<=jsonArray.length()-1; i++){
                JSONObject likelyProblemJson = jsonArray.getJSONObject(i);
                likelyProblem = likelyProblemJson.getString("problems");
                LikelyProblems likelyProblems = new LikelyProblems(likelyProblem);
                mlikelyProblems.add(likelyProblems);
            }

            mRecyclerView.setAdapter(likelyProblemAdapter);
            likelyProblemAdapter.notifyDataSetChanged();

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

Remove likelyProblemAdapter.notifyDataSetChanged(); from onCreate.

Also update your Layout move Recycler View inside SwipeRefreshLayout.

Like

<android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/likelyProblemSwipeToRefresh"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/likelyProblemRecyclerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/toolbar" />

 </android.support.v4.widget.SwipeRefreshLayout>