Ytukyg

I Have the followin CardView

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

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

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

    xmlns:tools="http://schemas.android.com/tools"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="match_parent">



     <androidx.coordinatorlayout.widget.CoordinatorLayout

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:id="@+id/coordinatorLayout">





                <fragment

                    android:id="@+id/mapActivity"

                    android:name="com.google.android.gms.maps.SupportMapFragment"

                    android:layout_width="match_parent"

                    android:layout_height="match_parent"

                    tools:context=".Map.MyMap" />



            <androidx.cardview.widget.CardView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:layout_margin="10dp"

                android:visibility="gone"

                android:id="@+id/cardViewData"

                android:backgroundTint="@color/colorPrimary"

                app:cardCornerRadius="8dp">

    ...

Now, I call this CardView in my Activity the this way to get the id of it and pass that CardView to a worker class to handle some logic there with it (I just need to set it visible )

private CardView mCardViewData;

inside onCreate() , after setContentView

 mCardViewData = findViewById(R.id.cardViewData);

        new MapsUtils(this,mCardViewData);

As you can see , Im sending this cardview to the worker class where I get it as follow

private CardView mCardViewData;



 public MapsUtils(Context context,CardView cardView{



        this.mCardViewData = cardView;

        this.mContext = context;



    }

And then Im using it inside MapsUtil in a method like this

 private void initRun(){

        mCardViewData.setVisibility(View.VISIBLE);



    }

I need to have this cardview binded to my worker class because I manage the logic of the map in a worker class and not in the view.

Now, what I'm getting is this

java.lang.NullPointerException: Attempt to invoke virtual method
'void androidx.cardview.widget.CardView.setVisibility(int)' on a null
object reference
at com.utils.MapsUtils.initRun(MapsUtils.java:182)
at com.utils.MapsUtils.access$000(MapsUtils.java:62)
at com.utils.MapsUtils$2.onClick(MapsUtils.java:219)

Error points here

mCardViewData.setVisibility(View.VISIBLE);

And Im trying to see where Im wrong because I just defined all I need to work with that CardView in my worker class

Ok, I found the problem, the problem was that since Im using multiple constructors, the constructor that init a method that calls for the CardView was initializing it without all the elements I needed, now I binded all my elements to that constructor and its working