Someone can help me with this error I do not know what it is about !!! The complete project is on github:
E / AndroidRuntime: FATAL EXCEPTION: main Process: com.example.austin.app_doc, PID: 14766 java.lang.NullPointerException: Attempt to read from field 'android.view.View android.support.v7.widget.RecyclerView $ ViewHolder.itemView 'on a null object reference at android.support.v7.widget.RecyclerView $ Adapter.createViewHolder (RecyclerView.java:6795) at android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline (RecyclerView.java:5975) at android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition (RecyclerView.java:5858) at android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition (RecyclerView.java:5854) at android.support.v7.widget.LinearLayoutManager $ LayoutState.next (LinearLayoutManager.java:2230) at android.support.v7.widget.LinearLayoutManager.layoutChunk (LinearLayoutManager.java:1557) at android.support.v7.widget.LinearLayoutManager.fill (LinearLayoutManager.java:1517) at android.support.v7.widget.LinearLayoutManager.onLayoutChildren (LinearLayoutManager.java:612) at android.support.v7.widget.RecyclerView.dispatchLayoutStep2 (RecyclerView.java:3924) at android.support.v7.widget.RecyclerView.dispatchLayout (RecyclerView.java:3641) at android.support.v7.widget.RecyclerView.onLayout (RecyclerView.java:4194) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.support.constraint.ConstraintLayout.onLayout (ConstraintLayout.java:1915) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.widget.FrameLayout.layoutChildren (FrameLayout.java:325) at android.widget.FrameLayout.onLayout (FrameLayout.java:261) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.support.v7.widget.ActionBarOverlayLayout.onLayout (ActionBarOverlayLayout.java:444) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.widget.FrameLayout.layoutChildren (FrameLayout.java:325) at android.widget.FrameLayout.onLayout (FrameLayout.java:261) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.widget.LinearLayout.setChildFrame (LinearLayout.java:1816) at android.widget.LinearLayout.layoutVertical (LinearLayout.java:1660) at android.widget.LinearLayout.onLayout (LinearLayout.java:1569) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.widget.FrameLayout.layoutChildren (FrameLayout.java:325) at android.widget.FrameLayout.onLayout (FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout (DecorView.java:888) at android.view.View.layout (View.java:19781) at android.view.ViewGroup.layout (ViewGroup.java:6144) at android.view.ViewRootImpl.performLayout (ViewRootImpl.java:2674) at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2377) at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1515) at android.view.ViewRootImpl $ TraversalRunnable.run (ViewRootImpl.java:7266) at android.view.Choreographer $ CallbackRecord.run (Choreographer.java:981) at android.view.Choreographer.doCallbacks (Choreographer.java:790) at android.view.Choreographer.doFrame (Choreographer.java:721) at android.view.Choreographer $ FrameDisplayEventReceiver.run (Choreographer.java:967) at android.os.Handler.handleCallback (Handler.java:808) at android.os.Handler.dispatchMessage (Handler.java:101) at android.os.Looper.loop (Looper.java:166) at android.app.ActivityThread.main (ActivityThread.java:7425) at java.lang.reflect.Method.invoke (Native Method) at com.android.internal.os.Zygote $ MethodAndArgsCaller.run (Zygote.java:245) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:921)
This is the code of my Adapter :
package com.example.austin.app_doc;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
public class GrpAdaptador extends RecyclerView.Adapter<GrpAdaptador.myViewHolder>{
Context mContext;
List<GrpItem> mDate;
public GrpAdaptador(Context mContext, List<GrpItem> mDate) {
this.mContext = mContext;
this.mDate = mDate;
}
@NonNull
@Override
public myViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View view = inflater.inflate(R.layout.item_grp, viewGroup, false);
return null;
}
@Override
public void onBindViewHolder(@NonNull myViewHolder myViewHolder, int i) {
myViewHolder.grpEsc.setImageResource(mDate.get(i).getGrpEsc());
myViewHolder.grpName.setText(mDate.get(i).getGrpName());
}
@Override
public int getItemCount() {
return mDate.size();
}
public class myViewHolder extends RecyclerView.ViewHolder{
ImageView grpEsc;
TextView grpName;
public myViewHolder(View itemView){
super(itemView);
grpEsc = itemView.findViewById(R.id.grpEsc);
grpName = itemView.findViewById(R.id.grpDesc);
}
}
}