An error occurred while creating and building the app. Looking at the logcat, it appears that onBindViewHolder() Method has a nullPointerError. But I can't fix it because it hasn't been long since I encountered Android. I saw other questions on this site, but I didn't understand because I don't know English well. I'd appreciate it if you could help me with how to modify it. Logcat
2020-05-25 11:54:53.613 14798-14798/? E/Zygote: accessInfo : 1
2020-05-25 11:54:53.632 14798-14798/? E/mple.oryumatzi: Unknown bits set in runtime_flags: 0x8000
2020-05-25 11:55:04.170 14798-14798/com.example.oryumatzip E/TAG: OnCreate::
2020-05-25 11:55:04.209 14798-14798/com.example.oryumatzip E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.oryumatzip, PID: 14798
java.lang.NullPointerException: Argument must not be null
at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:29)
at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:23)
at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java:669)
at com.example.oryumatzip.CustomAdapter.onBindViewHolder(CustomAdapter.java:39)
at com.example.oryumatzip.CustomAdapter.onBindViewHolder(CustomAdapter.java:17)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1627)
at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
at androidx.recyclerview.widget.RecyclerView.onMeasure(RecyclerView.java:3540)
at android.view.View.measure(View.java:26415)
at androidx.constraintlayout.widget.ConstraintLayout.internalMeasureChildren(ConstraintLayout.java:1227)
at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1572)
at android.view.View.measure(View.java:26415)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7845)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
at android.view.View.measure(View.java:26415)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7845)
at androidx.appcompat.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:403)
at android.view.View.measure(View.java:26415)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7845)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:26415)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7845)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1552)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:842)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:721)
at android.view.View.measure(View.java:26415)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7845)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:1011)
at android.view.View.measure(View.java:26415)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3605)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:2348)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2640)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2200)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8981)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:996)
at android.view.Choreographer.doCallbacks(Choreographer.java:794)
at android.view.Choreographer.doFrame(Choreographer.java:729)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:981)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
2020-05-25 11:55:04.209 14798-14798/com.example.oryumatzip E/AndroidRuntime: at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7860)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068)
MyAdapter File
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.CustomViewHolder> {
private ArrayList<ListViewItem> arrayList;
private Context context;
public CustomAdapter(ArrayList<ListViewItem> arrayList, Context context) {
this.arrayList = arrayList;
this.context = context;
}
@NonNull
@Override
public CustomViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_korean_food, parent, false);
CustomViewHolder holder = new CustomViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull CustomViewHolder holder, int position) {
Glide.with(holder.itemView)
.load(arrayList.get(position).getProfile())
.into(holder.Iv_profile);
holder.tv_title.setText(arrayList.get(position).getTitle());
holder.tv_info.setText(arrayList.get(position).getInfo());
}
@Override
public int getItemCount() {
return (arrayList != null ? arrayList.size() : 0);
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
ImageView Iv_profile;
TextView tv_title;
TextView tv_info;
public CustomViewHolder(@NonNull View itemView) {
super(itemView);
this.Iv_profile = itemView.findViewById(R.id.iv_profile);
this.tv_title = itemView.findViewById(R.id.tv_title);
this.tv_info = itemView.findViewById(R.id.tv_info);
}
}
}
XML File of RecyclerView
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".KoreanFood"
android:background="#ffffff">
<TextView
android:id="@+id/tv_koreanFood"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:height="120dp"
android:background="#ffffff"
android:fontFamily="@font/ssflowerroadregular"
android:gravity="center"
android:text="한식"
android:textSize="50sp"
app:layout_constraintBottom_toTopOf="@+id/recyclerView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_koreanFood"
app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
