added adapter and holder

app/build.gradle

@@ -26,4 +26,5 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
 }

app/src/main/java/com/example/recyclerview/MainActivity.java

@@ -1,14 +1,29 @@
 package com.example.recyclerview;
 
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 
 import android.os.Bundle;
 
+import java.util.ArrayList;
+
 public class MainActivity extends AppCompatActivity {
 
+    ArrayList<String> mData;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        mData = new ArrayList<>();
+        mData.add("eins");
+        mData.add("zwei");
+        mData.add("drei");
+
+        MyAdapter myAdapter = new MyAdapter(mData);
+        RecyclerView mRecyclerView = findViewById(R.id.recyclerView);
+        LinearLayoutManager mLinearLayoutManager = new LinearLayoutManager(this);
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
+        mRecyclerView.setAdapter(myAdapter);
     }
 }

app/src/main/java/com/example/recyclerview/MyAdapter.java

@@ -0,0 +1,38 @@
+package com.example.recyclerview;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.ArrayList;
+
+public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
+
+    ArrayList<String> mData;
+
+    public MyAdapter(ArrayList<String> aData) {
+        mData = aData;
+    }
+
+    @NonNull
+    @Override
+    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
+        View newView = inflater.inflate(R.layout.one_row_layout, parent, false);
+        MyViewHolder myViewHolder = new MyViewHolder(newView);
+        return myViewHolder;
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
+        holder.mTextView.setText(mData.get(position));
+    }
+
+    @Override
+    public int getItemCount() {
+        return mData.size();
+    }
+}

app/src/main/java/com/example/recyclerview/MyViewHolder.java

@@ -0,0 +1,15 @@
+package com.example.recyclerview;
+
+import android.view.View;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+public class MyViewHolder extends RecyclerView.ViewHolder {
+    TextView mTextView;
+    public MyViewHolder(@NonNull View itemView) {
+        super(itemView);
+        mTextView = (TextView) itemView;
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -6,13 +6,10 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/recyclerView"
+        android:layout_width="409dp"
+        android:layout_height="729dp"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
-
 </androidx.constraintlayout.widget.ConstraintLayout>