Android Studio Hedgehog | 2023.1.1
Note: For personal reference using RecyclerView and Fragment
Create new Project (No Activity)
Name Recycler View Tutorial
Package Name com.dedetok.recyclerviewtutorial
Create Activity -> Empty View Activity
Activity Name: Main Activity
Layout Name activity_main
Laucher Activity checked
build.gradle.kts(Module :app)
plugins {
id("com.android.application")
}
android {
namespace = "com.dedetok.recyclerviewtutorial"
compileSdk = 34
defaultConfig {
applicationId = "com.dedetok.recyclerviewtutorial"
minSdk = 24
targetSdk = 34
versionCode = 1
versionName = "1.0"
,,,
Layout
activity_main.xml
<?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"
tools:context=".MainActivity">
<androidx.fragment.app.FragmentContainerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id = "@+id/frag_container"/>
</androidx.constraintlayout.widget.ConstraintLayout>
my_single_column.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="72dp"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/first_column" />
</androidx.appcompat.widget.LinearLayoutCompat>
my_recycler_view_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id = "@+id/r_view_main_layout"/>
</androidx.appcompat.widget.LinearLayoutCompat>
Java
MyAdapter.java
package com.dedetok.recyclerviewtutorial;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
public class MyAdapter extends RecyclerView.Adapter {
private String[] mDataSet;
// constructor
public MyAdapter(String[] mDataSet) {
this.mDataSet = mDataSet;
}
@NonNull
@Override
//public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { // Original
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
// Create a new view.
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_single_column, parent, false);
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
((MyViewHolder) holder).getTextView().setText(mDataSet[position]);
}
@Override
public int getItemCount() {
return mDataSet.length;
}
///////////////////
/*
* class MyViewHolder extends from RecyclerView.ViewHolder {
*/
private class MyViewHolder extends RecyclerView.ViewHolder {
private final TextView textView;
public MyViewHolder(View v) {
super(v);
v.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("Element " + getAdapterPosition() + " clicked.");
}
});
textView = (TextView) v.findViewById(R.id.first_column);
}
public TextView getTextView() {
return textView;
}
}
//////////////////
}
RecyclerViewFragment.java
package com.dedetok.recyclerviewtutorial;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
public class RecyclerViewFragment extends Fragment {
// initial data
String[] mDataSet = {"ace", "boom", "crew", "dog", "eon"};
protected RecyclerView mRecyclerView;
protected MyAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.my_recycler_view_layout, container, false); // conteain androidx.recyclerview.widget.RecyclerView
// get androidx.recyclerview.widget.RecyclerView
mRecyclerView = rootView.findViewById(R.id.r_view_main_layout);
// Define Layout for androidx.recyclerview.widget.RecyclerView
LinearLayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyAdapter(mDataSet);
// Set CustomAdapter as the adapter for RecyclerView.
mRecyclerView.setAdapter(mAdapter);
// END_INCLUDE(initializeRecyclerView)
return rootView;
}
}
MainActivity.java
package com.dedetok.recyclerviewtutorial;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
RecyclerViewFragment fragment = new RecyclerViewFragment();
transaction.replace(R.id.frag_container, fragment);
transaction.commit();
}
}
}
