What is RecyclerView?
Android official site states “The RecyclerView widget is a more advanced and flexible version of ListView. This widget is a container for displaying large data sets that can be scrolled very efficiently by maintaining a limited number of views ”
RecyclerView is generally used when elements changes at run time on user action or network events
You will need
android-support-v7-recyclerview.jar for RecyclerView to integrate in your projects. This article will explain you a way to implement onItemClickListener in RecyclerView.
Lets implement RecyclerView steps by steps.
Source code is here in case you may want to skip theory or unable to find android-support-v7-recyclerview.jar
Steps 1- Create android xml layouts
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/idRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.recyclerview.MainActivity" >
</android.support.v7.widget.RecyclerView>
Steps 2- Create Activity and RecyclerView.Adapter
MainActivity.java
package com.recyclerview;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity implements OnItemRecycleViewClickListener {
RecyclerView mRecyclerView;
private String[] mData = { "Tofeeq AHmad", "Recycler View", "Layout managers for positioning items", "Default animations for common", "Tofeeq AHmad", "Recycler View",
"Layout managers for positioning items", "Default animations for common", "Tofeeq AHmad", "Recycler View", "Layout managers for positioning items",
"Default animations for common" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.idRecyclerView);
LinearLayoutManager mLinearManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLinearManager);
// StaggeredGridLayoutManager mStaggeredGridLayoutManager = new StaggeredGridLayoutManager(1, StaggeredGridLayoutManager.HORIZONTAL);
// mRecyclerView.setLayoutManager(mStaggeredGridLayoutManager);
//
// GridLayoutManager mGridLayoutManager = new GridLayoutManager(this, 2, GridLayoutManager.VERTICAL, false);
// mRecyclerView.setLayoutManager(mGridLayoutManager);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setAdapter(new RecyclerAdapter(mData, this));
}
@Override
public void onItemClicked(int position, RecyclerAdapter mAdapter) {
Toast.makeText(this, String.valueOf(position), Toast.LENGTH_LONG).show();
}
}
RecyclerAdapter.java
package com.recyclerview;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private String[] mDataset;
OnItemRecycleViewClickListener mOnItemRecycleViewClickListener;
public RecyclerAdapter(String[] myDataset, OnItemRecycleViewClickListener mOnItemRecycleViewClickListener) {
mDataset = myDataset;
this.mOnItemRecycleViewClickListener = mOnItemRecycleViewClickListener;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView mTextView;
public ImageView mImageView;
public ViewHolder(View v) {
super(v);
mTextView = (TextView) v.findViewById(R.id.txt1);
mImageView = (ImageView) v.findViewById(R.id.imageView);
}
}
@Override
public int getItemCount() {
return mDataset.length;
}
@Override
public void onBindViewHolder(ViewHolder arg0, int arg1) {
arg0.mTextView.setText(mDataset[arg1]);
arg0.itemView.setTag(arg1);
arg0.itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mOnItemRecycleViewClickListener.onItemClicked(Integer.parseInt(v.getTag().toString()), RecyclerAdapter.this);
}
});
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int arg1) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
}
Steps 3- To Implment onItemClickListener create one interface and attach it with adapter. RecyclerAdapter adapter already have this attach with it in step 2.
package com.recyclerview;
public interface OnItemRecycleViewClickListener {
public void onItemClicked(int position, RecyclerAdapter mAdapter);
}
