Implement RecyclerVIew in Android

• First you can create new project in Android Studio.
• In this you can create one more xml file and java file. Because RecyclerView  Accept only RecyclerView adapter that why we create another file for REcyclerView Apter class.  

• After that open the build,gradle(Module:app) and add the following Dependency:-

           
 compile 'com.android.support:recyclerview-v7:24.2.1'

• After that add the RecyclerView Tag into avtivity_main.xml file between the Layout Tag likew that :-

            <android.support.v7.widget.RecyclerView

    android:id="@+id/recyclerView"

    android:layout_width="match_parent"

    android:layout_height="match_parent"/>

• Open the MainActivity file and declare the RecuclerView and assign the Id to the variable.
• Now i show you the code in MainActivity.class file  following :-

public class MainActivity extends AppCompatActivity {

    //Declare object of RecyclerView    RecyclerView recyclerView;
    //Declare array to show into the RecyclerView

    String[] fruit={"Apple","Mango","Banana","Orange","Litchi","Pine Apple","Guava"};
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);  

      //connect the xml file into MainActivity       

 setContentView(R.layout.activity_main);
        //Assign the view id to the object 

       recyclerView=(RecyclerView) findViewById(R.id.recyclerView);
        //pass the array and context to the RecyclerView Adapter class 

       Second second=new Second(MainActivity.this,fruit);       
        //set the layout of the list linear list or grid list    

    recyclerView.setLayoutManager(new LinearLayoutManager(this));
        //set the data come from RecyclerView Adapter class 

        //and set it to RecyclerView object     

   recyclerView.setAdapter(second);
    }

}

• After that create an new xml file. i gave its name is second.xml. and put the following code into it :-

<LinearLayout 

xmlns:android="http://schemas.android.com/apk/res/android"  

  android:orientation="vertical"

 android:layout_width="match_parent" 

   android:layout_height="wrap_content">
    <TextView   

     android:id="@+id/txtName"       

 android:textSize="26dp"   

     android:layout_width="match_parent" 

       android:layout_height="wrap_content"
        />
</LinearLayout>

• Then Create another class file with name Second.class and put the following code into it and code description is into the code with comments:-

//extend the class with RecyclerView.Adapter<ClassName.ViewHolder>

// IN this ViewHolder is class create inside 

//the second class at the end of the curly brackets 
public class Second extends RecyclerView.Adapter<Second.ViewHolder> {

    //Declare the variables global 

       Context mContext; 

   String[] fruit;      

  // create constructor for catch the data pass by the MainActivity.java file  

   // and assign the value to global variables       

 public Second(Context mContext, String[] fruit){

        this.mContext=mContext; 

       this.fruit=fruit;
    }
    

    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        //using this class we can add xml file into this file   

     LayoutInflater layoutInflater= (LayoutInflater) 

         mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  

      View v=layoutInflater.inflate(R.layout.second,parent,false);     

   //pass the view variable to the ViewHolder Class.  

      ViewHolder viewHolder=new ViewHolder(v);

        //return ViewHolder variable;   

     return viewHolder;   

 }
    
    
    //In this method we set the values to textView with position   

 @Override    public void onBindViewHolder(ViewHolder holder, int position) {

        // holder is an object of ViewHolder without this object        

 // we can't access the txtView and can't assign the values.   

     holder.txtView.setText( fruit[position]);
    }

    
    // In this method we tell that actual size of the array     

 @Override    public int getItemCount() {
        return fruit.length; 

   }

    
    
    // In this class we can create the 

    //TextView Object and assign the id to that object   

 public class ViewHolder extends RecyclerView.ViewHolder {

        TextView txtView;      

  public ViewHolder(View itemView) {
            super(itemView);      

      txtView=(TextView)itemView.findViewById(R.id.txtName);
        }
    }
}

• Now you can run Application and you can get the following output :-

• I think it is quite easy so. keep Learning Android with ease....