Android RecycleView with OnClickListener

Example of Android RecyclerView

First, add the following android support library dependency to project build.graddle file.

dependencies {
    compile 'com.android.support:recyclerview-v7:25.0.1'
    compile 'com.android.support:cardview-v7:25.0.1'
} 

First, dependency for RecyclerView and Second is for CardView. We use cardView in Recyclerview row item layout file. now use below code to your layout file

<android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/main_recyView"/>

Now go to your java class file and use below code.

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.main_recyView);

LinearLayoutManager linearLayoutManager = new 
LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);

//setting layout manager
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setNestedScrollingEnabled(false);

Here I use LinearLayoutManager and vertically scroll options. you can use another layout manager. Now create an Adapter of android RecyclerView. we also need ViewHolder Class. you can create this ViewHolder class in a separate class or in the child class of Adapter class. I create ViewHolder class in the Adapter class. in adapter class, we need two variables

1. ArrayList
2. Context

we also need android Recyclerview row item layout file. code is

<android.support.v7.widget.CardView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:elevation="10dp"
        android:padding="10dp">

        <TextView
            android:id="@+id/main_card_tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:padding="10dp"
            android:text="@string/app_name"
            android:textSize="20sp"/>

    </android.support.v7.widget.CardView>

we also need Item type class. My class name is SubjectList.java you can change your choice. SubjectList.java code is

public class SubjectList {

        private String subName;

        public SubjectList(String subName) {
            this.subName = subName;
        }

        public String getSubName() {
            return subName;
        }
    }

Now adapter class

public class MainAdapter extends    RecyclerView.Adapter<MainAdapter.MainViewHolder> {


        //Array list
        private ArrayList<SubjectList> objects;
        //context
        private Context context;

        //view holder class
        class MainViewHolder extends RecyclerView.ViewHolder {

            TextView textView;

            private MainViewHolder(View itemView) {
                super(itemView);
                textView = (TextView) itemView.findViewById(R.id.main_card_tv);
            }
        }

        //constructor
        public MainAdapter(ArrayList<SubjectList> objects, Context context) {
            this.objects = objects;
            this.context = context;
        }

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

            View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.main_card_view,parent,false);
            return new MainViewHolder(view);
        }

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

        final SubjectList list = objects.get(position);

        holder.textView.setText(list.getSubName());

        holder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                context.startActivity(new Intent(context, LocationActivity.class));
                
            }
        });
    }

    @Override
    public int getItemCount() {
        return objects.size();
    }

}

RecyclerView OnclickListener

we add a listener in onBindViewHolder method. the code here-

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

            final SubjectList list = objects.get(position);
            
            holder.textView.setText(list.getSubName());

            holder.textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    context.startActivity(new Intent(context, LocationActivity.class));
                
            }
        });
            holder.textView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    return false;
            }
        });
    }

Note: If you have multiple views in Recyclerview row item layout file you can use Card view to setOnClickListener instead of Textview.

Code analysis

ViewHolder Class-

• we make ViewHolder class extend of RecyclerView.ViewHolder
• we have on TextView and we cast it.

that’s all of ViewHolder Class. Adapter class-

• we initialize our two variables through constructor
• in onCreateViewHolder methods we create a new view type that inflates a layout file through LayoutInflater and returns new ViewHolder class with a parameter with that’s view.
• we create new SubjectList and initialize it through the position of the ArrayList item.
• add set Text to View by getting getter method of SubjectList.
• now setOnClickListener to the view
• in final we just return the size of ArrayList in getItemCount() method.

Please check next Part. Next Part cover MainActivity code Revise of all code and final screenshot. Click here.