Recycler View with us picaso online image load in android dependencies HashMap adapter & View Holder

Recycler View 

with us

picaso

online image load in android dependencies

HashMap adapter & View Holder

RecyclerView is flexible and efficient version of ListView. It is an container for rendering larger data set of views that can be recycled and scrolled very efficiently.RecyclerView is like traditional ListView widget, but with more flexibility to customizes and optimized to work with larger datasets,

Picasso is an image library for Android. It's created and maintained by Square, and caters to image loading and processing. It simplifies the process of displaying images from external locations. like amazon , or other online shopping site it has by default image and than after load a main image by internet connectivity .  







for create simple RecyclerView  also add Picasso 


first add a dependencies  in app module


    // RecyclerView
    implementation 'com.android.support:recyclerview-v7:26.1.0'
   // picaso
    implementation 'com.squareup.picasso:picasso:2.3.2'


preview of add dependencies  ;-

after add both dependencies  click on sync now 

now we started with create a new activity for RecyclerView 

1.  Main Activity.xml
2. Main Activity.java
3. recyclerviewadapter.java
4. list_item.xml

1)Main Activity.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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="com.example.store.recycler.MainActivity">

    <android.support.v7.widget.RecyclerView

        android:id="@+id/recylerview"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

</LinearLayout>

preview of Main Activity.xml :-

2)Main Activity.java

package com.example.store.recycler;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    RecyclerView recylerview;

    List <HashMap<String, Object>> dataList = new ArrayList<>();

    String[] ampName = new String[]{"Niranjan", "Shivam", "vaibhav", "Shivam", "vaibhav"};

    String[] ampdesi = new String[]{"CEO", "MD", "GE","CEO", "MD",};

    String[] images = new String[]{ "http://www.freepngimg.com/download/recycle/2-2-recycle-png.png"};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        recylerview = (RecyclerView)findViewById(R.id.recylerview);

        recylerview.setLayoutManager(new LinearLayoutManager( MainActivity.this,LinearLayoutManager.VERTICAL,false));

        for (int i = 0 ; i<ampName.length ;i++){

            HashMap<String, Object> map = new HashMap<>();

            map.put("name", ampName[i]);

            map.put("designation", ampdesi[i]);

            map.put("image",images[0]);

            dataList.add(map);

        }

        recylerview .setAdapter(new recycleviewadapter( MainActivity.this,dataList));

    }

}

3)recyclerviewadapter.java

package com.example.store.recycler;

import android.content.Context;

import android.graphics.Movie;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.HashMap;

import java.util.List;

/**

 * Created by store on 23-02-2018.

 */

public class recycleviewadapter extends RecyclerView.Adapter<recycleviewadapter.MyViewHolder> {

        private List<HashMap<String,Object>> employeeList;

        Context context;

        public class MyViewHolder extends RecyclerView.ViewHolder {

            public TextView tv1 ,tv2;

            ImageView img1;

            Button btn1;

            public MyViewHolder(View view) {

                super(view);

                tv1 = (TextView) view.findViewById(R.id.tv1);

                tv2 = (TextView) view.findViewById(R.id.tv2);

                img1 = (ImageView) view.findViewById(R.id.img1);

                btn1 = (Button)view.findViewById(R.id.btn1);

            }

        }

    public recycleviewadapter(Context context  ,List<HashMap<String,Object>> employeeList) {

            this.employeeList = employeeList;

            this.context = context;

        }

        @Override

        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            View itemView = LayoutInflater.from(parent.getContext())

                    .inflate(R.layout.list_item, parent, false);

            return new MyViewHolder(itemView);

        }

        @Override

        public void onBindViewHolder(MyViewHolder holder, int position) {

            HashMap<String,Object> movie = employeeList.get(position);

            holder.tv1.setText(movie.get("name").toString());

            holder.tv2.setText(movie.get("designation").toString());

            //holder.img1.setImageResource(Integer.parseInt(movie.get("image").toString()));

            Picasso.with(context)

                    .load(movie.get("image").toString())

                    .placeholder(R.drawable.icon)

                    .error(R.drawable.icon)

                    .into(holder.img1);

                    }

        @Override

        public int getItemCount() {

            return employeeList.size();

        }

}

4)list_item.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

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

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

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:padding="10dp"

    android:orientation="vertical"

    android:descendantFocusability="blocksDescendants">

    <ImageView

        android:id="@+id/img1"

        android:layout_width="match_parent"

        android:layout_height="150dp"

        app:srcCompat="@drawable/icon" />

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        android:padding="10dp"

        android:layout_gravity="center">

    <LinearLayout

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:orientation="vertical"

       android:padding="10dp"

       android:layout_gravity="center">

    <TextView

        android:id="@+id/tv1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:text="TextView" />

    <TextView

        android:id="@+id/tv2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:text="TextView" />

    </LinearLayout>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        android:padding="10dp"

        android:layout_gravity="center">

    <Button

        android:id="@+id/btn1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="click " />

    </LinearLayout>

    </LinearLayout>

</LinearLayout>

preview of list_item.xml :-

video preview for that activity:-

thank you