Thursday, January 8, 2015

RecyclerView with CheckBox Example

 Example to show Selected items with checkbox in the RecyclerView.

Step: 1
======
Create a Model class with name, emailId, isSelected variables

Student.java

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package com.pratap.cardviews1;

import java.io.Serializable;

public class Student implements Serializable {

 /**
  * 
  */
 private static final long serialVersionUID = 1L;

 private String name;

 private String emailId;

 private boolean isSelected;

 public Student() {

 }

 public Student(String name, String emailId) {

  this.name = name;
  this.emailId = emailId;

 }

 public Student(String name, String emailId, boolean isSelected) {

  this.name = name;
  this.emailId = emailId;
  this.isSelected = isSelected;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getEmailId() {
  return emailId;
 }

 public void setEmailId(String emailId) {
  this.emailId = emailId;
 }

 public boolean isSelected() {
  return isSelected;
 }

 public void setSelected(boolean isSelected) {
  this.isSelected = isSelected;
 }

}


 Step: 2
======
Now Create an Activity with Recycler with button in the xml layout file.

CardViewActivity.java


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package com.pratap.cardviews1;

import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class CardViewActivity extends AppCompatActivity {

 private Toolbar toolbar;

 private RecyclerView mRecyclerView;
 private RecyclerView.Adapter mAdapter;
 private RecyclerView.LayoutManager mLayoutManager;

 private List<Student> studentList;

 private Button btnSelection;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  toolbar = (Toolbar) findViewById(R.id.toolbar);
  btnSelection = (Button) findViewById(R.id.btnShow);

  studentList = new ArrayList<Student>();

  for (int i = 1; i <= 15; i++) {
   Student st = new Student("Student " + i, "androidstudent" + i
     + "@gmail.com", false);

   studentList.add(st);
  }

  if (toolbar != null) {
   setSupportActionBar(toolbar);
   getSupportActionBar().setTitle("Android Students");

  }

  mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);

  // use this setting to improve performance if you know that changes
  // in content do not change the layout size of the RecyclerView
  mRecyclerView.setHasFixedSize(true);

  // use a linear layout manager
  mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

  // create an Object for Adapter
  mAdapter = new CardViewDataAdapter(studentList);

  // set the adapter object to the Recyclerview
  mRecyclerView.setAdapter(mAdapter);

  btnSelection.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    String data = "";
    List<Student> stList = ((CardViewDataAdapter) mAdapter)
      .getStudentist();

    for (int i = 0; i < stList.size(); i++) {
     Student singleStudent = stList.get(i);
     if (singleStudent.isSelected() == true) {

      data = data + "\n" + singleStudent.getName().toString();
      /*
       * Toast.makeText( CardViewActivity.this, " " +
       * singleStudent.getName() + " " +
       * singleStudent.getEmailId() + " " +
       * singleStudent.isSelected(),
       * Toast.LENGTH_SHORT).show();
       */
     }

    }

    Toast.makeText(CardViewActivity.this,
      "Selected Students: \n" + data, Toast.LENGTH_LONG)
      .show();
   }
  });

 }

}


activity_main.xml


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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <include
        android:id="@+id/toolbar"
        layout="@layout/toolbar" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_margin="5dp"
        android:layout_weight="1"
        android:scrollbars="vertical" />

    <Button
        android:id="@+id/btnShow"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:text="Show Selected"
        android:background="#00796B" 
        android:textColor="@color/TextPrimaryColor"/>

</LinearLayout>

Step: 3
======

Create an Adapter for the RecyclerView and Pass the list of object to the adapter.

CardViewDataAdapter.java




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package com.pratap.cardviews1;

import java.util.List;

import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;

import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class CardViewDataAdapter extends
  RecyclerView.Adapter<CardViewDataAdapter.ViewHolder> {

 private List<Student> stList;

 public CardViewDataAdapter(List<Student> students) {
  this.stList = students;

 }

 // Create new views
 @Override
 public CardViewDataAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
   int viewType) {
  // create a new view
  View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
    R.layout.cardview_row, null);

  // create ViewHolder

  ViewHolder viewHolder = new ViewHolder(itemLayoutView);

  return viewHolder;
 }

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

  final int pos = position;

  viewHolder.tvName.setText(stList.get(position).getName());

  viewHolder.tvEmailId.setText(stList.get(position).getEmailId());

  viewHolder.chkSelected.setChecked(stList.get(position).isSelected());

  viewHolder.chkSelected.setTag(stList.get(position));

  
  viewHolder.chkSelected.setOnClickListener(new View.OnClickListener() {
   public void onClick(View v) {
    CheckBox cb = (CheckBox) v;
    Student contact = (Student) cb.getTag();

    contact.setSelected(cb.isChecked());
    stList.get(pos).setSelected(cb.isChecked());

    Toast.makeText(
      v.getContext(),
      "Clicked on Checkbox: " + cb.getText() + " is "
        + cb.isChecked(), Toast.LENGTH_LONG).show();
   }
  });

 }

 // Return the size arraylist
 @Override
 public int getItemCount() {
  return stList.size();
 }

 public static class ViewHolder extends RecyclerView.ViewHolder {

  public TextView tvName;
  public TextView tvEmailId;

  public CheckBox chkSelected;

  public Student singlestudent;

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

   tvName = (TextView) itemLayoutView.findViewById(R.id.tvName);

   tvEmailId = (TextView) itemLayoutView.findViewById(R.id.tvEmailId);
   chkSelected = (CheckBox) itemLayoutView
     .findViewById(R.id.chkSelected);

  }

 }

 // method to access in activity after updating selection
 public List<Student> getStudentist() {
  return stList;
 }

}



cardview_row.xml


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<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    card_view:cardCornerRadius="5dp"
    
    card_view:cardUseCompatPadding="true" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp" >

        <TextView
            android:id="@+id/tvName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:text="name"
            android:textColor="@android:color/black"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/tvEmailId"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/tvName"
            android:text="email"
            android:textColor="@android:color/black"
            android:textSize="18sp" />

        <CheckBox
            android:id="@+id/chkSelected"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            />
    </RelativeLayout>

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



Sample Demo
===========


















Source Code of the Project
=========
Download Link
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