Showing posts with label RecyclerView OnScrollListener. Show all posts
Showing posts with label RecyclerView OnScrollListener. Show all posts

Wednesday, 17 June 2015

LoadMore RecyclerView with progress bar showing at bottom


Update to My Last Post.

I am trying to get Endless RecyclerView with progress bar showing at bottom when you are loading data from  web service. But faced different problems.
May be some one needs this.

My StackOverflow answer. Plesae upvote my answer. if it is helpful in your project.
http://stackoverflow.com/questions/31000964/how-to-implement-setonscrolllistener-in-recyclerview/31178493#31178493
I want to show complete example on this.


 Step: 1
======
Create a new Interface


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public interface OnLoadMoreListener {
  void onLoadMore();
}

Step: 2
======
Create a new Model Object Name Student.java


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package com.pratap.endlessrecyclerview;

import java.io.Serializable;

public class Student implements Serializable {

    private static final long serialVersionUID = 1L;

    private String name;

    private String emailId;

 public Student() {

    }
    public Student(String name, String emailId) {
        this.name = name;
        this.emailId = emailId;
    }

    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;
    }


}



Step: 3
======

Create a new Activity with Recyclerview in the Xml Layout.



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package com.pratap.endlessrecyclerview;

import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Toolbar toolbar;

    private TextView tvEmptyView;
    private RecyclerView mRecyclerView;
    private DataAdapter mAdapter;
    private LinearLayoutManager mLayoutManager;

    private List<Student> studentList;


    protected Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        tvEmptyView = (TextView) findViewById(R.id.empty_view);
        mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
        studentList = new ArrayList<Student>();
        handler = new Handler();
        if (toolbar != null) {
            setSupportActionBar(toolbar);
            getSupportActionBar().setTitle("Android Students");

        }

        loadData();

        // 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);

        mLayoutManager = new LinearLayoutManager(this);

        // use a linear layout manager
        mRecyclerView.setLayoutManager(mLayoutManager);

        // create an Object for Adapter
        mAdapter = new DataAdapter(studentList, mRecyclerView);

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


        if (studentList.isEmpty()) {
            mRecyclerView.setVisibility(View.GONE);
            tvEmptyView.setVisibility(View.VISIBLE);

        } else {
            mRecyclerView.setVisibility(View.VISIBLE);
            tvEmptyView.setVisibility(View.GONE);
        }

        mAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void onLoadMore() {
                //add null , so the adapter will check view_type and show progress bar at bottom
                studentList.add(null);
                mAdapter.notifyItemInserted(studentList.size() - 1);

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        //   remove progress item
                        studentList.remove(studentList.size() - 1);
                        mAdapter.notifyItemRemoved(studentList.size());
                        //add items one by one
                        int start = studentList.size();
                        int end = start + 20;

                        for (int i = start + 1; i <= end; i++) {
                            studentList.add(new Student("Student " + i, "AndroidStudent" + i + "@gmail.com"));
                            mAdapter.notifyItemInserted(studentList.size());
                        }
                        mAdapter.setLoaded();
                       //or you can add all at once but do not forget to call mAdapter.notifyDataSetChanged();
                    }
                }, 2000);

            }
        });

    }


    // load initial data
    private void loadData() {

        for (int i = 1; i <= 20; i++) {
            studentList.add(new Student("Student " + i, "androidstudent" + i + "@gmail.com"));

        }


    }


}



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:fitsSystemWindows="true"
    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" />


    <TextView
        android:id="@+id/empty_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="No Records"
        android:visibility="gone" />


</LinearLayout>



Create a row for recyclerview

list_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="match_parent"
        android:background="?android:selectableItemBackground">

        <TextView
            android:id="@+id/tvName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            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:layout_margin="5dp"
            android:text="Email Id"
            android:textColor="@android:color/black"
            android:textSize="12sp" />
    </RelativeLayout>

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


create a progress bar to show at the bottom.

progressbar_item.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="wrap_content"    android:orientation="vertical" >
 
    <ProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="wrap_content"
         android:layout_gravity="center_horizontal"
        android:layout_height="wrap_content" />

</LinearLayout>


Step: 4
======

Create an Adapter Class for RecyclerView


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package com.pratap.endlessrecyclerview;

import android.support.v7.widget.LinearLayoutManager;
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.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class DataAdapter extends RecyclerView.Adapter {
 private final int VIEW_ITEM = 1;
 private final int VIEW_PROG = 0;

 private List<Student> studentList;

 // The minimum amount of items to have below your current scroll position
 // before loading more.
 private int visibleThreshold = 5;
 private int lastVisibleItem, totalItemCount;
 private boolean loading;
 private OnLoadMoreListener onLoadMoreListener;

 

 public DataAdapter(List<Student> students, RecyclerView recyclerView) {
  studentList = students;

  if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) {

   final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView
     .getLayoutManager();


     recyclerView
     .addOnScrollListener(new RecyclerView.OnScrollListener() {
      @Override
      public void onScrolled(RecyclerView recyclerView,
              int dx, int dy) {
       super.onScrolled(recyclerView, dx, dy);

       totalItemCount = linearLayoutManager.getItemCount();
       lastVisibleItem = linearLayoutManager
         .findLastVisibleItemPosition();
       if (!loading
         && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
        // End has been reached
        // Do something
        if (onLoadMoreListener != null) {
         onLoadMoreListener.onLoadMore();
        }
        loading = true;
       }
      }
     });
  }
 }

 @Override
 public int getItemViewType(int position) {
  return studentList.get(position) != null ? VIEW_ITEM : VIEW_PROG;
 }

 @Override
 public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
   int viewType) {
  RecyclerView.ViewHolder vh;
  if (viewType == VIEW_ITEM) {
   View v = LayoutInflater.from(parent.getContext()).inflate(
     R.layout.list_row, parent, false);

   vh = new StudentViewHolder(v);
  } else {
   View v = LayoutInflater.from(parent.getContext()).inflate(
     R.layout.progress_item, parent, false);

   vh = new ProgressViewHolder(v);
  }
  return vh;
 }

 @Override
 public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
  if (holder instanceof StudentViewHolder) {
   
   Student singleStudent= (Student) studentList.get(position);
   
   ((StudentViewHolder) holder).tvName.setText(singleStudent.getName());
   
   ((StudentViewHolder) holder).tvEmailId.setText(singleStudent.getEmailId());
   
   ((StudentViewHolder) holder).student= singleStudent;
   
  } else {
   ((ProgressViewHolder) holder).progressBar.setIndeterminate(true);
  }
 }

 public void setLoaded() {
  loading = false;
 }

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

 public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
  this.onLoadMoreListener = onLoadMoreListener;
 }


 //
 public static class StudentViewHolder extends RecyclerView.ViewHolder {
  public TextView tvName;
  
  public TextView tvEmailId;
  
  public Student student;

  public StudentViewHolder(View v) {
   super(v);
   tvName = (TextView) v.findViewById(R.id.tvName);
   
   tvEmailId = (TextView) v.findViewById(R.id.tvEmailId);
   
   v.setOnClickListener(new OnClickListener() {
    
    @Override
    public void onClick(View v) {
     Toast.makeText(v.getContext(),
       "OnClick :" + student.getName() + " \n "+student.getEmailId(),
       Toast.LENGTH_SHORT).show();
     
    }
   });
  }
 }

 public static class ProgressViewHolder extends RecyclerView.ViewHolder {
  public ProgressBar progressBar;

  public ProgressViewHolder(View v) {
   super(v);
   progressBar = (ProgressBar) v.findViewById(R.id.progressBar1);
  }
 }
}



Source Code Link

 Sample Apk Link 


ScreenShots
=========

 


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







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Labels: , ,

Tuesday, 13 January 2015

Endless RecyclerView OnScrollListener Example in android


Note:

I have updated this post.Please see the updated post



If you have thousands of records in your database server, rather than getting all records loading at a time, try to load some x number of records in the onscroll event and update the ui,

Example:
If you have 1000 records in the server db, get 50 records first time, if the user reached to the last record in the ui, then again load 50 more records in the onscrolllistener event.

Step: 1
======
In this example, i am using following github code snippet for endless RecyclerView

Credit goes to: WoongBi Kim
https://gist.github.com/ssinss/e06f12ef66c51252563e

Step: 2
======

Now, Create an Activity with RecyclerView 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;

public class CardViewActivity extends AppCompatActivity {

 private Toolbar toolbar;

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

 private List<Student> studentList;

 // on scroll

 private static int current_page = 1;

 private int ival = 1;
 private int loadLimit = 10;

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

  studentList = new ArrayList<Student>();

  loadData(current_page);

  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);

  mLayoutManager = new LinearLayoutManager(this);

  // use a linear layout manager
  mRecyclerView.setLayoutManager(mLayoutManager);

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

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

  mRecyclerView.setOnScrollListener(new EndlessRecyclerOnScrollListener(
    mLayoutManager) {
   @Override
   public void onLoadMore(int current_page) {
    // do somthing...

    loadMoreData(current_page);

   }

  });

 }
// By default, we add 10 objects for first time.
 private void loadData(int current_page) {

  // I have not used current page for showing demo, if u use a webservice
  // then it is useful for every call request

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

   studentList.add(st);
   ival++;

  }

 }
 // adding 10 object creating dymically to arraylist and updating recyclerview when ever we reached last item
 private void loadMoreData(int current_page) {

  // I have not used current page for showing demo, if u use a webservice
  // then it is useful for every call request

  loadLimit = ival + 10;

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

   studentList.add(st);
   ival++;
  }

  mAdapter.notifyDataSetChanged();
  
 }

}

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" />

</LinearLayout>



Step: 3
======
EndlessRecyclerOnScrollListener.java


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package com.pratap.cardviews1;

import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

public abstract class EndlessRecyclerOnScrollListener extends
  RecyclerView.OnScrollListener {
 public static String TAG = EndlessRecyclerOnScrollListener.class
   .getSimpleName();

 private int previousTotal = 0;
 private boolean loading = true;
 private int visibleThreshold = 5;
 int firstVisibleItem, visibleItemCount, totalItemCount;

 private int current_page = 1;

 private LinearLayoutManager mLinearLayoutManager;

 public EndlessRecyclerOnScrollListener(
   LinearLayoutManager linearLayoutManager) {
  this.mLinearLayoutManager = linearLayoutManager;
 }

 @Override
 public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
  super.onScrolled(recyclerView, dx, dy);

  visibleItemCount = recyclerView.getChildCount();
  totalItemCount = mLinearLayoutManager.getItemCount();
  firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();

  if (loading) {
   if (totalItemCount > previousTotal) {
    loading = false;
    previousTotal = totalItemCount;
   }
  }
  if (!loading
    && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
   // End has been reached

   // Do something
   current_page++;

   onLoadMore(current_page);

   loading = true;
  }
 }

 public abstract void onLoadMore(int current_page);
}

Step: 4
======
Now create an adapter for the RecyclerView

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.View.OnClickListener;
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) {

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

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

 }

 // 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 Student singlestudent;

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

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

   tvEmailId = (TextView) itemLayoutView.findViewById(R.id.tvEmailId);
   // Onclick event for the row to show the data in toast
   itemLayoutView.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {

     Toast.makeText(
       v.getContext(),
       "Data : \n" + singlestudent.getName() + " \n"
         + singlestudent.getEmailId(),
       Toast.LENGTH_SHORT).show();

    }
   });

  }

 }

}

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" />
    </RelativeLayout>

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


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;
 }

}

ScreenShots:
=========


  


Source Code 
=========

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