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/e06f12ef66c51252563eStep: 2======
Now, Create an Activity with RecyclerView in the XML Layout file.
CardViewActivity.java 1
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110 | 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();
}
}
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19 | <?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>
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======
EndlessRecyclerOnScrollListener.java1
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53 | 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);
}
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======
Now create an adapter for the RecyclerView
CardViewDataAdapter.java1
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90 | 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();
}
});
}
}
}
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34 | <?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>
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60 | 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;
}
}
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=========
Source Code =========
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