I have an Endless RecyclerView with library PullLoadView
this RecyclerView is fill the layout, I want to when this RecyclerView load all its items and reach the end of end, I load another RecyclerView at bottom of it, which has its own adapter and row layout and continue .
something like this application I need :
first RecyclerView:
first RecyclerView reaches end and new RecyclerView show up
new RecyclerView continue the first RecyclerView in full layour screen
xml Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_search"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/rvOne"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/rvTwo"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
Replace your xml source with the below source
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:scrollbars="none">
<LinearLayout
android:id="#+id/activity_search"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/rvOne"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.v7.widget.RecyclerView
android:id="#+id/rvTwo"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
Put them in a NestedScrollView with a vertically oriented LinearLayout and Disable their scrolling by setting their linearlayout manager like this.
LinearLayoutManager mLayoutManager = new LinearLayoutManager(this) {
#Override
public boolean canScrollVertically() {
return false;
}
};
Use ListView as your bottom View and in your ListView header put RecycerView
list_sample.xml (This is your main layout for activity set content)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="#+id/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<ListView
android:id="#+id/list_sample"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
header_recycler.xml(List view header layout)
<?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">
<android.support.v7.widget.RecyclerView
android:id="#+id/list_header"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
item_header.xml(items for header's list i.e. recyclerview one)
<?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">
<TextView
android:id="#+id/item_header_regular"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#FF2255" />
</LinearLayout>
list_item.xml (List view's item)
<?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">
<TextView
android:id="#+id/text"
android:layout_width="match_parent"
android:layout_height="50dp" />
</LinearLayout>
HeaderRecyclerView.java (RecyclerView adapter)
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class HeaderRecyclerView extends RecyclerView.Adapter<HeaderRecyclerView.HeaderHolder> {
private final Context context;
private List<String> items;
public HeaderRecyclerView(List<String> items, Context context) {
this.items = items;
this.context = context;
}
#Override
public HeaderHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_header, parent, false);
return new HeaderHolder(v);
}
#Override
public void onBindViewHolder(HeaderHolder holder, int position) {
String item = items.get(position);
holder.textView.setText(item);
}
#Override
public int getItemCount() {
if (items == null) {
return 0;
}
return items.size();
}
class HeaderHolder extends RecyclerView.ViewHolder {
TextView textView;
HeaderHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.item_header_regular);
}
}
}
BottomListAdapter.java (ListView adapter)
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class BottomListAdapter extends BaseAdapter {
private List<String> items = new ArrayList<>();
private Context context;
public BottomListAdapter(List<String> items, Context context) {
this.items = items;
this.context = context;
}
#Override
public int getCount() {
return items.size();
}
#Override
public String getItem(int i) {
return items.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int i, View convertView, ViewGroup viewGroup) {
TextView txtView;
if (convertView == null) {
convertView = LayoutInflater.from(context)
.inflate(R.layout.list_item, viewGroup, false);
txtView = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(new ViewHolder(txtView));
} else {
ViewHolder viewHolder = (ViewHolder) convertView.getTag();
txtView = viewHolder.txtView;
}
String string = getItem(i);
txtView.setText(string);
return convertView;
}
private static class ViewHolder {
public final TextView txtView;
public ViewHolder(TextView txtView) {
this.txtView = txtView;
}
}
}
In Your onCreate use the below to initialize as follwing
ListView listView = (ListView) findViewById(R.id.list_sample);
View view = getLayoutInflater().inflate(R.layout.header_recycler, null);
RecyclerView headerList = (RecyclerView) view.findViewById(R.id.list_header);
List<String> strings = new ArrayList<>();
for (int i = 0; i < 50; i++) {
strings.add(i + "");
}
headerList.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
headerList.setAdapter(new HeaderRecyclerView(strings, this));
listView.addHeaderView(view);
listView.setAdapter(new BottomListAdapter(strings, this));
Related
6 grid should be shown without scrolling, that is it should be like setting layout_weight="1" & layout_height="1" for every grid cards.
6 cards should be shown respective of screen size.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">
<GridView
android:id="#+id/gvImages"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="3"
app:layout_constrainedHeight="true"
app:layout_constrainedWidth="true"
app:layout_constraintVertical_weight="1"
app:layout_constraintHorizontal_weight="1"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
grid_layout.xml
<?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"
xmlns:tools="http://schemas.android.com/tools">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="center"
tools:srcCompat="#tools:sample/avatars" />
</LinearLayout>
MyAdapter.java
package com.aijishnu.baseadaptersample;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import com.aijishnu.baseadaptersample.databinding.GridLayoutBinding;
public class MyAdapter extends BaseAdapter {
Context c;
int items[];
MyAdapter(Context c, int arr[]) {
this.c = c;
items = arr;
}
#Override
public int getCount() {
return items.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
GridLayoutBinding itemBinding = GridLayoutBinding.inflate(LayoutInflater.from(parent.getContext()), parent,false);
holder = new ViewHolder(itemBinding);
holder.view = itemBinding.getRoot();
holder.view.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.binding.imageView.setImageResource(items[position]);
return holder.view;
}
private static class ViewHolder {
private View view;
private GridLayoutBinding binding;
ViewHolder(GridLayoutBinding binding) {
this.view = binding.getRoot();
this.binding = binding;
}
}
}
MainActivity.java
package com.aijishnu.baseadaptersample;
import android.os.Bundle;
import com.aijishnu.baseadaptersample.databinding.ActivityMainBinding;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
ActivityMainBinding binding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
int[] itemsarray = new int[] {
R.drawable.ic_launcher_background, R.drawable.ic_launcher_foreground,
R.drawable.ic_launcher_background, R.drawable.ic_launcher_foreground,
R.drawable.ic_launcher_background, R.drawable.ic_launcher_foreground,
};
MyAdapter adapter = new MyAdapter(this, itemsarray);
binding.gvImages.setAdapter(adapter);
}
}
Above code results as like this, (This is not fit to screen height, also have scrolling option, I want 6 cards should fit to screen size)
I want to have like this(all cards equals according to screen size)
NB: These cards should be randomly generated using BaseAdapter or RecyclerAdapter
You can set the number of rows and columns of your GridLayout inside your xml file
I have recyclerview and it shows just single records instead of two records. I have searched many post on google and found to modify height of listview items from "match_parent " To "Wrap_Content" hence I did the same but still it shows single records.
Activity Mumbai_Male
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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=".MumbaiMale">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageView
android:layout_width="90dp"
android:layout_height="90dp"
android:id="#+id/myImg"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/name"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/age"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/education"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:scrollbars="vertical"
android:id="#+id/recyclerView" />
</LinearLayout>
CustomeAdapter is:
package com.maheshwaghela.mahesh.rukhivivah;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomAdapter extends
RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private MumbaiMale.IconData[] data;
public CustomAdapter (MumbaiMale.IconData[] data) {
this.data = data;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View listItem= layoutInflater.inflate(R.layout.activity_mumbai_male, parent, false);
ViewHolder viewHolder = new ViewHolder(listItem);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.name.setText(data[position].getPname());
holder.age.setText(data[position].getPage());
holder.education.setText(data[position].getPedu());
holder.imageView.setImageResource(data[position].getImgId());
}
#Override
public int getItemCount() {
return data.length;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public TextView name;
public TextView age; public TextView education;
public ViewHolder(View itemView) {
super(itemView);
this.imageView = (ImageView) itemView.findViewById(R.id.myImg);
this.name = (TextView) itemView.findViewById(R.id.name);
this.age=(TextView) itemView.findViewById(R.id.age);
this.education=(TextView) itemView.findViewById(R.id.education);
}
}
}
Mumbai_Male.Java
package com.maheshwaghela.mahesh.rukhivivah;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
public class MumbaiMale extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mumbai_male);
IconData[] data = new IconData[] {
new IconData("Name:- Mahesh K. Waghela","Age:-45","Education:-B.com", R.drawable.dilip333),
new IconData ("Name:- Sunil K. Waghela","Age:-33","Education:-S.S.C.",R.drawable.hiteshhh)
};
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
CustomAdapter adapter=new CustomAdapter(data);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
public class IconData {
private String pname;
private String page;
private String pedu;
private int imgId;
public IconData(String name, String age, String edu, int imgId) {
this.pname = name;
this.page= age;
this.pedu= edu;
this.imgId = imgId;
}
public String getPname()
{
return pname;
}
public void setPname(String name)
{
this.pname = name;
}
public String getPage()
{
return page;
}
public void setPage(String age)
{
this.page=age;
}
public String getPedu()
{
return pedu;
}
public void setMyPedu(String edu)
{
this.pedu=edu;
}
public int getImgId()
{
return imgId;
}
public void setImgId(int imgId)
{
this.imgId = imgId;
}
}
}
Where I am wrong don't know but it shows single records instead of two records.
As per your current code, your RecyclerView will display both record for both wrap_content and match_parent. You can see second record if you will scroll your list.
Also You are getting this type of wired output because your are using the same layout as a Activity Layout and Adapter's item layout. So adapter will bind image, name etc.. but it will also display a blank RecyclerView for each row.
So the solution is just keep your RecyclerView inside activity_mumbai_male.xml and create new xml file for your RecyclerView item and inflate that layout xml file inside your adapter. Your issue will be fixed.
Please check below corrected code.
activity_mumbai_male.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MumbaiMale">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:scrollbars="vertical" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
item_list.xml
<?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="horizontal">
<ImageView
android:id="#+id/myImg"
android:layout_width="90dp"
android:layout_height="90dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"
android:orientation="vertical">
<TextView
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/age"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/education"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
Replace your code with my below code in CustomAdapter.xml
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View listItem = layoutInflater.inflate(R.layout.item_list, parent, false);
ViewHolder viewHolder = new ViewHolder(listItem);
return viewHolder;
}
You are using RecyclerView, but I could not found your xml regarding Row, you have set text to the Simple Single TextView Which you have provide in your activity_mumbai.xml, To you recyclerview you need to create another xml, which is counted as a row, means single item of your RecyclerView, and Print your xml data in that view.
row_item_view.xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="90dp"
android:layout_height="90dp"
android:id="#+id/myImg"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/name"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/age"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/education"/>
</LinearLayout>
</LinearLayout>
and Change SetContentView in your custom adapter with this new xml.
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View listItem= layoutInflater.inflate(R.layout.row_item_view, parent, false);
ViewHolder viewHolder = new ViewHolder(listItem);
return viewHolder;
}
This will fix your problem.
I am facing an issue the problem is I can see the Fragment but not the
GridView which I have there created, in the LogCat no error nothing but somehow the code it is not working.
But if I remove GridView from bookmark.xml and only leave a TextView than I can show the TextView
I am trying to reach a GridView into a Fragment.
This is my code.
Fragment
public class FragmentBookmark extends Fragment {
View paramView;
public FragmentBookmark() {
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
paramView = inflater.inflate(R.layout.bookmark, container, false);
return paramView;
}
}
This is the Main Activity
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.AddFragment(new FragmentExplore(), "");
adapter.AddFragment(new FragmentBookmark(), "");
adapter.AddFragment(new FragmentStore(), "");
mViewPager.setAdapter(adapter);
mTabLayout.setupWithViewPager(mViewPager);
This is the xml for Bookmark Fragment
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>
</LinearLayout>
Try like this using framelayout
<FrameLayout
xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<GridView
android:id = "#+id/gvList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:verticalSpacing="0dp"
android:horizontalSpacing="0dp"
android:stretchMode="spacingWidth"
android:numColumns="2"/>
</FrameLayout>
You need to set adapter to your GridView as only GridView will never show anything as it is a simple ViewGroup.. Also rather than using GridView try to use RecyclerView in grid mode. Below is a simple tutorial you can follow-
RecyclerView as GridView with GridLayoutManager
xml:
<?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">
<android.support.v7.widget.RecyclerView
android:id="#+id/m_recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp" />
</LinearLayout>
grid_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 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="wrap_content"
app:cardElevation="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="#+id/imageview1"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="5dp"
android:contentDescription="#null" />
<TextView
android:id="#+id/tv_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:maxLines="1"
android:singleLine="true"
tools:text="Category" />
</LinearLayout>
</android.support.v7.widget.CardView>
Adapter:
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private Context mContext;
private List<String> myNameList;
public MyAdapter(Context context, List<String> categoryInfo) {
mContext = context;
myNameList = categoryInfo;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_item, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, final int position) {
String myName = myNameList.get(position);
holder.tvName.setText(myName);
}
#Override
public int getItemCount() {
return myNameList.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
private TextView tvName;
MyViewHolder(View itemView) {
super(itemView);
tvName = itemView.findViewById(R.id.tv_name);
}
}
}
In your Activity or Fragment:
Context mContext = this;
RecyclerView mRecyclerView;
mRecyclerView = findViewById(R.id.m_recyclerView);
mRecyclerView.setLayoutManager(new android.support.v7.widget.GridLayoutManager(mContext, 3));
ArrayList<String> nameArray = new ArrayList<>();
nameArray.add("name 1");
nameArray.add("name 2");
nameArray.add("name 3");
nameArray.add("name 4");
mRecyclerView.setAdapter(new MyAdapter(mContext, nameArray));
Check out my code:
import android.content.Context;
import android.content.Intent;
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.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.ls.LSException;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Created by Ankit on 3/25/2016.
*/
public class CustomAdapterRecyclerView extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
Context context;
private ArrayList<String> questionsList;
LayoutInflater layoutInflater;
public CustomAdapterRecyclerView(Context context, ArrayList<String> questionsList) {
this.context = context;
this.questionsList = questionsList;
layoutInflater = LayoutInflater.from(context);
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 1:
final View view = layoutInflater.inflate(R.layout.recycler_view_list, parent, false);
MyViewHolder myViewHolder = new MyViewHolder(view, context);
return myViewHolder;
default:
final View view1 = layoutInflater.inflate(R.layout.single_item_in_list, parent, false);
MyExpandedViewHolder myExpandedViewHolder= new MyExpandedViewHolder(view1, context,new ArrayList<String>(Arrays.asList("A","Aa")));
return myExpandedViewHolder;
}
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
switch (holder.getItemViewType())
{
case 1:
MyViewHolder vh = (MyViewHolder) holder;
vh.questionTitle.setText(questionsList.get(position));
break;
default:
MyExpandedViewHolder viewHolder= (MyExpandedViewHolder) holder;
viewHolder.getListView();
}
}
/*
#Override
public void onBindViewHolder(RecyclerView.V holder, int position) {
holder.questionTitle.setText(questionsList.get(position));
}*/
#Override
public int getItemCount() {
return questionsList.size();
}
#Override
public int getItemViewType(int position) {
if(position ==0|| position==1|| position==2)
{
return 0;
}
else
return 1;
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView questionTitle;
private Context context;
public MyViewHolder(final View itemView, Context context) {
super(itemView);
this.context = context;
itemView.setOnClickListener(this);
questionTitle = (TextView) itemView.findViewById(R.id.question);
questionTitle.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Toast.makeText(context, "" + getAdapterPosition() + questionTitle.getText().toString(), Toast.LENGTH_LONG).show();
Log.d("TAG", "" + getAdapterPosition());
Intent intent = new Intent(context, ProgramViewer.class);
intent.putExtra("titlePos",getAdapterPosition());
intent.putExtra("title",questionTitle.getText().toString());
context.startActivity(intent);
}
}
public class MyExpandedViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
private Context context;
ListView listView;
public MyExpandedViewHolder(View itemView, Context context,ArrayList<String> mobileArray) {
super(itemView);
this.context = context;
ArrayAdapter adapter = new ArrayAdapter<String>(context, R.layout.expanded_list_inside_recycler_view, mobileArray);
listView= (ListView) itemView.findViewById(R.id.list_view);
listView.setAdapter(adapter);
}
public ListView getListView()
{
return this.listView;
}
#Override
public void onClick(View v) {
Toast.makeText(context,getAdapterPosition()+"",Toast.LENGTH_LONG).show();
}
}
}
What I tried to do is to expand the RecyclerView item on click but first I have to implement recycler view and list view together. I am getting NullPointerException. Please tell me the problem in my code. The answer would be greatly appreciated.
Log file:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at kole.technicalbird.CustomAdapterRecyclerView$MyExpandedViewHolder.<init>(CustomAdapterRecyclerView.java:113)
at kole.technicalbird.CustomAdapterRecyclerView.onCreateViewHolder(CustomAdapterRecyclerView.java:43)
at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5476)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4701)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(
Layout File: single_item_in_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/textView"
android:text="a"/>
</LinearLayout>
**recycler_view_list**
<?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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:elevation="8dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/question"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:fontFamily="sans-serif"
android:text="ques"
android:padding="8dp"
android:layout_marginRight="32dp"
android:textSize="16dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginRight="8dp"
android:fontFamily="sans-serif"
android:layout_centerVertical="true"
android:padding="8dp"
android:text=">" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
<ImageView
android:src="#android:drawable/divider_horizontal_dark"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingBottom="0.2dp"
android:paddingTop="0.2dp" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/list_view">
</ListView>
</LinearLayout>
expanded_list_inside_recycler_view
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/list_view">
</ListView>
</LinearLayout>
Where is your listview in your single_item_in_list.xml.
Your single_item_in_list.xml don't have listview,so when you use getListView() ,the listview is null.I guess this is the reason!
Here is the problem: I create the simplest RecyclerView in the world, but it displays only the first item. I cannot understand why. Thanks for any help.
item_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/tv_detail"/>
</RelativeLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.bcit.moonlady.testrecycler.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="#+id/tv_hello"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="300dp"
android:id="#+id/rv_details"
android:layout_below="#+id/tv_hello"/>
</RelativeLayout>
MainActivity.java
package com.bcit.moonlady.testrecycler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
String[] data = {"test1", "test2", "test3"};
RecyclerView mRecView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecView = (RecyclerView)findViewById(R.id.rv_details);
mRecView.setHasFixedSize(true);
mRecView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
mRecView.setAdapter(new DetailAdapter());
}
private class DetailView extends RecyclerView.ViewHolder {
TextView mTextView;
public DetailView(View itemView) {
super(itemView);
mTextView = (TextView)itemView.findViewById(R.id.tv_detail);
}
public void bindView(String string) {
mTextView.setText(string);
}
}
private class DetailAdapter extends RecyclerView.Adapter<DetailView> {
#Override
public DetailView onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View v = layoutInflater.inflate(R.layout.item_layout, parent, false);
return new DetailView(v);
}
#Override
public void onBindViewHolder(DetailView holder, int position) {
String string = data[position];
holder.bindView(string);
}
#Override
public int getItemCount() {
return data.length;
}
}
}
You need to change your item_layout height as wrap_content
if your are using Android Support Library v 23.2.0 and above
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/tv_detail"/>
</RelativeLayout>
I too made this common mistake. Just change your parent LinearLayout - height should be "wrap_content"
<LinearLayout
android:layout_width="match_parent"
android:layout_height = "wrap_content"
..... >
..
..
</LinearLayout>
I had same problem, when RecyclerView was wrapped in ScrollView. You should use NestedScrollView instead.
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!-- other content -->
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
Set the height to wrap_content of the RelativeLayout in the item_layout.xml.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/tv_detail"/>
</RelativeLayout>
it may help
customAdapter = new CustomRecycleradapter(arrItems);
recyclerView.setLayoutManager(new LinearLayoutManager(mParentActivity));
recyclerView.setAdapter(customAdapter);
ArrayList<ListofItems> mSource;
// adapter class
public CustomRecycleradapter(ArrayList<ListofItems> source) {
this.mSource = source;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item, parent, false);
return new CustomHolder(view);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof CustomHolder) {
((CustomHolder) holder).customerName.setText(mSource.get(position).getCustomerNumber());
}
}
#Override
public int getItemCount() {
return mSource.size();
}
public void addItem(ArrayList<ListofItems> itemLists) {
mSource.addAll(itemLists);
notifyItemInserted(mSource.size() - 1);
}
public class CustomHolder extends RecyclerView.ViewHolder {
#Bind(R.id.customer_name)
TextView customerName;
#Bind(R.id.time_stamp)
TextView timeStamp;
#Bind(R.id.amount)
TextView amount;
public CustomHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
Activity:
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
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.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecycler;
String[] data = {"test1", "test2", "test3"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mRecycler = (RecyclerView) findViewById(R.id.rv_details);
DetailAdapter adapter = new DetailAdapter();
LinearLayoutManager manager = new LinearLayoutManager(this);
mRecycler.setHasFixedSize(true);
mRecycler.setLayoutManager(manager);
mRecycler.setAdapter(adapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class DetailAdapter extends RecyclerView.Adapter<DetailAdapter.DetailView> {
#Override
public void onBindViewHolder(DetailView holder, int position) {
String string = data[position];
holder.bindView(string);
}
#Override
public DetailView onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View v = layoutInflater.inflate(R.layout.item_layout, parent, false);
return new DetailView(v);
}
#Override
public int getItemCount() {
return data.length;
}
class DetailView extends RecyclerView.ViewHolder {
TextView mTextView;
public DetailView(View itemView) {
super(itemView);
mTextView = (TextView)itemView.findViewById(R.id.tv_detail);
}
public void bindView(String string) {
mTextView.setText(string);
}
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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" android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
android:layout_width="match_parent" android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar android:id="#+id/toolbar"
android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary" app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
<android.support.design.widget.FloatingActionButton android:id="#+id/fab"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="bottom|end" android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_main" tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rv_details"
/>
</RelativeLayout>
item_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/tv_detail"/>
</RelativeLayout>
First up, u should put your Recyclerview.veiwholder class inside the adapter to ensure youre getting the same instance.
//replaces contents of a view, invoked by the layout manager
#Override public void onBindViewHolder(ViewHolder holder, int position) {
// get the message to display from the array at the specified position
// replace contents of the view with the new element
holder.mytextview.setText(recieveHistory.get(position));
}