Develop Reference

Fragment not displaying the whole recyclerview. Its displaying only one cardview

The fragment only displays one cardview when I am trying to retrieve it from the news API.
Here is the code.
Main Activity
package com.manish.newapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create an instance of the tab layout from the view.
TabLayout tabLayout = findViewById(R.id.tab_layout);
// Set the text for each tab.
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label1));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label2));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label3));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label4));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label5));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label6));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label7));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label8));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label9));
tabLayout.addTab(tabLayout.newTab().setText(R.string.tab_label10));
// Set the tabs to scroll through the entire layout.
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
// Use PagerAdapter to manage page views in fragments.
// Each page is represented by its own fragment.
final ViewPager viewPager = findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
// Setting a listener for clicks.
viewPager.addOnPageChangeListener(new
TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new
TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
}
TabNews Fragment
package com.manish.newapp.Fragments;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.manish.newapp.Adapter;
import com.manish.newapp.ApiClient;
import com.manish.newapp.Models.Articles;
import com.manish.newapp.Models.Headlines;
import com.manish.newapp.Models.Source;
import com.manish.newapp.R;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class TabNews1 extends Fragment {
View v;
RecyclerView recyclerView;
final String API_KEY = "5a1ad719eee94e7ba60d19b51f4ff159";
String sources = "bbc-news";
Adapter adapter;
List<Articles> articles = new ArrayList<>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// String country = getCountry();
// retrieveJson(country,API_KEY);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
v= inflater.inflate(R.layout.fragment_tab_news1, container, false);
recyclerView = (RecyclerView)v.findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
String country = getCountry();
retrieveJson(country,API_KEY);
// retrieveJson(sources,API_KEY);
// Inflate the layout for this fragment
return v;
}
public void retrieveJson(String country, String apiKey){
Call<Headlines> call = ApiClient.getInstance().getApi().getHeadlines(country,apiKey);
call.enqueue(new Callback<Headlines>() {
#Override
public void onResponse(Call<Headlines> call, Response<Headlines> response) {
if (response.isSuccessful() && response.body().getArticles() != null){
articles.clear();
articles = response.body().getArticles();
adapter = new Adapter(getContext(),articles);
recyclerView.setAdapter(adapter);
}
}
#Override
public void onFailure(Call<Headlines> call, Throwable t) {
Toast.makeText(getContext(), t.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
}
});
}
public String getCountry(){
Locale locale = Locale.getDefault();
String country = locale.getCountry();
return country.toLowerCase();
}
}
adapter Class
package com.manish.newapp;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;
import com.manish.newapp.Models.Articles;
import com.squareup.picasso.Picasso;
import java.util.List;
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
Context context;
List<Articles> articles;
public Adapter(Context context, List<Articles> articles) {
this.context = context;
this.articles = articles;
}
#NonNull
#Override
public Adapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.items_recycler,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull Adapter.ViewHolder holder, int position) {
Articles art = articles.get(position);
holder.txtTitle.setText(art.getTitle());
holder.txtDescription.setText(art.getDescription());
holder.txtDate.setText(art.getPublishedAt());
String imageUrl = art.getUrlToImage();
Picasso.with(context).load(imageUrl).into(holder.imageView);
}
#Override
public int getItemCount() {
return articles.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView txtTitle, txtDescription, txtDate, txtTime;
ImageView imageView;
CardView cardView;
public ViewHolder(#NonNull View itemView) {
super(itemView);
txtTitle = (TextView)itemView.findViewById(R.id.title_text);
txtDescription = (TextView)itemView.findViewById(R.id.desc);
txtTime = (TextView)itemView.findViewById(R.id.time);
txtDate = (TextView)itemView.findViewById(R.id.date);
imageView = (ImageView)itemView.findViewById(R.id.image_news);
cardView = (CardView)itemView.findViewById(R.id.cardView);
}
}
}
Pager Adapter class
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentStatePagerAdapter;
import com.manish.newapp.Fragments.TabNews1;
import com.manish.newapp.Fragments.TabNews10;
import com.manish.newapp.Fragments.TabNews2;
import com.manish.newapp.Fragments.TabNews3;
import com.manish.newapp.Fragments.TabNews4;
import com.manish.newapp.Fragments.TabNews5;
import com.manish.newapp.Fragments.TabNews6;
import com.manish.newapp.Fragments.TabNews7;
import com.manish.newapp.Fragments.TabNews8;
import com.manish.newapp.Fragments.TabNews9;
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
public PagerAdapter(#NonNull FragmentManager fm,int NumOfTabs) {
super(fm, NumOfTabs);
this.mNumOfTabs = NumOfTabs;
}
#NonNull
/**
* Return the Fragment associated with a specified position.
*
* #param position
*/
#Override
public Fragment getItem(int position) {
switch (position){
case 0 : return new TabNews1();
case 1 : return new TabNews2();
case 2 : return new TabNews3();
case 3 : return new TabNews4();
case 4 : return new TabNews5();
case 5 : return new TabNews6();
case 6 : return new TabNews7();
case 7 : return new TabNews8();
case 8 : return new TabNews9();
case 9 : return new TabNews10();
default: return null;
}
}
/**
* Return the number of views available.
*/
#Override
public int getCount() {
return mNumOfTabs;
}
}
Here are my layout files.
item_recycler.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView"
android:layout_margin="16dp"
android:padding="10dp"
app:cardElevation="4dp"
app:cardCornerRadius="10dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp">
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="#+id/image_news"
android:src="#drawable/image"
android:scaleType="centerCrop"/>
<!-- <FrameLayout-->
<!-- android:layout_width="match_parent"-->
<!-- android:layout_height="wrap_content"-->
<!-- android:id="#+id/frame_layout"-->
<!-- android:layout_below="#+id/image_news"-->
<!-- android:padding="5dp">-->
<!-- <RelativeLayout-->
<!-- android:layout_width="match_parent"-->
<!-- android:layout_height="wrap_content">-->
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TITLE"
android:textSize="20dp"
android:layout_below="#+id/image_news"
android:textStyle="bold"
android:id="#+id/title_text"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/desc"
android:text="DESCRIPTION"
android:layout_marginTop="10dp"
android:textSize="14dp"
android:layout_below="#+id/title_text"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/time"
android:layout_below="#+id/desc"
android:text="TIME"
android:layout_marginTop="5dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/date"
android:layout_below="#+id/time"
android:text="DATE"
android:layout_marginTop="5dp"/>
<!-- </RelativeLayout>-->
<!-- </FrameLayout>-->
</RelativeLayout>
</androidx.cardview.widget.CardView>
</RelativeLayout>
fragment_tab_news1.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"
tools:context=".Fragments.TabNews1"
android:background="#color/colorBackground">
<!-- TODO: Update blank fragment layout -->
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!-- <TextView-->
<!-- android:layout_width="match_parent"-->
<!-- android:layout_height="wrap_content"-->
<!-- android:text="BBC NEWS"-->
<!-- android:textStyle="bold"-->
<!-- android:textSize="17sp"-->
<!-- android:layout_marginLeft="16dp"-->
<!-- android:layout_marginRight="16dp"-->
<!-- android:layout_marginTop="10dp"-->
<!-- android:fontFamily="sans-serif-light"/>-->
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
</RelativeLayout>
Mainactivity.xml
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:id="#+id/relative_main"
android:padding="16dp"
>
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/toolbar"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<androidx.viewpager.widget.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="#id/tab_layout"/>
</RelativeLayout>
Please help me with this, I am unable to find whats wrong here.

Dynamic Fragment with CardView in a RecycleViewAdapter

I am totally new in the world of Android development and have some trouble to understand how a RecycleViewAdapter works with a CardView when the CardView is a Fragment. I was trying to understand the example on https://github.com/firebase/quickstart-android/blob/master/database/README.md but since they are using a lot of stuff which is related to Firebase I tried to port this to my own example.
I want to have a list which contains several cards just like this:
However, the user should be able to add and remove different cards. At the beginning the view should be empty and if the user press the floating button on the right corner
a new card should be created.
I've just ported the way I thought it should work. Unfortunately, when I press the button nothing is happening (of course the Hello World is printed).
Thanks for you help.
Here is the code of my MainActivity:
package com.example.dynamicfragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class MainActivity extends AppCompatActivity
{
private FragmentManager fragmentManager;
private FragmentTransaction fragmentTransaction;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
System.out.println("Hello World");
fragmentTransaction.add(new CardListFragment(), "CardListFragment");
}
});
fragmentTransaction.commit();
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
int id = item.getItemId();
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
}
This is the class who extend the CardListFragment:
package com.example.dynamicfragment;
import android.os.Bundle;
import android.app.Fragment;
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 com.example.dynamicfragment.adapter.CardAdapter;
import com.example.dynamicfragment.model.Party;
import java.util.ArrayList;
public class CardListFragment extends Fragment
{
private static final String TAG = "CardListFragment";
private RecyclerView mRecycler;
private LinearLayoutManager mManager;
private CardAdapter mAdapter;
#Override
public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
super.onCreateView(inflater, container, savedInstanceState);
View rootView = inflater.inflate(R.layout.fragment_card_list, container, false);
mRecycler = rootView.findViewById(R.id.messagesList);
mRecycler.setHasFixedSize(true);
ArrayList<Party> demo = new ArrayList<>();
demo.add(new Party(0,"Demo", R.drawable.ic_action_account_circle_40));
this.mAdapter = new CardAdapter(demo);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
mManager = new LinearLayoutManager(getActivity());
mManager.setReverseLayout(true);
mManager.setStackFromEnd(true);
mRecycler.setLayoutManager(mManager);
mRecycler.setAdapter(null);
}
#Override
public void onStart()
{
super.onStart();
if (null != mAdapter)
{
//mAdapter.startListening();
}
}
#Override
public void onStop()
{
super.onStop();
if (null != mAdapter)
{
//mAdapter.stopListening();
}
}
}
Here is the code of my data model:
package com.example.dynamicfragment.model;
import java.util.Objects;
public class Party
{
private int id;
private String name;
private int image;
public Party(int id, String name, int image)
{
this.id = id;
this.name = name;
this.image = image;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getImage() {
return image;
}
public void setImage(int image) {
this.image = image;
}
#Override
public boolean equals(Object o)
{
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Party party = (Party) o;
return id == party.id;
}
#Override
public int hashCode() {
return Objects.hash(id);
}
}
Here is my Adapater class:
package com.example.dynamicfragment.adapter;
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;
import com.example.dynamicfragment.R;
import com.example.dynamicfragment.model.Party;
import java.util.ArrayList;
public class CardAdapter extends RecyclerView .Adapter<CardAdapter.CardViewHolder>
{
private ArrayList<Party> dataList;
public static class CardViewHolder extends RecyclerView.ViewHolder
{
TextView partyName;
ImageView imageViewIcon;
public CardViewHolder(View itemView)
{
super(itemView);
this.partyName = (TextView) itemView.findViewById(R.id.postAuthor);
this.imageViewIcon = (ImageView) itemView.findViewById(R.id.postAuthorPhoto);
}
}
public CardAdapter(ArrayList<Party> data)
{
this.dataList = data;
}
#Override
public CardViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view, parent, false);
return new CardViewHolder(view);
}
#Override
public void onBindViewHolder(final CardViewHolder holder, final int listPosition)
{
TextView partyName = holder.partyName;
ImageView imageView = holder.imageViewIcon;
partyName.setText(dataList.get(listPosition).getName());
imageView.setImageResource(dataList.get(listPosition).getImage());
}
#Override
public int getItemCount()
{
return dataList != null ? dataList.size() : 0;
}
}
Content files:
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"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
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"
app:srcCompat="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
content_main.xml:
<?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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="#layout/activity_main">
<include layout="#layout/fragment_card_list" />
</android.support.constraint.ConstraintLayout>
fragment_card_list.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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.support.v7.widget.RecyclerView
android:id="#+id/messagesList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:clipToPadding="false"
android:padding="5dp"
android:scrollbars="vertical"
tools:listitem="#layout/card_view" />
</FrameLayout>
card_view.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 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:layout_margin="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp">
<include
android:id="#+id/postAuthorLayout"
layout="#layout/include_post_author"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true" />
<LinearLayout
android:id="#+id/starLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/postAuthorLayout"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/postAuthorLayout"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:id="#+id/star"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="5dp"
android:background="?attr/selectableItemBackground"
android:src="#drawable/ic_toggle_star_outline_24" />
<TextView
android:id="#+id/postNumStars"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
tools:text="7" />
</LinearLayout>
<include layout="#layout/include_post_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/postAuthorLayout"
android:layout_marginLeft="5dp"
android:layout_marginTop="10dp" />
</RelativeLayout>
</android.support.v7.widget.CardView>
include_post_author.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:id="#+id/postAuthorPhoto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_action_account_circle_40" />
<TextView
android:id="#+id/postAuthor"
style="#style/Base.TextAppearance.AppCompat.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:gravity="center_vertical"
tools:text="someauthor#email.com" />
</LinearLayout>
include_post_text.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical">
<TextView
android:id="#+id/postTitle"
style="#style/TextAppearance.AppCompat.Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="1"
android:textStyle="bold"
tools:text="My First Post" />
<TextView
android:id="#+id/postBody"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
tools:text="Hallo Welt" />
</LinearLayout>

#Christoph M. The Fragment Transaction if you want to applu on ui u need to give a FrameLayout Id.
Create a FrameLayout with one id in your main class then attach your fragment to id value
like this below
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
FirstFragment fragment = new FirstFragment();
FragmentTransaction transaction =
getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, fragment);
transaction.addToBackStack(ConstantVariables.FirstFragment);
transaction.commit();
}
<?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">
<FrameLayout
android:id="#+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>

Images not inflated in viewpager and recyclerview

My image is not showing in the viewpager, I have the xml with viewpager at the top and recyclerview at the bottom.
I do not know if I need to do implementation with interfaces. I follow the image slider example from here at Android Studio Tutorial - 70 - Implement Swipe Views
public class Home_activity extends BaseActivity {
ViewPager viewPager;
TextView testview;
private static final String urlHome =
"http://www.androidbegin.com/tutorial/jsonparsetutorial.txt";
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private List<ListItem> listItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
viewPager = (ViewPager) findViewById(R.id.viewPager);
SwipeAdapter swipeAdapter = new
SwipeAdapter(getSupportFragmentManager());
viewPager.setAdapter(swipeAdapter);
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
listItems = new ArrayList<>();
loadRecyclerViewData();
}
<--- PageFagment.java--->
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class PageFragment extends Fragment {
public PageFragment() {
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup
container, Bundle savedInstanceState) {
TextView textView;
View view = inflater.inflate(R.layout.image_fragment_layout, container,
false);
textView = (TextView) view.findViewById(R.id.textViewFragment);
Bundle bundle = getArguments();
final String message = Integer.toString(bundle.getInt("count "));
textView.setText("This id the " + message);
return view;
}
}
<--- SwipeAdapter.java--->
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class SwipeAdapter extends FragmentPagerAdapter {
public SwipeAdapter(FragmentManager fm) {
super(fm);
}
#Override
public android.support.v4.app.Fragment getItem(int i) {
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putInt("count ", i + 1);
fragment.setArguments(bundle);
return fragment;
}
#Override
public int getCount() {
return 3;
}
}
this is the 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"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="9">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="3"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="150dp" />
</LinearLayout>
<LinearLayout
android:id="#+id/topbuttonlinearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="btn1" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="btn1" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="btn1" />
</LinearLayout>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/topbuttonlinearLayout"
android:layout_weight="7">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
<include layout="#layout/bottom_navigation_layout" />
</FrameLayout>
</LinearLayout>

Fragment layout not displaying anything?

IN this layout i have made tab layout with fragment activity and wanted to display few things,however nothing is being shown in fragment activity.
This is the base xml where the fragment is being made change.xml
<android.support.v4.widget.DrawerLayout 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/activity_change"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseParallaxMultiplier="0.5"
tools:context="com.example.alpit.formula2.Change">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/change_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/change"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.NoActionBar.PopupOverlay"></android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/change_tab"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:tabGravity="fill">
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/change_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/change_appbar"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</android.support.v4.view.ViewPager>
</RelativeLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_change"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="#menu/navigation_menu"
app:theme="#style/NavigationTheme">
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
This is the java code of the tab layout
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Distance extends Fragment {
protected View onCreate(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
return inflater.inflate(R.layout.activity_distance, container, false);
}
}
This is the xml code of distance
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_distance"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.alpit.formula2.Distance"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Weight in kg" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Weight in kg" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Weight in kg"
android:textSize="100sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Weight in kg" />
</LinearLayout>
This is my java code of adding tabs in the layout
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.List;
class Change extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private ActionBarDrawerToggle toggle3;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_change);
Toolbar toolbar = (Toolbar) findViewById(R.id.change);
setSupportActionBar(toolbar);
DrawerLayout drawerLayout = (DrawerLayout) findViewById(R.id.activity_change);
toggle3 = new ActionBarDrawerToggle(this, drawerLayout, R.string.open, R.string.Close);
drawerLayout.addDrawerListener(toggle3);
toggle3.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_change);
navigationView.setItemIconTintList(null);
navigationView.setNavigationItemSelectedListener(this);
setTitle("Conversion");
viewPager = (ViewPager) findViewById(R.id.change_viewpager);
setUpViewpager(viewPager);
TabLayout tabs = (TabLayout) findViewById(R.id.change_tab);
tabs.setupWithViewPager(viewPager);
}
public boolean onOptionsItemSelected(MenuItem menuItem) {
if (toggle3.onOptionsItemSelected(menuItem)) {
return true;
}
return onOptionsItemSelected(menuItem);
}
private void setUpViewpager(ViewPager upViewpager) {
Adapter_tab adapter = new Adapter_tab(getSupportFragmentManager());
adapter.addFragment(new Distance(), "Distance");
adapter.addFragment(new Mass(), "Mass");
upViewpager.setAdapter(adapter);
}
#Override
public boolean onNavigationItemSelected(MenuItem item) {
return false;
}
static class Adapter_tab extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public Adapter_tab(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentTitleList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}

just add onCreateView in Distance

how can i switch other fragment layout programmatically in Android?

I' ve got two layouts (layout_first.xml and layout_second.xml).
I want to show layout_second, after click a Button (Show Second) in layout_first. And get an EditText value in the layout_first to set EditText value in the layout_second programmaticaly. How can i do this? Thanks for your answers.
my codes:
activity_main.xml
<android.support.design.widget.CoordinatorLayout
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="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="#dimen/custom_tab_layout_height"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:ads="http://schemas.android.com/apk/res-auto"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
layout_first.xml
<LinearLayout 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:orientation="horizontal"
android:focusable="true"
android:background="#bc8383"
android:id="#+id/content_frame">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Second"
android:id="#+id/btnShowSecond"
android:layout_weight="0.18" />
<EditText
android:id="#+id/et1"
android:text="et1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#000000"
android:elegantTextHeight="false"
android:maxLength="20"
android:singleLine="true"
android:textAlignment="center"
android:textColor="#85b27e"
android:textSize="40dp"
android:paddingLeft="3dp"
android:paddingRight="3dp"
android:layout_marginTop="10dp"
android:layout_weight="1" />
</LinearLayout>
layout_second.xml
<LinearLayout 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:orientation="vertical"
android:focusable="true"
android:background="#bc8383">
<EditText
android:id="#+id/et2"
android:text="et2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#000000"
android:elegantTextHeight="false"
android:maxLength="20"
android:singleLine="true"
android:textAlignment="center"
android:textColor="#85b27e"
android:textSize="40dp"
android:paddingLeft="3dp"
android:paddingRight="3dp"
android:layout_marginTop="10dp"
android:layout_gravity="center_horizontal" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="btn2"
android:id="#+id/btn2"
android:layout_gravity="center_horizontal" />
</LinearLayout>
custom_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tab"
android:textColor="#color/colorAccent"
android:textSize="14dp"
android:gravity="center"
android:fontFamily="#string/font_fontFamily_medium"/>
MainActivity.java
package xmaxsoft.delfragment;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
TextView tabOne = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabOne.setText("One");
tabLayout.getTabAt(0).setCustomView(tabOne);
TextView tabTwo = (TextView) LayoutInflater.from(this).inflate(R.layout.custom_tab, null);
tabTwo.setText("Two");
tabLayout.getTabAt(1).setCustomView(tabTwo);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new First(), "One");
adapter.addFrag(new Second(), "Two");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
Second.java
package xmaxsoft.delfragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class Second extends Fragment {
public Second() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.layout_second, container, false);
String data = getArguments().getString("value");
et2.setText(data);
return view;
}
}
First.java
package xmaxsoft.delfragment;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
public class First extends Fragment {
public First() {
}
Button btnShowSecond;
EditText et1;
public void addFragment(Fragment fragment, boolean addToBackStack, String tag) {
FragmentManager manager = getFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
if (addToBackStack) {
ft.addToBackStack(tag);
}
ft.replace(R.id.aid1, fragment, tag);
ft.commitAllowingStateLoss();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.layout_first, container, false);
btnShowSecond = (Button) view.findViewById(R.id.btnShowSecond);
et1 = (EditText) view.findViewById(R.id.et1);
btnShowSecond.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//what kind of code must be here ???
//what kind of code must be here ???
//what kind of code must be here ???
Second myfragment = new Second();
Bundle bundle = new Bundle();
bundle.putString("value",et1.getText().toString());
myfragment.setArguments(bundle);
Activity.addFragment(myfragment, false,"Second");//error ??? cannot resolve method ???
}
});
return view;
}
}
How can i display or switch layout_second programmatically in layout_first? Thank you for your helps.

You can do this by using Intent class.
1. on First.java put this code in clicklistener
public void mybutton_click()
{
Second myfragment = new Second();
Bundle bundle = new Bundle();
bundle.putString("value",et1.getText());
myfragment.setArguments(bundle);
activity.addFragment(myfragment, false,
"Second");
}
To call other Fragment
public void addFragment(Fragment fragment, boolean addToBackStack,
String tag) {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
if (addToBackStack) {
ft.addToBackStack(tag);
}
ft.replace(R.id.content_frame, fragment, tag);
ft.commitAllowingStateLoss();
}
In Second.java put this on Oncreate():
String data = getArguments().getString("value");
et2.setText(data);