Android View InflateExeption showing up when trying to start an app

Android View InflateExeption showing up when trying to start an app - java

I'm new to android development, and I'm having issues with my app crashing when I'm trying to start it
This is the error message:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cybermath/com.example.cybermath.modules.MainActivity}: android.view.InflateException: Binary XML file line #25: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
And this is the XML file for the data within recycler viewer:
'''
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="100"
android:gravity="center_vertical"
android:background="#color/colorPrimaryDark"
>
<TextView
android:id="#+id/account_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="70"
android:background="#color/colorPrimary"
android:lines="1"
android:padding="10dp"
android:text="#string/app_name"
android:textColor="#color/colorText" >
</TextView>
<TextView
android:id="#+id/account_progress"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="20"
android:background="#color/colorPrimary"
android:text="Enter"
android:textSize="12sp"
android:textColor="#color/colorText"
>
</TextView>
'''
This is the XML for the MainActivity:
<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">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="416dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/informationView"
android:id="#+id/recyclerView">
</androidx.recyclerview.widget.RecyclerView>
<!--<TextView
android:id="#+id/informationView"
android:layout_width="408dp"
android:layout_height="50dp"
android:foregroundTint="#00050000"
android:paddingStart="10dp"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:paddingRight="10dp"
android:paddingBottom="10dp"
android:text="Choose an account"
android:textAlignment="center"
android:textColor="#000000"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.333"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</TextView>-->
</androidx.constraintlayout.widget.ConstraintLayout>
And here is the code for the MainActivity:
'''
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
// UI
private RecyclerView mRecyclerView;
// Variables
#NonNull
private ArrayList<Account> mAccounts = new ArrayList<>();
private AccountsRecyclerAdapter mAccountsRecyclerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_account_list);
mRecyclerView = findViewById(R.id.recyclerView);
initRecyclerView();
insertFakeAccounts();
}
private void insertFakeAccounts(){
for(int i = 0; i < 1000; i++){
Account account = new Account();
account.setName("title #" + i);
mAccounts.add(account);
}
mAccountsRecyclerAdapter.notifyDataSetChanged();
}
private void initRecyclerView(){
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(linearLayoutManager);
mAccountsRecyclerAdapter = new AccountsRecyclerAdapter(mAccounts);
mRecyclerView.setAdapter(mAccountsRecyclerAdapter);
}
'''
And my adapter public class AccountsRecyclerAdapter extends
RecyclerView.Adapter<AccountsRecyclerAdapter.ViewHolder> {
private ArrayList<Account> mAccounts = new ArrayList<>();
public AccountsRecyclerAdapter(ArrayList<Account> accounts) {
this.mAccounts = accounts;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int i) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_account_list, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull AccountsRecyclerAdapter.ViewHolder viewHolder, int i) {
viewHolder.name.setText(mAccounts.get(i).getName());
}
#Override
public int getItemCount() {
return mAccounts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView name;
public ViewHolder(#NonNull View itemView) {
super(itemView);
name = itemView.findViewById(R.id.account_name);
}
}

Some if the thing are not as per requirement may cause an exception. Check for condition as
if(yourValue !=null && yourValue.equals("desired value"){
//do your stuff
}

Related

how to get data from mysql database into recycler view?

I am making an app that let users create meetings and I would like the details of the meeting (eg name, type, location) in a recycler view.I ran the php code by itself and was able to get the values from the database.
Currently, I am getting an error of
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at in recyclerviewAdapter
holder.Name.setText(users.getName());
holder.Type.setText(users.getType());
holder.Location.setText(users.getLocation());
which is linked to
public class Users {
private String name,type,location;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
recyclerviewAdapter
public class UserAdapter extends RecyclerView.Adapter<UserAdapter.UserHolder>{
Context context;
List<Users> usersList;
public UserAdapter(Context context, List<Users> usersList) {
this.context = context;
this.usersList = usersList;
}
#NonNull
#Override
public UserHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View userLayout= LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_main2,parent,false);
return new UserHolder(userLayout);
}
#Override
public void onBindViewHolder(#NonNull UserHolder holder, int position) {
Users users=usersList.get(position);
holder.Name.setText(users.getName());
holder.Type.setText(users.getType());
holder.Location.setText(users.getLocation());
}
#Override
public int getItemCount() {
return usersList.size();
}
public class UserHolder extends RecyclerView.ViewHolder{
TextView Name,Type,Location;
public UserHolder(#NonNull View itemView){
super(itemView);
Name=itemView.findViewById(R.id.textTitle);
Type=itemView.findViewById(R.id.textType);
Location=itemView.findViewById(R.id.textLocation);
}
}
}
main activity code
public class MainActivity2 extends AppCompatActivity {
private static final String URL = "http://10.0.2.2/mad/activitydisplay.php";
RecyclerView recyclerView;
UserAdapter userAdapter;
List<Users> usersList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
recyclerView = findViewById(R.id.recylcerList);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
usersList=new ArrayList<>();
LoadAllUser();
}
private void LoadAllUser() {
JsonArrayRequest request =new JsonArrayRequest(URL, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray array) {
for (int i=0;i<array.length();i++){
try {
JSONObject object=array.getJSONObject(i);
String name=object.getString("eventname").trim();
String type=object.getString("type").trim();
String location=object.getString("location").trim();
Users user= new Users();
user.setName(name);
user.setType(type);
user.setLocation(location);
usersList.add(user);
} catch (JSONException e) {
e.printStackTrace();
}
}
userAdapter=new UserAdapter(MainActivity2.this,usersList);
recyclerView.setAdapter(userAdapter);
}
},new Response.ErrorListener(){
#Override
public void onErrorResponse(VolleyError error){
Toast.makeText(MainActivity2.this, error.toString(), Toast.LENGTH_SHORT).show();
}
});
RequestQueue requestQueue=Volley.newRequestQueue(MainActivity2.this);
requestQueue.add((request));
}
}
php code to get data from table
$sql="SELECT * FROM `activitytable` ";
$result=mysqli_query($conn,$sql);
$user=array();
while($row = mysqli_fetch_assoc($result)){
$index['eventname']=$row['eventname'];
$index['type']=$row['type'];
$index['location']=$row['location'];
array_push($user, $index);
}
echo json_encode($user);
activity_main2.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"
tools:context=".MainActivity2">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recylcerList"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
activity_list resource file
<?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">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal" >
<TextView
style="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Title:"
android:textColor="#color/black"
android:textSize="24dp" />
<TextView
android:id="#+id/textTitle"
style="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:textSize="24dp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal" >
<TextView
style="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Type:"
android:textColor="#color/black"
android:textSize="24dp" />
<TextView
android:id="#+id/textType"
style="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:textSize="24dp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal" >
<TextView
style="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Location:"
android:textColor="#color/black"
android:textSize="24dp" />
<TextView
android:id="#+id/textLocation"
style="bold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:textSize="24dp" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>

instead of
public UserHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View userLayout= LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_main2,parent,false);
return new UserHolder(userLayout);
}
use this
public UserHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View userLayout= LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_list ,parent,false);
return new UserHolder(userLayout);
}
because activity_main2 doesn't contain R.id.textTitle,R.id.textType,R.id.textLocation

check your xml(R.layout.activity_main2) looks like id of your view are from another layout

RecyclerView Items are not showing

FolderListAdapter Code
public class FolderListAdapter extends RecyclerView.Adapter<FolderListAdapter.myViewHolder> {
private final Context context;
private final ArrayList<Folder> folderList;
public FolderListAdapter(Context context, ArrayList<Folder> folderList) {
this.context = context;
this.folderList = folderList;
}
#NonNull
#Override
public myViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.folder_view, parent, false);
return new myViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull myViewHolder holder, int position) {
Folder folder = folderList.get(position);
Glide.with(context).load(folder.getFolder()).into(holder.imageView);
holder.folder_name.setText(folder.getFolder().getName());
holder.folder_item_count.setText(folder.getFilesList().size() + " Items");
}
#Override
public int getItemCount() {
return folderList.size();
}
public class myViewHolder extends RecyclerView.ViewHolder {
private final ShapeableImageView imageView;
private final TextView folder_name;
private final TextView folder_item_count;
public myViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.folder_image_view);
folder_name = itemView.findViewById(R.id.folder_name_text_view);
folder_item_count = itemView.findViewById(R.id.folder_items_count_text_view);
}
}
}
MainActivity Code for RecyclerView
FolderListAdapter adapter = new FolderListAdapter(this, folderList);
RecyclerView recyclerView = binding.folderRecyclerView;
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
XML CODE OF recycler view
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/folder_recyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
app:spanCount="2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:listitem="#layout/folder_view" />
folder_view.xml code.
<?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="wrap_content">
<com.google.android.material.imageview.ShapeableImageView
android:id="#+id/folder_image_view"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginTop="10dp"
android:scaleType="centerCrop"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:background="?android:attr/selectableItemBackground"
app:shapeAppearanceOverlay="#style/ShapeAppearanceOverlay.App.CornerSize50Percent"
tools:srcCompat="#tools:sample/backgrounds/scenic" />
<TextView
android:id="#+id/folder_name_text_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:text="Camera"
android:textColor="#android:color/primary_text_light"
android:textSize="16sp"
app:layout_constraintEnd_toEndOf="#+id/folder_image_view"
app:layout_constraintStart_toStartOf="#+id/folder_image_view"
app:layout_constraintTop_toBottomOf="#+id/folder_image_view" />
<TextView
android:id="#+id/folder_items_count_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="600 Items"
android:textSize="12sp"
app:layout_constraintStart_toStartOf="#+id/folder_name_text_view"
app:layout_constraintTop_toBottomOf="#+id/folder_name_text_view" />
</androidx.constraintlayout.widget.ConstraintLayout>
activity_folder.xml layout file
<?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=".ui.addFiles.FoldersActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/folder_recyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
OUTPUT
The size of folderList is 2
I also check the size of adapter. It is also 2
I also tried by making a new Adapter but it also does not work.
I don't know where I am making mistake and why it is now showing nothing in activity.

Change 1 :
In the xml set attribute android:layout_width="0dp" to android:layout_width="match_parent" and android:layout_height="0dp" to android:layout_height="match_parent"
Change 2 :
In your MainActivity code set LayoutManager to the RecyclerView before setting up adapter. so the code goes this way :
//Defining RecyclerView and setting LayoutManager
RecyclerView recyclerView = binding.folderRecyclerView;
FolderListAdapter adapter = new FolderListAdapter(this, folderList);
//Setting up Adapter
recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
recyclerView.setAdapter(adapter);

Why my page is lagging while click on "Daily Meal"

I am working on food delivery application. I have four tab in menu bar Home, Daily Meal, Favourite and My Cart. My all tab is work well but when I click on Daily Meal my page is rendering. What can I try next?
Here is my code:
daily_meal_fragment.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=".ui.DailyMeal.DailyMealFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/daily_meal_rec"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
daily_meal_ver.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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp">
<ImageView
android:id="#+id/imgview"
android:layout_width="match_parent"
android:layout_height="200dp"
android:scaleType="centerCrop"
android:src="#drawable/breakfast"
android:foreground="#drawable/blur"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/names"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/amita_bold"
android:text="Dinner"
android:textColor="#color/white"
android:textSize="40sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#+id/imgview"
app:layout_constraintEnd_toEndOf="#+id/imgview"
app:layout_constraintStart_toStartOf="#+id/imgview"
app:layout_constraintTop_toTopOf="#+id/imgview"
app:layout_constraintVertical_bias="0.3" />
<TextView
android:id="#+id/desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/amita"
android:text="Choose your best dinner"
android:textColor="#color/white"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/names" />
<TextView
android:id="#+id/discounts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/off_back"
android:padding="2sp"
android:text=" 20% OFF "
android:textColor="#FFFFFF"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#+id/imgview"
app:layout_constraintStart_toStartOf="#+id/imgview"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.821" />
</androidx.constraintlayout.widget.ConstraintLayout>
DailyMealModel.java
public class DailyMealModel {
int image;
String name;
String discount;
String description;
// getter setter and constructor
}
DailyMealFragment.java
public class DailyMealFragment extends Fragment {
RecyclerView recyclerView;
List<DailyMealModel> dailyMealModels;
DailyMealAdapter dailyMealAdapter;
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.daily_meal_fragment,container,false);
recyclerView = root.findViewById(R.id.daily_meal_rec);
dailyMealModels = new ArrayList<>();
dailyMealModels.add(new DailyMealModel(R.drawable.breakfast,"Breakfast","30% OFF","Description Description"));
dailyMealModels.add(new DailyMealModel(R.drawable.lunch,"Lunch","15% OFF","Description Description"));
dailyMealAdapter = new DailyMealAdapter(getContext(),dailyMealModels);
recyclerView.setAdapter(dailyMealAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
return root;
}
}
DailyMealAdapter.java
public class DailyMealAdapter extends RecyclerView.Adapter<DailyMealAdapter.viewholder> {
Context context;
List<DailyMealModel> list;
public DailyMealAdapter(Context context, List<DailyMealModel> list) {
this.context = context;
this.list = list;
}
#NonNull
#Override
public viewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new viewholder(LayoutInflater.from(parent.getContext()).inflate(R.layout.daily_meal_ver,parent,false));
}
#Override
public void onBindViewHolder(#NonNull viewholder holder, int position) {
holder.img.setImageResource(list.get(position).getImage());
holder.name.setText(list.get(position).getName());
holder.discount.setText(list.get(position).getDiscount());
holder.description.setText(list.get(position).getDescription());
}
#Override
public int getItemCount() {
return list.size();
}
public class viewholder extends RecyclerView.ViewHolder {
ImageView img;
TextView name,discount,description;
public viewholder(#NonNull View itemView) {
super(itemView);
img = itemView.findViewById(R.id.imgview);
name = itemView.findViewById(R.id.names);
description = itemView.findViewById(R.id.desc);
discount = itemView.findViewById(R.id.discounts);
}
}
}
Snapshot

As your attached screenshot,
please make sure all images and icons used in the app are lower sizes even loading dynamic images for that you can use tinypng.com or tinyjpg.com
also, using pagination in RecyclerView will improve your app performance.
and make sure JSON/XML list response is minimal.

unable to make proper ui like playstore

Hi i am developing an app where i have to make a ui like playtstore for that i saw this tutorial but now my problem is that i'm unable to add different
text for different rows and second is that even after setting height and width it doesnt seem to be get affected.
Please if someone can help me out here i'm stuck at this point
my code is as follows
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
int[] images = {R.drawable.vancouver,R.drawable.party,R.drawable.hands_ip,R.drawable.dj};
// Inflate the layout for this fragment
allSampleData = new ArrayList<SectionDataModel>();
createDummyData();
HorizontalAdapter firstAdapter = new HorizontalAdapter(images);
View view = inflater.inflate(R.layout.fragment_home, container, false);
NestedScrollView nestedScrollView = view.findViewById(R.id.scrollView);
llm = new LadderLayoutManager(1.5f, 0.85f, LadderLayoutManager.HORIZONTAL).
setChildDecorateHelper(new LadderLayoutManager
.DefaultChildDecorateHelper(getResources().getDimension(R.dimen.item_max_elevation)));
llm.setChildPeekSize((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
30, getResources().getDisplayMetrics()));
//llm.setReverse(true);
/*llm.setMaxItemLayoutCount(5);
rcv = (RecyclerView) view.findViewById(R.id.rcv);
rcv.setLayoutManager(llm);
new LadderSimpleSnapHelper().attachToRecyclerView(rcv);
adapter = new HSAdapter();
rcv.setAdapter(adapter);
multi_scroll_recyclerview = (RecyclerView)view.findViewById(R.id.multi_scroll_recyclerview);
multi_scroll_recyclerview.setNestedScrollingEnabled(false);
multi_scroll_layout_manager = new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL,false);
multi_scroll_recyclerview.setLayoutManager(multi_scroll_layout_manager);
multi_scroll_adapter = new RecyclerViewDataAdapter(getActivity(),allSampleData);
multi_scroll_recyclerview.setAdapter(multi_scroll_adapter);
multi_scroll_recyclerview.setHasFixedSize(true);*/
/* MultiSnapRecyclerView firstRecyclerView = (MultiSnapRecyclerView)view.findViewById(R.id.first_recycler_view);
LinearLayoutManager firstManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
firstRecyclerView.setLayoutManager(firstManager);
firstRecyclerView.setAdapter(firstAdapter);
HorizontalAdapter secondAdapter = new HorizontalAdapter(images);
MultiSnapRecyclerView secondRecyclerView =(MultiSnapRecyclerView) view.findViewById(R.id.second_recycler_view);
LinearLayoutManager secondManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
secondRecyclerView.setLayoutManager(secondManager);
secondRecyclerView.setAdapter(secondAdapter);
HorizontalAdapter thirdAdapter = new HorizontalAdapter(images);
MultiSnapRecyclerView thirdRecyclerView = (MultiSnapRecyclerView)view.findViewById(R.id.third_recycler_view);
LinearLayoutManager thirdManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
thirdRecyclerView.setLayoutManager(thirdManager);
thirdRecyclerView.setAdapter(thirdAdapter);*/
return view;
}
public void createDummyData() {
for (int i = 1; i <= 5; i++) {
SectionDataModel dm = new SectionDataModel();
dm.setHeaderTitle("Clubs");
dm.setHeadertitle2("Lounge");
dm.setHeadertitle3("Cafe");
dm.setHeadertitle4("Rooftop");
ArrayList<SingleItemModel> singleItem = new ArrayList<SingleItemModel>();
for (int j = 0; j <= 5; j++) {
singleItem.add(new SingleItemModel("Item " + j, "URL " + j));
}
dm.setAllItemsInSection(singleItem);
allSampleData.add(dm);//line which is causing issue
}
}
code for adapter
public class SectionListDataAdapter extends RecyclerView.Adapter<SectionListDataAdapter.SingleItemRowHolder> {
private ArrayList<SingleItemModel> itemsList;
private Context mContext;
public SectionListDataAdapter(Context context, ArrayList<SingleItemModel> itemsList) {
this.itemsList = itemsList;
this.mContext = context;
}
#Override
public SingleItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_single_card, null);
SingleItemRowHolder mh = new SingleItemRowHolder(v);
return mh;
}
#Override
public void onBindViewHolder(SingleItemRowHolder holder, int i) {
SingleItemModel singleItem = itemsList.get(i);
holder.tvTitle.setText(singleItem.getName());
/* Glide.with(mContext)
.load(feedItem.getImageURL())
.diskCacheStrategy(DiskCacheStrategy.ALL)
.centerCrop()
.error(R.drawable.bg)
.into(feedListRowHolder.thumbView);*/
}
#Override
public int getItemCount() {
return (null != itemsList ? itemsList.size() : 0);
}
public class SingleItemRowHolder extends RecyclerView.ViewHolder {
protected TextView tvTitle;
protected ImageView itemImage;
public SingleItemRowHolder(View view) {
super(view);
this.tvTitle = (TextView) view.findViewById(R.id.tvTitle);
this.itemImage = (ImageView) view.findViewById(R.id.itemImage);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Toast.makeText(v.getContext(), tvTitle.getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
}
My code for model class
public class SectionDataModel {
private String headerTitle,headertitle2,headertitle3,headertitle4;
private ArrayList<SingleItemModel> allItemsInSection;
public SectionDataModel() {
}
public SectionDataModel(String headerTitle, ArrayList<SingleItemModel> allItemsInSection) {
this.headerTitle = headerTitle;
this.allItemsInSection = allItemsInSection;
}
public String getHeaderTitle() {
return headerTitle;
}
public String getHeadertitle2() {
return headertitle2;
}
public String getHeadertitle3() {
return headertitle3;
}
public String getHeadertitle4() {
return headertitle4;
}
public void setHeaderTitle(String headerTitle) {
this.headerTitle = headerTitle;
}
public void setHeadertitle2(String headertitle2) {
this.headertitle2 = headertitle2;
}
public void setHeadertitle3(String headertitle3) {
this.headertitle3 = headertitle3;
}
public void setHeadertitle4(String headertitle4) {
this.headertitle4 = headertitle4;
}
public ArrayList<SingleItemModel> getAllItemsInSection() {
return allItemsInSection;
}
public void setAllItemsInSection(ArrayList<SingleItemModel> allItemsInSection) {
this.allItemsInSection = allItemsInSection;
}
}
listitem.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:selectableItemBackground"
android:orientation="vertical"
android:padding="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<com.ct.listrtrial.Custom.CustomTextViewMedium
android:id="#+id/itemTitle"
android:layout_width="0dp"
android:layout_weight="8"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_gravity="center_vertical"
android:layout_toLeftOf="#+id/btnMore"
android:text="Sample title"
android:textColor="#android:color/white"
android:textSize="27sp" />
<ImageView
android:id="#+id/btnMore"
android:layout_width="0dp"
android:layout_weight="0.8"
android:layout_marginTop="13dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:background="#drawable/ic_more_horiz_black_24dp"
android:textColor="#FFF" />
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view_list"
android:layout_width="match_parent"
android:layout_marginTop="10dp"
android:layout_height="160dp"
android:layout_gravity="center_vertical"
android:orientation="horizontal" />
</LinearLayout>
main fragment.xml
<android.support.v4.widget.NestedScrollView android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/scrollView"
android:fillViewport="true"
android:background="#color/colorPrimary"
xmlns:android="http://schemas.android.com/apk/res/android">
<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/rcv"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_gravity="center_horizontal"
android:layout_weight="1"
android:paddingBottom="10dp"
android:paddingTop="10dp" />
<android.support.v7.widget.RecyclerView
android:id="#+id/multi_scroll_recyclerview"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1">
</android.support.v7.widget.RecyclerView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
</LinearLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
listsinglecard.xml
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="220dp"
android:layout_marginLeft="18dp"
android:layout_height="200dp"
app:cardCornerRadius="65dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:selectableItemBackground"
android:orientation="vertical">
<ImageView
android:id="#+id/itemImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:scaleType="centerCrop"
android:src="#drawable/vancouver" />
<TextView
android:id="#+id/tvTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/itemImage"
android:gravity="center"
android:padding="5dp"
android:visibility="gone"
android:text="Sample title"
android:textColor="#android:color/black"
android:textSize="18sp" />
</LinearLayout>
</android.support.v7.widget.CardView>

Recycler View and Card View not displaying cards

This is my Activity:
public String id;
public String passPhrase;
public ArrayList<SongCell> songs;
private RecyclerView recyclerView;
private MyAdapter myAdapter;
private RecyclerView.LayoutManager layoutManager;
#TargetApi(Build.VERSION_CODES.JELLY_BEAN)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.songs_view_layout);
Context context = this.getApplicationContext();
Bundle stateData = getIntent().getExtras();
try
{
id = stateData.getString("id");
passPhrase = stateData.getString("passPhrase");
ArrayList data;
recyclerView = (RecyclerView) findViewById(R.id.song_list);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
data = new ArrayList<SongCell>();
for (int i=0; i<5;i++)
{
data.add(new SongCell("Song "+i,"Artist "+i, null));
}
myAdapter = new MyAdapter(data);
recyclerView.setAdapter(myAdapter);
}
catch(Exception e)
{
Log.d("Error: ", e.toString());
}
}
card.xml
<android.support.v7.widget.CardView android:layout_width="fill_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="6dp"
>
<ImageView
android:layout_width="70dp"
android:layout_height="70dp"
android:id="#+id/song_photo"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginRight="16dp"
android:background="#drawable/error" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/song_name"
android:textSize="30sp"
android:text="Song Name"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:textColor="#000000" />
<ImageButton
android:layout_width="60dp"
android:layout_height="60dp"
android:id="#+id/vote_button"
android:layout_alignParentRight="true"
android:layout_marginRight="8dp"
android:background="#drawable/arrow" />
</RelativeLayout>
</android.support.v7.widget.CardView>
Activity.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:background="#2d2d2d">
<TableLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableRow
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:paddingBottom="30dp"
android:layout_marginBottom="10dp"
android:background="#222222"></TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:paddingBottom="10dp">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ImageView
android:layout_width="70dp"
android:layout_height="70dp"
android:id="#+id/featSongImage1"
android:contentDescription="#string/newsongimage"
android:background="#drawable/error" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/songname"
android:id="#+id/featSongName1" />
<ImageButton
android:layout_width="25dp"
android:layout_height="25dp"
android:id="#+id/featSongButt1"
android:background="#drawable/arrow"
android:contentDescription="#string/votearrow" />
</LinearLayout>
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent"
android:foregroundGravity="fill_horizontal"
android:gravity="fill_horizontal|center">
<android.support.v7.widget.RecyclerView
android:id="#+id/song_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_horizontal" />
</TableRow>
</TableLayout>
</LinearLayout>
And this is my custom adapter
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
{
private ArrayList<SongCell> data;
public MyAdapter(ArrayList<SongCell> dataI)
{
data = dataI;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType)
{
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.song_card,viewGroup,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder viewholder, int pos) {
viewholder.songName.setText(data.get(pos).getName());
viewholder.artist.setText(data.get(pos).getArtist());
viewholder.image.setImageBitmap(data.get(pos).getArtwork());
}
#Override
public int getItemCount() {
return 0;
}
#Override
public int getItemViewType(int position) {
return 0;
}
public class ViewHolder extends RecyclerView.ViewHolder
{
TextView songName;
TextView artist;
ImageView image;
ImageButton voteButton;
public ViewHolder(View v)
{
super(v);
this.songName = (TextView) v.findViewById(R.id.song_name);
this.image = (ImageView) v.findViewById(R.id.song_photo);
this.voteButton = (ImageButton) v.findViewById(R.id.vote_button);
}
}
}
I have looked at a ton of guides on how to get this working but it still doesn't work. Anyone have any clue what's going on? I'm on version 25.0.1, and have all the modules imported. But it's not adding a single card into the layout.

I thought it would be difficult to debug such a big code you uploaded. But luckily my eye went on this line
#Override
public int getItemCount() {
return 0;
}
return 0; in adapter.
Your list size is always 0.
instead write this
#Override
public int getItemCount() {
return data.size();
}
EDIT-1:
You will also get null pointer exception here
viewholder.artist.setText(data.get(pos).getArtist());
Because you are not initializing the artist variable in ViewHolder class.
Edit-2
#Override
public int getItemCount() {
return 0;
}
you can remove this particular code from your adapter. Because overriding the methods of class that we don't use might sometimes result in errors that you can't even imagine.

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Android View InflateExeption showing up when trying to start an app - java

Some if the thing are not as per requirement may cause an exception. Check for condition as if(yourValue !=null && yourValue.equals("desired value"){ //do your stuff }

Related

how to get data from mysql database into recycler view?

RecyclerView Items are not showing

Why my page is lagging while click on "Daily Meal"

unable to make proper ui like playstore

Recycler View and Card View not displaying cards

Categories

Resources