Images not showing in List Firebase

Images not showing in List Firebase - java

When using a custom adapter in Firebase, I ran into a problem that everything works, but the pictures in the sheet are not displayed. Something incomprehensible is highlighted, but not her. It is necessary that they be in a normal sheet and they can be seen. I think it's because of the context in Picasso. The guide I followed had a wish(mContext) method that I can't use now. Please help, I don't understand what is the problem. I am attaching the image_item.xml code
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/text_view_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:text="Name"
android:textColor="#android:color/black"
android:textSize="20sp" />
<ImageView
android:id="#+id/image_view_upload"
android:layout_width="match_parent"
android:layout_height="200dp" />
</LinearLayout>
</androidx.cardview.widget.CardView>
activity_images
<?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=".ImagesActivity">
<ProgressBar
android:id="#+id/progress_circle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
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.recyclerview.widget.RecyclerView;
import com.squareup.picasso.Picasso;
import java.util.List;
public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {
private Context mContext;
private List<Upload> mUploads;
public ImageAdapter(Context context, List<Upload> uploads) {
mContext = context;
mUploads = uploads;
}
#Override
public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.image_item, parent, false);
return new ImageViewHolder(v);
}
#Override
public void onBindViewHolder(ImageViewHolder holder, int position) {
Upload uploadCurrent = mUploads.get(position);
holder.textViewName.setText(uploadCurrent.getName());
Picasso.get()
.load(uploadCurrent.getImageUrl())
.placeholder(R.mipmap.ic_launcher)
.fit()
.centerCrop()
.into(holder.imageView);
}
#Override
public int getItemCount() {
return mUploads.size();
}
public class ImageViewHolder extends RecyclerView.ViewHolder {
public TextView textViewName;
public ImageView imageView;
public ImageViewHolder(View itemView) {
super(itemView);
textViewName = itemView.findViewById(R.id.text_view_name);
imageView = itemView.findViewById(R.id.image_view_upload);
}
}
}
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.List;
public class ImagesActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private ImageAdapter mAdapter;
private ProgressBar mProgressCircle;
private DatabaseReference mDatabaseRef;
private List<Upload> mUploads;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_images);
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mProgressCircle = findViewById(R.id.progress_circle);
mUploads = new ArrayList<>();
mDatabaseRef = FirebaseDatabase.getInstance().getReference("uploads");
mDatabaseRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
Upload upload = postSnapshot.getValue(Upload.class);
mUploads.add(upload);
}
mAdapter = new ImageAdapter(ImagesActivity.this, mUploads);
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter);
mProgressCircle.setVisibility(View.INVISIBLE);
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(ImagesActivity.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
mProgressCircle.setVisibility(View.INVISIBLE);
}
});
}
}

Related

Unable to display contact list in Android Studio using RecyclerView

I am trying to display my contact list for my mobile application. I have already connected the database and I figured that there is no problem with the database since I can add new contact but I am unable to display the list. I use RecyclerView which I already created Adapter class, item layout and model for.
Adapter class - contAdapter.java
item layout - item.xml
Model - Contact
RecyclerView Layout - contactList.xml
contactList - to bind recyclerview with adapter
I wish to see the list of contact added to the database to be displayed on the screen but I have been stuck here for quite some time since I cannot figure out what the problem is :(
Here is my Contact Model:
public Contact() {
}
public Contact(String contName, String contNumber) {
this.contName = contName;
this.contNumber = contNumber;
}
public String getContName() {
return contName;
}
public void setContName(String contName) {
this.contName = contName;
}
public String getContNumber() {
return contNumber;
}
public void setContNumber(String contNumber) {
this.contNumber = contNumber;
}
contactList.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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" xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="25dp" tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/contList"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
contactList.java:
package com.example.lucentproj;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;`
import java.util.ArrayList;
public class contactList extends AppCompatActivity {
RecyclerView recyclerView;
DatabaseReference reference;
contAdapter adapter;
ArrayList<Contact> list;
FirebaseUser user;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_list);
user = FirebaseAuth.getInstance().getCurrentUser();
recyclerView = findViewById(R.id.contList);
reference = FirebaseDatabase.getInstance().getReference("Contact");
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
list = new ArrayList<>();
adapter = new contAdapter(this, list);
recyclerView.setAdapter(adapter);
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
Contact contact = dataSnapshot.getValue(Contact.class);
list.add(contact);
}
adapter.updateList(list);
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
}
item.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_margin="16dp"
app:cardElevation="8dp" app:cardCornerRadius="8dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:orientation="vertical"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal" />
<TextView
android:id="#+id/contname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="#font/amaranth"
android:text="Name"
android:layout_marginLeft="10dp"
android:layout_marginTop="8dp"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="#+id/contno"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:fontFamily="#font/amaranth_italic"
android:paddingLeft="10dp"
android:text="Number"
android:textSize="20dp"
android:textStyle="italic" />
<ImageView
android:id="#+id/cCall"
android:layout_width="38dp"
android:layout_height="30dp"
android:layout_marginLeft="280dp"
android:layout_marginTop="15dp"
android:clickable="true"
android:src="#drawable/call" />
<ImageView
android:id="#+id/cEdit"
android:layout_width="45dp"
android:layout_height="30dp"
android:layout_marginLeft="320dp"
android:layout_marginTop="15dp"
android:clickable="true"
android:src="#drawable/edit" />
</androidx.cardview.widget.CardView>
contAdapter:
package com.example.lucentproj;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup; import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class contAdapter extends RecyclerView.Adapter<contAdapter.ViewHolder> {Context context;
ArrayList<Contact> list;
public contAdapter(Context context, ArrayList<Contact> list) {
this.context = context;
this.list = list;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
Contact cont = list.get(position);
holder.cname.setText(cont.getContName());
holder.cnum.setText(cont.getContNumber());
}
#Override
public int getItemCount() {
return list.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView cname, cnum;
public ViewHolder(#NonNull View itemView) {
super(itemView);
cname = itemView.findViewById(R.id.contName);
cnum = itemView.findViewById(R.id.contNumber);
}
}
public void updateList(ArrayList<Contact> list){
this.list=list;
notifyDataSetChanged();
}
}

You are not updating list in Adaptor
Please add this method in your adaptor class -
public void updateList(ArrayList<Contact> list){
this.list=list;
notifyDataSetChanged();
}
And replace this line from your contactList activity to adapter.notifyDataSetChanged(); --> adapter.updateList(list);
contactList.java
package com.example.lucentproj;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;`
import java.util.ArrayList;
public class contactList extends AppCompatActivity {
RecyclerView recyclerView;
DatabaseReference reference;
contAdapter adapter;
ArrayList<Contact> list;
FirebaseUser user;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_list);
user = FirebaseAuth.getInstance().getCurrentUser();
recyclerView = findViewById(R.id.contList);
reference = FirebaseDatabase.getInstance().getReference("Contact");
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
list = new ArrayList<>();
myRef.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Contact contact = dataSnapshot.getValue(Contact.class);
list.add(contact);
}
}
adapter = new contAdapter(this, list);
recyclerView.setAdapter(adapter);
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
Contact contact = dataSnapshot.getValue(Contact.class);
list.add(contact);
}
adapter.updateList(list);
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
}

Making buttons in recyclerview and cardview clickable

I've added buttons into a a cardview and recyclerview. I'm struggling to make the buttons clickable. Every time I click the buttons it's actually registering the recyclerview as being clicked.
Activity containing cardview and recyclerview
package com.khumomashapa.notes.activities;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.khumomashapa.notes.R;
import com.khumomashapa.notes.adapter.RecyclerAdapter;
import com.khumomashapa.notes.arraylists.Messages;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
public class StoreActivity extends AppCompatActivity {
// Widget
RecyclerView recyclerView;
//Firebase
private DatabaseReference mref;
// Variable
private ArrayList<Messages> messagesList;
private RecyclerAdapter recyclerAdapter;
private Context mContext;
Button PurchaseBtn;
Button DownloadBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_store);
recyclerView = findViewById(R.id.products_view);
PurchaseBtn = (Button) findViewById(R.id.PurchaseBtn);
DownloadBtn = (Button) findViewById(R.id.DownloadBtn);
GridLayoutManager layoutManager = new GridLayoutManager(this, 2);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
PurchaseBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext()
,recyclerView, new RecyclerTouchListener.ClickListener() {
#Override
public void onClick(View view, int position) {
ImageView imageView = view.findViewById(R.id.ImageView);
Drawable mDrawable = imageView.getDrawable();
Bitmap mBitmap = ((BitmapDrawable)mDrawable).getBitmap();
Intent intent = new Intent(view.getContext(),PreviewActivity.class);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[]bytes = stream.toByteArray();
intent.putExtra("image", bytes);
startActivity(intent);
Messages messages = messagesList.get(position);
Toast.makeText(StoreActivity.this, "You have selected: "+ messages.getTitle(), Toast.LENGTH_SHORT).show();
}
#Override
public void onLongClick(View view, int position) {
}
#Override
public void onButtonClicks(View view, int position) {
}
})
);
// Firebase
mref = FirebaseDatabase.getInstance().getReference();
// Arraylist
messagesList = new ArrayList<Messages>();
// Clear arraylist
ClearAll();
// Get data Method
GetDataFromFirebase();
}
private void GetDataFromFirebase(){
Query query = mref.child("Wallpapers");
query.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
ClearAll();
for (DataSnapshot snapshot : dataSnapshot.getChildren()){
Messages messages = new Messages();
messages.setImage(snapshot.child("image").getValue().toString());
messages.setTitle(snapshot.child("title").getValue().toString());
messagesList.add(messages);
}
recyclerAdapter = new RecyclerAdapter(getApplicationContext(), messagesList);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
private void ClearAll(){
if(messagesList != null){
messagesList.clear();
if (recyclerAdapter !=null){
recyclerAdapter.notifyDataSetChanged();
}
}
messagesList = new ArrayList<Messages>();
}
}
Recycler Adapter
package com.khumomashapa.notes.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.khumomashapa.notes.R;
import com.khumomashapa.notes.activities.StoreActivity;
import com.khumomashapa.notes.arraylists.Messages;
import java.util.ArrayList;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private static final String Tag = "RecyclerView";
private Context mContext;
private ArrayList<Messages> messagesList;
Button PurchaseBtn;
Button DownloadBtn;
View imageView;
public RecyclerAdapter(Context mContext, ArrayList<Messages> messagesArrayList) {
this.mContext = mContext;
this.messagesList = messagesArrayList;
View imageView;
}
#NonNull
#Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.image, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
// Textview
holder.textView.setText(messagesList.get(position).getTitle());
holder.PurchaseBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
// Imageview: Glide library
Glide.with(mContext)
.load(messagesList.get(position).getImage())
.into(holder.imageView);
}
#Override
public int getItemCount() {
return messagesList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
// Widgets;
ImageView imageView;
TextView textView;
Button PurchaseBtn;
Button DownloadBtn;
View v;
public ViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.ImageView);
textView = itemView.findViewById(R.id.Title);
PurchaseBtn = itemView.findViewById(R.id.PurchaseBtn);
DownloadBtn = itemView.findViewById(R.id.DownloadBtn);
View v;
}
}
}
Recycler Touch Listener
package com.khumomashapa.notes.activities
import android.content.Context
import android.view.GestureDetector
import android.view.GestureDetector.SimpleOnGestureListener
import android.view.MotionEvent
import android.view.View
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.OnItemTouchListener
class RecyclerTouchListener(
context: Context?,
recyclerView: RecyclerView,
private val clickListener: ClickListener?
) :
OnItemTouchListener {
private val gestureDetector: GestureDetector
override fun onInterceptTouchEvent(recyclerView: RecyclerView, e: MotionEvent): Boolean {
val child = recyclerView.findChildViewUnder(e.x, e.y)
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, recyclerView.getChildAdapterPosition(child))
}
return false
}
override fun onTouchEvent(recyclerView: RecyclerView, e: MotionEvent) {}
override fun onRequestDisallowInterceptTouchEvent(disallowIntercept: Boolean) {}
interface ClickListener {
fun onClick(view: View?, position: Int)
fun onLongClick(view: View?, position: Int)
fun onButtonClicks(view: View?, position: Int)
}
init {
gestureDetector = GestureDetector(context, object : SimpleOnGestureListener() {
override fun onSingleTapUp(e: MotionEvent): Boolean {
return true
}
override fun onLongPress(e: MotionEvent) {
val child = recyclerView.findChildViewUnder(e.x, e.y)
if (child != null && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildAdapterPosition(child))
}
}
})
}
}
Cardview layout
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:contentPadding="5dp"
app:cardCornerRadius="10dp"
app:cardUseCompatPadding="true"
app:cardElevation="3dp"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/Imagelayout">
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:scaleType="centerCrop"
android:adjustViewBounds="true"
android:padding="2dp"
android:id="#+id/ImageView"
android:contentDescription="#string/image" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/Imagelayout">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/title"
android:textColor="#color/textColor"
android:textSize="20sp"
android:fontFamily="#font/biorhyme_extralight"
android:id="#+id/Title"/>
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/PurchaseBtn"
android:layout_width="350dp"
android:clickable="true"
android:layout_height="40dp"
android:layout_centerInParent="true"
android:onClick="purchase"
android:text="#string/purchase"
android:layout_below="#+id/Title"
android:background="#drawable/btn_rounded"
android:textColor="#color/textColor"
android:textSize="12sp"
app:cornerRadius="20dp"
android:focusable="true" />
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/DownloadBtn"
android:layout_width="350dp"
android:layout_height="40dp"
android:layout_below="#+id/PurchaseBtn"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:layout_marginTop="6dp"
android:background="#drawable/btn_rounded"
android:text="#string/download"
android:textColor="#color/textColor"
android:textSize="12sp"
android:visibility="invisible"
app:cornerRadius="20dp" />
</RelativeLayout>
</RelativeLayout>
</androidx.cardview.widget.CardView>
Recyclerview layout
<?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"
tools:context=".activities.StoreActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/products_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout >
Another issue I know I'll encounter is the null reference exception.
How do I reference the buttons from the cardview layout when the content view is set to be shown from the other one.

Recyclerview (No adapter attached; skipping layout)

i'm just setup my RecyclerView but there's not appear in my emulator & there is error "E/RecyclerView: No adapter attached; skipping layout" Could you guys help me to find my failure?
This is my application layout :
Click here to see my application layout view
StockContent.Java (Fragment) :
package com.example.psmandroidapps;
import androidx.annotation.Nullable;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import androidx.core.graphics.drawable.RoundedBitmapDrawable;
import androidx.core.graphics.drawable.RoundedBitmapDrawableFactory;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.media.Image;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.Toolbar;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;
public class StockContent extends Fragment {
RecyclerView StockRecyclerView;
List<ModalClass> mList;
CustomAdapter customAdapter;
public StockContent() {
// Required empty public constructor
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View stockview = inflater.inflate(R.layout.stock_content, container, false);
StockRecyclerView = stockview.findViewById(R.id.StockRecyclerView);
customAdapter = new CustomAdapter(mList,getContext());
StockRecyclerView.setAdapter(customAdapter);
StockRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return stockview;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//just for sample only
mList = new ArrayList<>();
mList.add(new ModalClass(R.drawable.profilepicture,"Mitsubishi S-N50"));
mList.add(new ModalClass(R.drawable.logodetail,"Mitsubishi S-N50"));
mList.add(new ModalClass(R.drawable.logo,"Mitsubishi S-N50"));
mList.add(new ModalClass(R.drawable.profilepicture,"Mitsubishi S-N50"));
mList.add(new ModalClass(R.drawable.logodetail,"Mitsubishi S-N50"));
mList.add(new ModalClass(R.drawable.logo,"Mitsubishi S-N50"));
}
}
StockContent.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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F3FFFC">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/StockRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</androidx.recyclerview.widget.RecyclerView>
</LinearLayout>
Stock_CardView.XML (for recyclerview content) :
<?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"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardCornerRadius="15dp"
android:layout_margin="20dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<androidx.cardview.widget.CardView
android:layout_width="100dp"
android:layout_height="100dp"
app:cardCornerRadius="30dp"
android:layout_margin="15dp"
android:layout_weight="0.1">
<ImageView
android:id="#+id/img_goodspicture"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/profilepicture"
android:scaleType="centerCrop"/>
</androidx.cardview.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1"
android:layout_marginTop="10dp"
android:layout_marginRight="15dp"
>
<TextView
android:id="#+id/txt_goodsname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Mitsubishi S-N10 (220V)"
android:textColor="#000000"
android:fontFamily="#font/sarabun_bold"
android:textSize="21dp"
android:layout_marginBottom="0dp"/>
<TextView
android:id="#+id/txt_goodstype"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Jenis : Contactor"
android:textColor="#000000"
android:fontFamily="#font/sarabun_regular"
android:textSize="12.5dp" />
<TextView
android:id="#+id/txt_goodsstock"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Stok : 105 pcs"
android:textColor="#000000"
android:fontFamily="#font/sarabun_regular"
android:textSize="12.5dp"/>
<TextView
android:id="#+id/txt_dateofgoodsentry"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Tanggal masuk : 29/07/2020"
android:textColor="#000000"
android:fontFamily="#font/sarabun_regular"
android:textSize="12.5dp"/>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
ModalClass.Java :
package com.example.psmandroidapps;
public class ModalClass {
int image;
String text;
public ModalClass(int image, String text) {
this.image = image;
this.text = text;
}
public int getImage() {
return image;
}
public void setImage(int image) {
this.image = image;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
CustomAdapter.Java :
package com.example.psmandroidapps;
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.recyclerview.widget.RecyclerView;
import java.util.List;
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder> {
List<ModalClass> mList;
Context context;
public CustomAdapter(List<ModalClass> mList, Context context) {
this.mList = mList;
this.context = context;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.stock_cardview,parent,false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
holder.imageView.setImageResource(mList.get(position).getImage());
holder.textView.setText(mList.get(position).getText());
}
#Override
public int getItemCount() {
return mList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView textView;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
imageView=itemView.findViewById(R.id.img_goodspicture);
textView=itemView.findViewById(R.id.txt_goodsname);
}
}
}
Thats the code of mine.. the result is nothing, nothing showing in my emulator.. Thank you for read this question, hope you guys can help me to solve my problem here. Thank you guys! have a nice day

Android studio RecyclerView with firebase problem?

If i complete those edit text with what i want,it will show the info to my fire data base but in the recycler view never show the third holder(holder.textViewZ.setText(model.getWhy). Do you have any idea why is this happening?
This is my main activity
package com.example.incercarefirebase;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.graphics.ColorSpace;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.SuccessContinuation;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.net.IDN;
import java.util.HashMap;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private Button btnSaveRecycler;
private EditText etNAME, etSurrname, etZ;
private FirebaseRecyclerOptions<Model> options;
private DatabaseReference rootDatabaseref;
private FirebaseRecyclerAdapter<Model, MyViewHolder> adapter;
private RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etNAME = findViewById(R.id.etNAME);
etSurrname = findViewById(R.id.etSurrname);
etZ = findViewById(R.id.etZ);
btnSaveRecycler = findViewById(R.id.btnSaveRecycler);
recyclerView = findViewById(R.id.recyclerviewID);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
rootDatabaseref = FirebaseDatabase.getInstance().getReference().child("Users");
btnSaveRecycler.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int id = Integer.parseInt(etNAME.getText().toString());
String name = etSurrname.getText().toString();
String why = etZ.getText().toString();
String key = rootDatabaseref.push().getKey();
rootDatabaseref.child(key).child("ID").setValue(id);
rootDatabaseref.child(key).child("Name").setValue(name);
rootDatabaseref.child(key).child("Why").setValue(why);
}
});
options = new FirebaseRecyclerOptions.Builder<Model>().setQuery(rootDatabaseref, Model.class).build();
adapter = new FirebaseRecyclerAdapter<Model, MyViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull MyViewHolder holder, int position, #NonNull Model model) {
holder.textviewName.setText(model.getName());
holder.textviewID.setText(model.getID());
holder.textViewZ.setText(model.getWhy());
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_view_layout, parent, false);
return new MyViewHolder(v);
}
};
adapter.startListening();
recyclerView.setAdapter(adapter);
}
}
This is my viewHolder
package com.example.incercarefirebase;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView textviewID, textviewName, textViewZ;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
textviewID = itemView.findViewById(R.id.textViewID);
textviewName = itemView.findViewById(R.id.textViewName);
textViewZ = itemView.findViewById(R.id.textViewZ);
}
}
This is my model
package com.example.incercarefirebase;
public class Model {
private int ID;
private String Name;
private String Why;
public Model() {
}
public Model(int ID, String name, String why) {
this.ID = ID;
Name = name;
Why = why;
}
public int getID() {
return ID;
}
public void setID(int ID) {
this.ID = ID;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getWhy() {
return Why;
}
public void setWhy(String why) {
Why = why;
}
}
This is the single_view_layout
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/textViewID"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="123"
android:textSize="30dp" />
<TextView
android:id="#+id/textViewName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Name..."
android:textSize="30dp" />
<TextView
android:id="#+id/textViewZ"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="aaaaa"
android:textSize="30dp" />
</LinearLayout>
This is the main 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:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:id="#+id/etNAME"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="ID"
android:inputType="textPersonName" />
<EditText
android:id="#+id/etSurrname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Name"
android:inputType="textPassword" />
<EditText
android:id="#+id/etZ"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword" />
<Button
android:id="#+id/btnSaveRecycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerviewID"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

How to center ImageView?

I have a RecyclerAdapter in which several images are horizontally placed. How to center each ImageView in item_custom
ListAdapter.java
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 android.widget.Toast;
import androidx.recyclerview.widget.RecyclerView;
import com.example.geometry.R;
import java.util.List;
public class ListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<ItemAdapter> mList;
private Context mContext;
public ListAdapter(List<ItemAdapter> list, Context context){
super();
mList = list;
mContext = context;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int i) {
View v = LayoutInflater.from(mContext).inflate(R.layout.item_custom, parent, false);
final ViewHolder viewHolder = new ViewHolder(v);
viewHolder.mImg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "Input mode = " + viewHolder.getAdapterPosition(), Toast.LENGTH_SHORT).show();
Builder.mode = viewHolder.getAdapterPosition();
}
});
return viewHolder;
}
#Override
public void onBindViewHolder( RecyclerView.ViewHolder viewHolder, int position) {
ItemAdapter itemAdapter = mList.get(position);
((ViewHolder) viewHolder).mImg.setImageResource(itemAdapter.getImage());
}
#Override
public int getItemCount() {
return mList.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView mTv_name;
public ImageView mImg;
public ViewHolder(View itemView) {
super(itemView);
mImg = (ImageView) itemView.findViewById(R.id.img_item);
}
}
}
ItemAdapter.java
public class ItemAdapter {
private int image;
public int getImage() {
return image;
}
public void setImage(int image) {
this.image = image;
}
}
MainActivity.java
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.RelativeLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.geometry.GUI.Builder;
import com.example.geometry.GUI.ItemAdapter;
import com.example.geometry.GUI.ListAdapter;
import com.example.geometry.Output.SolveActivity;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecycleView;
private List<ItemAdapter> mList = new ArrayList<>();
private ListAdapter mAdapter;
ListView listView;
RelativeLayout layout;
ImageButton solve_button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
init();
addList();
adapter();
}
private void init(){
setContentView(R.layout.activity_main);
layout = new RelativeLayout(this);
mRecycleView = findViewById(R.id.recycler_view);//new RecyclerView(this);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
mRecycleView.setLayoutParams(params);
}
private void addList(){
ItemAdapter itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.circle);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.line);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.move);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.angle);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.regular_triangle);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.right_triangle);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.square);
mList.add(itemAdapter);
itemAdapter = new ItemAdapter();
itemAdapter.setImage(R.drawable.trapeze);
mList.add(itemAdapter);
}
private void adapter(){
mAdapter = new ListAdapter(mList, this);
mRecycleView.setAdapter(mAdapter);
mRecycleView.setLayoutManager(new LinearLayoutManager(this, RecyclerView.HORIZONTAL, false));
mAdapter.notifyDataSetChanged();
}
}
activity_main.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">
<ImageButton
android:id="#+id/solve_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_margin="30dp"
android:background="#drawable/ic_calculator" />
<com.example.geometry.GUI.Builder
android:id="#+id/builder"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/recycler_view"
/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
/>
<EditText
android:id="#+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="Name" />
</RelativeLayout>
item_custom.java
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_margin="2dp"
android:background="#fff"
android:layout_height="wrap_content">
android:layout_gravity="center"
android:scaleType="center">
<ImageView
android:id="#+id/img_item"
android:layout_width="wrap_content"
android:contentDescription="#string/app_name"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:scaleType="center"
android:layout_centerInParent="true"/>
</RelativeLayout>

Change your item_custom according to my code
<?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"
android:layout_margin="2dp"
android:background="#fff">
<ImageView
android:id="#+id/img_item"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:src="#drawable/ic_search"
android:contentDescription="#string/app_name"
android:scaleType="center" />
</RelativeLayout>
Hope it will work definately tested by myself
Happy coding! Thankew!

Develop Reference

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