Android Studio & Firebase: Show ImageView on Full Screen

Android Studio & Firebase: Show ImageView on Full Screen - java

I have a screen that shows my movie names and their pictures which are in my Firebase. It shows them with the pictures.
My database's structure is like this. name is the string which is the name of my movie. profilePic is the string that contains the picture link from Firebase storage.
What I want is, when I click on any picture which are listed, I want to display it on another activity with bigger size (like opening someone's WhatsApp or Facebook profile picture)
These are my classes that works perfectly. How can I do this?
Movies.java
package com.example.XXXX;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.Toast;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.ChildEventListener;
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 Movies extends AppCompatActivity {
DatabaseReference reference;
RecyclerView recyclerView;
ArrayList<Profile> list;
MyAdapter adapter;
private String message;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movies);
recyclerView = (RecyclerView) findViewById(R.id.recyclerview_films);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
reference = FirebaseDatabase.getInstance().getReference().child("Films");
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
list = new ArrayList<Profile>();
for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren()){
Profile p = dataSnapshot1.getValue(Profile.class);
list.add(p);
}
adapter = new MyAdapter(Movies.this,list);
recyclerView.setAdapter(adapter);
findViewById(R.id.loadingPanel).setVisibility(View.GONE);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
Toast.makeText(Movies.this,"Ooops... Something is wrong.",Toast.LENGTH_SHORT).show();
}
});
Intent intent = getIntent();
message = intent.getStringExtra("EXTRA_MESSAGE");
ImageButton backButton = (ImageButton) findViewById(R.id.imageButton13);
backButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(Movies.this, Menu.class);
i.putExtra("EXTRA_MESSAGE",message);
startActivity(i);
overridePendingTransition(R.anim.slide_in_left,R.anim.slide_out_right);
}
});
}
#Override
public void onBackPressed() {
Intent i = new Intent(Movies.this, Menu.class);
i.putExtra("EXTRA_MESSAGE",message);
startActivity(i);
overridePendingTransition(R.anim.slide_in_left,R.anim.slide_out_right);
}
}
MyAdapter.java
package com.example.XXXX;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
Context context;
ArrayList<Profile> profiles;
public MyAdapter(Context c, ArrayList<Profile> p){
context = c;
profiles = p;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.cardview,viewGroup, false));
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder myViewHolder, int i) {
myViewHolder.name.setText(profiles.get(i).getName());
Picasso.get().load(profiles.get(i).getProfilePic()).into(myViewHolder.profilePic);
}
#Override
public int getItemCount() {
return profiles.size();
}
class MyViewHolder extends RecyclerView.ViewHolder{
TextView name;
ImageView profilePic;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.film_name);
profilePic = (ImageView) itemView.findViewById(R.id.filmProfile);
}
}
}
Profile.java
package com.example.XXXX;
public class Profile {
private String name;
private String profilePic;
public Profile() {
}
public Profile(String name, String profilePic) {
this.name = name;
this.profilePic = profilePic;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getProfilePic() {
return profilePic;
}
public void setProfilePic(String profilePic) {
this.profilePic = profilePic;
}
}
activity_movies.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=".Movies"
android:background="#drawable/background">
<include
android:id="#+id/toolbar_movies"
layout="#layout/toolbar_movies" />
<RelativeLayout
android:id="#+id/loadingPanel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:indeterminate="true" />
</RelativeLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="88dp"
android:layout_marginBottom="10dp">
<LinearLayout
android:id="#+id/layoutoffilms"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1"
android:layout_marginRight="10dp"
android:layout_marginLeft="10dp"
android:layout_marginBottom="10dp"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview_films"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</ScrollView>
</LinearLayout>
cardview.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="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#drawable/border"
android:layout_marginTop="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:id="#+id/filmProfile"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/film_name"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:layout_gravity="center_vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.08"
android:textSize="20sp"/>
</LinearLayout>
</LinearLayout>

Modify view holder with view as
class MyViewHolder extends RecyclerView.ViewHolder
{
TextView name;
ImageView profilePic;
View mView;
public MyViewHolder(#NonNull View itemView)
{
super(itemView);
mView = itemView;
name = (TextView) itemView.findViewById(R.id.film_name);
profilePic = (ImageView) itemView.findViewById(R.id.filmProfile);
}
}
Implement on click listener of view holder in adapter, then start the activity with image url.
#Override
public void onBindViewHolder(#NonNull MyViewHolder myViewHolder, int i) {
myViewHolder.name.setText(profiles.get(i).getName());
Picasso.get().load(profiles.get(i).getProfilePic()).into(myViewHolder.profilePic);
mViewHolder.mView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
startImageActivity(profiles.get(i).getProfilePic());
}
});
}
3.Create activity and start with image view of required dimension.
void startImageActivity(String imgUrl)
{
Intent intent = new Intent(context,ViewImage.class);
intent.putExtra("profilePic",imgUrl);
context.startActivity(intent);
}
Or to open image in an external application try
void startImageActivity(String imgUrl)
{
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(imgUrl));
context.startActivity(intent);
}

Resize your bitmap:
Bitmap resizedBitmap = Bitmap.createScaledBitmap(
originalBitmap, newWidth, newHeight, false);

You can use this library for the zoom in and zoom out functionality like this is the link Zoom library
You need to add this gradle in your project
implementation 'com.otaliastudios:zoomlayout:1.6.1'
Check this example layout below
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/dark_grey"
android:orientation="vertical"
android:weightSum="13">
<ImageView
android:id="#+id/iv_cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_margin="#dimen/margin_small"
android:padding="#dimen/margin_small"
android:src="#drawable/ic_skip" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="6" />
<com.otaliastudios.zoom.ZoomImageView
android:id="#+id/zoom_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="2"
android:scrollbars="vertical|horizontal"
app:alignment="center"
app:animationDuration="280"
app:flingEnabled="true"
app:horizontalPanEnabled="true"
app:maxZoom="2.5"
app:maxZoomType="zoom"
app:minZoom="0.7"
app:minZoomType="zoom"
app:overPinchable="true"
app:overScrollHorizontal="true"
app:overScrollVertical="true"
app:transformation="centerInside"
app:transformationGravity="auto"
app:verticalPanEnabled="true"
app:zoomEnabled="true" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="5" />
</LinearLayout>
And in the JAVA class you need to load the image like below, I am using the Glide for the image loading like below
GlideApp.with(this)
.asBitmap()
.load(YOUR_IMAGE_URL)
.into(new SimpleTarget<Bitmap>() {
#Override
public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {
YOUR_IMAGEVIEW.setImageBitmap(resource);
}
});
Check the ZoomActivity.java for the demo purpose like below
public class ZoomActivity extends AppCompatActivity {
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_zoom);
// ActivityZoomBinding mBinding = DataBindingUtil.setContentView(this, R.layout.activity_zoom);
ImageView zoomImage = findViewById(R.id.zoom_image);
///GETTING INTENT DATA
Intent intent = getIntent();
if (intent.hasExtra("ZOOM_IMAGE")) {
String imageUrl = intent.getStringExtra("ZOOM_IMAGE");
GlideApp.with(this)
.asBitmap()
.load(imageUrl)
.into(new SimpleTarget<Bitmap>() {
#Override
public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {
zoomImage.setImageBitmap(resource);
}
});
}
}
}

Related

Android RecyclerView Changes text to Image when scroll

Can anyone please help me out here???
Problem statement: I am making a chat application that is almost ready in ChatActivity. Functionality is the user can send images and text together but while sending text it's fine. The problem starts when I am sending images. And after sending when I scroll up to my all the texts start to change into the recently sent image.
ChatActivity.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"
android:background="#drawable/bg_light"
tools:context=".ChatActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/backArrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_back_arrow"
app:tint="#color/white" />
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/profile_image"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_marginStart="5dp"
android:padding="5dp"
android:src="#drawable/avatar"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/backArrow"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/userName"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="3dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="13dp"
android:fontFamily="#font/roboto"
android:text=""
android:textColor="#color/white"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/imageView7"
app:layout_constraintStart_toEndOf="#+id/profile_image"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/lastSeen"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="2dp"
android:fontFamily="#font/roboto_light"
android:text=""
android:textColor="#color/white"
android:textSize="12sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/imageView7"
app:layout_constraintStart_toEndOf="#+id/profile_image"
app:layout_constraintTop_toBottomOf="#+id/userName" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="-22dp" />
<androidx.constraintlayout.widget.Barrier
android:id="#+id/barrier2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:barrierDirection="left"
tools:layout_editor_absoluteX="395dp" />
<ImageView
android:id="#+id/imageView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_more"
app:tint="#color/white" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/chatRecyclerView"
android:layout_width="match_parent"
android:layout_height="611dp"
android:nestedScrollingEnabled="false">
</androidx.recyclerview.widget.RecyclerView>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="10dp"
android:layout_marginBottom="4dp">
<View
android:id="#+id/view14"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:background="#drawable/follow_active_btn"
app:layout_constraintBottom_toBottomOf="#+id/etMessage"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/etMessage" />
<EditText
android:id="#+id/etMessage"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginBottom="4dp"
android:background="#color/transparent"
android:ems="10"
android:hint="Message"
android:inputType="textMultiLine"
android:maxLines="4"
android:minHeight="48dp"
android:paddingStart="4dp"
android:paddingLeft="4dp"
android:paddingTop="8dp"
android:paddingBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/sendMessageImage"
app:layout_constraintStart_toStartOf="parent" />
<ImageView
android:id="#+id/sendMessage"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_marginEnd="8dp"
android:padding="4dp"
app:layout_constraintBottom_toBottomOf="#+id/etMessage"
app:layout_constraintEnd_toEndOf="#+id/view14"
app:layout_constraintTop_toTopOf="#+id/etMessage"
app:srcCompat="#drawable/comment"
app:tint="#color/purple_500" />
<ImageView
android:id="#+id/sendMessageImage"
android:layout_width="36dp"
android:layout_height="36dp"
android:padding="4dp"
app:layout_constraintBottom_toBottomOf="#+id/sendMessage"
app:layout_constraintEnd_toStartOf="#+id/sendMessage"
app:layout_constraintTop_toTopOf="#+id/sendMessage"
app:srcCompat="#drawable/clip"
app:tint="#color/black" />
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
ChatAdapter.java -
package com.codinggeekers.lmsbeta.Adapter;
import android.content.Context;
import android.media.Image;
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.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.resource.bitmap.CenterCrop;
import com.bumptech.glide.load.resource.bitmap.RoundedCorners;
import com.bumptech.glide.request.RequestOptions;
import com.codinggeekers.lmsbeta.Models.MessageModel;
import com.codinggeekers.lmsbeta.R;
import com.google.firebase.auth.FirebaseAuth;
import com.squareup.picasso.Picasso;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
public class ChatAdapter extends RecyclerView.Adapter {
ArrayList<MessageModel> list;
Context context;
int SENDER_VIEW_TYPE = 1;
int RECEIVER_VIEW_TYPE = 2;
public ChatAdapter(ArrayList<MessageModel> list, Context context) {
this.list = list;
this.context = context;
}
#Override
public long getItemId(int position) {
return position;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
if(viewType == SENDER_VIEW_TYPE) {
View view = LayoutInflater.from(context).inflate(R.layout.sample_sender, parent, false);
return new SenderViewHolder(view);
}
else {
View view = LayoutInflater.from(context).inflate(R.layout.sample_receiver, parent, false);
return new ReceiverViewHolder(view);
}
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
MessageModel message = list.get(position);
Timestamp ts = new Timestamp(message.getTimestamp());
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm a");
String time = simpleDateFormat.format(ts.getTime());
RequestOptions requestOptions = new RequestOptions();
requestOptions = requestOptions.transforms(new CenterCrop(), new RoundedCorners(10));
if(holder.getClass() == SenderViewHolder.class) {
if (message.getMsgImg()!=null) {
((SenderViewHolder)holder).senderImageLayout.setVisibility(View.VISIBLE);
((SenderViewHolder)holder).senderTextLayout.setVisibility(View.GONE);
// Picasso.get().load(message.getMsgImg()).placeholder(R.drawable.placeholder).into(((SenderViewHolder)holder).senderImage);
Glide.with(((SenderViewHolder)holder).itemView.getContext()).load(message.getMsgImg()).apply(requestOptions)
.placeholder(R.drawable.placeholder).into(((SenderViewHolder)holder).senderImage);
} else {
((SenderViewHolder)holder).senderMsg.setText(message.getMessage());
((SenderViewHolder)holder).senderTime.setText(time);
}
}
else {
if (message.getMsgImg()!=null) {
((ReceiverViewHolder)holder).receiverImageLayout.setVisibility(View.VISIBLE);
// Picasso.get().load(message.getMsgImg()).placeholder(R.drawable.placeholder).into(((ReceiverViewHolder)holder).receiverImage);
Glide.with(((ReceiverViewHolder)holder).itemView.getContext()).load(message.getMsgImg()).apply(requestOptions)
.placeholder(R.drawable.placeholder).into(((ReceiverViewHolder)holder).receiverImage);
} else {
((ReceiverViewHolder)holder).receiverMsg.setText(message.getMessage());
((ReceiverViewHolder)holder).receiverTime.setText(time);
}
}
}
#Override
public int getItemViewType(int position) {
if(list.get(position).getuId().equals(FirebaseAuth.getInstance().getUid())) {
return SENDER_VIEW_TYPE;
}
else {
return RECEIVER_VIEW_TYPE;
}
}
#Override
public int getItemCount() {
return list.size();
}
public class ReceiverViewHolder extends RecyclerView.ViewHolder {
TextView receiverMsg, receiverTime;
ImageView receiverImage;
ConstraintLayout receiverImageLayout;
public ReceiverViewHolder(#NonNull View itemView) {
super(itemView);
receiverMsg = itemView.findViewById(R.id.receiverText);
receiverTime = itemView.findViewById(R.id.receiverTime);
receiverImage = itemView.findViewById(R.id.receiverImage);
receiverImageLayout = itemView.findViewById(R.id.imageConstraintLayoutReceiver);
}
}
public class SenderViewHolder extends RecyclerView.ViewHolder {
TextView senderMsg, senderTime;
ImageView senderImage;
ConstraintLayout senderImageLayout;
ConstraintLayout senderTextLayout;
public SenderViewHolder(#NonNull View itemView) {
super(itemView);
senderMsg = itemView.findViewById(R.id.senderText);
senderTime = itemView.findViewById(R.id.senderTime);
senderImage = itemView.findViewById(R.id.senderImage);
senderImageLayout = itemView.findViewById(R.id.imageConstraintLayoutSender);
senderTextLayout = itemView.findViewById(R.id.textConstraintLayoutSender);
}
}
}
ChatActivity.java -
package com.codinggeekers.lmsbeta;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import com.codinggeekers.lmsbeta.Adapter.ChatAdapter;
import com.codinggeekers.lmsbeta.Models.MessageModel;
import com.codinggeekers.lmsbeta.databinding.ActivityChatBinding;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.Date;
public class ChatActivity extends AppCompatActivity {
ActivityChatBinding binding;
ProgressDialog dialog;
FirebaseAuth auth;
FirebaseDatabase database;
FirebaseStorage storage;
ActivityResultLauncher<String> galleryLauncher;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityChatBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
auth = FirebaseAuth.getInstance();
database = FirebaseDatabase.getInstance();
storage = FirebaseStorage.getInstance();
dialog = new ProgressDialog(this);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setTitle("Sending Image...");
dialog.setMessage("Please wait...");
dialog.setCancelable(false);
dialog.setCanceledOnTouchOutside(false);
// Sender and Receiver Ids
final String senderId = auth.getUid();
String receiveId = getIntent().getStringExtra("userId");
String userName = getIntent().getStringExtra("userName");
String profilePic = getIntent().getStringExtra("profilePic");
binding.userName.setText(userName);
Picasso.get().load(profilePic).placeholder(R.drawable.avatar).into(binding.profileImage);
binding.backArrow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(ChatActivity.this, UsersChatActivity.class);
startActivity(intent);
}
});
final ArrayList<MessageModel> messageModels = new ArrayList<MessageModel>();
final ChatAdapter chatAdapter = new ChatAdapter(messageModels, this);
binding.chatRecyclerView.setAdapter(chatAdapter);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setStackFromEnd(true);
binding.chatRecyclerView.setHasFixedSize(true);
binding.chatRecyclerView.setLayoutManager(layoutManager);
final String senderRoom = senderId + receiveId;
final String receiverRoom = receiveId + senderId;
database.getReference().child("Chats")
.child(senderRoom)
.addValueEventListener(new ValueEventListener() {
#SuppressLint("NotifyDataSetChanged")
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
messageModels.clear();
for (DataSnapshot snapshot1 : snapshot.getChildren()) {
MessageModel model = snapshot1.getValue(MessageModel.class);
messageModels.add(model);
}
chatAdapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
binding.sendMessage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String message = binding.etMessage.getText().toString();
if (message.matches("")) {
} else {
final MessageModel model = new MessageModel(senderId, message, "text");
model.setTimestamp(new Date().getTime());
binding.etMessage.setText("");
database.getReference().child("Chats")
.child(senderRoom)
.push()
.setValue(model).addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(#NonNull Void unused) {
database.getReference().child("Chats").child(receiverRoom).push().setValue(model).addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(#NonNull Void unused) {
}
});
}
});
}
}
});
binding.sendMessageImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
galleryLauncher.launch("image/*");
}
});
galleryLauncher = registerForActivityResult(new ActivityResultContracts.GetContent(), new ActivityResultCallback<Uri>() {
#Override
public void onActivityResult(Uri result) {
dialog.show();
final StorageReference reference = storage.getReference().child("chats")
.child(senderRoom).child(new Date().getTime() + "");
reference.putFile(result).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
#Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
reference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
#Override
public void onSuccess(Uri uri) {
final MessageModel model = new MessageModel(senderId, new Date().getTime(), uri.toString(), "image");
database.getReference()
.child("Chats")
.child(senderRoom)
.push()
.setValue(model).addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void unused) {
database.getReference().child("Chats").child(receiverRoom).push().setValue(model).addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void unused) {
dialog.dismiss();
binding.sendMessageImage.setImageURI(Uri.EMPTY);
Intent intent = getIntent();
finish();
startActivity(intent);
}
});
}
});
}
});
}
});
}
});
binding.userName.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(ChatActivity.this, FriendsProfileActivity.class);
intent.putExtra("userName", userName);
intent.putExtra("userId", receiveId);
intent.putExtra("profilePic", profilePic);
startActivity(intent);
}
});
}
}

ItemViewType should start at 0.
Try to change them to this:
int SENDER_VIEW_TYPE = 0;
int RECEIVER_VIEW_TYPE = 1;

NullPointerException on RecyclerView, there is no id mistake

I have checked several times the name of my layout RecyclerView as I show on other StackOverflow questions but it is correct. The error of the logcat is this:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.selfcial/com.example.selfcial.Models.MessageActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.LinearLayoutManager.setStackFromEnd(boolean)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3308)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3457)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7562)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.LinearLayoutManager.setStackFromEnd(boolean)' on a null object reference
at com.example.selfcial.Models.MessageActivity.onCreate(MessageActivity.java:69)
at android.app.Activity.performCreate(Activity.java:7893)
at android.app.Activity.performCreate(Activity.java:7880)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3283)
This is my my MessageActivity:
package com.example.selfcial.Models;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.widget.Toolbar;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.example.selfcial.Adapters.MessageAdapter;
import com.example.selfcial.R;
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;
import java.util.HashMap;
import java.util.List;
public class MessageActivity extends AppCompatActivity {
TextView username;
ImageView profile;
RecyclerView recyclerViewy;
EditText sendMsg;
ImageButton sendBtn;
FirebaseUser firebaseUser;
DatabaseReference reference;
Intent intent;
MessageAdapter messageAdapter;
List<Chat> chats;
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
profile = findViewById(R.id.imageview_profile);
username = findViewById(R.id.usernameLogin);
sendMsg = findViewById(R.id.writeMsg);
sendBtn = findViewById(R.id.sendBtn);
//RecyclerViewChat
recyclerView.findViewById(R.id.recycler_view_chat);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
linearLayoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(linearLayoutManager);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
intent = getIntent();
String id = intent.getStringExtra("id");
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
reference = FirebaseDatabase.getInstance().getReference("users").child(id);
sendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Convert edittext to string
String msg = sendMsg.getText().toString();
//Send message
if (!msg.equals("")) {
sendMessage(firebaseUser.getUid(), id, msg);
} else {
Toast.makeText(MessageActivity.this, "It's an empty message", Toast.LENGTH_SHORT).show();
}
sendMsg.setText("");
}
});
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
Users user = snapshot.getValue(Users.class);
username.setText(user.getUsername());
if (user.getImageUrl().equals("default")) {
profile.setImageResource(R.drawable.avatar);
} else {
Glide.with(MessageActivity.this)
.load(user.getImageUrl())
.into(profile);
}
readMessages(firebaseUser.getUid(), id, user.getImageUrl());
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
private void sendMessage(String sender, String receiver, String message) {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
HashMap<String, Object> hashMap = new HashMap<>();
hashMap.put("sender", sender);
hashMap.put("receiver", receiver);
hashMap.put("message", message);
reference.child("chats").push().setValue(hashMap);
}
private void readMessages(String myid, String id, String imgUrl) {
chats = new ArrayList<>();
reference = FirebaseDatabase.getInstance().getReference("chats");
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
chats.clear();
for (DataSnapshot snapshot1 : snapshot.getChildren()) {
Chat chat = snapshot1.getValue(Chat.class);
if (chat.getReceiver().equals(myid) && chat.getSender().equals(id) ||
chat.getReceiver().equals(id) && chat.getSender().equals(myid)) {
chats.add(chat);
}
messageAdapter = new MessageAdapter(MessageActivity.this, chats, imgUrl);
recyclerView.setAdapter(messageAdapter);
}
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
}
This is the MessageAdapter:
ackage com.example.selfcial.Adapters;
import android.content.Context;
import android.content.Intent;
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 com.bumptech.glide.Glide;
import com.example.selfcial.Models.Chat;
import com.example.selfcial.Models.MessageActivity;
import com.example.selfcial.Models.Users;
import com.example.selfcial.R;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import java.util.List;
public class MessageAdapter extends RecyclerView.Adapter<MessageAdapter.ViewHolder> {
private Context context;
private List<Chat> mChat;
private String imgUrl;
public static final int MSG_TYPE_LEFT = 0;
public static final int MSG_TYPE_RIGHT = 1;
//Firebase
FirebaseUser firebaseUser;
//Constructor
public MessageAdapter(Context context, List<Chat> mChat, String imgUrl) {
this.context = context;
this.mChat = mChat;
this.imgUrl = imgUrl;
}
#NonNull
#Override
public MessageAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view;
if (viewType == MSG_TYPE_RIGHT) {
view = LayoutInflater.from(context).inflate(R.layout.item_sent,
parent,
false);
}else {
view = LayoutInflater.from(context).inflate(R.layout.item_received,
parent,
false);
}
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MessageAdapter.ViewHolder holder, int position) {
Chat chat = mChat.get(position);
holder.show_message.setText(chat.getMessage());
if (imgUrl.equals("default")) {
holder.profile_image.setImageResource(R.drawable.avatar);
}else {
Glide.with(context)
.load(imgUrl)
.into(holder.profile_image);
}
}
#Override
public int getItemCount() {
return mChat.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView show_message;
private ImageView profile_image;
public ViewHolder(#NonNull View itemView) {
super(itemView);
show_message = itemView.findViewById(R.id.message);
profile_image = itemView.findViewById(R.id.profileImgReceive);
}
}
#Override
public int getItemViewType(int position) {
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
if (mChat.get(position).getSender().equals(firebaseUser.getUid())) {
return MSG_TYPE_RIGHT;
} else {
return MSG_TYPE_LEFT;
}
}
}
And this is the activity_message.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:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Models.MessageActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/imageview_profile"
android:layout_width="40dp"
android:layout_height="40dp"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="28dp"
tools:srcCompat="#drawable/avatar" />
<TextView
android:id="#+id/usernameLogin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Username"
android:textColor="#color/white"
android:layout_marginLeft="23dp" />
</androidx.appcompat.widget.Toolbar>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view_chat"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#F8E1E1"
app:layout_constraintBottom_toTopOf="#+id/cardView5"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar" />
<androidx.cardview.widget.CardView
android:id="#+id/cardView5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageButton
android:id="#+id/sendVoice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_weight="1"
android:background="#android:color/transparent"
android:contentDescription="TODO"
app:srcCompat="#drawable/ic_mic" />
<ImageButton
android:id="#+id/photoBtn"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:background="#00FFFFFF"
android:scrollbarThumbHorizontal="#color/black"
android:scrollbarThumbVertical="#color/black"
app:srcCompat="#drawable/ic_baseline_camera_alt_24" />
<ImageButton
android:id="#+id/gallery"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:background="#android:color/transparent"
app:srcCompat="#drawable/ic_gallery" />
<EditText
android:id="#+id/writeMsg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="7dp"
android:layout_marginBottom="0dp"
android:layout_weight="1"
android:background="#drawable/msg_shape"
android:ems="10"
android:hint="Bb"
android:inputType="textCapSentences"
android:padding="5dp" />
<ImageButton
android:id="#+id/sendBtn"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:background="#00FFFFFF"
android:scrollbarThumbHorizontal="#color/black"
android:scrollbarThumbVertical="#color/black"
app:srcCompat="#drawable/ic_send" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
Is the error occured by a mistake on the MessageAdapter or is it a bug somewhere else? I also tried to change LinearLayoutManager line to LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this); but this didn't work too.

You call findViewById() here:
recyclerView.findViewById(R.id.recycler_view_chat);
But you are calling the findViewById() method on your recyclerView variable, not assigning the result of your Activity's findViewById() to your variable, so your variable is always null.
recyclerView = findViewById(R.id.recycler_view_chat);

Intro slide helper by viewPager

i wanted to use intro slider to my App
i learned it by this video https://www.youtube.com/watch?v=byLKoPgB7yA&t=22s
I do like video tutorial but I have a problem with dots
when I slide to any page the dots(. ) will be copy and increase
where is my problem and what should I do ?
package time.one.just.show.introslyder;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Html;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private ViewPager mSlideViewPager;
private LinearLayout mDotsLayout;
private SlyderAdapter slyderAdapter;
//dots of any Slide pages
private TextView[] mDots;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSlideViewPager = findViewById(R.id.viewPager);
mDotsLayout = findViewById(R.id.dots);
slyderAdapter = new SlyderAdapter(this);
mSlideViewPager.setAdapter(slyderAdapter);
addDotsIndiccator(0);
mSlideViewPager.addOnPageChangeListener(viewListener);
}
private void addDotsIndiccator(int position) {
mDots = new TextView[3];
for (int i = 0; i < mDots.length; i++) {
mDots[i] = new TextView(this);
mDots[i].setText(Html.fromHtml("&#8226"));
mDots[i].setTextSize(35);
mDots[i].setTextColor(getResources().getColor(R.color.colorWhiteNearToGray));
mDotsLayout.addView(mDots[i]);
}
if (mDots.length > 0) {
mDots[position].setTextColor(getResources().getColor(R.color.colorWite));
}
}
ViewPager.OnPageChangeListener viewListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int i, float v, int i1) {
}
#Override
public void onPageSelected(int i) {
addDotsIndiccator(i);
}
#Override
public void onPageScrollStateChanged(int i) {
}
};}
And this is my SideAdapter class
package time.one.just.show.introslyder;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class SlyderAdapter extends PagerAdapter {
Context context;
LayoutInflater layoutInflater;
public SlyderAdapter(Context context) {
this.context = context;
}
public int[] slide_imagesArray = {
R.drawable.eat,
R.drawable.men,
R.drawable.sleep};
public String[] slide_headerArray = {
"EAT", "men", "code"};
public String[] slide_descriptionArray = {
"this is 1st", "this is 2nd", "this is 3rd"
};
#Override
public int getCount() {
return slide_headerArray.length;
}
#Override
public boolean isViewFromObject(#NonNull View view, #NonNull Object o) {
return view == o;
}
#NonNull
#Override
public Object instantiateItem(#NonNull ViewGroup container, int position) {
layoutInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(R.layout.slide_layoout, container, false);
ImageView slideImageView = (ImageView) view.findViewById(R.id.slideImage);
TextView slideheader = (TextView) view.findViewById(R.id.slideheader);
TextView slidedescription = (TextView) view.findViewById(R.id.slideDescription);
slideImageView.setImageResource(slide_imagesArray[position]);
slideheader.setText(slide_headerArray[position]);
slidedescription.setText(slide_descriptionArray[position]);
container.addView(view);
return view;
}
#Override
public void destroyItem(#NonNull ViewGroup container, int position, #NonNull Object object) {
container.removeView((RelativeLayout) object);
}
}
and this is my SliderLayout
<?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"
android:orientation="vertical"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView
android:id="#+id/slideImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="89dp"
app:srcCompat="#drawable/eat" />
<TextView
android:id="#+id/slideheader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="122dp"
android:layout_marginBottom="287dp"
android:text="بدون نیاز به اینترنت"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="#+id/slideDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="0dp"
android:layout_marginBottom="171dp"
android:text="آرشیو کامل این خواننده محبوب همیشه در جیب شم ، ، هر کدام ز آهنگ ها را خواستید می توانید دانلود کنید و هر زمان دلتون خوست به آن ها گوش بدهید حتی بدون نیز به اینترنت" />
</RelativeLayout>
and activtymain 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:background="#drawable/main_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="#+id/dots"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:orientation="horizontal"></LinearLayout>
</RelativeLayout>

I found a solution
just by add this inside my App
mDotsLayout.removeAllViews();
thank you all

java.lang.ClassCastException: android.support.constraint.ConstraintLayout cannot be cast to android.support.v7.widget.CardView

I am making a project for the first, I followed a Youtube tutorial on RecycleView but when I compile my project and launch the app on Android Studio my app crashes. I followed exactly what the video showed but it's possible that some components are not working the same way since.
This is the Output I get :
java.lang.ClassCastException: android.support.constraint.ConstraintLayout cannot be cast to android.support.v7.widget.CardView
at e.user.popcorn.RecyclerViewAdapter$MyViewHolder.<init>(RecyclerViewAdapter.java:78)
at e.user.popcorn.RecyclerViewAdapter.onCreateViewHolder(RecyclerViewAdapter.java:33)
at e.user.popcorn.RecyclerViewAdapter.onCreateViewHolder(RecyclerViewAdapter.java:16)
And this is the code
RecyclerViewAdapter.java
package e.user.popcorn;
import android.content.Context;
import android.content.Intent;
import android.media.Image;
import android.support.v7.widget.CardView;
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 java.util.List;
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {
private Context mContext ;
private List<movie_page> mData ;
public RecyclerViewAdapter(Context mContext, List<movie_page> mData) {
this.mContext = mContext;
this.mData = mData;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view ;
LayoutInflater mInflater = LayoutInflater.from(mContext);
view = mInflater.inflate(R.layout.layout_boxoffice_movie,parent,false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.tv_movie_title.setText(mData.get(position).getTitle());
holder.img_movie_thumbnail.setImageResource(mData.get(position).getThumbnail());
holder.cardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext,SelectedMovie.class);
// passing data to the book activity
intent.putExtra("Title",mData.get(position).getTitle());
intent.putExtra("Description",mData.get(position).getDescription());
intent.putExtra("Thumbnail",mData.get(position).getThumbnail());
intent.putExtra("Categorie",mData.get(position).getCategory());
// start the activity
mContext.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return mData.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder {
TextView tv_movie_title;
ImageView img_movie_thumbnail;
CardView cardView ;
public MyViewHolder(View itemView) {
super(itemView);
tv_movie_title = (TextView) itemView.findViewById(R.id.movie_title) ;
img_movie_thumbnail = (ImageView) itemView.findViewById(R.id.movie_poster);
cardView = (CardView) itemView.findViewById(R.id.movie_id);
}
}
}
And there is movie_page.java
package e.user.popcorn;
public class movie_page {
private String Title;
private String Category ;
private String Description ;
private int Thumbnail ;
public movie_page() {
}
public movie_page(String title, String category, String description, int thumbnail) {
Title = title;
Category = category;
Description = description;
Thumbnail = thumbnail;
}
public String getTitle() {
return Title;
}
public String getCategory() {
return Category;
}
public String getDescription() {
return Description;
}
public int getThumbnail() {
return Thumbnail;
}
public void setTitle(String title) {
Title = title;
}
public void setCategory(String category) {
Category = category;
}
public void setDescription(String description) {
Description = description;
}
public void setThumbnail(int thumbnail) {
Thumbnail = thumbnail;
}
}
Here is Layout_boxoffice_movie.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/movie_id"
android:clickable="true"
android:foreground="?android:attr/selectableItemBackground"
android:layout_width="120dp"
android:layout_height="200dp"
android:layout_margin="5dp"
xmlns:cardview="http://schemas.android.com/apk/res-auto">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorWhite">
<ImageView
android:id="#+id/movie_poster"
android:layout_width="match_parent"
android:layout_height="170dp"
android:scaleType="centerCrop"
android:background="#color/colorNavBackground"/>
<TextView
android:id="#+id/movie_title"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Movie Title"
android:gravity="center"
android:textColor="#color/colorNavBackground"/>
</LinearLayout>

You need to replace ConstraintLayout to CardView.
This will be your corrected code .
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/movie_id"
android:clickable="true"
android:foreground="?android:attr/selectableItemBackground"
android:layout_width="120dp"
android:layout_height="200dp"
android:layout_margin="5dp"
xmlns:cardview="http://schemas.android.com/apk/res-auto">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorWhite">
<ImageView
android:id="#+id/movie_poster"
android:layout_width="match_parent"
android:layout_height="170dp"
android:scaleType="centerCrop"
android:background="#color/colorNavBackground"/>
<TextView
android:id="#+id/movie_title"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Movie Title"
android:gravity="center"
android:textColor="#color/colorNavBackground"/>
</LinearLayout>
</android.support.v7.widget.CardView>

You care casting ConstraintLayout to CardView.
Change this line
<android.support.constraint.ConstraintLayout
with
android.support.v7.widget.CardView

Problem with below line
cardView = (CardView) itemView.findViewById(R.id.movie_id);
As per your layout xml file, You are using ConstraintLayout whereas You are using CardView in Your Java file. This is the real problem. You need to use CardView instead of ConstraintLayout.
Replace
<android.support.constraint.ConstraintLayout
With
<android.support.v7.widget.CardView
Also take care at closing tags

StaggeredGrid RecyclerView not showing anything

I'm trying to inflate a RecyclerView which has as StaggeredGrid Layout, but it is not showing anything. I've pretty much copied previous code I've used before for the RecyclerView so I'm kind of stumped.
In MuseumStoriesViewHolder.onCreateViewHolder() the return of holder has the following value ViewHolder{337ec22b position=-1 id=-1, oldPos=-1, pLpos:-1 unboundundefined adapter position no parent} I'm not sure if this is realated, but it was something that seemed off to me.
It also might help to know that the fragment I'm inflating this RecyclerView is a nested Fragment.
Any help would be greatly appreciated.
MuseumFragment
package com.example.android.radiobuttontestproject.fragments;
import android.app.Activity;
import android.os.Bundle;
import android.app.Fragment;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.android.radiobuttontestproject.R;
import com.example.android.radiobuttontestproject.adapters.MuseumStoriesAdapter;
import com.example.android.radiobuttontestproject.helpers.pojo.StoryObject;
import com.example.android.radiobuttontestproject.test.SampleDataFactory;
import java.util.List;
import butterknife.Bind;
import butterknife.ButterKnife;
public class MuseumFragment extends Fragment {
private List<StoryObject> storyObjectList;
private StaggeredGridLayoutManager storyGridLayoutManager;
private MuseumStoriesAdapter storyAdapter;
#Bind(R.id.stories_recycler_view) RecyclerView storiesRecyclerView;
public static MuseumFragment newInstance() {
MuseumFragment fragment = new MuseumFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
public MuseumFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_museum, container, false);
ButterKnife.bind(this, view);
//Sets up the stories
SampleDataFactory sampleDataFactory = new SampleDataFactory();
storyObjectList = sampleDataFactory.getSampleStories(
getResources().getStringArray(R.array.test_titles_for_grid_museum1),
getResources().getStringArray(R.array.test_desc_for_grid_museum1));
storyGridLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
storiesRecyclerView.setLayoutManager(storyGridLayoutManager);
storyAdapter = new MuseumStoriesAdapter(getActivity().getApplicationContext(), storyObjectList);
storiesRecyclerView.setAdapter(storyAdapter);
return view;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
}
MuseumStoriesAdapter
package com.example.android.radiobuttontestproject.adapters;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.example.android.radiobuttontestproject.R;
import com.example.android.radiobuttontestproject.helpers.pojo.StoryObject;
import java.util.List;
public class MuseumStoriesAdapter extends RecyclerView.Adapter<MuseumStoriesAdapter.MuseumStoriesViewHolder> {
private List<StoryObject> itemList;
private LayoutInflater inflater;
private Context context;
public MuseumStoriesAdapter(Context context, List<StoryObject> itemList) {
this.itemList = itemList;
this.context = context;
inflater = LayoutInflater.from(this.context);
}
#Override
public MuseumStoriesViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = inflater.inflate(R.layout.view_box_small, viewGroup, false);
MuseumStoriesViewHolder holder = new MuseumStoriesViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(MuseumStoriesViewHolder holder, int position) {
holder.title.setText(itemList.get(position).getTitle());
holder.desc.setText(itemList.get(position).getDescription());
}
#Override
public int getItemCount() {
return itemList.size();
}
class MuseumStoriesViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView type,title,desc;
public MuseumStoriesViewHolder(View itemView) {
super(itemView);
//Tried Butterknife, but it doesn't seem like it was working in the view holder. - Peter
type = (TextView) itemView.findViewById(R.id.small_box_type);
title = (TextView) itemView.findViewById(R.id.small_box_title);
desc = (TextView) itemView.findViewById(R.id.small_box_desc);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "Clicked Position = " + getPosition(), Toast.LENGTH_SHORT).show();
}
}
}
fragment_museum.xml
<ScrollView
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="com.example.android.radiobuttontestproject.fragments.MuseumFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="1">
<TextView
android:id="#+id/museum_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/header_margin"
android:gravity="center"
android:textSize="#dimen/font_larger"
android:text="#string/museum_header" />
<android.support.v7.widget.RecyclerView
android:id="#+id/stories_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>
view_box_small.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/small_box_margin"
android:background="#color/small_box_background_color">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!--TODO Make layout_height wrap contenet -->
<ImageView
android:layout_width="match_parent"
android:layout_height="120dp"
android:background="#color/test_color2"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:src="#drawable/abc_btn_rating_star_off_mtrl_alpha"
/>
</FrameLayout>
<TextView
android:id="#+id/small_box_type"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="#dimen/font_small"
android:textColor="#color/font_red"
android:text="Object"
/>
<TextView
android:id="#+id/small_box_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="#dimen/font_large"
android:textColor="#color/font_black"
android:text="Sample Text Here"
/>
<TextView
android:id="#+id/small_box_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="#dimen/font_normal"
android:textColor="#color/font_black"
android:textStyle="italic"
android:text="Sample Text Here"
/>
</LinearLayout>

Develop Reference

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

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StaggeredGrid RecyclerView not showing anything

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