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size of recycler view item changes when user scrolls down and up

I am working on a chat functionality to implement in my app. The purpose is that when a message comes from another user, the message item will align parent's start and when the user sends a message, it will align to the end. The send button on upper left corner simulates the other user sending a message. The problem is that when items recycles, some of them mathes the width of parent layout. I do not really understand why this happens and how to fix it. Thanks in advance...
package com.example.messageapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.app.Activity;
import android.content.Context;
import android.database.Observable;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Button sendBtn;
Button otherSendBtn;
EditText editText;
RecyclerView recyclerView;
MessagesAdapter adapter;
List<ChatMessage> messageList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
messageList=new ArrayList<>();
sendBtn=findViewById(R.id.sendBtn);
otherSendBtn=findViewById(R.id.otherSendBtn);
editText=findViewById(R.id.editText);
recyclerView=findViewById(R.id.recyclerView);
adapter=new MessagesAdapter(this,messageList);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
for(int i=0; i<4; i++){
if(i%2==0){
messageList.add(new ChatMessage("from him","self"));
}else{
messageList.add(new ChatMessage("from me","other"));
}
adapter.notifyItemInserted(messageList.size()-1);
}
otherSendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
messageList.add(new ChatMessage("random","other"));
adapter.notifyItemInserted(messageList.size()-1);
}
});
sendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String txt=editText.getText().toString();
messageList.add(new ChatMessage(txt, "self"));
adapter.notifyItemInserted(messageList.size()-1);
editText.setText("");
hideKeyboardFrom(MainActivity.this, view);
}
});
}
public static void hideKeyboardFrom(Context context, View view) {
InputMethodManager imm = (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
model class for messages
package com.example.messageapp;
public class ChatMessage {
public String text;
public String user;
public ChatMessage(String text, String user) {
this.text = text;
this.user = user;
}
}
recycler view adapter
package com.example.messageapp;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class MessagesAdapter extends RecyclerView.Adapter {
Context context;
List<ChatMessage> messages;
public void setMessages(List<ChatMessage> messages) {
this.messages = messages;
}
public MessagesAdapter(Context context, List<ChatMessage> messages) {
this.context = context;
this.messages = messages;
}
private static class MessageViewHolder extends RecyclerView.ViewHolder{
TextView textView;
RelativeLayout relativeLayout;
public MessageViewHolder(#NonNull View itemView) {
super(itemView);
textView=itemView.findViewById(R.id.messageTextView);
relativeLayout=itemView.findViewById(R.id.item_parent);
}
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v= LayoutInflater.from(context).inflate(R.layout.message_item,parent,false);
return new MessageViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
ChatMessage message=messages.get(position);
((MessageViewHolder) holder).textView.setText(message.text);
RelativeLayout.LayoutParams params= (RelativeLayout.LayoutParams) ((MessageViewHolder) holder).relativeLayout.getLayoutParams();
if(message.user.equals("self")){
params.addRule(RelativeLayout.ALIGN_PARENT_END);
((MessageViewHolder) holder).relativeLayout.setBackgroundColor(context.getResources().getColor(R.color.teal_200));
}else{
params.addRule(RelativeLayout.ALIGN_PARENT_START);
((MessageViewHolder) holder).relativeLayout.setBackgroundColor(context.getResources().getColor(R.color.purple_200));
}
((MessageViewHolder) holder).relativeLayout.setLayoutParams(params);
}
#Override
public int getItemCount() {
return messages.size();
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="10dp">
<RelativeLayout
android:id="#+id/item_parent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/teal_700">
<TextView
android:padding="10dp"
android:id="#+id/messageTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="#+id/otherSendBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="send"
android:layout_centerHorizontal="true"/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/otherSendBtn"
tools:listitem="#layout/message_item"/>
<RelativeLayout
android:id="#+id/linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toStartOf="#+id/sendBtn"
android:layout_marginEnd="5dp"/>
<Button
android:background="#drawable/ic_baseline_send_24"
android:id="#+id/sendBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"/>
</RelativeLayout>
</RelativeLayout>

Use External Database in Recyclerview

I try to lunch a recyclerview of external database. so i prepared mydatabase.db.zip and putt it into assets/database folder.after writing codes i found an error NullPointerException.i dont know where the problem is. please help
Data model:
package com.example.myapplication.DataModel;
public class Name {
public int id;
public String name;
public String meaning;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMeaning() {
return meaning;
}
public void setMeaning(String meaning) {
this.meaning = meaning;
}
}
MyDatabase.java
package com.example.myapplication;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.readystatesoftware.sqliteasset.SQLiteAssetHelper;
public class MyDatabase extends SQLiteAssetHelper {
private static final String DATABASE_NAME = "niniaad.db";
private static final int DATABASE_VERSION = 1;
private static final String TBL_NAME="names";
private static final String COL_ID="id";
private static final String COL_NAME="name";
private static final String COL_MEAN="mean";
public MyDatabase(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public Cursor getData(){
SQLiteDatabase sqLiteDatabase=this.getReadableDatabase();
Cursor cursor=sqLiteDatabase.rawQuery("SELECT * FROM "+TBL_NAME,null);
return cursor;
}
}
SecondRecycler.java
package com.example.myapplication;
import android.database.Cursor;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.RelativeLayout;
import com.example.myapplication.Adapter.NameAdapter;
import com.example.myapplication.Adapter.StudentAdapter;
import com.example.myapplication.DataModel.Name;
import com.example.myapplication.DataModel.Students;
import java.util.ArrayList;
import java.util.List;
public class SecondRecycler extends AppCompatActivity {
RecyclerView recyclerView;
List<Name> nameList;
MyDatabase myDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second_recycler);
setupviews();
getDataFromSqlite();
}
private void getDataFromSqlite() {
Cursor cursor= myDatabase.getData();
for (cursor.moveToFirst(); !cursor.isAfterLast() ; cursor.moveToNext()) {
Name name=new Name();
name.setName(cursor.getString(0));
name.setMeaning(cursor.getString(1));
nameList.add(name);
}
recyclerView.setAdapter(new NameAdapter(SecondRecycler.this,nameList));
}
private void setupviews() {
MyDatabase myDatabase=new MyDatabase(this);
recyclerView = (RecyclerView) findViewById(R.id.rv_secondrecycler);
recyclerView.setLayoutManager(new LinearLayoutManager(SecondRecycler.this));
}
}
Adapter
package com.example.myapplication.Adapter;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.myapplication.DataModel.Name;
import com.example.myapplication.R;
import java.util.List;
public class NameAdapter extends RecyclerView.Adapter<NameAdapter.NameViewHolder> {
public Context context;
public List<Name> nameList;
public NameAdapter(Context context, List<Name> nameList) {
this.context = context;
this.nameList = nameList;
}
#NonNull
#Override
public NameViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.secondrecycler_row, viewGroup, false);
return new NameViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull NameViewHolder nameViewHolder, int position) {
Name name = nameList.get(position);
nameViewHolder.txtName.setText(name.getName());
nameViewHolder.txtMean.setText(name.getMeaning());
}
#Override
public int getItemCount() {
return nameList.size();
}
public class NameViewHolder extends RecyclerView.ViewHolder {
TextView txtName, txtMean;
public NameViewHolder(#NonNull View itemView) {
super(itemView);
txtName = (TextView) itemView.findViewById(R.id.txt_name_Secondrecycler);
txtMean = (TextView) itemView.findViewById(R.id.txt_mean_seconrecycler);
}
}
}
activity_second_recycler.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SecondRecycler">
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_secondrecycler"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
recycler_row.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
tools:context=".SecondRecycler">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/txt_name_Secondrecycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textColor="#000"
tools:text="name"
android:textAlignment="center"
/>
<TextView
android:layout_below="#id/txt_name_Secondrecycler"
android:id="#+id/txt_mean_seconrecycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textColor="#FF0000"
tools:text="mean"
/>
</RelativeLayout>
</android.support.v7.widget.CardView>

RecyclerView not displaying all properties of arraylist

I am trying to make my first app using android studio. On the main activity I am trying to create a menu in the style of a grid using the RecyclerView. I want each menu option to have a title, description and a image.
Currently there are only 3 options on the menu whilst I'm testing. When I debug my app it kinda works but not as I expected. In that when it loads it shows the titles of the 3 options in my arrayList but not the descriptions or the images. I have checked that the description and image fields are correctly populated in my arrayList. I am not sure why it is only showing the titles? Below is my code.
code - XML
activity_main
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.mark.spanishapp.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/esp_menu"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.constraint.ConstraintLayout>
menu_layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#FFFFFF"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/title"
android:textStyle="bold"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="#+id/menuImg"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
code - Java
MainActivity
package com.example.mark.spanishapp;
import android.database.sqlite.SQLiteException;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private final static String TAG = "MainActivity";
DBHandler dbHandler = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHandler = new DBHandler(this);
try {
dbHandler.createDataBase();
}catch (IOException ioe){
throw new Error("unable to create database");
}
try{
dbHandler.openDataBase();
}catch (SQLException sqle)
{
Log.e(TAG, sqle.getMessage());
}
RecyclerView recyclerView = (RecyclerView)findViewById(R.id.esp_menu);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getApplicationContext(), 2);
recyclerView.setLayoutManager(layoutManager);
ArrayList<MenuEsp> menuList = dbHandler.Get_MenuList();
MyAdapter adapter = new MyAdapter(getApplicationContext(), menuList);
recyclerView.setAdapter(adapter);
}
}
MenuEsp
package com.example.mark.spanishapp;
public class MenuEsp {
public String getMenu() {
return menu;
}
public void setMenu(String menu) {
this.menu = menu;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getImageName() {
return imageName;
}
public void setImageName(String imageName) {
this.imageName = imageName;
}
private String menu;
private String description;
private String imageName;
}
MyAdapter
package com.example.mark.spanishapp;
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.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private ArrayList<MenuEsp> menuList;
private Context context;
public MyAdapter(Context context, ArrayList<MenuEsp> menuList){
this.context = context;
this.menuList = menuList;
}
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.menu_layout, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {
holder.title.setText(menuList.get(position).getMenu());
holder.img.setScaleType(ImageView.ScaleType.CENTER_CROP);
int id = this.context.getResources().getIdentifier(menuList.get(position).getImageName(), "drawable", this.context.getPackageName());
holder.img.setImageResource(id);
}
#Override
public int getItemCount() {
return menuList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView title;
private TextView descirption;
private ImageView img;
public ViewHolder(View view) {
super(view);
descirption = (TextView)view.findViewById(R.id.description);
title = (TextView)view.findViewById(R.id.title);
img = (ImageView) view.findViewById(R.id.menuImg);
}
}
}

Set value of description in onBindViewholder
ie
holder.descirption.setText(menuList.get(position).getDescription());
next,
change code from
int id = this.context.getResources().getIdentifier(menuList.get(position).getImageName(), "drawable", this.context.getPackageName());
holder.img.setImageResource(id);
To
holder.img.setImageResource(Integer.parseInt(menuList.get(position).getImageName()));

make changes to your onBindViewHolder() method in your Adapter class
int id = this.context.getResources().getIdentifier(menuList.get(position).getImageName(), "drawable", this.context.getPackageName());
holder.img.setImageResource(id);
holder.descirption.setText(menuList.get(position).getDescription());

Viewpager in Dialog?

I'm trying to have a dialog where you can click a "next" button to swipe right to the next screen. I am doing that with a ViewPager and adapter:
final Dialog dialog = new Dialog(this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.voicedialog);
dialog.setCanceledOnTouchOutside(false);
MyPageAdapter adapter = new MyPageAdapter();
ViewPager pager = (ViewPager) findViewById(R.id.viewpager);
pager.setAdapter(adapter);
However, I get a NullPointerException saying that pager is null. Why is this happening? Here is the Page Adapter class:
public class MyPageAdapter extends PagerAdapter {
public Object instantiateItem(ViewGroup collection, int position) {
int resId = 0;
switch (position) {
case 0:
resId = R.id.voice1;
break;
case 1:
resId = R.id.voice2;
break;
}
return collection.findViewById(resId);
}
#Override
public int getCount() {
return 2;
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
}
Here's my layout for the DIALOG:
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
Let me know on how to avoid this situation.
PS: Each of the layouts that should be in the view pager look like this, just diff. text:
<RelativeLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/voice2"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:text="Slide 1!"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textView2"
android:layout_gravity="center"
android:textSize="50sp" />
</RelativeLayout>

Without Using Enum Class
You should call findViewById on dialog. so for that you have to add dialog before findViewById..
Like this,
ViewPager pager = (ViewPager) dialog.findViewById(R.id.viewpager);
After solving your null pointer exception the other problem's solution here, if you wont use enum class you can use below code...
MainActivity.java
package demo.com.pager;
import android.app.Dialog;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn= (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final Dialog dialog = new Dialog(MainActivity.this);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.voicedialog);
dialog.setCanceledOnTouchOutside(false);
MyPageAdapter adapter = new MyPageAdapter(MainActivity.this);
ViewPager pager = (ViewPager) dialog.findViewById(R.id.viewpager);
pager.setAdapter(adapter);
dialog.show();
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="demo.com.pager.MainActivity">
<Button
android:id="#+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</RelativeLayout>
MyPageAdapter.java
package demo.com.pager;
import android.app.FragmentManager;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by rucha on 26/12/16.
*/
public class MyPageAdapter extends PagerAdapter {
Context mContext;
int resId = 0;
public MyPageAdapter(Context context) {
mContext = context;
}
public Object instantiateItem(ViewGroup collection, int position) {
/* int resId = 0;
switch (position) {
case 0:
resId = R.id.voice1;
break;
case 1:
resId = R.id.voice2;
break;
}
return collection.findViewById(resId);*/
LayoutInflater inflater = LayoutInflater.from(mContext);
switch (position) {
case 0:
resId = R.layout.fragment_blue;
break;
case 1:
resId = R.layout.fragment_pink;
break;
}
ViewGroup layout = (ViewGroup) inflater.inflate(resId, collection, false);
collection.addView(layout);
return layout;
}
#Override
public int getCount() {
return 2;
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
}
FragmentBlue.java
package demo.com.pager;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import android.support.v4.app.Fragment;
public class FragmentBlue extends Fragment {
private static final String TAG = FragmentBlue.class.getSimpleName();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_blue, container, false);
return view;
}
}
fragment_blue.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#4ECDC4">
</RelativeLayout>
voicedialog.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
Please check and reply.

Using Enum Class
Try this code, This is working if any doubt ask again. Happy to help.
MainActivity.java
package demo.com.dialogdemo;
import android.app.Dialog; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.Window; import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupUIComponents();
setupListeners();
}
private void setupUIComponents() {
button = (Button) findViewById(R.id.button);
}
private void setupListeners() {
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Dialog dialogItemDetails = new Dialog(MainActivity.this);
dialogItemDetails.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialogItemDetails.setContentView(R.layout.dialoglayout);
dialogItemDetails.getWindow().setBackgroundDrawable(
new ColorDrawable(Color.TRANSPARENT));
ViewPager viewPager = (ViewPager) dialogItemDetails.findViewById(R.id.viewPagerItemImages);
viewPager.setAdapter(new CustomPagerAdapter(MainActivity.this));
dialogItemDetails.show();
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="dialog" />
</RelativeLayout>
ModelObject1.java
public enum ModelObject1 {
RED(R.string.red, R.layout.fragment_one),
BLUE(R.string.blue, R.layout.fragment_two);
private int mTitleResId;
private int mLayoutResId;
ModelObject1(int titleResId, int layoutResId) {
mTitleResId = titleResId;
mLayoutResId = layoutResId;
}
public int getTitleResId() {
return mTitleResId;
}
public int getLayoutResId() {
return mLayoutResId;
}
}
CustomPagerAdapter.java
package demo.com.dialogdemo;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by rucha on 26/12/16.
*/
public class CustomPagerAdapter extends PagerAdapter {
private Context mContext;
public CustomPagerAdapter(Context context) {
mContext = context;
}
#Override
public Object instantiateItem(ViewGroup collection, int position) {
ModelObject1 modelObject = ModelObject1.values()[position];
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup layout = (ViewGroup) inflater.inflate(modelObject.getLayoutResId(), collection, false);
collection.addView(layout);
return layout;
}
#Override
public void destroyItem(ViewGroup collection, int position, Object view) {
collection.removeView((View) view);
}
#Override
public int getCount() {
return ModelObject1.values().length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#Override
public CharSequence getPageTitle(int position) {
ModelObject1 customPagerEnum = ModelObject1.values()[position];
return mContext.getString(customPagerEnum.getTitleResId());
}
}
dailoglayout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/txtHeaderTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:text="ITEM IMAGES"
android:textStyle="bold" />
<android.support.v4.view.ViewPager
android:id="#+id/viewPagerItemImages"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white" />
</RelativeLayout>
fragmentone.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="one"/>
</LinearLayout>

How to get value of a row in listview in android

I am new in android
The structure of my application consist of:
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.reyhane.myapplication.MainActivity">
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.design.widget.CoordinatorLayout>
cell.xml
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layoutDirection="rtl">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/nationalCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_marginLeft="8dp"
android:textStyle="bold" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_marginLeft="8dp"
android:textStyle="bold" />
<TextView
android:id="#+id/lastName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_marginLeft="8dp"
android:textStyle="bold" />
<Button
android:id="#+id/delete_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:text="حذف" />
</TableRow>
</TableLayout>
MainActivity.java
package com.example.reyhane.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Gravity;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import java.util.ArrayList;
public class MainActivity extends Activity {
public ListView list;
public ArrayList<Person> countries = new ArrayList<Person>();
public ListAdapter adapter;
public void fillPerson(String nationalCode) {
Person person = new Person();
person.setNationalCode(nationalCode);
person.setName("reza");
person.setLastName("hghgh");
person.setPhone("231345");
countries.add(person);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
fillPerson("6768767");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.list);
adapter = new ListAdapter(this);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View v, int position, long id) {
Object o = list.getItemAtPosition(position);
Person person = (Person) o;
openAddPersonActivity(person.getNationalCode());
}
});
}
public void openAddPersonActivity(String nationalCode) {
Intent i = new Intent(MainActivity.this, AddPerson.class);
if (nationalCode != null)
i.putExtra("nationalCode", nationalCode);
startActivity(i);
}
}
ListAdapter.java
package com.example.reyhane.myapplication;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TableLayout;
import android.widget.TextView;
/**
* Created by reyhane on 11/24/16.
*/
public class ListAdapter extends BaseAdapter {
MainActivity mainActivity;
ListAdapter(MainActivity mainActivity) {
this.mainActivity = mainActivity;
}
#Override
public int getCount() {
return mainActivity.countries.size();
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
static class ViewHolderItem {
TextView nationalCode;
TextView name;
TextView lastName;
TextView phone;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolderItem holder = new ViewHolderItem();
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mainActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.cell, null);
holder.nationalCode = (TextView) convertView.findViewById(R.id.nationalCode);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.lastName = (TextView) convertView.findViewById(R.id.lastName);
convertView.setTag(holder);
} else {
holder = (ViewHolderItem) convertView.getTag();
}
Button deleteBtn = (Button) convertView.findViewById(R.id.delete_btn);
holder.nationalCode.setText(this.mainActivity.countries.get(position).getNationalCode());
holder.name.setText(this.mainActivity.countries.get(position).getName());
holder.lastName.setText(this.mainActivity.countries.get(position).getLastName());
deleteBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//do something
mainActivity.countries.remove(position); //or some other task
notifyDataSetChanged();
}
});
return convertView;
}
}
My problem:
As you see in my application, i have list of person in listview.
In this form i add person and delete and edit it.
I can remove each record of listview but i can not get nationalCode value of person of each reacord in listview to fetch person from database by this nationalcode and edit it.
How do i do?
please help me

listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> arg0, View v, int arg2, long arg3)
{
String nationalcode = (String) ((TextView) v.findViewById(R.id.nationalcode)).getText();
Toast.makeText(getApplicationContext(), "NATIONAL CODE "+nationalcode, Toast.LENGTH_SHORT).show();
openAddPersonActivity(nationalcode);
}
});
Hope it helps.

try this :
openAddPersonActivity(countries.get(position).getNationalCode());
FYI, the list.setOnItemClick doesn't work
add this into your ListAdapter:
holder.nationalCode.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(mainActivity,"Country Code = "+MainActivity.countries.get(position).getNationalCode(),Toast.LENGTH_SHORT).show();
Intent i = new Intent(mainActivity, AddPerson.class);
if (nationalCode != null)
i.putExtra("nationalCode", nationalCode);
startActivity(i);
}
});
and if you click country code in listview item then it will detected;

You have not set countries list to your Listview adaptor.
When you are setting the adaptor, pass the countries list to listview adaptor.

It work successfully:
holder.nationalCode.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String nationalcode = (String) ((TextView) view.findViewById(R.id.nationalCode)).getText();
Toast.makeText(mainActivity, "NATIONAL CODE " + nationalcode, Toast.LENGTH_SHORT).show();
}
});

Try This
public void onItemClick(AdapterView<?> adapter, View v, int position, long id) {
Person person = countries.get(position);
openAddPersonActivity(person.getNationalCode());
}