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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>

ProgressBar does not appear in WebView located in Fragment ,how to show ProgressBar in WebView android?

Whenever, I enter the fragment, I am shown a blank space for a few seconds, then the webpage in the WebView shows up. It seems that the ProgressBar does not show.
Here's my XML file for the Fragment the WebView and ProgressBar is in
<?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"
android:orientation="vertical"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".FragmentThree">
<ProgressBar
android:id="#+id/progressbar"
style="#style/Widget.AppCompat.ProgressBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"/>
<WebView
android:id="#+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</WebView>
</RelativeLayout>
Here is the Java file for the Fragment Java implementation:
package com.example.task1;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
public class FragmentThree extends Fragment {
private WebView webView;
private String URL;
private ProgressBar progressBar;
private OnFragmentInteractionListener mListener;
public FragmentThree(String url) {
// Required empty public constructor
this.URL = url;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_three, container, false);
initMain(view);
return view;
}
private void initMain(View view) {
webView = view.findViewById(R.id.webview);
progressBar = view.findViewById(R.id.progressbar);
progressBar.setMax(100);
webView.loadUrl(URL);
webView.setWebViewClient(new WebViewClient());
webView.setWebChromeClient(new WebChromeClient(){
#Override
public void onProgressChanged(WebView view, int newProgress) {
progressBar.setProgress(newProgress);
}
});
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
The code is mostly located under the initMain() function for clarification.
Any advice is greatly appreciated, thank you for reading!

Just declare ProgressBar below Webview like this
<?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"
android:orientation="vertical"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".FragmentThree">
<WebView
android:id="#+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</WebView>
<ProgressBar
android:id="#+id/progressbar"
style="#style/Widget.AppCompat.ProgressBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"/>
</RelativeLayout>

How to Resize the toolbar according to the length of the title?

According to the fragment in which I am setting the title of my Toolbar, but some titles are very long and the App puts three points:
What I want is to display the full title, not decrease the size of the letter, if not increase the size of the toolbar so that if the title does not reach in a line that is put in a second as if it were a wrapcontent.
How is it possible to do this?
My toolbar in XML:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:id="#+id/toolbar"
android:layout_height="?attr/actionBarSize"
android:theme="#style/Toolbar" />
</LinearLayout>
Setting the title via Java
((NavigationDrawerActivity) activity)
.getSupportActionBar().setTitle(mytext);

I have developed a custom toolbar that tries to fit text as much as possible. You should set this custom Toolbar as action bar like this: https://developer.android.com/training/appbar/setting-up.
Here is my custom toolbar code:
MyToolbar.java:
package com.aminography.textapp;
import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v7.widget.AppCompatTextView;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.LayoutInflater;
public class MyToolbar extends Toolbar {
private AppCompatTextView mTitleTextView;
public MyToolbar(Context context) {
super(context);
mTitleTextView = LayoutInflater.from(context).inflate(R.layout.toolbar_title_layout, this).findViewById(R.id.titleTextView);
addView(mTitleTextView);
}
public MyToolbar(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
mTitleTextView = LayoutInflater.from(context).inflate(R.layout.toolbar_title_layout, this).findViewById(R.id.titleTextView);
addView(mTitleTextView);
}
public MyToolbar(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mTitleTextView = LayoutInflater.from(context).inflate(R.layout.toolbar_title_layout, this).findViewById(R.id.titleTextView);
addView(mTitleTextView);
}
#Override
public void setTitle(int resId) {
mTitleTextView.setText(resId);
}
#Override
public void setTitle(CharSequence title) {
mTitleTextView.setText(title);
}
#Override
public void setTitleTextColor(int color) {
mTitleTextView.setTextColor(color);
}
}
toolbar_title_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="16dp"
android:paddingRight="16dp">
<android.support.v7.widget.AppCompatTextView
android:id="#+id/titleTextView"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:autoSizeMinTextSize="9sp"
app:autoSizeStepGranularity="0.5sp"
app:autoSizeTextType="uniform" />
</FrameLayout>

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>

Android custom compound component's contents won't appear

I'm trying to create a custom view, a calendar. The views inside this component are inflated from a xml layout. I have studied several tutorials and three or four similar (or even identical) questions on stack overflow but nothing seems to work. I'd appreciate it if you could point out the problem. Thanks in advance and here are the codes.
kcalendar_view.xml // the layout for the custom view
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center" >
<Button
android:id="#+id/btnKCalendarNavLeft"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_margin="5dp"
android:background="#drawable/kcalendar_nav_button_bg"
android:text="<" />
<TextView
android:id="#+id/txvKCalendarNavTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="#+id/btnKCalendarNavRight"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_margin="5dp"
android:background="#drawable/kcalendar_nav_button_bg"
android:text=">" />
</LinearLayout>
<GridView
android:id="#+id/gridViewKCalendar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="7" >
</GridView>
</merge>
KCalendarView.java // the custom view's class
package ir.kcoder.KCalendarView;
import ir.kcoder.persiancalendarweather.R;
import java.util.Calendar;
import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.GridView;
import android.widget.LinearLayout;
import com.samanpr.jalalicalendar.JalaliCalendar;
import com.samanpr.jalalicalendar.JalaliCalendar.YearMonthDate;
public class KCalendarView extends LinearLayout {
private YearMonthDate currentJalaliDate;
private int parentWidth, parentHeight;
private Button leftButton, rightButton;
private GridView gridView;
private KCalendarAdapter calendarAdapter;
private Context context;
private View inflated;
public KCalendarView(Context context) {
super(context);
}
public KCalendarView(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
setOrientation(LinearLayout.VERTICAL);
setGravity(Gravity.CENTER);
setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflated = inflater.inflate(R.layout.kcalendar_view, this, true);
}
#Override
protected void onFinishInflate() {
super.onFinishInflate();
init(getContext());
}
private void init(Context context) {
Calendar c = Calendar.getInstance();
YearMonthDate currentGregDate = new YearMonthDate(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));
currentJalaliDate = JalaliCalendar.gregorianToJalali(currentGregDate);
leftButton = (Button)findViewById(R.id.btnKCalendarNavLeft);
rightButton = (Button)findViewById(R.id.btnKCalendarNavRight);
gridView = (GridView)findViewById(R.id.gridViewKCalendar);
if(gridView != null) {
calendarAdapter = new KCalendarAdapter(context, currentJalaliDate.getYear(),
currentJalaliDate.getMonth());
gridView.setAdapter(calendarAdapter);
}
}
public void nextMonth() {
}
public void prevMonth() {
}
// #Override
// protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// parentWidth = MeasureSpec.getSize(widthMeasureSpec);
// parentHeight = MeasureSpec.getSize(heightMeasureSpec);
// this.setMeasuredDimension(parentWidth, parentHeight);
// super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// }
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
}
}
activity_main.xml // I use this tag to include the custom view in my app
<ir.kcoder.KCalendarView.KCalendarView
android:id="#+id/kCalendarView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" >
</ir.kcoder.KCalendarView.KCalendarView>

Updated
Try this I think it should work
public class KCalendarView extends LinearLayout {
private YearMonthDate currentJalaliDate;
private int parentWidth, parentHeight;
private Button leftButton, rightButton;
private GridView gridView;
private KCalendarAdapter calendarAdapter;
public KCalendarView(Context context, AttributeSet attrs) {
super(context, attrs);
doInflate();
}
private void doInflate() {
setOrientation(LinearLayout.VERTICAL);
setGravity(Gravity.CENTER);
setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
inflate(getContext(), R.layout.kcalendar_view, this);
leftButton = (Button)findViewById(R.id.btnKCalendarNavLeft);
rightButton = (Button)findViewById(R.id.btnKCalendarNavRight);
gridView = (GridView)findViewById(R.id.gridViewKCalendar);
init();
}
private void init() {
Calendar c = Calendar.getInstance();
YearMonthDate currentGregDate = new YearMonthDate(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));
currentJalaliDate = JalaliCalendar.gregorianToJalali(currentGregDate);
calendarAdapter = new KCalendarAdapter(context, currentJalaliDate.getYear(), currentJalaliDate.getMonth());
gridView.setAdapter(calendarAdapter);
}
public void nextMonth() {
}
public void prevMonth() {
}
}