Develop Reference

Not being able to switch the toolbar for a different activity [Fixed]

I am working with two activities here and I want to switch the action bar from the default MainActivity to the one that I want to have in this particular activity that just has a + symbol to add stuff to what will be a notepad, but I can't catch the error, the logcat is empty and I am just trying to figure out how to change the action bar from the one that is currently showing to the one I want.
Here is my activity in which I am trying to get the different action bar to work:
package com.example.projetolinguagensprogramacao1;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import androidx.appcompat.widget.Toolbar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
public class Notepad extends AppCompatActivity {
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notepad);
Toolbar toolbar2 = findViewById(R.id.toolbar2);
setSupportActionBar(toolbar2);
recyclerView = findViewById(R.id.listOfnotes);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.add_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item){
if(item.getItemId() == R.id.add_note){
Toast.makeText(this, "It's Working!", Toast.LENGTH_SHORT).show();
}
return super.onOptionsItemSelected(item);
}
}
Here is the .xml of it:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.example.projetolinguagensprogramacao1.Notepad">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar2"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:background="#color/colorPrimary" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/listOfnotes"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar2" />
</androidx.constraintlayout.widget.ConstraintLayout>
import android.content.Intent;
import android.os.Bundle;
import androidx.annotation.NonNull;
import android.view.MenuItem;
import android.view.Menu;
import com.google.android.material.navigation.NavigationView;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private AppBarConfiguration mAppBarConfiguration;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setNavigationViewListener();
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_lembrete, R.id.nav_listacompra, R.id.nav_poupanca, R.id.nav_login, R.id.nav_notepad)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
return NavigationUI.navigateUp(navController, mAppBarConfiguration)
|| super.onSupportNavigateUp();
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_login: {
startActivity(new Intent(this, Login.class));
break;
}
case R.id.nav_notepad: {
startActivity(new Intent(this, Notepad.class));
break;
}
}
return true;
}
private void setNavigationViewListener() {
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
}
And the .xml file for the + (plus) symbol that I want to show up on the action bar:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="#+id/add_note"
android:icon="#drawable/ic_add_symb"
android:title="Adicionar"
app:showAsAction="ifRoom" />
</menu>
Edit 1:
So instead of looking something like this:
It looks like this:
Edit 2: I tried using the same action bar in the main activity and it worked, so it just adds to my confusion as to why it isn't working in the Notepad activity.
Edit 3: Added Main Activity Code, I tried seeing if switching stuff on the onNavigationItemSelected() method and it still goes to image number 2. Maybe the problem is here I just can't find it.
Edit 4: I fixed it, I'm so sorry I am an idiot and didn't notice the blatant mistake I had, but thank you to all of you that answered and helped me.

you should create two menu file.xml
menu1(with its items) for MainActivity and menu2(with its items) for OtherActivity
then in each activity in onCreateOptionsMenu() method inflate its own menu.xml
check this code for short answer
check this for a mini project

Android Fragment not inflating after transaction

I've been trying to inflate a simple contentFragment after clicking on the tab from my navigation drawer. Here is my CentralView class that contains the attempt to inflate the Fragment
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.Toast;
#SuppressWarnings("deprecation")
public class CentralView extends AppCompatActivity {
private Toolbar toolbar;
private NavigationView navigationView;
private DrawerLayout drawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_central_view);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
navigationView = (NavigationView) findViewById(R.id.navigation_view);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()){
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.home:
Toast.makeText(getApplicationContext(),"Inbox Selected",Toast.LENGTH_SHORT).show();
ContentFragment fragment = new ContentFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
return true;
And here is my ContentFragment class
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by Admin on 04-06-2015.
*/
public class ContentFragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_content_fragment,container,false);
return v;
}
}
I've searched StackOverflow and while people have had similar issues, none of the fixes worked for me. Apologies if it's out there. Here is the XML for my content Fragment as well
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="INBOX"
android:padding="8dp"
android:textColor="#fff"
android:background="#color/colorPrimary"
android:textSize="28sp"
android:id="#+id/textView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
edit: adding activity_central_view.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".CentralView">
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
>
<include
android:id="#+id/toolbar"
layout="#layout/tool_bar"/>
<FrameLayout
android:id="#+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="#+id/navigation_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="start"
app:headerLayout="#layout/header"
app:menu="#menu/drawer"/>
</android.support.v4.widget.DrawerLayout>

I suspect your tool_bar layout might be having a height of match_parent.
Could you please share tool_bar file?

Why framentTransaction.commit doesn't work?

I'm trying to change the content of my content_navegacao.xml using fragments, but the commit appears to be not functional.
I created a project with a empty activity layout, after i created a navigation drawer activity and i'm trying to change the content of my fragment inside the navigation drawer layout. My transaction is managed inside Navigation_Drawer activity. I think, maybe the imports used in this case could be
responsible for this, because the Navigation Drawer Layout extends AppCompactAcivity class.
I did something like:
Create fragment inside content_navegacao:
<?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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="receitas.cleiton.com.br.receitas.Navegacao_Activity"
tools:showIn="#layout/app_bar_navegacao_">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/container_conteudo">
</LinearLayout>
</RelativeLayout>
Create Fragment Layout -> fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff0000">
</LinearLayout>
Create Fragment class
package receitas.cleiton.com.br.receitas;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Home_Fragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_home,null);
return view;
}
}
Finally, i made the last implemtations on my NavigationDrawerAcitvity class:
The Activity becomes like:
package receitas.cleiton.com.br.receitas;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class Navegacao_Activity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
FragmentManager fm = getSupportFragmentManager();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navegacao_);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
if(savedInstanceState == null){
Home_Fragment home_fragment = new Home_Fragment();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.add(R.id.container_conteudo,home_fragment,"home");
fragmentTransaction.addToBackStack("stack");
fragmentTransaction.commit();
}
}
But... when the activity is loaded, nothing happens.
Any Idea?

Try it after if(savedInstanceState == null){ without local variables.
getSupportFragmentManager().beginTransaction().replace(fragment, R.id.container, "home").addToBackStack("tag").commit();
P.S.I would not recommend to initialize variables immediately after their announcement. Do it in the onCreate () method ;

List Crashes App when updated

I'm trying to get a ListView to show the contents of a simple array but my program crashes at the setAdapeter line. As I understand this is supposed to be because the final value comes out as null but I don't see why that would be the case or how to fix it. I have already tried using ArrayAdapeter instead as well as catching the null exception with a try block. The former changes nothing and the latter simply shows a blank activity with no list to speak of. Please help.
Here's Main Activity
package ballton.fowdeckbuilder;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListAdapter;
import android.widget.ArrayAdapter;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnDecks = (Button) (findViewById(R.id.btnDecks));
Button btnCards = (Button) (findViewById(R.id.btnCards));
btnDecks.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, DeckCatalogue.class));
}
});
btnCards.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, CardCatalogue.class));
}
});
}
}
Here's the activity with the Problem
package ballton.fowdeckbuilder;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
public class DeckCatalogue extends AppCompatActivity {
ListView Ldecks;
String TAG = "TAG";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_deck_catalogue);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Ldecks = (ListView) (findViewById(R.id.DeckList));
String Decks[] = new String[] {"Faria","Melgis"};
ListAdapter feed = (new ArrayAdapter<String>(this, R.layout.show_deck, Decks));
Ldecks.setAdapter(feed);
}
}
Here's the Layout for that activity
<?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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="ballton.fowdeckbuilder.DeckCatalogue"
tools:showIn="#layout/activity_deck_catalogue">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/DeckList"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
And Here's the layout XML I use for the list times
<?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:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="#+id/Deck" />
</LinearLayout>

Use this code instead of yours:
ListAdapter feed = (new ArrayAdapter<String>(this, R.layout.show_deck, R.id.Deck, Decks));
This happened because you must supply the resource ID (as your xml: R.id.Deck) for the TextView you used for ListView.

fragment to activity Backstack returns blank view

I had Created a Home activity which includes Tablayout and Navigation Drawer onclick with fragment. I had included fragmentTransaction.addToBackStack(null).commit(); with the fragment transaction code to go back to previous Activity.
My Desired requirement was From Activity with tablayout-->NavigationDrawer-->Fragment1--> On BackButtonPress-->MainActivity with tablayout.
But,Now i am able to move to Fragment1,and when return to MainActivity,the view becomes filled with white(if i use mainLayout.removeAllViews(); and if wont use mainLayout.removeAllViews(); ,then the fragment is overlapping with the MainActivity)
1.My mainactivty
2.fragment
3.when i return to mainactivty
Now i cant see tablayout in my MainActivity.
Can anyone please help me.
mainactivity_layout.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"
android:paddingBottom="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
android:id="#+id/mainlayout"
tools:showIn="#layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rel">
<RelativeLayout
android:id="#+id/main_layout1"
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=".MainActivity">
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="#+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="#id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
MainActivity.java
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RelativeLayout;
import java.io.File;
import java.util.ArrayList;
public class HomeActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
TabLayout tabLayout1 = (TabLayout) findViewById(R.id.tab_layout1);
tabLayout1.addTab(tabLayout1.newTab().setIcon(R.drawable.tab_ic_home));
tabLayout1.addTab(tabLayout1.newTab().setIcon(R.drawable.tab_ic_map));
tabLayout1.addTab(tabLayout1.newTab().setIcon(R.drawable.tab_ic_login));
tabLayout1.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager1 = (ViewPager) findViewById(R.id.pager1);
final PagerAdapter1 adapter = new PagerAdapter1
(getSupportFragmentManager(), tabLayout1.getTabCount());
viewPager1.setAdapter(adapter);
viewPager1.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout1));
tabLayout1.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager1.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
// Handle navigation view item clicks here.
int id = item.getItemId();
RelativeLayout mainLayout=(RelativeLayout)findViewById(R.id.main_content);
if (id == R.id.nav_login) {
LoginFragment fragment = new LoginFragment();
// mainLayout.removeAllViews();
fragmentTransaction.replace(R.id.mainlayout, fragment);
fragmentTransaction.addToBackStack(null).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
Fragment.java
import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class ContactFragment extends Fragment implements OnMapReadyCallback {
private GoogleMap mMap;
Button call;
public ContactFragment() {
// Required empty public constructor
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_contact,container,false);
call = (Button) v.findViewById(R.id.button5);
call.setOnClickListener(new View.OnClickListener() {
#SuppressLint("NewApi")
#Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_DIAL);
i.setData(Uri.parse("tel:7034409615"));
startActivity(i);
}
});
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
return v;
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(9.2700, 76.7800);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Pathanamthitta"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}

As I suggested in the comments, in order to figure out the problem with displaying of fragments you can try to view what kind of fragments are being added into back stack as follows
Log.d("FragmentList",getSupportFragmentManager().getFragments().toString();
You can put it inside onBackPressed() ,onNavigationItemSelected()
According to your feedback it was helpful for you and you figured out the problem.
Also there are some layout design issues:
Your current approach is to adding fragment into relative layout. I believe it leads to some problems with view. The recommended approach is to add fragments into FrameLayout as described in docs
Also you may want to move everything outside view used for fragments
I have rewritten your layout following recommended guidelines in the docs. P.S I haven't tested how it displayed.. you may have to tweak some layout params.
<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--
Layout for fragments
-->
<FrameLayout
android:id="#+id/mainlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/app_bar_home">
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rel">
<RelativeLayout
android:id="#+id/main_layout1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" android:orientation="horizontal"/>
<android.support.v4.view.ViewPager
android:id="#+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="#id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
</LinearLayout>
Also You defined multiple activities in your layout like tools:context=".MainActivity" and tools:context=".HomeActivity" I guess it's just unedited copy paste, but may lead some issues as well.
Hope you find it useful :)

In your MainActivity.java add this:
protected OnBackPressedListener onBackPressedListener;
public interface OnBackPressedListener {
void doBack();
}
public void setOnBackPressedListener(OnBackPressedListener onBackPressedListener) {
this.onBackPressedListener = onBackPressedListener;
}
#Override
public void onBackPressed() {
if (onBackPressedListener != null)
onBackPressedListener.doBack();
else
super.onBackPressed();
}
Than in Fragment.java implements class like this:
implements MainActivity.OnBackPressedListener
And implements method:
#Override
public void doBack() {
Intent yourMainActivity = new Intent(getActivity(), MainActivity.class);
startActivity(yourMainActivity);
}

Rubin Nellikunnathu. I had the same issue. Make replacing of your NavigationView fragments in FrameLayout, not RelativeLayout. So you always would have TabLayout and ViewPager loaded.
Place it in mainactivity_layout.xml or in app_bar_home.xml (I do not see your full code, so you try these combinations).
mainactivity_layout.xml
<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"
android:paddingBottom="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
android:id="#+id/mainlayout"
tools:showIn="#layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rel">
<RelativeLayout
android:id="#+id/main_layout1"
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=".MainActivity">
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="#+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="#id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
// Replace NavigationView fragments in this FrameLayout
<FrameLayout
android:id="#+id/flForReplace"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".FrameLayout" />
</RelativeLayout>
and your code should be
fragmentTransaction.replace(R.id.flForReplace, fragment);
also replace fragmentTransaction.addToBackStack(null).commit(); with fragmentTransaction.commit(); as ρяσѕρєя K suggested.