Develop Reference

i have used Bottom navigaion with navigation drawer both with fragments

I an Working On a project which uses navigation drawer with bottom navigation view
my navigation drawer is working fine but when i click any options from bottom navigation it gets selected but not shows anything in framelayout Here Is My XML File Please Help Me..
none of fragment of bottom navigation drawer are showing
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Home_Activity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="?attr/actionBarSize">
<FrameLayout
android:id="#+id/framelayout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="?android:attr/windowBackground"
android:soundEffectsEnabled="true"
app:itemIconTint="#color/yellow"
app:itemTextColor="#color/blue"
app:menu="#menu/bottom_nav" />
</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="#layout/navigation_drawer_header"
app:itemHorizontalPadding="40dp"
app:menu="#menu/navigation_menu" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#fecd99"
app:navigationIcon="#drawable/baseline_sort_24px" />
<FrameLayout
android:id="#+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</androidx.drawerlayout.widget.DrawerLayout>
And Here Is My Java File
package com.anshdev.anshapp;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.view.MenuItem;
import androidx.appcompat.widget.Toolbar;
import com.anshdev.anshapp.Navigation_drawer.about_us_fragment;
import com.anshdev.anshapp.Navigation_drawer.categories_fragment;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationView;
public class Home_Activity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
DrawerLayout drawerLayout;
NavigationView navigationView;
Toolbar toolbar;
Fragment fragment = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
/* <-------------------------Hooks--------------------->*/
drawerLayout = findViewById(R.id.drawer_layout);
navigationView = findViewById(R.id.nav_view);
toolbar = findViewById(R.id.toolbar);
/*<-------------------Tool Bar-------------->*/
setSupportActionBar(toolbar);
/*<-------------------NAVIGATION DRAWER MENU-------------->*/
navigationView.bringToFront();
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
navigationView.setNavigationItemSelectedListener(this);
navigationView.setCheckedItem(R.id.home_nav);
//--------------------BOTTOM NAVIGATION-----------------------
BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_nav);
bottomNavigationView.setOnNavigationItemSelectedListener(selectedListener);
//default-selected-bottom-nav
Home home = new Home();
FragmentTransaction ft1 = getSupportFragmentManager().beginTransaction();
ft1.replace(R.id.framelayout, home, null);
ft1.commit();
}
#Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.home_nav:
Intent intent = new Intent(this, Home_Activity.class);
startActivity(intent);
break;
case R.id.categories_nav:
fragment = new categories_fragment();
loadFragment(fragment);
drawerLayout.closeDrawer(GravityCompat.START);
break;
case R.id.about_us_nav:
fragment = new about_us_fragment();
loadFragment(fragment);
drawerLayout.closeDrawer(GravityCompat.START);
break;
}
drawerLayout.closeDrawer(GravityCompat.START);
return true;
}
private void loadFragment(Fragment fragment) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame, fragment).commit();
drawerLayout.closeDrawer(GravityCompat.START);
fragmentTransaction.addToBackStack(null);
}
private BottomNavigationView.OnNavigationItemSelectedListener selectedListener =
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.home_bottom_nav:
Home home = new Home();
FragmentTransaction ft1 = getSupportFragmentManager().beginTransaction();
ft1.replace(R.id.framelayout, home, null);
ft1.commit();
return true;
case R.id.menu_bottom_nav:
Menu menu = new Menu();
FragmentTransaction ft2 = getSupportFragmentManager().beginTransaction();
ft2.replace(R.id.framelayout, menu, null);
ft2.commit();
return true;
case R.id.fav_nav_bottom:
Favourites Fav = new Favourites();
FragmentTransaction ft3 = getSupportFragmentManager().beginTransaction();
ft3.replace(R.id.framelayout, Fav, null);
ft3.commit();
return true;
case R.id.user_bottom_profile:
User_Profile Userprofile = new User_Profile();
FragmentTransaction ft4 = getSupportFragmentManager().beginTransaction();
ft4.replace(R.id.framelayout, Userprofile, null);
ft4.commit();
return true;
}
return false;
}
};
}
Please Help Me...

Fragment activity does not appear automatically

I'm working on a project in which I used Bottom Navigation Bar But when I run the application the fragment activity does not appear automatically until I tap on the icon in menu item of bottom navigation bar.
screenshot:
The blank activity appears first when I tap on any fragment activity then it appears.
Here is my code:
BottomNavigation.java
import android.content.DialogInterface;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.FrameLayout;
public class BottomNavigation extends AppCompatActivity {
private BottomNavigationView mMianNav;
private FrameLayout mMainFrame;
private AllResturant allResturant;
private UserProfile userprofile;
private ActivityUser activityUser;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_navigation);
mMainFrame = (FrameLayout) findViewById(R.id.main_frame);
mMianNav = (BottomNavigationView) findViewById(R.id.main_nav);
allResturant = new AllResturant();
userprofile = new UserProfile();
activityUser = new ActivityUser();
//Listener for handling selection events on bottom navigation items
mMianNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.toprofile:
setFragment(userprofile);
return true;
case R.id.tohome:
setFragment(allResturant);
return true;
case R.id.toactivity:
setFragment(activityUser);
return true;
case R.id.tologout:
logout();
return true;
default:
return false;
}
}
private void logout() {
Intent intent = new Intent(BottomNavigation.this, Registration.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
});
}
private void setFragment(Fragment fragment) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.main_frame, fragment);
fragmentTransaction.commit();
}
}
BottomNavigation.xml
<?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=".BottomNavigation">
<android.support.design.widget.BottomNavigationView
android:id="#+id/main_nav"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
app:itemIconTint="#color/nav_items_color"
app:itemTextColor="#color/nav_items_color"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"
app:menu="#menu/nav_items" />
<FrameLayout
android:id="#+id/main_frame"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_above="#+id/main_nav"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
app:layout_constraintBottom_toTopOf="#+id/main_nav"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</FrameLayout>
</android.support.constraint.ConstraintLayout>
How it will appear automatically?

modify your on create as below
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bottom_navigation);
mMainFrame = (FrameLayout) findViewById(R.id.main_frame);
mMianNav = (BottomNavigationView) findViewById(R.id.main_nav);
allResturant = new AllResturant();
userprofile = new UserProfile();
activityUser = new ActivityUser();
setFragment(userprofile);
//Listener for handling selection events on bottom navigation items
mMianNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.toprofile:
setFragment(userprofile);
return true;
case R.id.tohome:
setFragment(allResturant);
return true;
case R.id.toactivity:
setFragment(activityUser);
return true;
case R.id.tologout:
logout();
return true;
default:
return false;
}
}
private void logout() {
Intent intent = new Intent(BottomNavigation.this, Registration.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
});
}

Set first fragment yourself after setting up UI. Add below line at last line of onCreate() method.
setFragment(userprofile);
Cause of fail
Because when your Activity starts then onNavigationItemSelected not called, it will be called when user switch screen.

Your code is almost perfect. The only thing that you didn't do is inflate an Fragment when the Activity is created.
After creating the Activity you need to inflate the Fragment that you want once by using this line:
setFragment(userprofile);
You can put it in your onCreate method after instantiating the fragments. After that, your OnNavigationItemSelectedListener will take care of inflating the fragments.

Android studio, BottomNavigationView

So I have a problem with my application. I select item from BottomNavigationView and he switch activity normally, but have a problem to change item selected why remains to home not to new activity item..
code Java main activity:
package mediaser.tivvmialive;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.TextView;
import android.net.Uri;
import android.widget.MediaController;
import android.widget.VideoView;
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
VideoView videoView =(VideoView)findViewById(R.id.videoView2);
MediaController mediaController= new MediaController(this);
mediaController.setAnchorView(videoView);
Uri uri=Uri.parse("http://rumblehwk.altervista.org/VideoHome/default.mp4");
videoView.setMediaController(mediaController);
videoView.setVideoURI(uri);
videoView.requestFocus();
videoView.start();
}
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
Intent myIntent = new Intent(MainActivity.this, MainActivity.class);
startActivity(myIntent);
break;
case R.id.navigation_dashboard:
Intent myIntent2 = new Intent(MainActivity.this, Archivio.class);
startActivity(myIntent2);
break;
case R.id.navigation_notifications:
break;
}
return true;
}
};
}
And archivio activity is identic cose

You say that the Archivo activity is equal to MainActivity, so what happens is that when you enter the option R.id.navigation_dashboard it opens the Archivo activity that when it is displayed, shows the first BottomNavigation option but the Activity Archivo and not the MainActivity
To achieve that effect you must use a FragmentLayout
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"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<FrameLayout
android:id="#+id/contenido"
android:layout_width="match_parent"
android:layout_marginTop="0dp"
android:layout_height="match_parent"
android:layout_marginBottom="56dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:fitsSystemWindows="true"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:fitsSystemWindows="false"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:elevation="6dp"
android:background="#color/blanco"
android:foreground="?attr/selectableItemBackground"
app:menu="#menu/menu_propietario"/>
</android.support.design.widget.CoordinatorLayout>
And in the MainActivity class
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
Fragment fragment;
FrameLayout frameLayout;
BottomNavigationView bottomNavigationView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bottomNavigationView = (BottomNavigationView) findViewById(R.id.navigation);
frameLayout = (FrameLayout) findViewById(R.id.contenido);
bottomNavigationView.setOnNavigationItemSelectedListener(this);
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment fr = fragment;
switch (item.getItemId()){
case R.id.navigation_home:
pestaña = R.id.inicio;
fragment = InicioFragment.newInstance();
break;
case R.id.navigation_dashboard:
fragment = ArchivoFragment.newInstance();
break;
case R.id.navigation_notifications:
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
if (fr != null){
transaction.remove(fr);
}
if(fragment != null){
transaction.replace(R.id.contenido, fragment);
}
transaction.commit();
return true;
}
}
and your ArchiveFragment class like that
public class ArchiveFragment extends Fragment {
public ArchiveFragment() {
}
public static ArchiveFragment newInstance() {
ArchiveFragmentFragment fragment = new ArchiveFragmentFragment();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_archive, container, false);
return view;
}
}
I hope I've helped

BottomNavigationView resolved thx, but another problem ... "findViewById error cannot resolve method"
Code home (not main activity).
package mediaser.tivvmialive;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.net.Uri;
import android.widget.MediaController;
import android.widget.VideoView;
public class Home extends Fragment {
public static Home newInstance() {
Home fragment = new Home();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
VideoView mVideoView2 = (VideoView)findViewById(R.id.videoView2);
String uriPath2 = "http://rumblehwk.altervista.org/VideoHome/default.mp4";
Uri uri2 = Uri.parse(uriPath2);
mVideoView2.setVideoURI(uri2);
mVideoView2.requestFocus();
mVideoView2.start();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.activity_home, container, false);
}
}

Start new Activity with the navigation drawer still able to be accessed

I created a Navigation drawer using the design support library. When I open the Navigation Drawer and click on the Volunteer menu item see image
I want the contents of the Volunteer screen with three tabs below and still able to access the navigation drawer displayed. I've tried implementing that code but the app crashes
I tried to use this example https://guides.codepath.com/android/Fragment-Navigation-Drawer. However the Activity that has the
I have attached the code for the Main Activity :
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ActionBar ab = getSupportActionBar();
ab.setHomeAsUpIndicator(R.drawable.ic_menu);
ab.setDisplayHomeAsUpEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
if (navigationView != null) {
setupDrawerContent(navigationView);
}
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
selectDrawerItem(menuItem);
return true;
}
});
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the planet to show based on
// position
Fragment fragment = null;
Class fragmentClass;
switch (menuItem.getItemId()) {
case R.id.nav_geotag:
fragmentClass = (Fragment_GeoTag.class);
break;
case R.id.nav_footprint:
fragmentClass = Fragment_Footprint.class;
break;
case R.id.nav_education:
fragmentClass = Fragment_Education.class;
break;
case R.id.nav_rssfeeds:
fragmentClass = SimpleRSSReaderActivity.class;
break;
default:
fragmentClass = HomeActivity.class;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
// Highlight the selected item, update the title, and close the drawer
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mDrawerLayout.closeDrawers();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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.
switch (item.getItemId()) {
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
;
//noinspection SimplifiableIfStatement
// if (id == R.id.action_settings) {
// return true;
// }
return super.onOptionsItemSelected(item);
}
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
}
}
The Volunteer Fragment
import android.app.Activity;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
/**
* Created by s210121629 on 2015-07-01.
*/
public class Fragment_Volunteer extends AppCompatActivity{
private DrawerLayout mDrawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ActionBar ab = getSupportActionBar();
ab.setHomeAsUpIndicator(R.drawable.ic_menu);
ab.setDisplayHomeAsUpEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
if (navigationView != null) {
setupDrawerContent(navigationView);
}
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
if (viewPager != null) {
setupViewPager(viewPager);
}
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Here's a Snackbar", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
private void setupViewPager(ViewPager viewPager) {
Adapter adapter = new Adapter(getSupportFragmentManager());
adapter.addFragment(new PersonalinfoFragment(),"Personal Info");
adapter.addFragment(new MedicalinfoFragment(), "Medical Info");
adapter.addFragment(new ContactinfoFragment(), "Contact Info");
viewPager.setAdapter(adapter);
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
return true;
}
});
}
static class Adapter extends FragmentPagerAdapter {
private final List<Fragment> mFragments = new ArrayList<>();
private final List<String> mFragmentTitles = new ArrayList<>();
public Adapter(FragmentManager fm) {
super(fm);
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitles.add(title);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
}
}
The activity_main layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<!--<include layout="#layout/include_list_viewpager"/>-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="#+id/flContent"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header"
app:menu="#menu/drawer_view" />
</android.support.v4.widget.DrawerLayout>
profile activity layout
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/sin"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fitsSystemWindows="true">
<include layout="#layout/profile_listview_pager"/>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header"
app:menu="#menu/drawer_view"/>
</android.support.v4.widget.DrawerLayout>
Logcat:
Process: com.example.s210121629.eama, PID: 3185
java.lang.NullPointerException
at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:417)
at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:452)
at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:444)
at com.example.s210121629.eama.MainActivity.selectDrawerItem(MainActivity.java:108)
at com.example.s210121629.eama.MainActivity$1.onNavigationItemSelected(MainActivity.java:48)
at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:136)
at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)
at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
at android.support.design.internal.NavigationMenuPresenter.onItemClick(NavigationMenuPresenter.java:179)
at android.widget.AdapterView.performItemClick(AdapterView.java:308)
at android.widget.AbsListView.performItemClick(AbsListView.java:1524)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3531)
at android.widget.AbsListView$3.run(AbsListView.java:4898)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5586)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)

The Volunteer Fragment is not a Fragment as it extends AppCompatActivity. It should extend Fragment.
In the navigation drawer click listener you then should do something like this:
getSupportFragmentManager().beginTransaction().replace(R.id.frame_container, new Fragment_Volunteer()).commit();

you should use only Activity: "MainActivity"
and when you show "Fragment_Volunteer" on item menu put inside switch case:
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.frame_container, new Fragment_Volunteer())
.commit();
use the code next:
Fragment_Volunteer extends Fragment
finally Fragment not use:
protected void onCreate(Bundle savedInstanceState) {}
the code correct is this:
public class Fragment_Volunteer extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_profile, container, false);
return view;
}
}
I hope to help, sorry for my bad english

Fragments get not replaced during OnClick event in navigation drawer

I created a menu with 5 items in a navigation drawer, the 5 items represent 5 different fragments, each time an item gets clicked it should show the related fragment.
Another click on a different item, fragment should be replaced and so on.
I created 5 seperate classes for the fragments.
When i start the app and click an item the very first time, the related fragment gets shown but after i click another item in the menu nothing happens (the fragment gets not replaced), i also get no errors and the app does not crash.
I don`t know where the problem is hopefully somebody can help, here is my code:
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
private Toolbar toolbar;
private MyAdapter myAdapter;
public ListView mainMenuList;
public Fragment_Android fAndroid;
public Fragment_Latest_Releases fLatest;
public Fragment_My_Applications fMyapps;
public Fragment_Platforms fPlatforms;
public Fragment_Settings fSettings;
public android.support.v4.app.FragmentManager fragmanager;
public android.support.v4.app.FragmentTransaction fragtrans;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
mainMenuList = (ListView) findViewById(R.id.testList);
myAdapter = new MyAdapter(this);
mainMenuList.setAdapter(myAdapter);
toolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
NavigationDrawerFragment drawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp((R.id.fragment_navigation_drawer), (DrawerLayout) findViewById(R.id.drawer_layout), toolbar);
fAndroid = new Fragment_Android();
fLatest = new Fragment_Latest_Releases();
fMyapps = new Fragment_My_Applications();
fPlatforms = new Fragment_Platforms();
fSettings = new Fragment_Settings();
mainMenuList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position) {
case 0: {
Toast.makeText(getApplicationContext(), "Android has been clicked.", Toast.LENGTH_SHORT).show();
fragmanager = getSupportFragmentManager();
fragtrans = fragmanager.beginTransaction();
fragtrans.replace(R.id.fragment_container, fAndroid);
fragtrans.commit();
drawer.closeDrawers();
break;
}
case 1: {
Toast.makeText(getApplicationContext(), "Latest Releases has been clicked.", Toast.LENGTH_SHORT).show();
fragmanager = getSupportFragmentManager();
fragtrans = fragmanager.beginTransaction();
fragtrans.replace(R.id.fragment_container, fLatest);
fragtrans.commit();
drawer.closeDrawers();
break;
}
case 2: {
Toast.makeText(getApplicationContext(), "Platforms has been clicked.", Toast.LENGTH_SHORT).show();
fragmanager = getSupportFragmentManager();
fragtrans = fragmanager.beginTransaction();
fragtrans.replace(R.id.fragment_container, fPlatforms);
fragtrans.commit();
drawer.closeDrawers();
break;
}
case 3: {
Toast.makeText(getApplicationContext(), "My Applications has been clicked.", Toast.LENGTH_SHORT).show();
fragmanager = getSupportFragmentManager();
fragtrans = fragmanager.beginTransaction();
fragtrans.replace(R.id.fragment_container, fMyapps);
fragtrans.commit();
drawer.closeDrawers();
break;
}
case 4: {
Toast.makeText(getApplicationContext(), "Settings has been clicked.", Toast.LENGTH_SHORT).show();
fragmanager = getSupportFragmentManager();
fragtrans = fragmanager.beginTransaction();
fragtrans.replace(R.id.fragment_container, fSettings);
fragtrans.commit();
drawer.closeDrawers();
break;
}
}
}
});
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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) {
Toast.makeText(this, "Just hit settings.." + item.getTitle(), Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
}
Example of 1 class (in this case Android):
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment_Android extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View fragandroid = inflater.inflate(R.layout.layout_android, null);
return fragandroid;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
Example of 1 fragment xml (Android fragment):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Android"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
My main activity xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="android.kadas.org.teka.MainActivity">
<include
android:id="#+id/my_toolbar"
layout="#layout/app_bar" />
<android.support.v4.widget.DrawerLayout
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<fragment
android:id="#+id/fragment_navigation_drawer"
android:name="android.kadas.org.teka.NavigationDrawerFragment"
android:layout_width="#dimen/nav_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="#layout/fragment_navigation_drawer"
tools:layout="#layout/fragment_navigation_drawer" />
</android.support.v4.widget.DrawerLayout>
</LinearLayout>

In the click listener you are actually replacing the entire layout of the activity with the desired fragment.
In your main activity's xml add the following layout, inside the RelativeLayout:
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
Change your
fragtrans.replace(R.id.drawer_layout, fragmentX);
statements to
fragtrans.replace(R.id.container, fragmentX);

Finally solved due to the big help of Alexandru Rosianu.
The code has been amended with the correct one.