Develop Reference

How do I get my app to run with navigation view?

I am trying to add a navigational menu to my app and I am following the Create a navigation drawer at https://developer.android.com/training/implementing-navigation/nav-drawer
When i try to run the app I get as far as seeing a blank white screen than the app closes.
I don't have any errors in my code or when it gets compiled, it just wont load the main page.
package com.example.troubleshootonly.americanharvest
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import com.example.troubleshootonly.americanharvest.R.layout.activity_main
var pass: String = ""
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(activity_main)
//these create buttons with buttF being the name of the button
//everything in brackets is the function, which starts activity
/*
buttF.setOnClickListener {
startActivity(Intent(this, Activity2::class.java))
}
buttE.setOnClickListener {
startActivity(Intent(this, Activity3::class.java))
}
buttC.setOnClickListener {
startActivity(Intent(this, Activity4::class.java))
}
*/
/* admin stuff
admin.setOnClickListener {
val tempPw = adminPass.text.trim().toString()
if (tempPw.equals(pass, true)) {
startActivity(Intent(this, adminPage::class.java))
} else {
startActivity(Intent(this, MainActivity::class.java))
}
}
*/
}
}
this is my main activity page
xmlns:tools="http://schemas.android.com/tools" android:id="#+id/mainPage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fitsSystemWindows="true" tools:openDrawer="start"
android:visibility="visible">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/ahlogo" android:visibility="visible"/>
<android.support.design.widget.NavigationView
android:layout_width="wrap_content"
android:layout_gravity="start"
android:layout_height="wrap_content" android:id="#+id/menuMain"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginEnd="44dp" android:layout_marginRight="44dp"
app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintVertical_bias="0.0"
app:menu="#menu/drawer_view" android:fitsSystemWindows="false">
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
logcat:
--------- beginning of crash
2019-01-12 20:20:45.486 13641-13641/com.example.troubleshootonly.americanharvest E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.troubleshootonly.americanharvest, PID: 13641
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.troubleshootonly.americanharvest/com.example.troubleshootonly.americanharvest.MainActivity}: android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class android.support.design.widget.NavigationView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class android.support.design.widget.NavigationView
Caused by: android.view.InflateException: Binary XML file line #16: Error inflating class android.support.design.widget.NavigationView
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:647)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.troubleshootonly.americanharvest.MainActivity.onCreate(MainActivity.kt:13)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f0c0000
at android.content.res.ResourcesImpl.getValue(ResourcesImpl.java:216)
at android.content.res.Resources.loadXmlResourceParser(Resources.java:2155)
at android.content.res.Resources.getLayout(Resources.java:1155)
2019-01-12 20:20:45.487 13641-13641/com.example.troubleshootonly.americanharvest E/AndroidRuntime: at android.support.v7.view.SupportMenuInflater.inflate(SupportMenuInflater.java:125)
at android.support.design.widget.NavigationView.inflateMenu(NavigationView.java:264)
at android.support.design.widget.NavigationView.<init>(NavigationView.java:189)
at android.support.design.widget.NavigationView.<init>(NavigationView.java:104)
... 28 more
--------- beginning of system

The code is unclear and also some line of code is missing. Like i cant see the start of Drawer layout.
Also you have not Declared the Drawer Layout and NavigationView in your MainActivity.java, As you have not provided code clearly. Hence I have provided you the main files needed to implement navigation drawer. Just copy paste as it is (expect package name :p).
MainActivity.java (I named it navBar.java)
public class navBar extends AppCompatActivity {
private DrawerLayout drawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nav_bar);
drawerLayout = findViewById(R.id.drawer_layout_tab_bar);
NavigationView navigationView = findViewById(R.id.navigation_view_tab_bar_activity);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
// set item as selected to persist highlight
menuItem.setChecked(true);
// close drawer when item is tapped
drawerLayout.closeDrawers();
// Add code here to update the UI based on the item selected
// For example, swap UI fragments here
return true;
}
});
}
}
activity_main.xml (I named it activity_nav_bar)
public class navBar extends AppCompatActivity {
private DrawerLayout drawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nav_bar);
drawerLayout = findViewById(R.id.drawer_layout_tab_bar);
NavigationView navigationView = findViewById(R.id.navigation_view_tab_bar_activity);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
// set item as selected to persist highlight
menuItem.setChecked(true);
// close drawer when item is tapped
drawerLayout.closeDrawers();
// Add code here to update the UI based on the item selected
// For example, swap UI fragments here
return true;
}
});
}
}
Add these to your app gradle file (If not present)
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
Use this as menu file to show content in nav_bar.
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<group android:checkableBehavior="single">
<item
android:id="#+id/nav_profile"
android:icon="#drawable/ic_baseline_account_circle_24px"
android:title="#string/profile" />
<item
android:id="#+id/nav_templates"
android:icon="#drawable/ic_baseline_create_24px"
android:title="#string/temp" />
<item
android:id="#+id/nav_logout"
android:icon="#drawable/ic_baseline_exit_to_app_24px"
android:title="#string/log_out" />
</group>
</menu>
Hope this helps.

BottomNavigationView working fine in emulator but crashes app in real mobile

I am implementing BottomNavigationView in my app. It works fine in emulator but crashes app when i tried in real mobile. I am also using viewpager in main activity for swipe bottomnavigation items. I check with gradle dependency also but still its crashes. And android version of both the emulator and mobile is same.
Main Activity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, Dashboard.OnFragmentInteractionListener, Profile.OnFragmentInteractionListener, Plans.OnFragmentInteractionListener, Test.OnFragmentInteractionListener {
private ViewPager vp_pages;
MenuItem prevMenuItem;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
// android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
// android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
switch (item.getItemId()) {
case R.id.navigation_dashboard:
// fragmentTransaction.replace(R.id.container, new Dashboard()).commit();
vp_pages.setCurrentItem(0);
return true;
case R.id.navigation_profile:
// fragmentTransaction.replace(R.id.container, new Profile()).commit();
vp_pages.setCurrentItem(1);
return true;
case R.id.navigation_test:
// fragmentTransaction.replace(R.id.container, new Test()).commit();
vp_pages.setCurrentItem(2);
return true;
case R.id.navigation_plans:
// fragmentTransaction.replace(R.id.container, new Plans()).commit();
vp_pages.setCurrentItem(3);
return true;
}
return false;
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
final BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
BottomNavigationViewHelper.removeShiftMode(navigation);
// android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
// android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
// fragmentTransaction.replace(R.id.container, new Dashboard()).commit();
vp_pages = (ViewPager) findViewById(R.id.vp_pages);
vp_pages.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (prevMenuItem != null) {
prevMenuItem.setChecked(false);
} else {
navigation.getMenu().getItem(0).setChecked(false);
}
navigation.getMenu().getItem(position).setChecked(true);
prevMenuItem = navigation.getMenu().getItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
setupViewPager(vp_pages);
}
#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.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_logout) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_rateus) {
// Handle the camera action
} else if (id == R.id.nav_feedback) {
} else if (id == R.id.nav_contactus) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_logout) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onFragmentInteraction(Uri uri) {
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
Dashboard dashboard= new Dashboard();
Profile profile = new Profile();
Test test = new Test();
Plans plans = new Plans();
viewPagerAdapter.addFragment(dashboard);
viewPagerAdapter.addFragment(profile);
viewPagerAdapter.addFragment(test);
viewPagerAdapter.addFragment(plans);
viewPager.setAdapter(viewPagerAdapter);
}
}
activity_main.xml
<android.support.v4.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:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<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_main"
app:menu="#menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
app_bar_main.xml
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.smiles.elearning.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main" />
</android.support.design.widget.CoordinatorLayout>
content_main.xml
<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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.smiles.elearning.MainActivity"
tools:showIn="#layout/app_bar_main">
<FrameLayout
android:id="#+id/container"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation" />
<android.support.v4.view.ViewPager
android:id="#+id/vp_pages"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</android.support.constraint.ConstraintLayout>
dependency
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:27.0.2'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:support-v4:27.0.2'
implementation 'com.android.support:support-vector-drawable:27.0.2'
implementation 'com.android.support:recyclerview-v7:27.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
implementation 'com.android.support:design:27.0.2'
implementation 'com.android.support:support-v13:27.0.2'
compile 'com.github.lzyzsd:circleprogress:1.2.1'
compile 'dev.dworks.libs:volleyplus:+'
implementation files('libs/YouTubeAndroidPlayerApi.jar')
}
Menifest
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".SplashScreen"
android:theme="#style/Theme.Design.Light.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Login"
android:theme="#style/Theme.Design.Light.NoActionBar" />
<activity
android:name=".Register"
android:theme="#style/Theme.Design.Light.NoActionBar" />
<activity
android:name=".OTP"
android:theme="#style/Theme.Design.Light.NoActionBar" />
<activity
android:name=".SelectStandard"
android:theme="#style/Theme.Design.Light.NoActionBar" />
<activity android:name=".Course" />
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main"
android:theme="#style/AppTheme.NoActionBar" />
<activity android:name=".RegisterDetail" />
<activity android:name=".Topics" />
<activity android:name=".StudyMaterial" />
<activity android:name=".Video"></activity>
</application>
Logcat
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.smiles.elearning, PID: 11772
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.smiles.elearning/com.smiles.elearning.MainActivity}: android.view.InflateException: Binary XML file line #0: Error inflating class android.support.design.widget.BottomNavigationView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2693)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class android.support.design.widget.BottomNavigationView
at android.view.LayoutInflater.createView(LayoutInflater.java:640)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:750)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:933)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:933)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:511)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at android.view.LayoutInflater.inflate(LayoutInflater.java:366)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.smiles.elearning.MainActivity.onCreate(MainActivity.java:64)
at android.app.Activity.performCreate(Activity.java:6289)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758) 
at android.app.ActivityThread.access$900(ActivityThread.java:177) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:5942) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195) 
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
at android.view.LayoutInflater.createView(LayoutInflater.java:614)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:750) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:933) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:933) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:511) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:415) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:366) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
at com.smiles.elearning.MainActivity.onCreate(MainActivity.java:64) 
at android.app.Activity.performCreate(Activity.java:6289) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758) 
at android.app.ActivityThread.access$900(ActivityThread.java:177) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:5942) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195) 
Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f070083
at android.content.res.Resources.getValue(Resources.java:2345)
at android.support.v7.widget.AppCompatDrawableManager.loadDrawableFromDelegates(AppCompatDrawableManager.java:328)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:193)
at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:186)
at android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100)
at android.support.v7.view.menu.MenuItemImpl.getIcon(MenuItemImpl.java:491)
at android.support.design.internal.BottomNavigationItemView.initialize(BottomNavigationItemView.java:100)
at android.support.design.internal.BottomNavigationMenuView.buildMenuView(BottomNavigationMenuView.java:281)
at android.support.design.internal.BottomNavigationPresenter.updateMenuView(BottomNavigationPresenter.java:62)
at android.support.design.widget.BottomNavigationView.inflateMenu(BottomNavigationView.java:236)
at android.support.design.widget.BottomNavigationView.<init>(BottomNavigationView.java:165)
at android.support.design.widget.BottomNavigationView.<init>(BottomNavigationView.java:114)
at java.lang.reflect.Constructor.newInstance(Native Method) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:288) 
at android.view.LayoutInflater.createView(LayoutInflater.java:614) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:750) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:933) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:933) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:511) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:415) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:366) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
at com.smiles.elearning.MainActivity.onCreate(MainActivity.java:64) 
at android.app.Activity.performCreate(Activity.java:6289) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758) 
at android.app.ActivityThread.access$900(ActivityThread.java:177) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:5942) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195) 

Check your app build.gradle file and make sure that appcompat and design library version is the same, it can crash if the version is different
compile 'com.android.support:appcompat-v7:23.1.1' // appcompat library
compile 'com.android.support:design:23.1.1' //design support library

The only thing I see that is possibly not correct is your closing bracket (/>) for
<android.support.design.widget.BottomNavigationView.
In some text editors (atom for example) it needs to alligned with the opening bracket. This is also exactly where your error is so it's a solid idea to give that a try.
Or, at the bottom close it out by writing it out completely. </android.support.design.widget.BottomNavigationView> for example.

Error inflating class fragment, cannot start the activity, My app starts and stops abruptly

I am new to android, I have been following the lessons by edx. But when I tried to run the code, I am getting the stack trace as,
12 11:47:44.436 2965-2965/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.lambda.momaer, PID: 2965
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lambda.momaer/com.example.lambda.momaer.MainActivity}: android.view.InflateException: Binary XML file line #11: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2660)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2730)
at android.app.ActivityThread.access$800(ActivityThread.java:185)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5847)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
Caused by: android.view.InflateException: Binary XML file line #11: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:769)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:812)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:923)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:808)
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:923)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:808)
at android.view.LayoutInflater.inflate(LayoutInflater.java:510)
at android.view.LayoutInflater.inflate(LayoutInflater.java:420)
at android.view.LayoutInflater.inflate(LayoutInflater.java:371)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.deepakchethan.moviemanager.MainActivity.onCreate(MainActivity.java:25)
at android.app.Activity.performCreate(Activity.java:6117)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2613)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2730) 
at android.app.ActivityThread.access$800(ActivityThread.java:185) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:194) 
at android.app.ActivityThread.main(ActivityThread.java:5847) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
Caused by: java.lang.NullPointerException
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.support.v4.app.Fragment.isSupportFragmentClass(Fragment.java:464)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3404)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:378)
at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:33)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:79)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:739)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:812) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:923) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:808) 
at android.view.LayoutInflater.parseInclude(LayoutInflater.java:923) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:808) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:510) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:420) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:371) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
at com.example.deepakchethan.moviemanager.MainActivity.onCreate(MainActivity.java:25) 
at android.app.Activity.performCreate(Activity.java:6117) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2613) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2730) 
at android.app.ActivityThread.access$800(ActivityThread.java:185) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567) 
at android.os.Handler.dispatchMessage(Handler.java:111) 
at android.os.Looper.loop(Looper.java:194) 
at android.app.ActivityThread.main(ActivityThread.java:5847) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
And the Main activity looks like,
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
#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.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) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
Class frag;
if (id == R.id.nav_upComing) {
frag=upComingFragment.class;
showFragment(frag);
} else if (id == R.id.nav_nowPlaying) {
frag=nowPlayingFragment.class;
showFragment(frag);
} else if (id == R.id.nav_close) {
finish();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private void showFragment(Class frag) {
Fragment fragment=null;
try {
fragment= (Fragment) frag.newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
FragmentManager fm=getSupportFragmentManager();
fm.beginTransaction().replace(R.id.flip,fragment,null).commit();
}
}
My xml files looks like this,
<?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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.deepakchethan.moviemanager.MainActivity"
tools:showIn="#layout/app_bar_main">
<fragment
android:id="#+id/flip"
android:layout_width="match_parent"
android:layout_height="match_parent"></fragment>
</android.support.constraint.ConstraintLayout>
I searched and found no solution on stackoverflow. I just thought i will ask myself. Please help me.

This question has already been answered several times, you cannot change a statically created fragment. So change the tag from fragment to FrameLayout in your xml file. It should work fine.
<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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.deepakchethan.moviemanager.MainActivity"
tools:showIn="#layout/app_bar_main">
<FrameLayout
android:id="#+id/flip"
android:layout_width="match_parent"
android:layout_height="match_parent"></FrameLayout>
</android.support.constraint.ConstraintLayout>

Fragments in AppCompatActivity

Could I use this extension if I want to use Fragments in my swipe view activity?
public class Overview_Screen extends AppCompatActivity {
My Fragment classes use this one:
public class MessagesFragmentPortrait extends android.support.v4.app.Fragment {
I am asking this because my app keeps crashing...
Here is my main Activity:
public class Overview_Screen extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_overview_screen);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_overview_screen, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
Intent settings_intent = new Intent(this, Settings_Screen.class);
startActivity(settings_intent);
return true;
}
return super.onOptionsItemSelected(item);
}
public static class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
switch (i) {
case 0:
return new AccountFragmentPortrait();
case 1:
return new FeedFragmentPortrait();
default:
return new MessagesFragmentPortrait();
}
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Account";
case 1:
return "Feed";
case 2:
return "Messages";
}
return null;
}
}
}
and here is my stack trace:
FATAL EXCEPTION: main
Process: de.lukas_schroederoutlook.connect, PID: 3364
java.lang.RuntimeException: Unable to start activity ComponentInfo{de.lukas_schroederoutlook.connect/de.lukas_schroederoutlook.connect.Overview_Screen}:
android.view.InflateException: Binary XML file line #41: Binary XML file line #41: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.view.InflateException: Binary XML file line #41: Binary XML file line #41: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #41: Error inflating class fragment
Caused by: java.lang.NullPointerException
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:742)
at java.lang.ClassLoader.loadClass(ClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.support.v4.app.Fragment.isSupportFragmentClass(Fragment.java:469)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2384)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:378)
at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:33)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:77)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:777)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143)
at de.lukas_schroederoutlook.connect.Overview_Screen.onCreate(Overview_Screen.java:42)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
And lastly, here is my overview screen xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="de.lukas_schroederoutlook.connect.Overview_Screen">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/feed_fragment_portrait"/>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/feed_fragment_landscape"/>
And my overview screen fragment 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: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="de.lukas_schroederoutlook.connect.Overview_Screen$PlaceholderFragment">
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

You need to specify a class attribute in your <fragment> tags.
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/feed_fragment_portrait"/>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/feed_fragment_landscape"/>
Add a class="your.packagename.SomeFragment" on both of those (if you actually need both... Typically you have different layout files for landspace and portrait, not have both in one)
It looks like you are using a ViewPager, though, so do you really need the <fragment> tags at all? I think you can remove them.

You need something like this:
<fragment
android:name="de.lukas_schroederoutlook.connect.FeedFragmentPortrait"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/feed_fragment_portrait"/>
Or use
class=
as cricket said.

Android Hide ActionBar while scrolling in a ListView

I am looking for a method to hide actionbar like GooglePlay, when scrolling down and let the ActionBar reappear when scrolling up. I have found a lot of guides but them are about recyclerview and I am using listview.
The best guide I found is this: https://mzgreen.github.io/2015/06/23/How-to-hideshow-Toolbar-when-list-is-scrolling%28part3%29/.
This is my layout:
<?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/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/FList" />
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.design.widget.CoordinatorLayout>
This is my error:
Process: com.mycompany.test, PID: 6172
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mycompany.test/com.mycompany.test.activities.Friends_List_Activity}: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.design.widget.CoordinatorLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2329)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
at android.app.ActivityThread.access$900(ActivityThread.java:147)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:117)
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.design.widget.CoordinatorLayout
at android.view.LayoutInflater.createView(LayoutInflater.java:633)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:684)
at android.view.LayoutInflater.inflate(Unknown Source)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:428)
at android.app.Activity.setContentView(Activity.java:2144)
at com.mycompany.test.activities.Friends_List_Activity.onCreate(Friends_List_Activity.java:26)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2282)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
            at android.app.ActivityThread.access$900(ActivityThread.java:147)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
            at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:117)
EDIT:
Hiding the ActionBar on RecyclerView/ListView onScroll
In the guide above I can't use the code, I need to extend Activity so I am unable to use getSupportActionBar()
EDIT 2.0:
My activity:
public class Contacts_List_Activity extends Activity {
private SearchView mSearchView;
private Contacts_List_Adapter_OBJ ContactsAdapter;
private Menu menu;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_Contacts_list);
ContactsAdapter = new Contacts_List_Adapter_OBJ(this);
final ListView listView = (ListView) findViewById(R.id.Contacts);
listView.setAdapter(ContactsAdapter);
}
#Override
public boolean onCreateOptionsMenu(final Menu menu) {
this.menu = menu;
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_Contact_list_screen, menu);
mSearchView = (SearchView) menu.findItem(R.id.search).getActionView();
mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String s) {
return false;
}
#Override
public boolean onQueryTextChange(String s) {
Contacts_List_Adapter_OBJ FilterAdapter = ContactsAdapter;
if (TextUtils.isEmpty(s)) {
FilterAdapter.getFilter().filter("");
} else {
FilterAdapter.getFilter().filter(s.toLowerCase());
}
return true;
}
});
mSearchView.setOnSearchClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Set_MenuItem_Visible(false);
}
});
mSearchView.setOnCloseListener(new SearchView.OnCloseListener() {
#Override
public boolean onClose() {
Set_MenuItem_Visible(true);
return false;
}
});
final MenuItem searchMI = menu.findItem(R.id.search);
mSearchView.setOnQueryTextFocusChangeListener(new View.OnFocusChangeListener() {
#Override
public void onFocusChange(View view, boolean queryTextFocused) {
if (!queryTextFocused) {
searchMI.collapseActionView();
}
}
});
return true;
}
}

This is what I tried with the xml layout and it works :
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
The issue in your case seems to be the base Activity. Extend your Contacts_List_Activity with AppCompatActivity
Updated layout - adding app:layout_scrollFlags="scroll|enterAlways" to toolbar and
app:layout_behavior="#string/appbar_scrolling_view_behavior" to listview
<?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/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/FList" />
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
app:layout_scrollFlags="scroll|enterAlways"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.design.widget.CoordinatorLayout>