Develop Reference

This Activity already has an action bar supplied by the window

I have a problem with my Navigation Drawer.
my project First run by splash page and Then show Navigation Drawer.
When I compile my application the following error messages :
AndroidRuntime: FATAL EXCEPTION: main
Process: ir.mosayebtorabi.sapp, PID: 4793
java.lang.RuntimeException: Unable to start activity ComponentInfo{ir.mosayebtorabi.sapp/com.loridic.ir.loridic.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar(AppCompatDelegateImplV9.java:201)
at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:129)
at com.loridic.ir.loridic.MainActivity.onCreate(MainActivity.java:25)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392) 
at android.app.ActivityThread.access$800(ActivityThread.java:153) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5293) 
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:903)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
activity_splash_screen.xml Contains:
<?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"
android:background="#color/colorPrimaryDark"
tools:context="com.loridic.ir.loridic.SplashScreen">
<ImageView
android:id="#+id/image"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="#drawable/lorvajeh"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.4"
android:contentDescription="#string/lorem_ipsum" />
<TextView
android:id="#+id/welcomeText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/welcome_screen"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/image"
app:layout_constraintVertical_bias="0.2"
android:textSize="22sp"
android:textColor="#color/colorWhite"
android:textStyle="bold"/>
activity_splash_screen class Contains:
package com.loridic.ir.loridic;
import android.app.Activity;`
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;
public class SplashScreen extends AppCompatActivity {
Handler handler;
public static Activity fa;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash_screen);
fa = this;
ImageView iv = findViewById(R.id.image);
TextView tv = findViewById(R.id.welcomeText);
Animation animation = AnimationUtils.loadAnimation(this, R.anim.splashtransition);
iv.startAnimation(animation);
tv.startAnimation(animation);
Splashregister();
}
public void Splashregister() {
handler = new Handler();
{
handler.postDelayed(new Runnable() {
#Override
public void run() {
fa.finish();
startActivity(new Intent(SplashScreen.this, MainActivity.class));
}
}, 4000);
}
}
}
styles.xml Contains:
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
</resources>
MainActivity class Contains:
package com.loridic.ir.loridic;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.FrameLayout;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
FrameLayout frameLayout;
FragmentManager fragmentManager=getSupportFragmentManager();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
frameLayout=(FrameLayout)findViewById(R.id.frmlayoutview);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open,
R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#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.
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
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.SentWord) {
FragmentTransaction ft=fragmentManager.beginTransaction();
ft.replace(R.id.frmlayoutview,new FragmentClassAddWord());
ft.commit();
} else if (id == R.id.Target) {
FragmentTransaction ft=fragmentManager.beginTransaction();
ft.replace(R.id.frmlayoutview,new FragmentClassAbout());
ft.commit();
} else if (id == R.id.PersonalInformation) {
FragmentTransaction ft=fragmentManager.beginTransaction();
ft.replace(R.id.frmlayoutview,new FragmentClassRegistername());
ft.commit();
} else if (id == R.id.Share) {
FragmentTransaction ft=fragmentManager.beginTransaction();
ft.replace(R.id.frmlayoutview,new FragmentClassShare());
ft.commit();
} else if (id == R.id.About) {
FragmentTransaction ft=fragmentManager.beginTransaction();
ft.replace(R.id.frmlayoutview,new FragmentClassMaker());
ft.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
MainActivity xml Contains:
<?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"
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>
AndroidManifest.xml Contains:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.loridic.ir.loridic">
<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:label="LoreVajeh"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activityaddword" />
<activity android:name=".Activityregistername" />
<activity android:name=".Activityabout" />
<activity android:name=".Activitymaker" />
<activity android:name=".Activityshareapp" />
<activity android:name=".MainActivity"></activity>
</application>
</manifest>

As you are supplying a toolbar in your MainActivity you need to turn the default one off in the AndroidManifest.xml file
e.g.
<activity
android:name=".MainActivity"
android:theme="#style/AppTheme.NoActionBar" />

common navigation drawer on different activities

I have built an application with an navigation drawer activity in it but now I want it to be present on my other activities as well. I don't want to handle events again and again in different classes.
Also I got suggestions like making one base class and extend that but as I cannot extend more than one class.
Also I also want to use fragments so that I did not have to write the same code again and again
My activity_main.xml is like:
<?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"
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"
android:background="#color/colorPrimary">
<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>
nav_header.xml is like:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="#dimen/nav_header_height"
android:background="#drawable/side_nav_bar"
android:gravity="bottom"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:theme="#style/ThemeOverlay.AppCompat.Dark">
<ImageView
android:id="#+id/imageView"
android:layout_width="72dp"
android:layout_height="72dp"
android:paddingTop="#dimen/nav_header_vertical_spacing"
android:src="#drawable/bcet_logo" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/nav_header_vertical_spacing"
android:text="#string/college_name"
android:textAppearance="#style/TextAppearance.AppCompat.Body1" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/college_name_full" />
</LinearLayout>
MainActivity.java:
package com.bcetapp.bcetbeta;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
Intent intent;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle(null);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#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();
if (id == R.id.nav_student_list) {
// Handle the camera action
} else if (id == R.id.nav_staff_list) {
} else if (id == R.id.nav_help) {
} else if (id == R.id.nav_settings) {
} else if (id == R.id.nav_action_share) {
} else if (id == R.id.nav_contact_us) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
/****************************************************************************************USER DEFINED FUNCTIONS******************************************************************/
public void viewMyProfile(View view){
/*intent = new Intent(this, ProfileActivity.class);
startActivity(intent);*/
}
}
activity_main_drawer.xml:
<?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_student_list"
android:icon="#drawable/ic_group"
android:title="Students" />
<item
android:id="#+id/nav_staff_list"
android:icon="#drawable/ic_action_glasses"
android:title=" College Staff" />
<item
android:id="#+id/nav_help"
android:icon="#drawable/ic_action_help"
android:title="help" />
<item
android:id="#+id/nav_settings"
android:icon="#drawable/ic_menu_manage"
android:title="Settings" />
</group>
<item android:title="More">
<menu>
<item
android:title="About us"
android:id="#+id/nav_about_us"
android:icon="#drawable/ic_action_info"
/>
<item
android:id="#+id/nav_action_share"
android:icon="#drawable/ic_action_share"
android:title="Share App" />
<item
android:id="#+id/nav_contact_us"
android:icon="#drawable/ic_menu_send"
android:title="contact us" />
</menu>
</item>
</menu>

It's not as easy. There are 2 tech-ticks to achieve it. One is to create use fragment second one is to add the whole code in all activities.
To achieve your result in above case, Add the fragment in your activity and replace/add activities as your required

Also i got suggestions like making one base class and extend that but as I cannot extend more than one class.
True, but the thing about class extension is that you can create a base class that extends AppCompatActivity, and then make your activities extend that base class:
public class BaseClass extends AppCompatActivity...
public class MainActivity extends BaseClass...
This will implicitly cause your MainActivity to extend AppCompatActivity.

Error with Navigation Drawer

Hello I am a young Belgian developer and follow currently a tutorial on YouTube to create a Drawer Navigation but I get errors when launching the emulator due.
This is the Tutorial.
Here are the errors :
02-10 11:31:12.432 2297-2297/com.example.flori.mylordring E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.flori.mylordring, PID: 2297
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flori.mylordring/com.example.flori.mylordring.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
at com.example.flori.mylordring.MainActivity.onCreate(MainActivity.java:31)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
And Main code :
package com.example.flori.mylordring;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
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.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageButton;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static ImageButton imgView;
private int test;
int [] images = {R.drawable.im1,R.drawable.im2,R.drawable.im3,R.drawable.im4,R.drawable.im5,R.drawable.im6,R.drawable.im7};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DrawerLayout drawerLayout = (DrawerLayout)findViewById(R.id.drawerLayout);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Rolololo", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
public void image(View view){
imgView=(ImageButton)findViewById(R.id.imageButton);
imgView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
test++;
test = test % images.length;
imgView.setImageResource(images[test]);
}
}
);
}
#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) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Activity code (I have 2 different activities and this is the content_main, i also have activity_main) :
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/drawerLayout"
android:background="#e2656262"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.example.flori.mylordring.MainActivity"
tools:showIn="#layout/activity_main">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragmentholder">
</FrameLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/navlist"
android:background="#dedede"
android:layout_gravity="start"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="#+id/textView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<ImageButton
android:onClick="image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageButton"
android:src="#drawable/im1"
android:background="#android:color/transparent"
android:layout_above="#+id/textView"
android:layout_centerHorizontal="true" />
</android.support.v4.widget.DrawerLayout>
the Manifest code :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.flori.mylordring">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
**</manifest>
and my2 styles.xml :
this is my style.xml :**
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
</resources>
Style.xml(V21) :
<resources>>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
</resources>

In this part of code:
ActionBar actionBar = getSupportActionBar(); //will return null
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);//why set it after you call getSupportActionBar?
As you can see above you are getting the actionbar before set the toolbar as your actionbar, which will return null.
you need to switch those so you will get the reference from your toolbar.

Or in another words, you could use getSupportActionBar():
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); // First initialize the Toolbar
setSupportActionBar(toolbar); // Set as SupportActionBar
getSupportActionBar().setDisplayShowHomeEnabled(true); // do your stuffs
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
And the second problem is:
app:layout_behavior="#string/appbar_scrolling_view_behavior"
Which you set it for Drawer and it shouldn't be there, check this link:
https://github.com/codepath/android_guides/wiki/Handling-Scrolls-with-CoordinatorLayout#expanding-and-collapsing-toolbars
Add an app:layout_behavior to a RecyclerView or any other View capable
of nested scrolling such as NestedScrollView. The support library
contains a special string resource
#string/appbar_scrolling_view_behavior that maps to
AppBarLayout.ScrollingViewBehavior, which is used to notify the
AppBarLayout when scroll events occur on this particular view

Creating a button in Android Toolbar

How can I create a button inside Android's Toolbar that looks like this iOS example?

ToolBar with Button Tutorial
1 - Add library compatibility inside build.gradle
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:21.0.3'
}
2 - Create a file name color.xml to define the Toolbar colors
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="ColorPrimary">#FF5722</color>
<color name="ColorPrimaryDark">#E64A19</color>
</resources>
3 - Modify your style.xml file
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/ColorPrimary</item>
<item name="colorPrimaryDark">#color/ColorPrimaryDark</item>
<!-- Customize your theme here. -->
</style>
</resources>
4 - Create a xml file like tool_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:elevation="4dp" />
5 - Include the Toolbar into your main_activity.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"
tools:context=".MainActivity">
<include
android:id="#+id/tool_bar"
layout="#layout/tool_bar" />
<TextView
android:layout_below="#+id/tool_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/TextDimTop"
android:text="#string/hello_world" />
</RelativeLayout>
6 - Then, put it inside your MainActivity class
package com.example.hp1.materialtoolbar;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;
/* When using AppCompat support library
* (you need to extend Main Activity to
* ActionBarActivity)
* ActionBarActivity has deprecated, use AppCompatActivity
*/
public class MainActivity extends ActionBarActivity {
// Declaring the Toolbar Object
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
// Attaching the layout to the toolbar object
toolbar = (Toolbar) findViewById(R.id.tool_bar);
// Setting toolbar as the ActionBar with setSupportActionBar() call
setSupportActionBar(toolbar);
}
#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) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
7 - And finally, add your "Button Items" to the menu_main.xml inside of /res/menu/ directory
<?xml version="1.0" encoding="utf-8"?>
<menu
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"
tools:context=".MainActivity">
<item
android:id="#+id/action_settings"
android:orderInCategory="100"
android:title="#string/action_settings"
app:showAsAction="never" />
<item
android:id="#+id/action_search"
android:orderInCategory="200"
android:title="Search"
android:icon="#drawable/ic_search"
app:showAsAction="ifRoom"/>
<item
android:id="#+id/action_user"
android:orderInCategory="300"
android:title="User"
android:icon="#drawable/ic_user"
app:showAsAction="ifRoom" />
</menu>

Toolbar customization can done by following ways
write button and textViews code inside toolbar as shown below
<android.support.v7.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<Button
android:layout_width="wrap_content"
android:layout_height="#dimen/btn_height_small"
android:text="Departure"
android:layout_gravity="right"
/>
</android.support.v7.widget.Toolbar>
Other way is to use item menu as shown below
#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;
}

Another possibility is to set the app:actionViewClass attribute in your menu:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/get_item"
android:orderInCategory="1"
android:text="Get"
app:showAsAction="always"
app:actionViewClass="android.support.v7.widget.AppCompatButton"/>
</menu>
In your code you can access this button after the menu was inflated:
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.sample, menu);
MenuItem getItem = menu.findItem(R.id.get_item);
if (getItem != null) {
AppCompatButton button = (AppCompatButton) getItem.getActionView();
//Set a ClickListener, the text,
//the background color or something like that
}
return super.onCreateOptionsMenu(menu);
}

I have added text in ToolBar :
menu_skip.xml
<menu 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"
tools:context=".MainActivity">
<item
android:id="#+id/action_settings"
android:title="#string/text_skip"
app:showAsAction="never" />
</menu>
MainActivity.java
#Override
boolean onCreateOptionsMenu(Menu menu) {
inflater = getMenuInflater();
inflater.inflate(R.menu.menu_otp_skip, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// action with ID action_refresh was selected
case R.id.menu_item_skip:
Toast.makeText(this, "Skip selected", Toast.LENGTH_SHORT)
.show();
break;
default:
break;
}
return true;
}

They are called menu items or action buttons in toolbar/actionbar. Here you have Google tutorial how it works and how to add them
https://developer.android.com/training/basics/actionbar/adding-buttons.html

You can actually put anything inside a toolbar. See the below code.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:background="#color/colorPrimary">
</android.support.v7.widget.Toolbar>
Between the above toolbar tag you can put almost anything. That is the benefit of using a Toolbar.
Source: Android Toolbar Example

You could use actionLayout from the support library.
menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/button_item"
android:title=""
app:actionLayout="#layout/button_layout"
app:showAsAction="always"
/>
</menu>
button_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
</RelativeLayout>
Activity.java
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
MenuItem item = menu.findItem(R.id.button_item);
Button btn = item.getActionView().findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(MainActivity.this, "Toolbar Button Clicked!", Toast.LENGTH_SHORT).show();
}
});
return true;
}

I was able to achieve that by wrapping Button with ConstraintLayout:
<androidx.coordinatorlayout.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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp">
<androidx.appcompat.widget.Toolbar
android:id="#+id/top_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/white_color">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_marginTop="10dp"
android:layout_height="wrap_content">
<TextView
android:id="#+id/cancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/cancel"
android:layout_marginStart="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/btn_publish"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/publish"
android:background="#drawable/button_publish_rounded"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="10dp"
app:layout_constraintLeft_toRightOf="#id/cancel"
tools:layout_editor_absoluteY="0dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
You may create a drawable resourcebutton_publish_rounded, define the button properties and assign this file to button's android:background property:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#color/green" />
<corners android:radius="100dp" />
</shape>

Android Design Support Library Secondary Drawer Menu

I've switched to the official Google Design Support Library. Now, I want to use a secondary menu with a divider like this:
But as Android is using the Menu Inflater I have no idea what to do now. I can add a second group, but then the items have the same size and there is no divider.
drawer.xml:
<?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/overview"
android:checked="true"
android:icon="#drawable/ic_action_dashboard"
android:title="#string/drawer_overview" />
<item
android:id="#+id/social_evening"
android:checked="false"
android:icon="#drawable/ic_action_brightness_3"
android:title="#string/drawer_social_evening" />
<item
android:id="#+id/scouting_games"
android:checked="false"
android:icon="#drawable/ic_action_landscape"
android:title="#string/drawer_scouting_games" />
<item
android:id="#+id/olympics"
android:checked="false"
android:icon="#drawable/ic_action_stars"
android:title="#string/drawer_olympics" />
<item
android:id="#+id/quizzes"
android:checked="false"
android:icon="#drawable/ic_action_school"
android:title="#string/drawer_quizzes" />
</group>
</menu>
MainActivity.java:
package net.sutomaji.freizeitspiele;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
/**
* Created by Tom Schneider on 18.06.15
*/
public class MainActivity extends AppCompatActivity {
//Defining Variables
private Toolbar toolbar;
private NavigationView navigationView;
private DrawerLayout drawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing Toolbar and setting it as the actionbar
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Initializing NavigationView
navigationView = (NavigationView) findViewById(R.id.navigation_view);
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);Q
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()){
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.overview:
Toast.makeText(getApplicationContext(), "Overview Selected", Toast.LENGTH_SHORT).show();
ContentFragment fragment = new ContentFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame,fragment);
fragmentTransaction.commit();
return true;
// For rest of the options we just show a toast on click
case R.id.social_evening:
Toast.makeText(getApplicationContext(),"SE Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.scouting_games:
Toast.makeText(getApplicationContext(),"SG Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.olympics:
Toast.makeText(getApplicationContext(),"OL Selected",Toast.LENGTH_SHORT).show();
return true;
case R.id.quizzes:
Toast.makeText(getApplicationContext(),"QZ Selected",Toast.LENGTH_SHORT).show();
return true;
default:
Toast.makeText(getApplicationContext(),"Somethings Wrong",Toast.LENGTH_SHORT).show();
return true;
}
}
});
// Initializing Drawer Layout and ActionBarToggle
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.openDrawer, R.string.closeDrawer){
#Override
public void onDrawerClosed(View drawerView) {
// Code here will be triggered once the drawer closes as we dont want anything to happen so we leave this blank
super.onDrawerClosed(drawerView);
}
#Override
public void onDrawerOpened(View drawerView) {
// Code here will be triggered once the drawer open as we dont want anything to happen so we leave this blank
super.onDrawerOpened(drawerView);
}
};
//Setting the actionbarToggle to drawer layout
drawerLayout.setDrawerListener(actionBarDrawerToggle);
//calling sync state is necessay or else your hamburger icon wont show up
actionBarDrawerToggle.syncState();
}
#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) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
So, how can I create a menu like this, or how can I add dividers (with category headers) to my navigation drawer?

You can use the standard NavigationView defining a menu like this:
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:id="#+id/group1" android:checkableBehavior="single" id>
//items of group1
</group>
<group android:id="#+id/group2" android:checkableBehavior="single" id>
//items of group2
</group>
It is important to give an unique id to each group.

Tutorial: Navigation View Design Support Library
Menu Items:
<?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/navigation_item_attachment"
android:checked="true"
android:icon="#drawable/ic_attachment"
android:title="#string/nav_item_attachment" />
<item
android:id="#+id/navigation_item_images"
android:icon="#drawable/ic_image"
android:title="#string/nav_item_images" />
<item
android:id="#+id/navigation_item_location"
android:icon="#drawable/ic_place"
android:title="#string/nav_item_location" />
</group>
<item android:title="#string/nav_sub_menu">
<menu>
<item
android:icon="#drawable/ic_emoticon"
android:title="#string/nav_sub_menu_item01" />
<item
android:icon="#drawable/ic_emoticon"
android:title="#string/nav_sub_menu_item02" />
</menu>
</item>
</menu>

Here is what you exactly looking for:
<?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/Home"
android:checked="false"
android:icon="#drawable/ic_home"
android:title="#string/homestr" />
<item
android:id="#+id/myacc"
android:checked="false"
android:icon="#drawable/ic_account"
android:title="#string/myaccstr" />
<item
android:id="#+id/popular"
android:checked="false"
android:icon="#drawable/ic_star"
android:title="#string/Popularstr" />
<item
android:id="#+id/newsit"
android:checked="false"
android:icon="#drawable/ic_news"
android:title="#string/newsstr" />
<item android:title="#string/gn">
<menu>
<item
android:id="#+id/settings"
android:checked="false"
android:icon="#drawable/ic_setting"
android:title="#string/action_settings" />
<item
android:id="#+id/help"
android:checked="false"
android:icon="#drawable/ic_help"
android:title="#string/helpstr" />
</menu>
</item>
</group>
</menu>

You can use any ViewGroup like a LinearLayout for your Drawer. It is not limited to a ListView and a FrameLayout. Because of this you can style your Drawer View like any other layout of an Activity for example. The only thing you should keep in mind is that the NavigationDrawer can have only two childs. The first is your layout for the Activity and the second is the Drawer. Feel free to style them as you like!
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- YOUR DRAWER -->
<LinearLayout
android:id="#+id/drawer_view"
android:layout_width="240dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_gravity="start">
<!-- Use any Views you like -->
<ListView
android:id="#+id/left_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp"
android:background="#ffffff"/>
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
for the divider
android:divider="#FFFFFF"
android:dividerHeight="1dp"