How to dynamically change ToolbarResource

How to dynamically change ToolbarResource - android

I'm developing PCL aplication in Xamarin.Forms.
I want to have a customized toolbar for my main page (with custom layout, logo etc.) and standard toolbars for all other pages (with back button and some ContentPage.ToolbarItems).
I created custom file MainToolbar.axml in layouts folder and wrote
ToolbarResource = Resource.Layout.MainToolbar;
in OnCreate event handler in MainActivity.cs.
Now I can see my custom toolbar not only on main page but on all pages. I try to write ToolbarResource = Resource.Layout.Toolbar; in OnDisappearing event handler of the main page, but it doesn't affect. So how can I change the toolbar back to standard? I don't have android renderers for all pages and I think there is must be a better way. Thanks.

The basic answer you cannot change the whole toolbar but you can develop 2 layouts: main and not main and programatically set their visibility in a single toolbar widget or add/remove them from the toolbar. I would do it this way. In PCL in your main page
protected override void OnDisappearing()
{
base.OnDisappearing();
MessagingCenter.Send<Page, string>(this, "toolbar", "notmain");
}
protected override void OnAppearing()
{
base.OnAppearing();
MessagingCenter.Send<Page, string>(this, "toolbar", "main");
}
In your MainActivity after you initialize Forms
protected override void OnCreate(Bundle bundle)
{
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
var mainToolbarLayout = FindViewById<LinearLayout>(Resource.Id.toolbarMainLayout);
MessagingCenter.Subscribe<Page, string>(this, "toolbar", (page, toolbar) =>
{
if (toolbar == "main")
{
mainToolbarLayout.Visibility = ViewStates.Visible;
}
else
{
mainToolbarLayout.Visibility = ViewStates.Gone;
}
});
}
Here is a sample of Toolbar
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:contentInsetEnd="0dp"
app:contentInsetLeft="0dp"
app:contentInsetRight="0dp"
app:contentInsetStart="0dp"
android:clipToPadding="false"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/toolbarMainLayout"
android:background="#android:color/holo_green_light" />
</android.support.v7.widget.Toolbar>

Related

Call navigation icon click in toolbar (android)

I have code below:
setSupportActionBar(toolbar);
toolbar.setNavigationOnClickListener(onClickListener);
and XML:
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:paddingStart="0dp"
android:paddingEnd="12dp"
app:contentInsetStart="0dp"
app:navigationIcon="#drawable/ic_menu_black_24dp"
app:title="#string/app_name" />
</com.google.android.material.appbar.AppBarLayout>
I want to call click on navigation icon of toolbar, but i cant find method to do it.
I can't call onClickListener(null) because I change icon inside onClick.

Please try this by replacing 'number' with the index of the icon. (It could be 1-2-3-4 etc.)
toolbar.getChildAt(number).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//do whatever you want here
}
});

Try this,
Toolbar toolbar;
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}

You can used setNavigationOnClickListener {} for this.
// I used private function here, you don't need to.
private fun onBackArrowPressed() {
// when user clicked the navigation icon (here is back arrow)
binding.toolbar.setNavigationOnClickListener {
// find the nav controller and pop backstack
findNavController().popBackStack()
}
}
Material Components Android Top AppBar

Toolbar does not show up in Xamarin.Android

I'm trying to replace an ActionBar with a toolbar, but the toolbar doesn't show up. I don't understand why my page is still blank without the toolbar, what am I missing?
My style:
<style name="MyThemeActionBar" parent="Theme.AppCompat.Light">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
My toolbar.axml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:layout_width="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/toolbartitile"
android:text="Kodej"/>
</android.support.v7.widget.Toolbar>
My activity:
[Activity(Label = "MainLoginActivity" , Theme = "#style/MyThemeActionBar")]
public class MainLoginActivity : AppCompatActivity
{
private ISharedPreferences sp;
private Android.Support.V7.Widget.Toolbar toolbar;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.MainLogin);
toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
SetSupportActionBar(toolbar);
sp = GetSharedPreferences(null, FileCreationMode.Private);
TextView tv = FindViewById<TextView>(Resource.Id.emailMain);
tv.Text = sp.GetString("email", null);
tv.Click += (object sender, EventArgs e) =>
{
Android.Support.V7.App.AlertDialog.Builder ad = new Android.Support.V7.App.AlertDialog.Builder(this);
ad.SetTitle("Logout");
ad.SetMessage("Are you sure you want to logout");
ad.SetPositiveButton("Yes", (senderAlert, args) =>
{
ISharedPreferencesEditor editor = sp.Edit();
editor.Remove("email");
editor.Apply();
StartActivity(typeof(MainActivity));
Finish();
});
ad.SetNegativeButton("Cancel", (senderAlert, args) => {});
Dialog dialog = ad.Create();
dialog.Show();
};
}
}

I think the problem could be with the code:
toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
Since you didn't post your code of your MainLogin layout, when you code this in your MainLoginActivity, the context is MainLoginActivity, and you should make sure there is a Android.Support.V7.Widget.Toolbar which ID is toolbar existing in the MainLogin layout, otherwise, this will return a null, and it won't throw an exception when you SetSupportActionBar(toolbar);.
To solve this issue, you can:
Move your layout for your Toolbar into MainLogin layout.
Or keep your Toolbar in your toolbar layout but use it in your MainLogin layout for example like this:
MainLogin layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include android:id="#+id/toolbar"
layout="#layout/mytoolbar" />
</LinearLayout>

How to hide Android tabs using Xamarin Forms custom renderer?

In Xamarin Forms, I need to write a custom TabbedPageRenderer to hide the Android tabbar. However, I don't know how to do this.
[assembly: ExportRenderer(typeof(CTabbedPage), typeof(CTabbedPageRenderer))]
namespace App15.Droid
{
public class CTabbedPageRenderer : TabbedPageRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<TabbedPage> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
(this.Context as Activity).ActionBar.NavigationMode = ActionBarNavigationMode.Standard;
}
}
}
}
This code throws an exception because ActionBar is set to null. I'm using AppCompat 23.3.0 and XF 2.3.2.118-pre1.
EDIT: I'm thinking the reason ActionBar is null is Toolbar has replaced it, but I still don't know how to hide tabs. Also, I'm not interested in pushing pages modally.
I also tried adding android:visibility="gone" to Tabbar.axml. This successfully hides the tabbar but the tabbar still occupies space.

This is a known bug in Xamarin: android:visibility="gone" in Tabbar.axml does not reclaim space (Status: CONFIRMED).
As soon as it's fixed, using above approach seems to be a way to go.

Here is the perfect solution:
Add android:visibility="gone" to Rescouces > layout > Tabbar.axml
eg:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.TabLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:tabIndicatorColor="#android:color/white"
app:tabGravity="fill"
app:tabMode="fixed"
android:visibility="gone" />
MainActivity.cs
Comment line ToolbarResource = Resource.Layout.Toolbar;
eg:
namespace BottomTab.Droid
{
[Activity(Label = "BottomTab.Droid", Icon = "#drawable/icon", Theme = "#style/MyTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
//ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
}
}
}
Add NavigationPage.SetHasNavigationBar(this, false); to each Pages in TabbedPage.
eg:
public partial class MyPage : ContentPage
{
public MyPage()
{
InitializeComponent();
NavigationPage.SetHasNavigationBar(this, false);
}
private void OnGoToProfile(object sender, EventArgs e)
{
Navigation.PushAsync(new ProfilePage());
}
}

Add non-swipeable Tab to toolbar in android

I am developing an android app. I was able to add toolbar using support library to the app. Now i want to add tabs to the app. But the tab should be non-swipeable. I searched the internet but all the questions and articles were for swipeable tabs.
toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v7.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbarsdfs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimaryDark"
app:theme="#style/ThemeOverlay.AppCompat.ActionBar">
</android.support.v7.widget.Toolbar>
</LinearLayout>
ToolbarActivty.Java
public class ToolbarActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.toolbar);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbarsdfs);
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}
}
This is what i want to acheive.

If you are not using swipable tabs try tabs by using custome Tabhoast. but the simplest is adding buttons and checnge the fragment above according to button click.

In android app Toolbar.setTitle method has no effect – application name is shown as title

I'm trying to create simple application using android-support-v7:21 library.
Code snippets:
MainActivity.java
public class MainActivity extends ActionBarActivity {
Toolbar mActionBarToolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mActionBarToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
mActionBarToolbar.setTitle("My title");
setSupportActionBar(mActionBarToolbar);
}
activity_main.xml
<LinearLayout
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:fitsSystemWindows="true"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_actionbar"
android:background="#null"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:fitsSystemWindows="true" />
</LinearLayout>
But instead of "My title" on Toolbar %application name% is shown.
Seems like setTitle method has no effect.
I would like to show "My title".
UPD:
Before, styles.xml was:
<style name="AppTheme" parent="Theme.AppCompat">
<item name="windowActionBar">false</item>
</style>
So, I thought that actionbar is not used.
I add NoActionBar to style parent:
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
<item name="windowActionBar">false</item>
</style>
But the problem is not resolved.

Found the solution:
Instead of:
mActionBarToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
mActionBarToolbar.setTitle("My title");
setSupportActionBar(mActionBarToolbar);
I used:
mActionBarToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
setSupportActionBar(mActionBarToolbar);
getSupportActionBar().setTitle("My title");
And it works.

For anyone who needs to set up the title through the Toolbar some time after setting the SupportActionBar, read this.
The internal implementation of the support library just checks if the Toolbar has a title (not null) at the moment the SupportActionBar is set up. If there is, then this title will be used instead of the window title. You can then set a dummy title while you load the real title.
mActionBarToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
mActionBarToolbar.setTitle("");
setSupportActionBar(mActionBarToolbar);
later...
mActionBarToolbar.setTitle(title);

The above answer is totally true but not working for me.
I solved my problem with the following things.
Actually My XML is like that:
<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/confirm_order_mail_layout"
android:layout_width="match_parent"
android:layout_height="fill_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/confirm_order_appbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/confirm_order_list_collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|enterAlways">
<android.support.v7.widget.Toolbar
android:id="#+id/confirm_order_toolbar_layout"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
I have tried all the option and after all I just removed CollapsingToolbarLayout because of i do not need to use in that particular XML So My Final XML is like:
<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/confirm_order_mail_layout"
android:layout_width="match_parent"
android:layout_height="fill_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/confirm_order_appbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/confirm_order_toolbar_layout"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
Now you have to use setTitle() like above answer:
mActionBarToolbar = (Toolbar) findViewById(R.id.confirm_order_toolbar_layout);
setSupportActionBar(mActionBarToolbar);
getSupportActionBar().setTitle("My Title");
Now If you want to use CollapsingToolbarLayout and Toolbar together then you have to use setTitle() of CollapsingToolbarLayout
CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.confirm_order_mail_layout);
collapsingToolbarLayout.setTitle("My Title");
May it will helps you. Thank you.

Simply you can change any activity name by using
Activityname.this.setTitle("Title Name");

Try this, you can define title directly in XML:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:title="some title"
app:popupTheme="#style/AppTheme.PopupOverlay">

To set the title for each Navbar fragment title
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
myView = inflater.inflate(R.layout.second_layout, container, false);
getActivity().setTitle("title");
return myView;
}

Try this .. this method works for me..!! hope it may help somebody..!!
<android.support.v7.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_awesome_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" >
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:singleLine="true"
android:text="Toolbar Title"
android:textColor="#android:color/white"
android:textSize="18sp"
android:textStyle="bold" />
</android.support.v7.widget.Toolbar>
To display logo in toolbar try the below snippet.
// Set drawable
toolbar.setLogo(ContextCompat.getDrawable(context, R.drawable.logo));
Let me know the result.

getSupportActionBar().setTitle("Your Title");

Please see https://code.google.com/p/android/issues/detail?id=77763. Apparently it is supposed to work like that. Once you call the setSupportActionBar() method call, it then is the responsibility of the ActionBar delegate to route the call to the correct view.

It's not just about .setTitle
more methods of Support Toolbar (Appcompat v7) in onCreate works only with
getSupportActionBar().method()
and don't work with mToolbar.method()
examples:
getSupportActionBar().setTitle("toolbar title");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
though next methods works fine without getSupportActionBar() in onCreate
mToolbar.setVisibility(View.VISIBLE);
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//
}
Problem only with onCreate event, you still can use mToolbar.setTitle() later instead of annoying getSupportActionBar().setTitle(), for example if you add this in onCreate it will work (because it will be executed later, after onCreate)
mHandler.post(new Runnable() {
#Override
public void run() {
mToolbar.setTitle("toolbar title");
}
});
I prefer to use this solution https://stackoverflow.com/a/35430590/4548520 than https://stackoverflow.com/a/26506858/4548520 because if you change title many times (in different functions) it's more comfortable to use mToolbar.setTitle() than longer getSupportActionBar().setTitle() one and you don't see annoying notification about null exception like with getSupportActionBar().setTitle()

For anyone who needs to set up the title through the Toolbar some time after setting the SupportActionBar (#sorianiv) AND your Toolbar is inside a CollapsingToolbarLayout, read this:
mToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.toolbar_layout);
Toolbar toolbar = findViewById(R.id.toolbar);
//toolbar.setTitle(""); // no need to do this
//mToolbarLayout.setTitle("Title"); // if you need an initial title, do this instead
setSupportActionBar(toolbar);
Then later,
mToolbarLayout.setTitle("New Title");

I tried to rename the toolbar from the fragment
It helped me, I hope to help someone else
Activity activity = this.getActivity();
Toolbar toolbar = (Toolbar) activity.findViewById(R.id.detail_toolbar);
if (toolbar != null) {
activity.setTitle("Title");
}
//toolbar.setTitle("Title"); did not give the same results
Screenshot:

Application title will not show as default title on every activity, you can insert different title on every activity. On your activity file bellow the onCreate just paste a single line to set title,
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("Your Title Here");
Just change the text "Your Title Here" to your text.

Simply use this in your adapter,
Where MainActivity is your AppCompactActivity.
Call it from anywhere.
((MainActivity) context).getSupportActionBar().setTitle(titles.get(position));

I made it work by using -
toolbar.post(new Runnable() {
#Override
public void run() {
toolbar.setTitle("My Title");
}
});

If you are using CollapsibleToolbarLayout along with Toolbar then you will need to set title in both the layouts
set your Toolbar as action bar in onCreate method
protected void setUpToolBar() {
if (mToolbar != null) {
((HomeActivity) getActivity()).setSupportActionBar(mToolbar);
mToolbar.setTitleTextColor(Color.WHITE);
mToolbar.setTitle("List Detail");
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getActivity()
.getSupportFragmentManager().popBackStack();
}
});
((HomeActivity) getActivity()).getSupportActionBar()
.setDisplayHomeAsUpEnabled(true);
}
}
Later simply update title of toolbar using setTitle method
mToolbar .setTitle(productFromShoppingList.getProductName());
mCollapsingToolbar.setTitle(productFromShoppingList.getProductName());

I have a strange behaviour that may can help you.
This is working but it has no effect in onCreate only:
toolbar.setTitle("title");
Try to use this in onCreate:
yourActivityName.this.setTitle("title")

This can be done by setting the android:label attribute of your activity in the AndroidManifest.xml file:
<activity android:name="my activity"
android:label="The Title I'd like to display" />
And then add this line to the onCreate():
getSupportActionBar().setDisplayShowTitleEnabled(true);

Try this:
Xml Code
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="120dp"
android:id="#+id/tool_bar"
android:background="#color/tablayout"
android:theme="#style/ToolBarStyle"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/app_name"
android:layout_gravity="center"
android:id="#+id/toolbar_title"
android:textSize="18sp"
android:textColor="#color/white"/>
</android.support.v7.widget.Toolbar>
Java Code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
toolbar_text = (TextView)findViewById(R.id.toolbar_title);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
toolbar.setLogo(R.drawable.ic_toolbar);
}

If your goal is to set a static string in the toolbar, the easiest way to do it is to simply set the activity label in AndroidManifest.xml:
<activity android:name=".xxxxActivity"
android:label="#string/string_id" />
The toolbar will get this string without any code. (works for me with v27 libraries.)

To change the title for each different activity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pizza);
setTitle(getResources().getText(R.string.title));
}

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//custom toolbaar
getSupportActionBar().setTitle("Abhijeet");
}
}

Though not immediately relevant to this particular setup, I found that removing "CollapsingToolbarLayout" from my XML that was wrapping my toolbar inside of an AppBarLayout made everything work.
So, this:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:navigationIcon="#drawable/ic_arrow_back_white_24dp" />
</android.support.design.widget.AppBarLayout>
Instead of this:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/collapsingToolbar"
android:minHeight="?attr/actionBarSize"
app:layout_scrollFlags="enterAlways|scroll|snap">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_height="?attr/actionBarSize"
app:navigationIcon="#drawable/ic_arrow_back_white_24dp" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
Then, I set the title in the activity's onCreate, before setSupportActionBar() is called.

Make sure you add this option:
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE);

The answer is in the documentation (which you can find here):
To use the ActionBar utility methods, call the activity's
getSupportActionBar() method. This method returns a reference to an
appcompat ActionBar object. Once you have that reference, you can call
any of the ActionBar methods to adjust the app bar. For example, to
hide the app bar, call ActionBar.hide().
That is the solution you actually found. Just thought of giving a reference to the official documentation (which apparently few tend to read).

In Kotlin you can do this:
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
class SettingsActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_settings)
val toolbar = findViewById<Toolbar>(R.id.toolbar)
setSupportActionBar(toolbar)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
supportActionBar?.setTitle(R.string.title)
}
override fun onSupportNavigateUp() = true.also { onBackPressed() }
}

This is happening because you are using Toolbar and ActionBar both. Now as you want to use Toolbar as an action bar, the first thing you need to do is disable the decor provided action bar.
The easiest way is to have your theme extend from Theme.AppCompat.NoActionBar.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

How to dynamically change ToolbarResource - android

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