Develop Reference

How to dynamically change ToolbarResource

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>

Toolbar not responding to Listview scroll events

I have an activity which contains a custom toolbar and a simple listview. I want the toolbar respond when the listview is scrolled. However, it is not working.
Here is the .xml file
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.abdralabs.talksee.HistoryActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/history_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/history_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/title"
app:layout_scrollFlags="scroll|enterAlways">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/lv_history"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</ListView>
Here is the .java file
public class HistoryActivity extends AppCompatActivity {
Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_history);
toolbar = (Toolbar)findViewById(R.id.history_toolbar);
/*
setSupportActionBar(toolbar);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
*/
toolbar.setTitle("History");
String[] rcArray = {"A","B","C","D","A","B","C","D","A","B","C","D","A","B","C","D","A","B","C","D","A","B","C","D","A","B","C","D"};
ArrayAdapter adapter = new ArrayAdapter<String>(this,
R.layout.list_history, rcArray);
ListView listView = (ListView) findViewById(R.id.lv_history);
listView.setAdapter(adapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
/*
switch (item.getItemId()){
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
break;
}
*/
return super.onOptionsItemSelected(item);
}
}
What have I done wrong?
EDIT:
In response to rafsanahmad007's answer
I have applied the changes as per your suggestion but still there is no change.
When I scroll through the ListView there is no change to the size of the ToolBar. However, when I click on the ToolBar itself and make an up & down motion the ToolBar moves up & down too. What I want to achieve is, when I scroll the ListView downwards the ToolBar should collapse and when I scroll the ListView upwards the ToolBar should get to its normal size/position.
The following pictures depict how the ToolBar is responding currently.
As you can see in the above pics, the ListView is not being scrolled, but the ToolBar itself is being scrolled. What I want is, when I scroll the ListView the ToolBar should scroll only during that time. I hope I have clarified myself.

try this:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:minHeight="80dp"
app:layout_scrollFlags="scroll|enterAlwaysCollapsed" />
</android.support.design.widget.AppBarLayout>
you can also get Help from Here

Tabs in Toolbar without Viewpager in android

I have gone through lot of answers in SO and didn't get any proper solution to implement the Tabs in Toolbar without Viewpager.
I have gone through the SlidingTabsBasic example available in sdk samples, however, that didn't meet my requirements.
Please help me to implement the Tabs in Toolbar without Viewpager.
Please don't suggest me to use Viewpager, because my app should not support that as per the UI.

Now, we have android support design library to implement the Tabs using android.support.design.widget.TabLayout. Here is the snapshot of code. Hope this will help for someone.
public class MainActivity extends AppCompactActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab2"));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
//load fragment or do whatever you want
Fragment fragment = new MyFragment();
getFragmentManager()
.beginTransaction().replace(R.id.containerLayout, fragment).commit();
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
}
activity_main.xml code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<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/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/containerLayout">
</LinearLayout>

Please help me to implement the Tabs in Toolbar without Viewpager.
The Toolbar class does not support any form of tabs, with or without a ViewPager.
If you want a tabbed UI, and you do not want to use ViewPager, you are welcome to use FragmentTabHost or create your own tab UI yourself.

Access Toolbar (and its children) from fragment?

I'm building an application using the v7.widget.Toolbar component.
I'm able to add the toolbar to my activity, but I don't know how (and what is the right way?) to access it from the activity's fragment.
Here's the toolbar
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
app:theme="#style/MainActionBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
tools:context=".MainActivity">
<ImageView
android:background="#drawable/icon_1"
android:paddingLeft="1dp"
android:paddingRight="1dp"
android:layout_marginLeft="19dp"
android:id="#+id/menu_1"
android:layout_gravity="center_vertical|left"
android:src="#drawable/menu_burger"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:layout_marginRight="19dp"
android:paddingLeft="1dp"
android:paddingRight="1dp"
android:id="#+id/menu_2"
android:layout_gravity="center_vertical|right"
android:src="#drawable/icon_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
Here's how I use it in the activity:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="#layout/view_home_toolbar" />
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
...
...
</LinearLayout>
In my activity's onCreate:
Toolbar actionBar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(actionBar);
And now, for example, I want to access "#id/menu_1" from the Toolbar in my fragment, How do I do that?
getSupportActionBar() gives me the ActionBar, but I need the Toolbar
Thanks in advance!

no need to code a lot: follow this
in Kotlin:
var toolbar = activity.findViewById<Toolbar>(R.id.toolbar)
toolbar.setTitle("Rashid")
in Java:
Toolbar toolbar = getActivity().findViewById(R.id.toolbar);
toolbar.setTitle("Rashid")

I'm not sure if this works, but you can try it.
final AppCompatActivity act = (AppCompatActivity) getActivity();
if (act.getSupportActionBar() != null) {
Toolbar toolbar = (Toolbar) act.getSupportActionBar().getCustomView();
}
Toolbar is essentially a ViewGroup.

The communication between Activity and Fragments (the same holds for any Java components) should be done through an Interface.
For your case define an interface
public interface IOperateOnToolbar {
//methods allowing to communicate with toolbar
public void setToolbarColor(Color c);
public void setImageView1Resource(int resID);
public void setImageView2Resource(int resID);
//.....
}
So you have an Activity
public class MainActivity extends AppCompatActivity implements IOperateOnToolbar {
//onCreate, onDestroy ...
public void setToolbarColor(Color c) {
//implementation follows
}
public void setImageView1Resource(int resID) {
imageView1.setBackgroundResource(resID);
}
public void setImageView2Resource(int resID) {
imageView2.setBackgroundResource(resID);
}
}
And your Fragment
public class MyFragment extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
IOperateOnToolbar toolbarCallback = (IOperateOnToolbar) getActivity();
}
}
Using the interfaces for communication between components has the following benefits:
If you replace the "MainActivity" with another one ("ActivityX" which also implements IOperateOnToolbar), you don't have to edit anything in "MyFragment"
"MyFragment" has access only to those methods, which are exposed by IOperateOnToolbar interface.
Please chceck this docu, where google advises the communication (between fragments, but should be the in principle the same) using interfaces.

this will do the job for you
((MainAcivity)this.getActivity()).getToolbar();

Here you can access toolbar children:
TextView toolbarTextView = (TextView) ((MainActivity) this.getActivity()).findViewById(R.id.toolbarTitle);
toolbarTextView.setText("Hello");

In my case I has an activity and a navigation drawer that replaces this activity fragment with other fragments.
If you implement toolbar views (spinners, Buttons..) in the main activity,
the fragments that will be replaced in this activity can see toolbar and interact with its views.
else if, you need to handle actions depending on this views, you can use: getActivity.findViewById(); inside fragment.

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.