Develop Reference

Didn't set position ActionBar Logo with NavigationDrawer android

I m using navigation drawer and want to put a launcher icon to the right of navigation drawer icon and put a title on right of launcher icon in ActionBar. I m trying this but didn't get the expected result.
Image here :
I m using
actionbar.setLogo(imageId); //to set the launchericon
actionbar.setTitle("home"); //to set the title
but the problem is, didn't able to set the launcher icon position in ActionBar.
please help me out.
Thanks in advance.

Use below code to set logo and title on your ActionBar :
RESULT / OUTPUT :
CODE:
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setLogo(R.mipmap.ic_launcher);
getSupportActionBar().setDisplayUseLogoEnabled(true);
getSupportActionBar().setTitle("Home");
FULL CODE :
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Here is the code
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setLogo(R.mipmap.ic_launcher);
getSupportActionBar().setDisplayUseLogoEnabled(true);
getSupportActionBar().setTitle("Home");
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();
}
});

I hope you mean to say that your toolbar logo is not getting displayed for a custom toolbar. A possible workaround for that would be to an <ImageView> to your custom toolbar itself and set the image.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/my_custom_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_custom"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Custom Title"
android:id="#+id/custom_title"
android:layout_toRightOf="#id/menu_icon"/>
</RelativeLayout>
</android.support.v7.widget.Toolbar>
Note that you could also add the android:centerHorizontal="true" to the textview if you want the title to be in center. Next declare the toolbar and call the textview in the required file by the id
TextView customTitle = (TextView) findViewById(R.id.custom_title);
customTitle.setText("My Custom Title");
Instead of using the getSupportActionBar().setLogo(R.mipmap.ic_launcher); we have defined it in the xml. Now use this code in the java.
ImageView cumstomIcon = (ImageView) findViewById(R.id.my_custom_icon);
customIcon.setImageResource(R.drawable.some_image);
You can also directly set the image in the xml but if you need to keep diff. images for various activities, then set the image programmatically..
Any doubts drop a comment!

Android Searchview back button color change

How to change the color of black arrow(Back button) in searchview
I have tried by customizing with below code
ImageView backid = (ImageView) searchViewAndroidActionBar.findViewById(R.id.search_button);
backid.setColorFilter(ContextCompat.getColor(Shopping_CategoriesCommon.this, R.color.white), PorterDuff.Mode.SRC_IN);
backid.setImageResource(R.drawable.search);
but it doesn't work

Add this attribute to your toolbar in xml file
app:collapseIcon
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="#dimen/toolbarHeight"
app:collapseIcon="#drawable/collapseBackIcon" />

After a day search i resolved it by adding app:collapseIcon="#drawable/back_arrow" to the custom toolbar
<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="#color/colorPrimary"
android:orientation="vertical"
app:collapseIcon="#drawable/back_arrow"/>

I could change the color using Reflection.
try {
final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
Field mCollapseIcon = toolbar.getClass().getDeclaredField("mCollapseIcon");
mCollapseIcon.setAccessible(true);
Drawable drw = (Drawable) mCollapseIcon.get(toolbar);
drw.setTint(color);
}
catch (Exception e) {
}

How to align action bar title to centre without using custom view

I want to align the action bar title to centre without the help of custom view . I would appreciate any help.
Without using the custom view, modifying only default action bar title

You can align the title to the center when you use ActionBar, but you can use Toolbar to do this.
Toolbar is more useful and easier than ActionBar, you can use this layout to define the center title TextView for you activity:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="40dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/app_name" />
</android.support.v7.widget.Toolbar>
And use this code for a back button:
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_toolbar);
Toolbar toolbar = (Toolbar) findViewById(R.id.single_toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
if(actionBar != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
You also need to override onCreateOptionsMenu method for the menu, and you can refer to this project : chrisbanes/cheesesquare.

Ok, You can try this:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" >
<TextView
android:textColor="#fff"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_gravity="center"
android:text="#string/app_name" />
</android.support.v7.widget.Toolbar>
And remember to add this line in your activity's java code:
getSupportActionBar.setTitle("");

It seems there is no way to do this without custom view. You can get the title view:
View decor = getWindow().getDecorView();
TextView title = (TextView) decor.findViewById(getResources().getIdentifier("action_bar_title", "id", "android"));
But changing of gravity or layout_gravity doesn't have an effect. The problem in the ActionBarView, which layout its children by itself so changing of layout params of its children also doesn't have an effect. To see this excecute following code:
ViewGroup actionBar = (ViewGroup) decor.findViewById(getResources().getIdentifier("action_bar", "id", "android"));
View v = actionBar.getChildAt(0);
ActionBar.LayoutParams p = new ActionBar.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
p.gravity= Gravity.CENTER;
v.setLayoutParams(p);
v.setBackgroundColor(Color.BLACK);

Android ToolBar wont show title

My Custom ToolBar is not showing up the title
image:
My Main:
Toolbar toolbar_exit = (Toolbar) findViewById(R.id.toolbar_simple_exit); // Attaching the layout to the toolbar object
setSupportActionBar(toolbar_exit); // Setting toolbar as the ActionBar with setSupportActionBar() call
getSupportActionBar().setDisplayShowTitleEnabled(true);
getSupportActionBar().setTitle("Help");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
my Manifest:
<activity
android:name=".Activities.HelpActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="Work Stupid Title"
android:theme="#style/NoActionBar" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".Activities.AtividadePrincipal" />
</activity>
why its not showing? ive tried this.setTitle and other, nothing worked

Please be specific when you ask questions by posting your customized layout files and related java code.
Set your style theme's parent of type .NoActionBar? and set the following attributes.
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="windowActionModeOverlay">true</item>

You should set a custom layout for the action bar, then set text for the textview on the custom layout of the action actionbar. This is my code:
private void setCustomActionbarView() {
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setContentInsetsAbsolute(0, 0);
setSupportActionBar(toolbar);
mActionBar = getSupportActionBar();
mActionBar.setDisplayShowHomeEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
mActionBar.setDisplayShowCustomEnabled(true);
// kiem tra lai ham nay
mActionBar.setDisplayHomeAsUpEnabled(true);
LayoutInflater mInflater = LayoutInflater.from(this);
View mActionBarView = mInflater
.inflate(R.layout.custom_actionbar, null);
mActionBar.setCustomView(mActionBarView);
}
and my custom layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res/com.orangestudio.mpromotion"
android:id="#+id/linBang"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/textAcb"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/home_khuyen_mai"
android:textColor="#color/acb_text_color"
app:font="#string/font_bold" />
Set the actionbar title:
View actionbarView = getSupportActionBar().getCustomView();
TextView text =(TextView) actionbarView.findViewById(R.id.textAcb);
text.setText("YOUR TITLE");

Android toolbar center title and custom font

I'm trying to figure out the right way to use a custom font for the toolbar title, and center it in the toolbar (client requirement).
At the moment, i'm using the good old ActionBar, and I was setting the title to empty value, and using setCustomView to put my custom font TextView and center it using ActionBar.LayoutParams.
Is there a better way to do that? Using the new Toolbar as my ActionBar.

To use a custom title in your Toolbar all you need to do is remember is that Toolbar is just a fancy ViewGroup so you can add a custom title like so:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_top"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?android:attr/actionBarSize"
android:background="#color/action_bar_bkgnd"
app:theme="#style/ToolBarTheme" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Toolbar Title"
android:layout_gravity="center"
android:id="#+id/toolbar_title" />
</android.support.v7.widget.Toolbar>
This means that you can style the TextView however you would like because it's just a regular TextView. So in your activity you can access the title like so:
Toolbar toolbarTop = (Toolbar) findViewById(R.id.toolbar_top);
TextView mTitle = (TextView) toolbarTop.findViewById(R.id.toolbar_title);

This's just to help to join all pieces using #MrEngineer13 answer with #Jonik and #Rick Sanchez comments with the right order to help to achieve title centered easly!!
The layout with TextAppearance.AppCompat.Widget.ActionBar.Title :
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay">
<TextView
android:id="#+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_gravity="center" />
</android.support.v7.widget.Toolbar>
The way to achieve with the right order:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
setSupportActionBar(toolbar);
mTitle.setText(toolbar.getTitle());
getSupportActionBar().setDisplayShowTitleEnabled(false);
Please don't forget to upvote #MrEngineer13 answer !!!
Here is a sample project ToolbarCenterTitleSample
Hope to help somebody else ;)

The ToolBar title is stylable. Any customization you make has to be made in the theme. I'll give you an example.
Toolbar layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
style="#style/ToolBarStyle.Event"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="#dimen/abc_action_bar_default_height_material" />
Styles:
<style name="ToolBarStyle" parent="ToolBarStyle.Base"/>
<style name="ToolBarStyle.Base" parent="">
<item name="popupTheme">#style/ThemeOverlay.AppCompat.Light</item>
<item name="theme">#style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>
<style name="ToolBarStyle.Event" parent="ToolBarStyle">
<item name="titleTextAppearance">#style/TextAppearance.Widget.Event.Toolbar.Title</item>
</style>
<style name="TextAppearance.Widget.Event.Toolbar.Title" parent="TextAppearance.Widget.AppCompat.Toolbar.Title">
<!--Any text styling can be done here-->
<item name="android:textStyle">normal</item>
<item name="android:textSize">#dimen/event_title_text_size</item>
</style>

we don't have direct access to the ToolBar title TextView so we use reflection to access it.
private TextView getActionBarTextView() {
TextView titleTextView = null;
try {
Field f = mToolBar.getClass().getDeclaredField("mTitleTextView");
f.setAccessible(true);
titleTextView = (TextView) f.get(mToolBar);
} catch (NoSuchFieldException e) {
} catch (IllegalAccessException e) {
}
return titleTextView;
}

Define the following class:
public class CenteredToolbar extends Toolbar {
private TextView centeredTitleTextView;
public CenteredToolbar(Context context) {
super(context);
}
public CenteredToolbar(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public CenteredToolbar(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
public void setTitle(#StringRes int resId) {
String s = getResources().getString(resId);
setTitle(s);
}
#Override
public void setTitle(CharSequence title) {
getCenteredTitleTextView().setText(title);
}
#Override
public CharSequence getTitle() {
return getCenteredTitleTextView().getText().toString();
}
public void setTypeface(Typeface font) {
getCenteredTitleTextView().setTypeface(font);
}
private TextView getCenteredTitleTextView() {
if (centeredTitleTextView == null) {
centeredTitleTextView = new TextView(getContext());
centeredTitleTextView.setTypeface(...);
centeredTitleTextView.setSingleLine();
centeredTitleTextView.setEllipsize(TextUtils.TruncateAt.END);
centeredTitleTextView.setGravity(Gravity.CENTER);
centeredTitleTextView.setTextAppearance(getContext(), R.style.TextAppearance_AppCompat_Widget_ActionBar_Title);
Toolbar.LayoutParams lp = new Toolbar.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
lp.gravity = Gravity.CENTER;
centeredTitleTextView.setLayoutParams(lp);
addView(centeredTitleTextView);
}
return centeredTitleTextView;
}
}
...and then just use it instead of regular Toolbar like this:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorAccent">
<your.packagename.here.CenteredToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:title="#string/reset_password_page_title"/>
<!-- Other views -->
</RelativeLayout>
You still need these 2 lines of code in your Activity (as with standard Toolbar):
Toolbar toolbar = (Toolbar) findViewByid(R.id.toolbar); // note that your activity doesn't need to know that it is actually a custom Toolbar
setSupportActionBar(binding.toolbar);
That's it! You don't need to hide the standard left-aligned title, don't need to duplicate the same XML code over and over, etc., just use CenteredToolbar like if it was default Toolbar. You can also set your custom font programatically since you now have direct access to the TextView. Hope this helps.

MaterialToolbar from Material Components 1.4.0-alpha02 now has the ability to center the toolbar's title by setting the titleCentered attribute to true:
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/topAppBar"
style="#style/Widget.MaterialComponents.Toolbar.Primary"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:titleCentered="true" />
</com.google.android.material.appbar.AppBarLayout>

Here is title text dependant approach to find TextView instance from Toolbar.
public static TextView getToolbarTitleView(ActionBarActivity activity, Toolbar toolbar){
ActionBar actionBar = activity.getSupportActionBar();
CharSequence actionbarTitle = null;
if(actionBar != null)
actionbarTitle = actionBar.getTitle();
actionbarTitle = TextUtils.isEmpty(actionbarTitle) ? toolbar.getTitle() : actionbarTitle;
if(TextUtils.isEmpty(actionbarTitle)) return null;
// can't find if title not set
for(int i= 0; i < toolbar.getChildCount(); i++){
View v = toolbar.getChildAt(i);
if(v != null && v instanceof TextView){
TextView t = (TextView) v;
CharSequence title = t.getText();
if(!TextUtils.isEmpty(title) && actionbarTitle.equals(title) && t.getId() == View.NO_ID){
//Toolbar does not assign id to views with layout params SYSTEM, hence getId() == View.NO_ID
//in same manner subtitle TextView can be obtained.
return t;
}
}
}
return null;
}

No one has mentioned this, but there are some attributes for Toolbar:
app:titleTextColor for setting the title text color
app:titleTextAppearance for setting the title text appearance
app:titleMargin for setting the margin
And there are other specific-side margins such as marginStart, etc.

I use this solution:
static void centerToolbarTitle(#NonNull final Toolbar toolbar) {
final CharSequence title = toolbar.getTitle();
final ArrayList<View> outViews = new ArrayList<>(1);
toolbar.findViewsWithText(outViews, title, View.FIND_VIEWS_WITH_TEXT);
if (!outViews.isEmpty()) {
final TextView titleView = (TextView) outViews.get(0);
titleView.setGravity(Gravity.CENTER);
final Toolbar.LayoutParams layoutParams = (Toolbar.LayoutParams) titleView.getLayoutParams();
layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
toolbar.requestLayout();
//also you can use titleView for changing font: titleView.setTypeface(Typeface);
}
}

Without toolbar TextView we can customize font by using below code
getSupportActionBar().setDisplayShowTitleEnabled(false);
or
getActionBar().setDisplayShowTitleEnabled(false);
public void updateActionbar(String title){
SpannableString spannableString = new SpannableString(title);
spannableString.setSpan(new TypefaceSpanString(this, "futurastdmedium.ttf"),
0, spannableString.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mToolbar.setTitle(spannableString);
}

public class TestActivity extends AppCompatActivity {
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_test);
toolbar = (Toolbar) findViewById(R.id.tool_bar); // Attaching the layout to the toolbar object
setSupportActionBar(toolbar);
customizeToolbar(toolbar);
}
public void customizeToolbar(Toolbar toolbar){
// Save current title and subtitle
final CharSequence originalTitle = toolbar.getTitle();
final CharSequence originalSubtitle = toolbar.getSubtitle();
// Temporarily modify title and subtitle to help detecting each
toolbar.setTitle("title");
toolbar.setSubtitle("subtitle");
for(int i = 0; i < toolbar.getChildCount(); i++){
View view = toolbar.getChildAt(i);
if(view instanceof TextView){
TextView textView = (TextView) view;
if(textView.getText().equals("title")){
// Customize title's TextView
Toolbar.LayoutParams params = new Toolbar.LayoutParams(Toolbar.LayoutParams.WRAP_CONTENT, Toolbar.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.CENTER_HORIZONTAL;
textView.setLayoutParams(params);
// Apply custom font using the Calligraphy library
Typeface typeface = TypefaceUtils.load(getAssets(), "fonts/myfont-1.otf");
textView.setTypeface(typeface);
} else if(textView.getText().equals("subtitle")){
// Customize subtitle's TextView
Toolbar.LayoutParams params = new Toolbar.LayoutParams(Toolbar.LayoutParams.WRAP_CONTENT, Toolbar.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.CENTER_HORIZONTAL;
textView.setLayoutParams(params);
// Apply custom font using the Calligraphy library
Typeface typeface = TypefaceUtils.load(getAssets(), "fonts/myfont-2.otf");
textView.setTypeface(typeface);
}
}
}
// Restore title and subtitle
toolbar.setTitle(originalTitle);
toolbar.setSubtitle(originalSubtitle);
}
}

Layout:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_top"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize"
android:background="#color/action_bar_bkgnd"
app:theme="#style/ToolBarTheme" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Toolbar Title"
android:layout_gravity="center"
android:gravity="center"
android:id="#+id/toolbar_title" />
</android.support.v7.widget.Toolbar>
Code:
Toolbar mToolbar = parent.findViewById(R.id.toolbar_top);
TextView mToolbarCustomTitle = parent.findViewById(R.id.toolbar_title);
//setup width of custom title to match in parent toolbar
mToolbar.postDelayed(new Runnable()
{
#Override
public void run ()
{
int maxWidth = mToolbar.getWidth();
int titleWidth = mToolbarCustomTitle.getWidth();
int iconWidth = maxWidth - titleWidth;
if (iconWidth > 0)
{
//icons (drawer, menu) are on left and right side
int width = maxWidth - iconWidth * 2;
mToolbarCustomTitle.setMinimumWidth(width);
mToolbarCustomTitle.getLayoutParams().width = width;
}
}
}, 0);

A very quick and easy way to set a custom font is to use a custom titleTextAppearance with a fontFamily:
Add to styles.xml:
<style name="ToolbarTitle" parent="TextAppearance.Widget.AppCompat.Toolbar.Title">
<item name="android:textSize">16sp</item>
<item name="android:textColor">#FF202230</item>
<item name="android:fontFamily">#font/varela_round_regular</item>
</style>
In your res folder create a font folder (Ex: varela_round_regular.ttf)
Read the official guide to find out more https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html

Solution that I used for this problem:
public static void applyFontForToolbarTitle(Activity a){
Toolbar toolbar = (Toolbar) a.findViewById(R.id.app_bar);
for(int i = 0; i < toolbar.getChildCount(); i++){
View view = toolbar.getChildAt(i);
if(view instanceof TextView){
TextView tv = (TextView) view;
if(tv.getText().equals(a.getTitle())){
tv.setTypeface(getRuneTypefaceBold(a));
break;
}
}
}
}
For center gravity I think it would be necessary to change layout params to match_parent horizontally and then:
tv.setGravity(Gravity.CENTER);

I don't know if anything changed in the appcompat library but it's fairly trivial, no need for reflection.
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// loop through all toolbar children right after setting support
// action bar because the text view has no id assigned
// also make sure that the activity has some title here
// because calling setText() with an empty string actually
// removes the text view from the toolbar
TextView toolbarTitle = null;
for (int i = 0; i < toolbar.getChildCount(); ++i) {
View child = toolbar.getChildAt(i);
// assuming that the title is the first instance of TextView
// you can also check if the title string matches
if (child instanceof TextView) {
toolbarTitle = (TextView)child;
break;
}
}

I solved this solution , And this is a following codes:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Order History"
android:layout_gravity="center"
android:id="#+id/toolbar_title"
android:textSize="17sp"
android:textStyle="bold"
android:textColor="#color/colorWhite"
/>
</android.support.v7.widget.Toolbar>
And you can change title/label , in Activity, write a below codes:
Toolbar toolbarTop = (Toolbar) findViewById(R.id.toolbar_top);
TextView mTitle = (TextView) toolbarTop.findViewById(R.id.toolbar_title);
mTitle.setText("#string/....");

You can use like the following
<android.support.v7.widget.Toolbar
android:id="#+id/top_actionbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppThemeToolbar">
<TextView
android:id="#+id/pageTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
/>
</android.support.v7.widget.Toolbar>

With the Material Components, starting from the version 1.4.x as described in the doc you can use the MaterialToolbar.
Just add the attribute app:titleCentered and/or app:subtitleCentered attributes to true on your MaterialToolbar.
Something like:
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/topAppBar"
app:titleCentered="true"
... />
With Compose using the Material3 package you can simply use the CenterAlignedTopAppBar:
CenterAlignedTopAppBar(
title = { Text("Centered TopAppBar") },
navigationIcon = {
IconButton(onClick = { /* doSomething() */ }) {
Icon(
imageVector = Icons.Filled.Menu,
contentDescription = "Localized description"
)
}
}
)
If you are using Compose and the Material2 package, there isn't a builtin component but you can customize the layout of content inside the TopAppBar as described in this answer.

Update from #MrEngineer13's answer: to align title center in any cases, including Hamburger icon, option menus, you can add a FrameLayout in toolbar like this:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_top"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize"
android:background="#color/action_bar_bkgnd"
app:theme="#style/ToolBarTheme" >
<FrameLayout android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Toolbar Title"
android:layout_gravity="center"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:id="#+id/toolbar_title" />
</FrameLayout>
</android.support.v7.widget.Toolbar>

Now using Material Design 3 we can align the title in the center without doing extra work or without adding a text view in the toolbar
Added below dependencies in build.gradle file
implementation 'com.google.android.material:material:1.6.1'
To align the title in the center We need to use the below properly
app:titleCentered="true"
To align subtitles in the center we need to use the below property
app:subtitleCentered="true"
Sample Code
<?xml version="1.0" encoding="utf-8"?>
<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">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/topAppBar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:title="AskNilesh"
app:subtitle="Nilesh"
app:subtitleCentered="true"
app:menu="#menu/top_app_bar"
app:titleCentered="true"
app:navigationIcon="#drawable/ic_android_black_24dp" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
OUTPUT

Even though adding a text view to the toolbar can solve the problem of the restriction of title styling, there is an issue with it. Since we are not adding it to a layout, we do not have too much control over its width. We can either use wrap_content or match_parent.
Now consider a scenario where we have a searchView as a button on the right edge of the toolbar. If the title contents are more, it will go on top of the button obscuring it. There is no way of controlling this short of setting a width to the label and is something you don't want to do if you want to have a responsive design.
So, here is a solution that worked for me which is slightly different from adding a textview to the toolbar. Instead of that, add the toolbar and text view to a relative layout and ensure that the text view is on top of the toolbar. Then we can use appropriate margins and make sure the text view shows up where we want it to show up.
Make sure you set the toolbar to not show the title.
Here is the XML for this solution:
<RelativeLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary">
<android.support.v7.widget.Toolbar
android:theme="#style/ThemeOverlay.AppCompat.Dark"
android:id="#+id/activity_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:titleTextAppearance="#style/AppTheme.TitleTextView"
android:layout_marginRight="40dp"
android:layoutMode="clipBounds">
<android.support.v7.widget.SearchView
android:id="#+id/search_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:foregroundTint="#color/white" />
</android.support.v7.widget.Toolbar>
<TextView
android:id="#+id/toolbar_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="90dp"
android:text="#string/app_name"
android:textSize="#dimen/title_text_size"
android:textColor="#color/white"
android:lines="1"
android:layout_marginLeft="72dp"
android:layout_centerVertical="true" />
</RelativeLayout>
Solves the issue #ankur-chaudhary mentioned above.

Since android.support.v7.appcompat 24.2 Toolbar has method setTitleTextAppearance and you can set its font without external textview.
create new style in styles.xml
<style name="RobotoBoldTextAppearance">
<item name="android:fontFamily">#font/roboto_condensed_bold</item>
</style>
and use it
mToolbar.setTitleTextAppearance(this, R.style.RobotoBoldTextAppearance);

I spent several days searching for a universal solution. My toolbar working with android menu and nav icon.
At first, you need create custom toolbar class. This class must have calculate title centered positions (paddings):
class CenteredToolbar #JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0)
: Toolbar(context, attrs, defStyleAttr) {
init {
addOnLayoutChangeListener(object : View.OnLayoutChangeListener {
override fun onLayoutChange(v: View?, left: Int, top: Int, right: Int, bottom: Int, oldLeft: Int, oldTop: Int, oldRight: Int, oldBottom: Int) {
val titleTextView = findViewById<TextView>(R.id.centerTitle)
val x = titleTextView.x.toInt()
val x2 = x + titleTextView.width
val fullWidth = width
val fullCenter = fullWidth / 2
val offsetLeft = Math.abs(fullCenter - x)
val offsetRight = Math.abs(x2 - fullCenter)
val differOffset = Math.abs(offsetLeft - offsetRight)
if (offsetLeft > offsetRight) {
titleTextView.setPadding(differOffset, 0, 0, 0)
} else if (offsetRight > offsetLeft) {
titleTextView.setPadding(0, 0, differOffset, 0)
}
removeOnLayoutChangeListener(this)
}
})
}
override fun setTitle(resId: Int) = getTitleView().setText(resId)
override fun setTitle(title: CharSequence?) = getTitleView().setText(title)
fun getTitleView(): TextView = findViewById(R.id.centerTitle)
}
Secondly, you need create layout toolbar:
<CenteredToolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar">
<TextView
android:id="#+id/centerTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</CenteredToolbar>
That's all

Try taking Toolbar and tittle in a separate view. Take a view on right end and given them weight equal to the toolbar weight. In this way your tittle will come in center.
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
android:background="#color/white_color">
<LinearLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white_color">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="0dp"
android:layout_height="?attr/actionBarSize"
android:background="#color/white_color"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
android:layout_weight="0.2"
app:contentInsetStartWithNavigation="0dp"
app:navigationIcon="#color/greyTextColor">
</android.support.v7.widget.Toolbar>
<com.an.customfontview.CustomTextView
android:id="#+id/headingText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.6"
android:gravity="center"
android:text="Heading"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textColor="#color/colorPrimary"
android:textSize="#dimen/keyboard_number"
android:layout_gravity="center_horizontal|center_vertical"
app:textFontPath="fonts/regular.ttf" />
<ImageView
android:id="#+id/search_icon"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:visibility="visible"
android:layout_weight="0.2"
android:layout_gravity="center_horizontal|center_vertical"
android:src="#drawable/portfolio_icon"/>
</LinearLayout>
</android.support.design.widget.AppBarLayout>

You can insert this code in your xml file
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimaryDark"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Toolbar Title"
android:textColor="#000000"
android:textSize="20dp"
android:id="#+id/toolbar_title" />
</androidx.appcompat.widget.Toolbar>

To use a custom title in your Toolbar you can add a custom title like :
<?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="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="5dp"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark">
<LinearLayout
android:id="#+id/lnrTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:id="#+id/txvHeader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center"
android:gravity="center"
android:ellipsize="end"
android:maxLines="1"
android:text="Header"
android:textColor="#color/white"
android:textSize="18sp" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
Java Code:
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
if (getSupportActionBar() == null)
return;
getSupportActionBar().setTitle("Title");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

Use com.google.android.material.appbar.MaterialToolbar and app:titleCentered="true" tag
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:titleCentered="true" />

private void makeTitleCenter(String title, Toolbar toolbar) {
if (title != null && !TextUtils.isEmpty(title.trim())) {
final String tag = " ";
if (getSupportActionBar() != null) {
getSupportActionBar().setTitle(tag);
}
TextView titleTv = null;
View leftBtn = null;
for (int i = 0; i < toolbar.getChildCount(); i++) {
View view = toolbar.getChildAt(i);
CharSequence text = null;
if (view instanceof TextView && (text = ((TextView) view).getText()) != null && text.equals(tag)) {
titleTv = (TextView) view;
} else if (view instanceof ImageButton) {
leftBtn = view;
}
}
if (titleTv != null) {
final TextView fTitleTv = titleTv;
final View fLeftBtn = leftBtn;
fTitleTv.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
fTitleTv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
int leftWidgetWidth = fLeftBtn != null ? fLeftBtn.getWidth() : 0;
fTitleTv.setPadding(DimenUtil.getResources().getDisplayMetrics().widthPixels / 2 - leftWidgetWidth - fTitleTv.getWidth() / 2, 0, 0, 0);
fTitleTv.requestLayout();
}
});
}
}
}

for custom font in toolbar you can override textView font in style and then every textView in your app also toolbar title font changed automatically
i tested it in android studio 3.1.3
in style do it:
<style name="defaultTextViewStyle" parent="android:Widget.TextView">
<item name="android:fontFamily">#font/your_custom_font</item>
</style>
and then in your theme use this:
<item name="android:textViewStyle">#style/defaultTextViewStyle</item>

I found another way to add custom toolbar without any adicional Java/Kotlin code.
First: create a XML with your custom toolbar layout with AppBarLayout as the parent:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout
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="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay">
<ImageView
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginEnd="#dimen/magin_default"
android:src="#drawable/logo" />
</android.support.v7.widget.Toolbar>
Second: Include the toolbar in your layout:
<?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/blue"
tools:context=".app.MainAcitivity"
tools:layout_editor_absoluteY="81dp">
<include
layout="#layout/toolbar_inicio"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<!-- Put your layout here -->
</android.support.constraint.ConstraintLayout>