Develop Reference

Change the toolbar title during execution Android

When I start the app I want to display the app name as a placeholder. After getting the user's info, I want to change the title to a variable related to this user.
If I initially do this:
toolbar = findViewById(R.id.toolbar);
toolbar.setTitle("");
setSupportActionBar(toolbar);
And then after a while do this:
toolbar.setTitle(user.getName());
It works fine.
But! If instead of setting the title to an empty string I set it to a non empty string it doesn't work. I assume Android is checking if the title is empty before placing it or something. Is there a way to get this to work?

Call setSupportActionBar(toolbar); again after setting toolbar title with user's name.
toolbar.setTitle(user.getName());
setSupportActionBar(toolbar);

I use :
getSupportActionBar().setTitle("New title");
and it works. Give it a try.

how to set title in toolbar?

Seems pretty simple question, but could't find any answer.
How to change the toolbar title.
The toolbar is created by AppCompat Activity,not a custom created one.
It has the app name as default.I would like to change its Name corresponding to the action the activity performs.
Note : I can change custom toolbar title using the below code,so please i am not looking for that.
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle("My Title");

You can set default Toolbar title as following:
YourActivity.this.setTitle("Your Title");
For fragment:
getActivity().setTitle("Your Title");

getSupportActionBar().setTitle("Title")

Set ActionBar title based on your need
ActionBar ab = getActionBar();
ab.setTitle("My Title");

Change the App name to some other text in the top bar

Can please someone tell me how to change the App name in the top bar of my android App that gets displayed by default to some other text? I have seen this in a few Apps I used before. I'm building my first Android App and don't have that much experience with this stuff... thank you :)

after
setContentView(R.layout.layout_name);
simply add
setTitle("title_name");
this will change the name of your current activity in top bar or toolbar and i think your activity should extend AppCompactActivity

it is easier if you convert the actionbar (which I think is the bar you mean) into a toolbar if you want to do further modifications to it (as I assume):
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
to change the title then simply call actionbar.setTitle as shown here:
actionBar = getSupportActionBar();
actionBar.setTitle("Your Title");
and if you want a subtitle add:
actionBar.setSubtitle("Your Subtitle");

If you are using the new support library, you should use this:
Toolbar toolber = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(Toolbar);
getSupportActionBar().setTitle("App Title");

Toolbar with text

I have a Toolbar with text "App de prueba" and a menu icon, but the app name is on the left side, how can delete the app name?
Thanks!

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);

Just call the setTitle() method in your activity's onCreate and pass an empty String in it - setTitle("") (assuming you are using a custom layout as title in your toolbar). You cannot remove or change the visibility of the title view in the activity as the id of this view is not public. There are ways by which you can still access the id by using reflection but that makes the code messy and therefore is not needed.

SetHomeButtonEnabled not working but setDisplayHomeAsUpEnabled is working

I want to add the application icon in the actionbar for all the activities in my application and on the icon click , I would like to navigate to the home page of my application.
I tried with the following code in onCreate
ActionBar actionBar = getSupportActionBar();
actionBar.setLogo(R.drawable.ic_launcher);
actionBar.setDisplayUseLogoEnabled(true);
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setHomeButtonEnabled(true);
Now the application icon is coming in the actionbar , but on clicking it, onOptionsItemSelected is not getting called. But if use actionBar.setDisplayHomeAsUpEnabled(true) instead of actionBar.setHomeButtonEnabled(true) , onOptionsItemSelected is getting called with item.getItemId() . Below is the code snippet
ActionBar actionBar = getSupportActionBar();
actionBar.setLogo(R.drawable.ic_launcher);
actionBar.setDisplayUseLogoEnabled(true);
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
The documentation says using both setDisplayHomeAsUpEnabled and setHomeButtonEnabled , onOptionsItemSelected will be called and the only difference is the up arrow. I dont need the up arrow in the actionbar, I only require the application icon. How can that be done?
My minSdkVersion 14 and targetSdkVersion 21.

From http://developer.android.com/reference/android/app/ActionBar.html#setHomeAsUpIndicator(int)
You can use:
actionBar.setHomeAsUpIndicator(R.drawable.ic_launcher);
actionBar.setDisplayShowHomeAsUpEnabled(true);
and this should replace the back arrow with your icon

you can use this:
Toolbar toolbar = (Toolbar) findViewById(R.id.myToolbar);
toolbar.setNavigationIcon(R.drawable.ic_back);
setSupportActionBar(toolbar);
toolbar.setNavigationOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view){
finish();
}
});

You can use :
getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp);
fist code shows left arrow on toolbar and second code lets you to put your icon