android app Toolbar.setTitle error Attemp to invoke virtual method 'void.androidx.appcompat.widget'

Question

Trying to create android simple app using this code:

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("mytitle");

and this

Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setTitle("mytitle");
setSupportActionBar(toolbar);

in Android X both of them can't use, please help how to set title toolbar?

Answer 1

I think you are importing the wrong toolbar class, or rather two different toolbar classes in xml and java code

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("mytitle");

This code should work