ActMain

ActMain.java

public class ActMain extends ActionBarActivity {

private Toolbar mToolbar;
private android.support.v7.app.ActionBar abMain = null;

// https://gist.github.com/castorflex/4e46a9dc2c3a4245a28e
public static CircleProgressView mProgressToolbar;

 @Override
 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.act_main);
        
         /* 
         finds the toolbar view in act_main.xml
         */
        mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
         
         /*
         this sets your toolbar to act as you would expext
         your typical actionbar to work
         */
        setSupportActionBar(mToolbar);
        
         /*
         I'm setting the top left icon to a drawer hamburger here
         */
        mToolbar.setNavigationIcon(R.drawable.ic_menu_white_24dp);
        
        /*
        If you want to reference your Toolbar as an ActionBar variable 
        at some point you can do this
        */
        abMain = getSupportActionBar();
        abMain.setHomeButtonEnabled(true);

        /*
        finds the CircleProgressView for use later
        */
        mProgressToolbar = (CircleProgressView) findViewById(R.id.progress_spinner);
 }
 
 /*
 Calling setToolbarProgress from anywhere in your app while 
 ActMain is visible, will cause the circular progress bar to 
 toggle it's visiblility within the toolbar, this acts as a 
 replacement to setSupportProgressBarIndeterminateVisibility(boolean); 
 now that the toolbar doesn't support it.
 */
 public static void setToolbarProgress(boolean show) {
        if (show) {
            mProgressToolbar.setVisibility(View.VISIBLE);
        } else {
            mProgressToolbar.setVisibility(View.GONE);
        }
 }

}