setSupportActionBar() throws Nullpointer exception

Question

I am new to android and i was following following tutorial for Material Design Toolbar :

http://www.android4devs.com/2014/12/how-to-make-material-design-app.         


        

Answer 1

Before adding toolbar you need to remove action from your style like

Now define toolbar in res/xml/toolbar.xml

Now include this toolbar in our activity layout xml like

Note : Now while defining toolbar in activity we will use "tool_bar" as id not "appbar" id

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar actionbar = (Toolbar) findViewById(R.id.tool_bar);
        setSupportActionBar(actionbar);
    }
}

Now you can see in your activity toolbar