title: Toolbar Has Automatically Set Margins
body: <p>I made a Material Design Toolbar, but the end product results in a toolbar with margins on the top, left, and right sides of the toolbar. How do I make it so that the toolbar doesn't have these margins?</p>
  
  <p>My Code:</p>
  
  <p>app_bar.xml</p>
  
  <pre><code>&lt;android.support.v7.widget.Toolbar         
  
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@color/primaryColor"
      android:elevation="4dp"
      android:minHeight="?attr/actionBarSize"&gt;
  </code></pre>
  
  <p></p>
  
  <p>MainActivity.java (AppCompatActivity is extended)</p>
  
  <pre><code>public Toolbar toolbar;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      toolbar = (Toolbar) findViewById(R.id.app_bar);
      setSupportActionBar(toolbar);
  } 
  </code></pre>
  
  <p>activity_main.xml</p>
  
  <pre><code>&lt;include
      android:id="@+id/app_bar"
      layout="@layout/app_bar" /&gt;
  </code></pre>
  
  <p>I don't understand why the toolbar/appbar is not fitting the entire width of the screen. Please help!</p>