title: Hide app title on support.v7.widget.toolbar
body: <p>I'm starting to develop a new app and I'm triying to give it a material design look. For this, I'm using the v7 support compatibility.</p>
  
  <p>In some activities of the app, I need the toolbar not to show the app title that, I don't know how, but it is showing by default. In those activities, I have a textview at the right side of the toolbar that acts like a button, and where I have implemented traex's <a href="https://github.com/traex/RippleEffect" rel="noreferrer">RippleEffect</a>.</p>
  
  <p>So, basically my question is, how can I hide the app's title from the toolbar? Because even if I do:</p>
  
  <pre><code>toolbar.setTitle("");
  </code></pre>
  
  <p>or</p>
  
  <pre><code>toolbar.setTitle(null);
  </code></pre>
  
  <p>it continues appearing.</p>
  
  <p>This is my code:</p>
  
  <p>Custom toolbar xml [toolbar_intro.xml]:</p>
  
  <pre><code>&lt;android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:local="http://schemas.android.com/apk/res-auto"
      xmlns:ripple="http://schemas.android.com/apk/res-auto"
      xmlns:app="http://schemas.android.com/tools"
      android:id="@+id/toolbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:minHeight="?attr/actionBarSize"
      android:background="?attr/colorPrimary"
      android:elevation="4dp"
      local:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
      local:popupTheme="@style/ThemeOverlay.AppCompat.Light"&gt;
  
      &lt;com.andexert.library.RippleView
          android:id="@+id/more"
          android:layout_width="wrap_content"
          android:layout_height="fill_parent"
          android:layout_gravity="right"
          android:layout_marginRight="40dp"
          ripple:rv_centered="false"
          app:rv_rippleDuration="1"&gt;
  
          &lt;TextView
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:id="@+id/toolbar_text"
              android:textColor="@color/White"
              android:textStyle="bold"
              android:textSize="25sp"
              android:text="Next"/&gt;
      &lt;/com.andexert.library.RippleView&gt;
  &lt;/android.support.v7.widget.Toolbar&gt;
  </code></pre>
  
  <p>This is how I include the toolbar in the layout:</p>
  
  <pre><code>&lt;LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;
  
      &lt;include
          android:id="@+id/toolbar"
          layout="@layout/toolbar_intro" /&gt;
  
      &lt;RelativeLayout
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"&gt;
  
          &lt;ImageView
              ...
  
      &lt;/RelativeLayout&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>And this is the activity:</p>
  
  <pre><code>@Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.intro_wellcome);
  
      toolbar= (Toolbar) findViewById(R.id.toolbar);
      if (toolbar != null) {
          setSupportActionBar(toolbar);
          toolbar.setTitle("");
      }
  
      TextView toolbar_text = (TextView) toolbar.findViewById(R.id.toolbar_text);
      toolbar_text.setText(R.string.next);
  
      ...
  
  }
  </code></pre>
  
  <p>Also, this is the style that I have implemented:</p>
  
  <pre><code>&lt;style name="MaterialTheme.Base" parent="Theme.AppCompat.Light.NoActionBar"&gt;
  </code></pre>