title: Google Map isn't zooming in and out with a custom button
body: <p>I made custom buttons for zooming in and out. This is the XML for buttons:</p>
  
  <pre><code>&lt;ImageButton
      android:id="@+id/unzoomButton"
      android:layout_width="58dp"
      android:layout_height="58dp"
      android:layout_alignParentBottom="true"
      android:layout_centerHorizontal="true"
      android:background="@drawable/unzoom_button"
      android:layout_marginTop="@dimen/standard_margin"
      android:layout_marginBottom="@dimen/standard_margin"
      android:scaleType="fitXY" /&gt;
  
  &lt;ImageButton
      android:id="@+id/zoomButton"
      android:layout_width="58dp"
      android:layout_height="58dp"
      android:layout_alignTop="@+id/unzoomButton"
      android:layout_toRightOf="@+id/unzoomButton"
      android:background="@drawable/zoom_button"
      android:scaleType="fitXY" /&gt;
  </code></pre>
  
  <p>Adding ImageButton listeners:</p>
  
  <pre><code>    imgbtnZoom = (ImageButton) findViewById(R.id.zoomButton);
      imgbtnZoom.setOnClickListener(this);
  
      imgbtnUnzoom = (ImageButton) findViewById(R.id.unzoomButton);
      imgbtnUnzoom.setOnClickListener(this);
  </code></pre>
  
  <p>And for statement that shozuld handles clicks:</p>
  
  <pre><code>@Override
  public void onClick(View v) {
  
      switch (v.getId()) {
      case R.id.button_options:
          Intent i = new Intent();
          i.setClass(this, OptionsActivity.class);
          startActivityForResult(i, OptionsActivity.REQUEST_CODE_OPTIONS_ACTIVITY);
          break;
      case R.id.button_back:
          finish();
          break;
      case R.id.zoomButton:
          CameraUpdateFactory.zoomIn();
          Log.i("TAG", "Zoom in");
          break;
      case R.id.unzoomButton:
          CameraUpdateFactory.zoomOut();
          Log.i("TAG", "Zoom out");
          break;
      }
  }
  </code></pre>
  
  <p>I even added log to those two clicks to make sure the button click actually works (and it does), but nothing happens with the map when I click either of those buttons.</p>
  
  <blockquote>
    <p>CameraUpdateFactory.zoomIn() and CameraUpdateFactory.zoomOut() give you a CameraUpdate that changes the zoom level by 1.0, while keeping all other properties the same.</p>
  </blockquote>
  
  <p>Google Maps API official documentation clearly states that using either of those two functions should zoom in/out google maps. It doesn't say that there should be anything else done for it to work. Am I missing something?</p>