title: Changing android nav bar title in xamarin.forms project
body: <p>I try to change android nav bar title of my xamarin forms project</p>
  
  <p>I can't do that im app.xaml because when i change the color in pcl it changes ios back button too, And I don't wanna it...then I have already tried:</p>
  
  <pre><code>&lt;resources&gt;
   &lt;style name="MyTheme" parent="@android:style/Theme.Holo.Light"&gt;
  &lt;item name="android:actionBarStyle"&gt;@style/MyTheme.ActionBarStyle&lt;/item&gt;
  &lt;/style&gt;
  
   &lt;style name="MyTheme.ActionBarStyle" 
   parent="@android:style/Widget.Holo.Light.ActionBar"&gt;
    &lt;item 
  name="android:titleTextStyle"&gt;@style/MyTheme.ActionBar.TitleTextStyle&lt;/item&gt;
    &lt;/style&gt;
  
    &lt;style name="MyTheme.ActionBar.TitleTextStyle" 
  parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Title"&gt;
      &lt;item name="android:textColor"&gt;#f08080&lt;/item&gt;
   &lt;/style&gt;
  </code></pre>
  
  <p></p>
  
  <p>I read that I need to put something in the manifest but I Didn't found how to do that...</p>
  
  <p>no error and nothing change...</p>
  
  <p>My 'MainActivity':</p>
  
  <pre><code>namespace neoFly_Montana.Droid
  {
  
  [Activity(Label = "neoFly_Montana", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = false, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
  public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
  {
      public static Context AppContext;
      protected override void OnCreate(Bundle bundle)
      {
          TabLayoutResource = Resource.Layout.Tabbar;
          ToolbarResource = Resource.Layout.Toolbar;
  
          base.OnCreate(bundle);
  
          global::Xamarin.Forms.Forms.Init(this, bundle);
  
          //qrcode inicializa
          ZXing.Net.Mobile.Forms.Android.Platform.Init();
  
          //inicializa imageCircle
          ImageCircleRenderer.Init();
  
          //inicializa o mapa
          global::Xamarin.FormsMaps.Init(this, bundle);
  
          //shared Preferences
          App.Init(new AndroidUserPreferences());
  
          //Gerenciador de memória
          CachedImageRenderer.Init();
  
          //AndroidUserPreferences sharedPref = new AndroidUserPreferences();
          //var token = FirebaseInstanceId.Instance.Token;
          //sharedPref.SetString("token", token); joyce descomentar
  
          LoadApplication(new App());
      }
  
      // Field, property, and method for Picture Picker
      public static readonly int PickImageId = 1000;
  
      public TaskCompletionSource&lt;Stream&gt; PickImageTaskCompletionSource { set; get; 
   }
  
      protected override void OnActivityResult(int requestCode, Result resultCode, Intent intent)
      {
          base.OnActivityResult(requestCode, resultCode, intent);
  
          if (requestCode == PickImageId)
          {
              if ((resultCode == Result.Ok) &amp;&amp; (intent != null))
              {
                  Android.Net.Uri uri = intent.Data;
                  Stream stream = ContentResolver.OpenInputStream(uri);
  
                  // Set the Stream as the completion of the Task
                  PickImageTaskCompletionSource.SetResult(stream);
              }
              else
              {
                  PickImageTaskCompletionSource.SetResult(null);
              }
          }
      }
  
      //qrcode permission
      public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
      {
          global::ZXing.Net.Mobile.Forms.Android.PermissionsHandler.OnRequestPermissionsResult(requestCode, permissions, grantResults);
      }    
  
  }
  }
  </code></pre>
  
  <p>If I change the theme to MyTheme this exception ocures:</p>
  
  <blockquote>
    <p>Unhandled Exception: Java.Lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. </p>
  </blockquote>