[expressions] add format for text field example

MapboxAndroidDemo/src/global/java/com/mapbox/mapboxandroiddemo/MainActivity.java

@@ -124,6 +124,7 @@
 import com.mapbox.mapboxandroiddemo.examples.styles.MapboxStudioStyleActivity;
 import com.mapbox.mapboxandroiddemo.examples.styles.ShowHideLayersActivity;
 import com.mapbox.mapboxandroiddemo.examples.styles.StyleFadeSwitchActivity;
+import com.mapbox.mapboxandroiddemo.examples.styles.TextFieldMultipleFormatsActivity;
 import com.mapbox.mapboxandroiddemo.examples.styles.TransparentBackgroundActivity;
 import com.mapbox.mapboxandroiddemo.examples.styles.VectorSourceActivity;
 import com.mapbox.mapboxandroiddemo.examples.styles.ZoomDependentFillColorActivity;
@@ -578,6 +579,14 @@ private void initializeModels() {
       null,
       R.string.activity_styles_fade_switch_url, false, BuildConfig.MIN_SDK_VERSION));
 
+    exampleItemModels.add(new ExampleItemModel(
+      R.id.nav_styles,
+      R.string.activity_styles_text_field_multiple_formats_title,
+      R.string.activity_styles_text_field_multiple_formats_description,
+      new Intent(MainActivity.this, TextFieldMultipleFormatsActivity.class),
+      null,
+      R.string.activity_styles_text_field_multiple_formats_url, false, BuildConfig.MIN_SDK_VERSION));
+
     exampleItemModels.add(new ExampleItemModel(
       R.id.nav_styles,
       R.string.activity_styles_transparent_background_title,

MapboxAndroidDemo/src/main/AndroidManifest.xml

@@ -396,6 +396,13 @@
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value="com.mapbox.mapboxandroiddemo.MainActivity" />
         </activity>
+        <activity
+            android:name=".examples.styles.TextFieldMultipleFormatsActivity"
+            android:label="@string/activity_styles_text_field_multiple_formats_title">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="com.mapbox.mapboxandroiddemo.MainActivity" />
+        </activity>
         <activity
             android:name=".examples.styles.ClickToAddImageActivity"
             android:label="@string/activity_styles_click_to_add_image_title">

MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/styles/TextFieldMultipleFormatsActivity.java

@@ -0,0 +1,116 @@
+package com.mapbox.mapboxandroiddemo.examples.styles;
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v7.app.AppCompatActivity;
+
+import com.mapbox.mapboxandroiddemo.R;
+import com.mapbox.mapboxsdk.Mapbox;
+import com.mapbox.mapboxsdk.maps.MapView;
+import com.mapbox.mapboxsdk.maps.MapboxMap;
+import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
+import com.mapbox.mapboxsdk.maps.Style;
+import com.mapbox.mapboxsdk.style.expressions.Expression;
+import com.mapbox.mapboxsdk.style.layers.Layer;
+
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textField;
+
+public class TextFieldMultipleFormatsActivity extends AppCompatActivity {
+
+  private MapView mapView;
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+
+    // Mapbox access token is configured here. This needs to be called either in your application
+    // object or in the same activity which contains the mapview.
+    Mapbox.getInstance(this, getString(R.string.access_token));
+
+    // This contains the MapView in XML and needs to be called after the access token is configured.
+    setContentView(R.layout.activity_style_text_field_multiple_formats);
+
+    mapView = findViewById(R.id.mapView);
+    mapView.onCreate(savedInstanceState);
+    mapView.getMapAsync(new OnMapReadyCallback() {
+      @Override
+      public void onMapReady(@NonNull MapboxMap mapboxMap) {
+        mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
+          @Override
+          public void onStyleLoaded(@NonNull final Style style) {
+
+            // Set up label formatting expression
+            Expression.FormatEntry bigLabel = Expression.formatEntry(
+              Expression.get("name_en"),
+              Expression.FormatOption.formatFontScale(1.5),
+              Expression.FormatOption.formatTextFont(new String[] {"Ubuntu Medium", "Arial Unicode MS Regular"})
+            );
+
+            Expression.FormatEntry newLine = Expression.formatEntry(
+              "\n",
+              Expression.FormatOption.formatFontScale(0.5)
+            );
+
+            Expression.FormatEntry smallLabel = Expression.formatEntry(
+              Expression.get("name"),
+              Expression.FormatOption.formatTextFont(new String[] {"Caveat Regular", "Arial Unicode MS Regular"})
+            );
+
+            Expression format = Expression.format(bigLabel, newLine, smallLabel);
+
+            // Retrieve the country label layers from the style and update them with the formatting expression
+            for (Layer mapLabelLayer : style.getLayers()) {
+              if (mapLabelLayer.getId().contains("country-label")) {
+                // apply formatting expression
+                mapLabelLayer.setProperties(textField(format));
+              }
+            }
+          }
+        });
+      }
+    });
+  }
+
+  // Add the mapView lifecycle to the activity's lifecycle methods
+  @Override
+  public void onResume() {
+    super.onResume();
+    mapView.onResume();
+  }
+
+  @Override
+  protected void onStart() {
+    super.onStart();
+    mapView.onStart();
+  }
+
+  @Override
+  protected void onStop() {
+    super.onStop();
+    mapView.onStop();
+  }
+
+  @Override
+  public void onPause() {
+    super.onPause();
+    mapView.onPause();
+  }
+
+  @Override
+  public void onLowMemory() {
+    super.onLowMemory();
+    mapView.onLowMemory();
+  }
+
+  @Override
+  protected void onDestroy() {
+    super.onDestroy();
+    mapView.onDestroy();
+  }
+
+  @Override
+  protected void onSaveInstanceState(Bundle outState) {
+    super.onSaveInstanceState(outState);
+    mapView.onSaveInstanceState(outState);
+  }
+}

MapboxAndroidDemo/src/main/res/layout/activity_style_text_field_multiple_formats.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:mapbox="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".examples.styles.TextFieldMultipleFormatsActivity">
+
+    <com.mapbox.mapboxsdk.maps.MapView
+        android:id="@+id/mapView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        mapbox:mapbox_cameraTargetLat="48.4"
+        mapbox:mapbox_cameraTargetLng="18.49"
+        mapbox:mapbox_cameraZoom="4.5" />
+
+</RelativeLayout>

MapboxAndroidDemo/src/main/res/values/descriptions_strings.xml

@@ -30,6 +30,7 @@
     <string name="activity_style_image_source_description">Use an image source to easily display images on the map.</string>
     <string name="activity_style_hillshade_description">Use elevation data to show and customize hills and mountains.</string>
     <string name="activity_styles_fade_switch_description">Fade map styles in and out based on zoom level.</string>
+    <string name="activity_styles_text_field_multiple_formats_description">Use a format expression to style labels in multiple ways.</string>
     <string name="activity_styles_transparent_background_description">Create a transparent background and fill it with something such as moving water.</string>
     <string name="activity_styles_click_to_add_image_description">Select a photo on the device and add it on the map tap location.</string>
     <string name="activity_extrusions_catalina_marathon_extrusions_description">Use data-driven styling and GeoJSON data to set extrusions\' heights.</string>

MapboxAndroidDemo/src/main/res/values/titles_strings.xml

@@ -27,6 +27,7 @@
     <string name="activity_style_image_source_title">Use an image source</string>
     <string name="activity_styles_hillshade_title">Hillshading</string>
     <string name="activity_styles_fade_switch_title">Switch map styles with fade</string>
+    <string name="activity_styles_text_field_multiple_formats_title">Multiple text formats</string>
     <string name="activity_styles_transparent_background_title">Transparent render surface</string>
     <string name="activity_styles_click_to_add_image_title">Click to add photo</string>
     <string name="activity_extrusions_catalina_marathon_extrusions_title">Use GeoJSON data to set extrusion height</string>

MapboxAndroidDemo/src/main/res/values/urls_strings.xml

@@ -29,6 +29,7 @@
     <string name="activity_style_image_source_url" translatable="false">https://i.imgur.com/I6B6cCE.png</string>
     <string name="activity_style_hillshade_url" translatable="false">https://i.imgur.com/U2OKixV.png</string>
     <string name="activity_styles_fade_switch_url" translatable="false">https://i.imgur.com/1sPnDx5.png</string>
+    <string name="activity_styles_text_field_multiple_formats_url" translatable="false">https://i.imgur.com/OIbBFI5.png</string>
     <string name="activity_styles_transparent_background_url" translatable="false">https://i.imgur.com/5bYnlp5.png</string>
     <string name="activity_styles_click_to_add_image_url" translatable="false">https://i.imgur.com/uPIH5Ck.png</string>
     <string name="activity_extrusions_population_density_extrusions_url" translatable="false">http://i.imgur.com/se1z8Wb.png</string>