From b61d9643ee31887a1792684676248c0b3c27da4d Mon Sep 17 00:00:00 2001
From: tobrun <tobrun.van.nuland@gmail.com>
Date: Mon, 13 Aug 2018 11:40:54 +0200
Subject: [android] - add line-gradient example, integrate lineProgress
 expression

---
 .../mapboxsdk/style/expressions/Expression.java    |  10 ++
 .../mapboxsdk/style/sources/GeoJsonOptions.java    |   7 ++
 .../src/main/AndroidManifest.xml                   |  11 ++
 .../activity/style/GradientLineActivity.java       | 117 +++++++++++++++++++++
 .../src/main/res/layout/activity_gradient_line.xml |  11 ++
 .../res/raw/test_line_gradient_feature.geojson     |  38 +++++++
 .../src/main/res/values/descriptions.xml           |   1 +
 .../src/main/res/values/titles.xml                 |   1 +
 8 files changed, 196 insertions(+)
 create mode 100644 platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/GradientLineActivity.java
 create mode 100644 platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_gradient_line.xml
 create mode 100644 platform/android/MapboxGLAndroidSDKTestApp/src/main/res/raw/test_line_gradient_feature.geojson

diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/expressions/Expression.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/expressions/Expression.java
index 1aa0ce9093..67fe9e6e0b 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/expressions/Expression.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/expressions/Expression.java
@@ -1143,6 +1143,16 @@ public class Expression {
     return new Expression("heatmap-density");
   }
 
+  /**
+   * Gets the progress along a gradient line. Can only be used in the line-gradient property.
+   *
+   * @return expression
+   * @see <a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-line-progress">Style specification</a>
+   */
+  public static Expression lineProgress() {
+    return new Expression("line-progress");
+  }
+
   /**
    * Retrieves an item from an array.
    *
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/GeoJsonOptions.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/GeoJsonOptions.java
index 79cde7429c..707c7c43a7 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/GeoJsonOptions.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/GeoJsonOptions.java
@@ -89,4 +89,11 @@ public class GeoJsonOptions extends HashMap<String, Object> {
     return this;
   }
 
+  /**
+   *
+   */
+  public GeoJsonOptions withLineMetrics(boolean lineMetrics) {
+    this.put("lineMetrics", lineMetrics);
+    return this;
+  }
 }
diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml b/platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml
index c87e9d09bf..e23b1d64f3 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml
@@ -432,6 +432,17 @@
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value=".activity.FeatureOverviewActivity" />
         </activity>
+        <activity
+                android:name=".activity.style.GradientLineActivity"
+                android:description="@string/description_gradient_line"
+                android:label="@string/activity_gradient_line">
+            <meta-data
+                    android:name="@string/category"
+                    android:value="@string/category_style" />
+            <meta-data
+                    android:name="android.support.PARENT_ACTIVITY"
+                    android:value=".activity.FeatureOverviewActivity" />
+        </activity>
         <activity
             android:name=".activity.style.DataDrivenStyleActivity"
             android:description="@string/description_data_driven_style"
diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/GradientLineActivity.java b/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/GradientLineActivity.java
new file mode 100644
index 0000000000..45dd29354d
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/GradientLineActivity.java
@@ -0,0 +1,117 @@
+package com.mapbox.mapboxsdk.testapp.activity.style;
+
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import com.mapbox.mapboxsdk.maps.MapView;
+import com.mapbox.mapboxsdk.maps.MapboxMap;
+import com.mapbox.mapboxsdk.style.expressions.Expression;
+import com.mapbox.mapboxsdk.style.layers.LineLayer;
+import com.mapbox.mapboxsdk.style.layers.Property;
+import com.mapbox.mapboxsdk.style.sources.GeoJsonOptions;
+import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
+import com.mapbox.mapboxsdk.testapp.R;
+import com.mapbox.mapboxsdk.testapp.utils.ResourceUtils;
+import timber.log.Timber;
+
+import java.io.IOException;
+
+import static com.mapbox.mapboxsdk.style.expressions.Expression.interpolate;
+import static com.mapbox.mapboxsdk.style.expressions.Expression.lineProgress;
+import static com.mapbox.mapboxsdk.style.expressions.Expression.linear;
+import static com.mapbox.mapboxsdk.style.expressions.Expression.rgb;
+import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
+import static com.mapbox.mapboxsdk.style.layers.Property.LINE_CAP_ROUND;
+import static com.mapbox.mapboxsdk.style.layers.Property.LINE_JOIN_ROUND;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineCap;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineColor;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineGradient;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineJoin;
+import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineWidth;
+
+public class GradientLineActivity extends AppCompatActivity {
+
+  public static final String ID_LINE_SOURCE = "gradient";
+  private MapboxMap mapboxMap;
+  private MapView mapView;
+
+  @Override
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_gradient_line);
+
+    mapView = findViewById(R.id.mapView);
+    mapView.onCreate(savedInstanceState);
+    mapView.getMapAsync(map -> {
+      mapboxMap = map;
+
+      try {
+        String geoJson = ResourceUtils.readRawResource(GradientLineActivity.this, R.raw.test_line_gradient_feature);
+        GeoJsonSource source = new GeoJsonSource(ID_LINE_SOURCE, geoJson, new GeoJsonOptions().withLineMetrics(true));
+        mapboxMap.addSource(source);
+
+        Expression lineGradientExpression = interpolate(
+          linear(), lineProgress(),
+          stop(0f, rgb(0, 0, 255)),
+          stop(0.5f, rgb(0, 255, 0)),
+          stop(1f, rgb(255, 0, 0))
+        );
+
+        LineLayer layer = new LineLayer("gradient", ID_LINE_SOURCE)
+          .withProperties(
+            lineColor(Color.RED),
+            lineWidth(10.0f),
+            lineGradient(lineGradientExpression),
+            lineCap(LINE_CAP_ROUND),
+            lineJoin(LINE_JOIN_ROUND)
+          );
+
+        mapboxMap.addLayer(layer);
+      } catch (IOException exception) {
+        Timber.e(exception);
+      }
+    });
+  }
+
+  @Override
+  protected void onStart() {
+    super.onStart();
+    mapView.onStart();
+  }
+
+  @Override
+  protected void onResume() {
+    super.onResume();
+    mapView.onResume();
+  }
+
+  @Override
+  protected void onPause() {
+    super.onPause();
+    mapView.onPause();
+  }
+
+  @Override
+  protected void onStop() {
+    super.onStop();
+    mapView.onStop();
+  }
+
+  @Override
+  public void onSaveInstanceState(Bundle outState) {
+    super.onSaveInstanceState(outState);
+    mapView.onSaveInstanceState(outState);
+  }
+
+  @Override
+  public void onLowMemory() {
+    super.onLowMemory();
+    mapView.onLowMemory();
+  }
+
+  @Override
+  public void onDestroy() {
+    super.onDestroy();
+    mapView.onDestroy();
+  }
+}
diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_gradient_line.xml b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_gradient_line.xml
new file mode 100644
index 0000000000..e5db4b63df
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_gradient_line.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.mapbox.mapboxsdk.maps.MapView
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:id="@id/mapView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:mapbox_cameraTargetLat="45.38301927899065"
+        app:mapbox_cameraTargetLng="8.63525390625"
+        app:mapbox_cameraZoom="7"
+        app:mapbox_styleUrl="@string/mapbox_style_mapbox_streets"/>
diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/raw/test_line_gradient_feature.geojson b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/raw/test_line_gradient_feature.geojson
new file mode 100644
index 0000000000..3525259cba
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/raw/test_line_gradient_feature.geojson
@@ -0,0 +1,38 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "LineString",
+        "coordinates": [
+          [
+            9.38507080078125,
+            46.16936992120204
+          ],
+          [
+            9.07196044921875,
+            45.81540082150529
+          ],
+          [
+            9.3878173828125,
+            45.85271700071619
+          ],
+          [
+            9.2010498046875,
+            45.46783598133375
+          ],
+          [
+            8.876953125,
+            44.422011314236634
+          ],
+          [
+            7.635498046875,
+            45.07352060670971
+          ]
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/descriptions.xml b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/descriptions.xml
index bb4e0cfe6d..6c68edc4d2 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/descriptions.xml
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/descriptions.xml
@@ -29,6 +29,7 @@
     <string name="description_dynamic_info_window_adapter">Learn how to create a dynamic custom InfoWindow</string>
     <string name="description_viewpager">Use SupportMapFragments in a ViewPager</string>
     <string name="description_runtime_style">Adopt the map style on the fly</string>
+    <string name="description_gradient_line">Show a gradient line layer from a geojson source</string>
     <string name="description_data_driven_style">Use functions to change the map appearance</string>
     <string name="description_symbol_layer">Manipulate symbols at runtime</string>
     <string name="description_custom_sprite">Use a custom sprite in a Symbol Layer</string>
diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/titles.xml b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/titles.xml
index 736c33fe34..ddf3518863 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/titles.xml
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/titles.xml
@@ -30,6 +30,7 @@
     <string name="activity_minmax_zoom">Min/Max Zoom</string>
     <string name="activity_viewpager">ViewPager</string>
     <string name="activity_runtime_style">Runtime Style</string>
+    <string name="activity_gradient_line">Gradient line layer</string>
     <string name="activity_data_driven_style">Data Driven Style</string>
     <string name="activity_circle_layer">Circle layer</string>
     <string name="activity_style_file">Local Style file</string>
-- 
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