parsed coordinates from geojson, ready to add polyline via JNI #1716

android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/MainActivity.java

@@ -1,6 +1,7 @@
 package com.mapbox.mapboxgl.testapp;
 
 import android.content.Context;
+import android.graphics.Color;
 import android.graphics.Matrix;
 import android.graphics.PointF;
 import android.hardware.GeomagneticField;
@@ -25,6 +26,8 @@ import android.widget.TextView;
 
 import com.mapbox.mapboxgl.annotations.Marker;
 import com.mapbox.mapboxgl.annotations.MarkerOptions;
+import com.mapbox.mapboxgl.annotations.Polyline;
+import com.mapbox.mapboxgl.annotations.PolylineOptions;
 import com.mapbox.mapboxgl.geometry.LatLng;
 import com.mapbox.mapboxgl.views.MapView;
 import com.mapzen.android.lost.api.LocationListener;
@@ -32,6 +35,9 @@ import com.mapzen.android.lost.api.LocationRequest;
 import com.mapzen.android.lost.api.LocationServices;
 import com.mapzen.android.lost.api.LostApiClient;
 
+import org.json.JSONException;
+
+import java.io.IOException;
 import java.util.ArrayList;
 
 public class MainActivity extends ActionBarActivity {
@@ -270,6 +276,7 @@ public class MainActivity extends ActionBarActivity {
             if (!mIsMarkersOn) {
                 mIsMarkersOn = true;
                 addMarkers();
+                addPolyline();
             }
         } else {
             if (mIsMarkersOn) {
@@ -288,6 +295,22 @@ public class MainActivity extends ActionBarActivity {
             .snippet("The back lot behind my house"));
     }
 
+    private void addPolyline() {
+        try {
+            String geojsonStr = Util.loadStringFromAssets(this, "tillicum.geojson");
+            LatLng[] latLngs = Util.parseGeoJSONCoordinates(geojsonStr);
+            MapView map = mMapFragment.getMap();
+//            Polyline line = map.addPolyline(new PolylineOptions()
+//                    .add(new LatLng(51.5, -0.1), new LatLng(40.7, -74.0))
+//                    .width(5)
+//                    .color(Color.RED));
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (JSONException e) {
+            e.printStackTrace();
+        }
+    }
+
     private void removeMarkers() {
         marker.remove();
     }

android/java/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxgl/testapp/Util.java

@@ -0,0 +1,53 @@
+package com.mapbox.mapboxgl.testapp;
+
+import android.content.Context;
+import android.text.TextUtils;
+
+import com.mapbox.mapboxgl.geometry.LatLng;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.Charset;
+
+public class Util {
+
+    public static String loadStringFromAssets(final Context context, final String fileName) throws IOException {
+        if (TextUtils.isEmpty(fileName)) {
+            throw new NullPointerException("No GeoJSON File Name passed in.");
+        }
+        InputStream is = context.getAssets().open(fileName);
+        BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
+        return readAll(rd);
+    }
+
+    public static LatLng[] parseGeoJSONCoordinates(String geojsonStr) throws JSONException {
+        JSONObject jsonObject = new JSONObject(geojsonStr);
+        JSONObject geometry = jsonObject.getJSONObject("geometry");
+        JSONArray coordinates = geometry.getJSONArray("coordinates");
+        int len = coordinates.length();
+        LatLng[] latLngs = new LatLng[coordinates.length()];
+        for (int i = 0; i < len; ++i) {
+            JSONArray coord = coordinates.getJSONArray(i);
+            double lng = coord.getDouble(0);
+            double lat = coord.getDouble(1);
+            latLngs[i] = new LatLng(lat, lng);
+        }
+        return latLngs;
+    }
+
+    private static String readAll(Reader rd) throws IOException {
+        StringBuilder sb = new StringBuilder();
+        int cp;
+        while ((cp = rd.read()) != -1) {
+            sb.append((char) cp);
+        }
+        return sb.toString();
+    }
+}