[android] - expose setStyleJson and getStyleJson

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapView.java

@@ -581,7 +581,7 @@ void onMapChange(int rawChange) {
       try {
         onMapChangedListener.onMapChanged(rawChange);
       } catch (RuntimeException err) {
-        Timber.e("Exception (%s) in MapView.OnMapChangedListener: %s", err.getClass(), err.getMessage());
+        Timber.e(err, "Exception in MapView.OnMapChangedListener");
       }
     }
   }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapboxMap.java

@@ -1134,7 +1134,7 @@ private void setStyleUrl(@NonNull MapboxMapOptions options) {
   }
 
   /**
-   * Returns the map style currently displayed in the map view.
+   * Returns the map style url currently displayed in the map view.
    *
    * @return The URL of the map style
    */
@@ -1144,6 +1144,27 @@ public String getStyleUrl() {
     return nativeMapView.getStyleUrl();
   }
 
+  /**
+   * Loads a new map style from a json string.
+   * <p>
+   * If the style fails to load or an invalid style URL is set, the map view will become blank.
+   * An error message will be logged in the Android logcat and {@link MapView#DID_FAIL_LOADING_MAP} event will be
+   * sent.
+   * </p>
+   */
+  public void setStyleJson(@NonNull String styleJson) {
+    nativeMapView.setStyleJson(styleJson);
+  }
+
+  /**
+   * Returns the map style json currently displayed in the map view.
+   *
+   * @return The json of the map style
+   */
+  public String getStyleJson() {
+    return nativeMapView.getStyleJson();
+  }
+
   //
   // Annotations
   //

platform/android/MapboxGLAndroidSDKTestApp/src/main/AndroidManifest.xml

@@ -687,7 +687,7 @@
                   android:label="@string/activity_bottom_sheet">
             <meta-data
                 android:name="@string/category"
-                android:value="@string/category_basic"/>
+                android:value="@string/category_maplayout"/>
         </activity>
 
         <!-- For Instrumentation tests -->

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/maplayout/DebugModeActivity.java

@@ -41,10 +41,18 @@ protected void onCreate(Bundle savedInstanceState) {
     setContentView(R.layout.activity_debug_mode);
 
     mapView = (MapView) findViewById(R.id.mapView);
+    mapView.addOnMapChangedListener(new MapView.OnMapChangedListener() {
+      @Override
+      public void onMapChanged(int change) {
+        if (change == MapView.DID_FINISH_LOADING_STYLE && mapboxMap != null) {
+          Timber.e("New loaded style = %s", mapboxMap.getStyleJson());
+        }
+      }
+    });
+
     mapView.setTag(true);
     mapView.setStyleUrl(STYLES[currentStyleIndex]);
     mapView.onCreate(savedInstanceState);
-
     mapView.getMapAsync(new OnMapReadyCallback() {
       @Override
       public void onMapReady(@NonNull MapboxMap map) {
@@ -63,13 +71,12 @@ public void onCameraChange(CameraPosition position) {
       }
     });
 
-
     FloatingActionButton fabDebug = (FloatingActionButton) findViewById(R.id.fabDebug);
     fabDebug.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View view) {
         if (mapboxMap != null) {
-          Timber.d("Debug FAB: isDebug Active? %s" , mapboxMap.isDebugActive());
+          Timber.d("Debug FAB: isDebug Active? %s", mapboxMap.isDebugActive());
           mapboxMap.cycleDebugOptions();
         }
       }

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/StyleFileActivity.java

@@ -1,5 +1,6 @@
 package com.mapbox.mapboxsdk.testapp.activity.style;
 
+import android.content.Context;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
@@ -25,11 +26,12 @@
 import java.io.Reader;
 import java.io.StringWriter;
 import java.io.Writer;
+import java.lang.ref.WeakReference;
 
 import timber.log.Timber;
 
 /**
- * Test activity showcasing how to use a file:// resource for the style.json
+ * Test activity showcasing how to use a file:// resource for the style.json and how to use MapboxMap#setStyleJson.
  */
 public class StyleFileActivity extends AppCompatActivity {
 
@@ -48,58 +50,96 @@ public void onCreate(Bundle savedInstanceState) {
       public void onMapReady(@NonNull final MapboxMap map) {
         mapboxMap = map;
 
-        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
+        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab_file);
         fab.setColorFilter(ContextCompat.getColor(StyleFileActivity.this, R.color.primary));
         fab.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
-            Timber.i("Loading style file");
-            new CreateStyleFileTask().execute();
+            new CreateStyleFileTask(view.getContext(), mapboxMap).execute();
+          }
+        });
+
+        FloatingActionButton fabStyleJson = (FloatingActionButton) findViewById(R.id.fab_style_json);
+        fabStyleJson.setColorFilter(ContextCompat.getColor(StyleFileActivity.this, R.color.primary));
+        fabStyleJson.setOnClickListener(new View.OnClickListener() {
+          @Override
+          public void onClick(View view) {
+            new LoadStyleFileTask(view.getContext(), mapboxMap).execute();
           }
         });
       }
     });
   }
 
+  /**
+   * Task to read a style file from the raw folder
+   */
+  private static class LoadStyleFileTask extends AsyncTask<Void, Void, String> {
+    private WeakReference<Context> context;
+    private WeakReference<MapboxMap> mapboxMap;
+
+    LoadStyleFileTask(Context context, MapboxMap mapboxMap) {
+      this.context = new WeakReference<>(context);
+      this.mapboxMap = new WeakReference<>(mapboxMap);
+    }
+
+    @Override
+    protected String doInBackground(Void... voids) {
+      String styleJson = "";
+      try {
+        styleJson = RawResourceReaderWriter.readRawResource(context.get(), R.raw.sat_style);
+      } catch (Exception exception) {
+        Timber.e(exception, "Can't load local file style");
+      }
+      return styleJson;
+    }
+
+    @Override
+    protected void onPostExecute(String json) {
+      super.onPostExecute(json);
+      Timber.d("Read json, %s", json);
+      MapboxMap mapboxMap = this.mapboxMap.get();
+      if (mapboxMap != null) {
+        mapboxMap.setStyleJson(json);
+      }
+    }
+  }
+
   /**
    * Task to write a style file to local disk and load it in the map view
    */
-  private class CreateStyleFileTask extends AsyncTask<Void, Integer, Long> {
+  private static class CreateStyleFileTask extends AsyncTask<Void, Integer, Long> {
     private File cacheStyleFile;
+    private WeakReference<Context> context;
+    private WeakReference<MapboxMap> mapboxMap;
+
+    CreateStyleFileTask(Context context, MapboxMap mapboxMap) {
+      this.context = new WeakReference<>(context);
+      this.mapboxMap = new WeakReference<>(mapboxMap);
+    }
 
     @Override
     protected Long doInBackground(Void... params) {
       try {
         cacheStyleFile = File.createTempFile("my-", ".style.json");
         cacheStyleFile.createNewFile();
         Timber.i("Writing style file to: %s", cacheStyleFile.getAbsolutePath());
-        writeToFile(cacheStyleFile, readRawResource(R.raw.local_style));
+        Context context = this.context.get();
+        if (context != null) {
+          writeToFile(cacheStyleFile, RawResourceReaderWriter.readRawResource(context, R.raw.local_style));
+        }
       } catch (Exception exception) {
-        Toast.makeText(StyleFileActivity.this, "Could not create style file in cache dir", Toast.LENGTH_SHORT).show();
+        Toast.makeText(context.get(), "Could not create style file in cache dir", Toast.LENGTH_SHORT).show();
       }
       return 1L;
     }
 
     protected void onPostExecute(Long result) {
       // Actual file:// usage
-      mapboxMap.setStyleUrl("file://" + cacheStyleFile.getAbsolutePath());
-    }
-
-    private String readRawResource(@RawRes int rawResource) throws IOException {
-      InputStream is = getResources().openRawResource(rawResource);
-      Writer writer = new StringWriter();
-      char[] buffer = new char[1024];
-      try {
-        Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
-        int numRead;
-        while ((numRead = reader.read(buffer)) != -1) {
-          writer.write(buffer, 0, numRead);
-        }
-      } finally {
-        is.close();
+      MapboxMap mapboxMap = this.mapboxMap.get();
+      if (mapboxMap != null) {
+        mapboxMap.setStyleUrl("file://" + cacheStyleFile.getAbsolutePath());
       }
-
-      return writer.toString();
     }
 
     private void writeToFile(File file, String contents) throws IOException {
@@ -115,6 +155,28 @@ private void writeToFile(File file, String contents) throws IOException {
     }
   }
 
+  static class RawResourceReaderWriter {
+    static String readRawResource(Context context, @RawRes int rawResource) throws IOException {
+      String json = "";
+      if (context != null) {
+        InputStream is = context.getResources().openRawResource(rawResource);
+        Writer writer = new StringWriter();
+        char[] buffer = new char[1024];
+        try {
+          Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
+          int numRead;
+          while ((numRead = reader.read(buffer)) != -1) {
+            writer.write(buffer, 0, numRead);
+          }
+        } finally {
+          is.close();
+        }
+        json = writer.toString();
+      }
+      return json;
+    }
+  }
+
   @Override
   protected void onStart() {
     super.onStart();

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_style_file.xml

@@ -15,7 +15,18 @@
         app:mapbox_styleUrl="@string/mapbox_style_mapbox_streets"/>
 
     <android.support.design.widget.FloatingActionButton
-        android:id="@id/fab"
+        android:id="@+id/fab_style_json"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:layout_above="@+id/fab_file"
+        android:layout_margin="@dimen/fab_margin"
+        android:src="@drawable/ic_add"
+        app:backgroundTint="@android:color/white"/>
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@id/fab_file"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/raw/sat_style.json

@@ -0,0 +1,31 @@
+{
+  "version": 8,
+  "name": "Satellite",
+  "metadata": {
+    "mapbox:autocomposite": true
+  },
+  "sources": {
+    "mapbox": {
+      "type": "raster",
+      "url": "mapbox://mapbox.satellite",
+      "tileSize": 256
+    }
+  },
+  "sprite": "mapbox://sprites/mapbox/satellite-v8",
+  "glyphs": "mapbox://fonts/mapbox/{fontstack}/{range}.pbf",
+  "layers": [
+    {
+      "id": "background",
+      "type": "background",
+      "paint": {
+        "background-color": "rgb(4,7,14)"
+      }
+    },
+    {
+      "id": "satellite",
+      "type": "raster",
+      "source": "mapbox",
+      "source-layer": "mapbox_satellite_full"
+    }
+  ]
+}

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/values/strings.xml

@@ -187,8 +187,8 @@
     <string name="dynamic_marker_chelsea_snippet">Stamford Bridge</string>
     <string name="dynamic_marker_arsenal_title">Arsenal</string>
     <string name="dynamic_marker_arsenal_snippet">Emirates Stadium</string>
-    <string name="debug_zoom">Zoom: %d</string>
-    <string name="viewcache_size">"ViewCache size %d"</string>
+    <string name="debug_zoom">Zoom: %.2f</string>
+    <string name="viewcache_size">ViewCache size %.2f</string>
     <string name="latitude">Latitude</string>
     <string name="min_value">-180</string>
     <string name="longitude">Longitude</string>