[android] #3244 - Adding support for Callbacks using MapChange events.

android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/views/MapView.java

@@ -1515,9 +1515,32 @@ public final void animateCamera (CameraUpdate update, MapView.CancelableCallback
      * @param durationMs The duration of the animation in milliseconds. This must be strictly positive, otherwise an IllegalArgumentException will be thrown.
      * @param callback An optional callback to be notified from the main thread when the animation stops. If the animation stops due to its natural completion, the callback will be notified with onFinish(). If the animation stops due to interruption by a later camera movement or a user gesture, onCancel() will be called. The callback should not attempt to move or animate the camera in its cancellation method. If a callback isn't required, leave it as null.
      */
-    public final void animateCamera (CameraUpdate update, int durationMs, MapView.CancelableCallback callback) {
+    public final void animateCamera (CameraUpdate update, int durationMs, final MapView.CancelableCallback callback) {
 
         mNativeMapView.cancelTransitions();
+
+        // Register callbacks early enough
+        if (callback != null) {
+            final MapView view = this;
+            addOnMapChangedListener(new OnMapChangedListener() {
+                @Override
+                public void onMapChanged(@MapChange int change) {
+                    if (change == REGION_DID_CHANGE_ANIMATED || change == REGION_DID_CHANGE) {
+                        // Invoke callback on UI Thread
+                        view.post(new Runnable() {
+                            @Override
+                            public void run() {
+                                callback.onFinish();
+                            }
+                        });
+
+                        // Clean up after self
+                        removeOnMapChangedListener(this);
+                    }
+                }
+            });
+        }
+
         // Convert Degrees To Radians
         double angle = -1;
         if (update.getBearing() >= 0) {
@@ -1543,13 +1566,6 @@ public final void animateCamera (CameraUpdate update, int durationMs, MapView.Ca
             Log.i(TAG, "flyTo() called with angle = " + angle + "; target = " + update.getTarget() + "; durationNano = " + durationNano + "; Pitch = " + pitch + "; Zoom = " + update.getZoom());
             flyTo(angle, update.getTarget(), durationNano, pitch, update.getZoom());
         }
-
-/*
-        // Not implemented yet
-        if (callback != null) {
-            callback.onFinish();
-        }
-*/
     }
 
     //

android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/CameraActivity.java

@@ -5,6 +5,7 @@
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.util.Log;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
@@ -18,6 +19,8 @@
 
 public class CameraActivity extends AppCompatActivity {
 
+    private static final String TAG = "CameraActivity";
+
     private MapView mMapView;
 
     @Override
@@ -70,12 +73,12 @@ public void onClick(View view) {
                     @Override
                     public void onCancel() {
                         // NOTE: This shouldn't appear
-                        Toast.makeText(getApplicationContext(), "onCancel Callback called.", Toast.LENGTH_SHORT).show();
+                        Log.i(TAG, "onCancel Callback called.");
                     }
 
                     @Override
                     public void onFinish() {
-                        Toast.makeText(getApplicationContext(), "onFinish Callback called.", Toast.LENGTH_SHORT).show();
+                        Log.i(TAG, "onFinish Callback called.");
                     }
                 };
 
@@ -99,12 +102,12 @@ public void onClick(View view) {
                 MapView.CancelableCallback callback = new MapView.CancelableCallback() {
                     @Override
                     public void onCancel() {
-                        Toast.makeText(getApplicationContext(), "Duration onCancel Callback called.", Toast.LENGTH_SHORT).show();
+                        Log.i(TAG, "Duration onCancel Callback called.");
                     }
 
                     @Override
                     public void onFinish() {
-                        Toast.makeText(getApplicationContext(), "Duration onFinish Callback called.", Toast.LENGTH_SHORT).show();
+                        Log.i(TAG, "Duration onFinish Callback called.");
                     }
                 };