[android] Fix the crash when CameraPosition padding is set. (#15699)

* [android] Add test branch, navigate to Map Snapshotter activity to reproduce the bug.

* [android] Fix the crash when camera position padding is set.

2 files changed, 12 insertions, 10 deletions

diff --git a/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/snapshot/MapSnapshotterActivity.java b/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/snapshot/MapSnapshotterActivity.java
index 59c708266e..ab7ffed83e 100644
--- a/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/snapshot/MapSnapshotterActivity.java
+++ b/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/snapshot/MapSnapshotterActivity.java
@@ -89,6 +89,7 @@ public class MapSnapshotterActivity extends AppCompatActivity {
         .bearing(randomInRange(0, 360))
         .tilt(randomInRange(0, 60))
         .zoom(randomInRange(0, 20))
+        .padding(1, 1, 1, 1)
         .build()
       );
     }
diff --git a/platform/android/src/map/camera_position.cpp b/platform/android/src/map/camera_position.cpp
index cbf5f2e408..4266b64fdf 100644
--- a/platform/android/src/map/camera_position.cpp
+++ b/platform/android/src/map/camera_position.cpp
@@ -44,19 +44,20 @@ mbgl::CameraOptions CameraPosition::getCameraOptions(jni::JNIEnv& env, const jni
     static auto tilt = javaClass.GetField<jni::jdouble>(env, "tilt");
     static auto zoom = javaClass.GetField<jni::jdouble>(env, "zoom");
     static auto paddingField = javaClass.GetField<jni::Array<jni::jdouble>>(env, "padding");
-    static auto padding = position.Get(env, paddingField);
 
+    auto padding = position.Get(env, paddingField);
     auto center = LatLng::getLatLng(env, position.Get(env, target));
 
-    return mbgl::CameraOptions {
-            center,
-            padding ? EdgeInsets {padding.Get(env, 1) * pixelRatio, padding.Get(env, 0) * pixelRatio,
-                        padding.Get(env, 3) * pixelRatio, padding.Get(env, 2) * pixelRatio} : (EdgeInsets) {},
-            {},
-            position.Get(env, zoom),
-            position.Get(env, bearing),
-            position.Get(env, tilt)
-    };
+    return mbgl::CameraOptions{center,
+                               padding && padding.Length(env) == 4 ? EdgeInsets{padding.Get(env, 1) * pixelRatio,
+                                                                                padding.Get(env, 0) * pixelRatio,
+                                                                                padding.Get(env, 3) * pixelRatio,
+                                                                                padding.Get(env, 2) * pixelRatio}
+                                                                   : (EdgeInsets){},
+                               {},
+                               position.Get(env, zoom),
+                               position.Get(env, bearing),
+                               position.Get(env, tilt)};
 }
 
 void CameraPosition::registerNative(jni::JNIEnv &env) {