[android] - use custom viewpager to allow horizontal swiping

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/fragment/ViewPagerActivity.java

@@ -31,11 +31,11 @@ protected void onCreate(Bundle savedInstanceState) {
     }
   }
 
-  public static class MapFragmentAdapter extends FragmentPagerAdapter {
+  static class MapFragmentAdapter extends FragmentPagerAdapter {
 
     private static int NUM_ITEMS = 3;
 
-    public MapFragmentAdapter(FragmentManager fragmentManager) {
+    MapFragmentAdapter(FragmentManager fragmentManager) {
       super(fragmentManager);
     }
 

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/view/MapViewPager.java

@@ -0,0 +1,20 @@
+package com.mapbox.mapboxsdk.testapp.view;
+
+import android.content.Context;
+import android.support.v4.view.PagerTabStrip;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.view.SurfaceView;
+import android.view.View;
+
+public class MapViewPager extends ViewPager {
+
+  public MapViewPager(Context context, AttributeSet attrs) {
+    super(context, attrs);
+  }
+
+  @Override
+  protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
+    return v instanceof SurfaceView || v instanceof PagerTabStrip || (super.canScroll(v, checkV, dx, x, y));
+  }
+}

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

@@ -4,7 +4,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <android.support.v4.view.ViewPager
+    <com.mapbox.mapboxsdk.testapp.view.MapViewPager
         android:id="@+id/viewpager"
         android:layout_width="match_parent"
         android:layout_height="match_parent">
@@ -17,6 +17,6 @@
             android:paddingBottom="4dp"
             android:paddingTop="4dp"/>
 
-    </android.support.v4.view.ViewPager>
+    </com.mapbox.mapboxsdk.testapp.view.MapViewPager>
 
 </RelativeLayout>