SupportMapFragment getView（）。findViewById（0x1）为null

Question

为什么当mMapFragment不为null时返回null？

View zoom = mMapFragment.getView().findViewById(0x1);

我需要将缩放按钮移动到相应的一侧

   if (zoom != null && zoom.getLayoutParams() instanceof RelativeLayout.LayoutParams) {
        // ZoomControl is inside of RelativeLayout
        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) zoom.getLayoutParams();
        // Align it to - parent BOTTOM|LEFT
        params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        params.addRule(RelativeLayout.ALIGN_PARENT_LEFT);

        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, 0);
        params.addRule(RelativeLayout.ALIGN_PARENT_TOP, 0);

        // Update margins, set to 10dp
        final int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10,
            getResources().getDisplayMetrics());
        params.setMargins(margin, margin, margin, margin);

        zoom.setLayoutParams(params);
      }

Answer 1

使用GoogleMap和MapView代替SupportMapFragment：

XML：

<com.google.android.gms.maps.MapView
        android:id="@+id/map1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
</com.google.android.gms.maps.MapView>

Java onCreateView函数：

MapView mapView = (MapView) v.findViewById(R.id.mapaPrincipal);
GoogleMap map = mapView.getMap();

注意：你可以定义＆＃34; mapView＆＃34;和＆＃34;地图＆＃34;作为全局变量，并在onCreateView（）

中初始化后在所有函数中使用它