mMapView = FindViewById<TextureMapView>(Resource.Id.bmapView);
mBaiduMap = mMapView.Map;
//设置底图显示模式：普通地图
mBaiduMap.MapType = BaiduMap.MapTypeNormal;
//设置底图显示模式：卫星地图
mBaiduMap.MapType = BaiduMap.MapTypeSatellite; 

mMapView = FindViewById<TextureMapView>(Resource.Id.bmapView);
mBaiduMap = mMapView.Map;
//开启交通图
mBaiduMap.TrafficEnabled = true; 

mMapView = FindViewById<TextureMapView>(Resource.Id.bmapView);
mBaiduMap = mMapView.Map;
//开启交通图
mBaiduMap.BaiduHeatMapEnabled = true;

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >

  <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <RadioGroup
      android:id="@+id/RadioGroup"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_weight="2"
      android:orientation="horizontal" >

      <RadioButton
        android:id="@+id/normal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:checked="true"
        android:text="普通图" />

      <RadioButton
        android:id="@+id/statellite"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="卫星图" />
    </RadioGroup>

    <CheckBox
      android:id="@+id/traffice"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:checked="false"
      android:text="交通图" />
     
     <CheckBox
      android:id="@+id/baiduHeatMap"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:checked="false"
      android:text="百度城市热力图" />
  </LinearLayout>

  <com.baidu.mapapi.map.TextureMapView
    android:id="@+id/bmapView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:clickable="true" />

</LinearLayout>

using Android.App;
using Android.Content.PM;
using Android.OS;
using Android.Widget;
using Com.Baidu.Mapapi.Map;

namespace BdMapV371Demos.SrcSdkDemos
{
  /// <summary>
  /// 演示地图图层显示的控制方法
  /// </summary>
  [Activity(Label = "@string/demo_name_layers",
    ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.KeyboardHidden,
    ScreenOrientation = ScreenOrientation.Sensor)]
  public class Demo04Layers : Activity
  {
    //TextureMapView 是地图主控件
    private TextureMapView mMapView;
    private BaiduMap mBaiduMap;

    protected override void OnCreate(Bundle savedInstanceState)
    {
      base.OnCreate(savedInstanceState);
      SetContentView(Resource.Layout.demo04_layers);

      mMapView = FindViewById<TextureMapView>(Resource.Id.bmapView);
      mBaiduMap = mMapView.Map;
      mBaiduMap.SetMapStatus(MapStatusUpdateFactory.NewLatLng(MainActivity.HeNanUniversity));

      //设置底图显示模式：普通图
      var normal = FindViewById<RadioButton>(Resource.Id.normal);
      normal.Click += delegate
      {
        mBaiduMap.MapType = BaiduMap.MapTypeNormal;
      };

      //设置底图显示模式：卫星图
      var statellite = FindViewById<RadioButton>(Resource.Id.statellite);
      statellite.Click += delegate
      {
        mBaiduMap.MapType = BaiduMap.MapTypeSatellite;
      };

      //是否显示交通图
      var traffice = FindViewById<CheckBox>(Resource.Id.traffice);
      traffice.CheckedChange += (s, e) =>
      {
        mBaiduMap.TrafficEnabled = e.IsChecked;
      };

      //是否显示热力图
      var baiduHeatMap = FindViewById<CheckBox>(Resource.Id.baiduHeatMap);
      traffice.CheckedChange += (s, e) =>
      {
        mBaiduMap.BaiduHeatMapEnabled = e.IsChecked;
      };
    }

    protected override void OnPause()
    {
      mMapView.OnPause();
      base.OnPause();
    }

    protected override void OnResume()
    {
      mMapView.OnResume();
      base.OnResume();
    }

    protected override void OnDestroy()
    {
      mMapView.OnDestroy();
      base.OnDestroy();
    }
  }
}

     //示例4--图层展示
      new DemoInfo<Activity>(Resource.String.demo_title_layers,
        Resource.String.demo_desc_layers,
        new Demo04Layers()),