【Android】第3章（5）图层展示-php手册-php.cn

分类：C#、Android、VS2015、百度地图应用；创建日期：2016-02-04 3.4 示例4--图层展示一、简介 1、地图类型百度地图Android SDK 3.7.1提供了两种类型的地图资源（普通矢量地图和卫星图），开发者可以利用BaiduMap中的MapType属性（C#）来设置地图类型。C

分类：C#、Android、VS2015、百度地图应用；创建日期：2016-02-04

3.4 示例4--图层展示

一、简介

1、地图类型

百度地图Android SDK 3.7.1提供了两种类型的地图资源（普通矢量地图和卫星图），开发者可以利用BaiduMap中的MapType属性（C#）来设置地图类型。C#核心代码如下：

mMapView = FindViewById<texturemapview><span style="color: #000000;">(Resource.Id.bmapView);
mBaiduMap </span>=<span style="color: #000000;"> mMapView.Map;
</span><span style="color: #008000;">//</span><span style="color: #008000;">设置底图显示模式：普通地图</span>
mBaiduMap.MapType =<span style="color: #000000;"> BaiduMap.MapTypeNormal;
</span><span style="color: #008000;">//</span><span style="color: #008000;">设置底图显示模式：卫星地图</span>
mBaiduMap.MapType = BaiduMap.MapTypeSatellite;</texturemapview>

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2、实时交通图

当前，全国范围内已支持多个城市实时路况查询，且会陆续开通其他城市。

目前有哪些城市具有实时交通图？

目前（2016-01-27）已有31个城市开通，分别为南京，广州，重庆，东莞，长春，台州，福州，金华，北京，常州，杭州，温州，大连，南昌，宁波，沈阳，中山，珠海，佛山，泉州，石家庄，成都，青岛，深圳，武汉，乌鲁木齐，长沙，上海，天津，无锡，厦门。之后其他城市还会陆续开通。

在地图上打开实时路况的C#核心代码如下：

mMapView = FindViewById<texturemapview><span style="color: #000000;">(Resource.Id.bmapView);
mBaiduMap </span>=<span style="color: #000000;"> mMapView.Map;
</span><span style="color: #008000;">//</span><span style="color: #008000;">开启交通图</span>
mBaiduMap.TrafficEnabled = <span style="color: #0000ff;">true</span>;</texturemapview>

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3、百度城市热力图

百度地图SDK继为广大开发者开放热力图本地绘制能力之后，再次进一步开放百度自有数据的城市热力图层，帮助开发者构建形式更加多样的移动端应用。

百度城市热力图的性质及使用与实时交通图类似，只需要简单的接口调用，即可在地图上展现样式丰富的百度城市热力图。

在地图上开启百度城市热力图的C#核心代码如下：

mMapView = FindViewById<texturemapview><span style="color: #000000;">(Resource.Id.bmapView);
mBaiduMap </span>=<span style="color: #000000;"> mMapView.Map;
</span><span style="color: #008000;">//</span><span style="color: #008000;">开启交通图</span>
mBaiduMap.BaiduHeatMapEnabled = <span style="color: #0000ff;">true</span>;</texturemapview>

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在上一节例子的基础上，只需要再增加下面的步骤即可。

2、添加demo04_layers.axml文件

<?xml version=<span style="color: #800000;">"<span style="color: #800000;">1.0</span><span style="color: #800000;">"</span> encoding=<span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span>?>
<linearlayout xmlns:android="<span" style="color: #800000;">"<span style="color: #800000;">http://schemas.android.com/apk/res/android</span><span style="color: #800000;">"</span><span style="color: #000000;">
    android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">fill_parent</span><span style="color: #800000;">"</span><span style="color: #000000;">
    android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">fill_parent</span><span style="color: #800000;">"</span><span style="color: #000000;">
    android:orientation</span>=<span style="color: #800000;">"</span><span style="color: #800000;">vertical</span><span style="color: #800000;">"</span> >

    LinearLayout
        android:layout_width=<span style="color: #800000;">"</span><span style="color: #800000;">fill_parent</span><span style="color: #800000;">"</span><span style="color: #000000;">
        android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
        android:orientation</span>=<span style="color: #800000;">"</span><span style="color: #800000;">horizontal</span><span style="color: #800000;">"</span> >

        RadioGroup
            android:id=<span style="color: #800000;">"</span><span style="color: #800000;">@+id/RadioGroup</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_weight</span>=<span style="color: #800000;">"</span><span style="color: #800000;">2</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:orientation</span>=<span style="color: #800000;">"</span><span style="color: #800000;">horizontal</span><span style="color: #800000;">"</span> >

            RadioButton
                android:id=<span style="color: #800000;">"</span><span style="color: #800000;">@+id/normal</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:layout_weight</span>=<span style="color: #800000;">"</span><span style="color: #800000;">1</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:</span><span style="color: #0000ff;">checked</span>=<span style="color: #800000;">"</span><span style="color: #800000;">true</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:text</span>=<span style="color: #800000;">"</span><span style="color: #800000;">普通图</span><span style="color: #800000;">"</span> />

            RadioButton
                android:id=<span style="color: #800000;">"</span><span style="color: #800000;">@+id/statellite</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:layout_weight</span>=<span style="color: #800000;">"</span><span style="color: #800000;">1</span><span style="color: #800000;">"</span><span style="color: #000000;">
                android:text</span>=<span style="color: #800000;">"</span><span style="color: #800000;">卫星图</span><span style="color: #800000;">"</span> />
        

        CheckBox
            android:id=<span style="color: #800000;">"</span><span style="color: #800000;">@+id/traffice</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_weight</span>=<span style="color: #800000;">"</span><span style="color: #800000;">1</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:</span><span style="color: #0000ff;">checked</span>=<span style="color: #800000;">"</span><span style="color: #800000;">false</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:text</span>=<span style="color: #800000;">"</span><span style="color: #800000;">交通图</span><span style="color: #800000;">"</span> />
         
         CheckBox
            android:id=<span style="color: #800000;">"</span><span style="color: #800000;">@+id/baiduHeatMap</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">wrap_content</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:layout_weight</span>=<span style="color: #800000;">"</span><span style="color: #800000;">1</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:</span><span style="color: #0000ff;">checked</span>=<span style="color: #800000;">"</span><span style="color: #800000;">false</span><span style="color: #800000;">"</span><span style="color: #000000;">
            android:text</span>=<span style="color: #800000;">"</span><span style="color: #800000;">百度城市热力图</span><span style="color: #800000;">"</span> />
    </linearlayout>

    com.baidu.mapapi.map.TextureMapView
        android:id=<span style="color: #800000;">"</span><span style="color: #800000;">@+id/bmapView</span><span style="color: #800000;">"</span><span style="color: #000000;">
        android:layout_width</span>=<span style="color: #800000;">"</span><span style="color: #800000;">fill_parent</span><span style="color: #800000;">"</span><span style="color: #000000;">
        android:layout_height</span>=<span style="color: #800000;">"</span><span style="color: #800000;">fill_parent</span><span style="color: #800000;">"</span><span style="color: #000000;">
        android:clickable</span>=<span style="color: #800000;">"</span><span style="color: #800000;">true</span><span style="color: #800000;">"</span> />

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2、添加Demo04Layers.cs文件

在SrcSdkDemos文件夹下添加该文件。

<span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.App;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.Content.PM;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.OS;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.Widget;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Com.Baidu.Mapapi.Map;

</span><span style="color: #0000ff;">namespace</span><span style="color: #000000;"> BdMapV371Demos.SrcSdkDemos
{
    </span><span style="color: #808080;">///</span> <span style="color: #808080;"><summary></summary></span>
    <span style="color: #808080;">///</span><span style="color: #008000;"> 演示地图图层显示的控制方法
    </span><span style="color: #808080;">///</span> <span style="color: #808080;"></span>
    [Activity(Label = <span style="color: #800000;">"</span><span style="color: #800000;">@string/demo_name_layers</span><span style="color: #800000;">"</span><span style="color: #000000;">,
        ConfigurationChanges </span>= ConfigChanges.Orientation |<span style="color: #000000;"> ConfigChanges.KeyboardHidden,
        ScreenOrientation </span>=<span style="color: #000000;"> ScreenOrientation.Sensor)]
    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Demo04Layers : Activity
    {
        </span><span style="color: #008000;">//</span><span style="color: #008000;">TextureMapView 是地图主控件</span>
        <span style="color: #0000ff;">PRivate</span><span style="color: #000000;"> TextureMapView mMapView;
        </span><span style="color: #0000ff;">private</span><span style="color: #000000;"> BaiduMap mBaiduMap;

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnCreate(Bundle savedInstanceState)
        {
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.demo04_layers);

            mMapView </span>= FindViewById<texturemapview><span style="color: #000000;">(Resource.Id.bmapView);
            mBaiduMap </span>=<span style="color: #000000;"> mMapView.Map;
            mBaiduMap.SetMapStatus(MapStatusUpdateFactory.NewLatLng(MainActivity.HeNanUniversity));

            </span><span style="color: #008000;">//</span><span style="color: #008000;">设置底图显示模式：普通图</span>
            <span style="color: #0000ff;">var</span> normal = FindViewById<radiobutton><span style="color: #000000;">(Resource.Id.normal);
            normal.Click </span>+= <span style="color: #0000ff;">delegate</span><span style="color: #000000;">
            {
                mBaiduMap.MapType </span>=<span style="color: #000000;"> BaiduMap.MapTypeNormal;
            };

            </span><span style="color: #008000;">//</span><span style="color: #008000;">设置底图显示模式：卫星图</span>
            <span style="color: #0000ff;">var</span> statellite = FindViewById<radiobutton><span style="color: #000000;">(Resource.Id.statellite);
            statellite.Click </span>+= <span style="color: #0000ff;">delegate</span><span style="color: #000000;">
            {
                mBaiduMap.MapType </span>=<span style="color: #000000;"> BaiduMap.MapTypeSatellite;
            };

            </span><span style="color: #008000;">//</span><span style="color: #008000;">是否显示交通图</span>
            <span style="color: #0000ff;">var</span> traffice = FindViewById<checkbox><span style="color: #000000;">(Resource.Id.traffice);
            traffice.CheckedChange </span>+= (s, e) =><span style="color: #000000;">
            {
                mBaiduMap.TrafficEnabled </span>=<span style="color: #000000;"> e.IsChecked;
            };

            </span><span style="color: #008000;">//</span><span style="color: #008000;">是否显示热力图</span>
            <span style="color: #0000ff;">var</span> baiduHeatMap = FindViewById<checkbox><span style="color: #000000;">(Resource.Id.baiduHeatMap);
            traffice.CheckedChange </span>+= (s, e) =><span style="color: #000000;">
            {
                mBaiduMap.BaiduHeatMapEnabled </span>=<span style="color: #000000;"> e.IsChecked;
            };
        }

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnPause()
        {
            mMapView.OnPause();
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnPause();
        }

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnResume()
        {
            mMapView.OnResume();
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnResume();
        }

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnDestroy()
        {
            mMapView.OnDestroy();
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnDestroy();
        }
    }
}</span></checkbox></checkbox></radiobutton></radiobutton></texturemapview>

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4、修改MainActivity.cs文件

在MainActivity.cs文件的demos字段定义中添加下面的代码。

<span style="color: #008000;">          //</span><span style="color: #008000;">示例4--图层展示</span>
            <span style="color: #0000ff;">new</span> DemoInfo<activity><span style="color: #000000;">(Resource.String.demo_title_layers,
                Resource.String.demo_desc_layers,
                </span><span style="color: #0000ff;">new</span> Demo04Layers()),</activity>

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运行。