arcgis for android（六）定位

约定不等于承诺〃 2022-09-09 06:22 15阅读 0赞

1、上一节讲了如何加载天地图**arcgis for android 入门与提高（五）加载天地图**[arcgis for android 入门与提高（五）加载天地图\_郝大大的博客-CSDN博客\_android studio 天地图][arcgis for android _-CSDN_android studio]，这节讲解如何定位，定位有很多方式，但是原理都是基于GPS，**第一种**常用的定位方式就是Android系统自带的定位，封装在**LocationListener**和**LocationManager**里面，自带的有个很大的缺陷：室内基本无法定位！坐标系是WGS84的，误差在十米左右；**第二种**可以用百度定位API，对室内定位支持较好，但是它用的是百度坐标系；**第三**就是本章要讲的**LocationDisplay**，我们用的2000坐标系的底图，在上面可以轻松设置各种空间参考，也是封装好了，室内也能解算当前位置！

2、Android现在定位需要权限，用户允许定位才行，主要是**ACCESS\_FINE\_LOCATION**和**ACCESS\_COARSE\_LOCATION** 这两个权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

3、请求权限

List<String> permissionList = new ArrayList<>();
    if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
            permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
    }
    if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
            permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        permissionList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
    }
    
    if (!permissionList.isEmpty()) {
        String[] permissions = permissionList.toArray(new String[permissionList.size()]);
        ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
    }

4、定位有三种模式：

自动居中模式，可以用来初始化显示当前位置：![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_20_color_FFFFFF_t_70_g_se_x_16][]

导航模式：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

指北针模式：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

5、完整代码：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".MainActivity">
    
        <com.esri.arcgisruntime.mapping.view.MapView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/mapview"/>
    
    </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.androidgistest">
    
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    
        <uses-permission android:name="android.permission.INTERNET" />
        <uses-feature android:glEsVersion="0x00020000" android:required="true" />
    
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/Theme.AndroidGISTest">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

package com.example.androidgistest;
    
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.app.ActivityCompat;
    import androidx.core.content.ContextCompat;
    
    import android.Manifest;
    import android.content.pm.PackageManager;
    import android.os.Bundle;
    
    import com.esri.arcgisruntime.layers.WebTiledLayer;
    import com.esri.arcgisruntime.mapping.ArcGISMap;
    import com.esri.arcgisruntime.mapping.Basemap;
    import com.esri.arcgisruntime.mapping.Viewpoint;
    import com.esri.arcgisruntime.mapping.view.LocationDisplay;
    import com.esri.arcgisruntime.mapping.view.MapView;
    import com.google.android.material.snackbar.Snackbar;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity {
    
        private MapView mMapView;
        private LocationDisplay mLocationDisplay;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            mMapView = findViewById(R.id.mapview);
            mMapView.setAttributionTextVisible(false);
    
    //        WebTiledLayer webTiledLayer = TianDiTuMethodsClass.CreateTianDiTuTiledLayer(TianDiTuMethodsClass.LayerType.TIANDITU_VECTOR_2000);
    //        Basemap tdtBasemap = new Basemap(webTiledLayer);
    //        WebTiledLayer webTiledLayer1 = TianDiTuMethodsClass.CreateTianDiTuTiledLayer(TianDiTuMethodsClass.LayerType.TIANDITU_VECTOR_ANNOTATION_CHINESE_2000);
    //        tdtBasemap.getBaseLayers().add(webTiledLayer1);
    
            WebTiledLayer webTiledLayer2 = TianDiTuMethodsClass.CreateTianDiTuTiledLayer(TianDiTuMethodsClass.LayerType.TIANDITU_IMAGE_2000);
            Basemap tdtBasemap2 = new Basemap(webTiledLayer2);
            WebTiledLayer webTiledLayer22 = TianDiTuMethodsClass.CreateTianDiTuTiledLayer(TianDiTuMethodsClass.LayerType.TIANDITU_IMAGE_ANNOTATION_CHINESE_2000);
            tdtBasemap2.getBaseLayers().add(webTiledLayer22);
    
            ArcGISMap map = new ArcGISMap(tdtBasemap2);
            mMapView.setMap(map);
            mMapView.setViewpoint(new Viewpoint(34.77669, 113.67922, 10000));
    
            //请求权限
            List<String> permissionList = new ArrayList<>();
            if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
                    permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
            }
            if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
                    permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                permissionList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
            }
    
            if (!permissionList.isEmpty()) {
                String[] permissions = permissionList.toArray(new String[permissionList.size()]);
                ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
            }
    
            mLocationDisplay = mMapView.getLocationDisplay();
            mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
            //mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.NAVIGATION);
            //mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.COMPASS_NAVIGATION);
            if (!mLocationDisplay.isStarted())
                mLocationDisplay.startAsync();
            mLocationDisplay.addLocationChangedListener(new LocationDisplay.LocationChangedListener() {
                @Override
                public void onLocationChanged(LocationDisplay.LocationChangedEvent locationChangedEvent) {
                    double longitude = locationChangedEvent.getLocation().getPosition().getX();
                    double latitude = locationChangedEvent.getLocation().getPosition().getY();
                    Snackbar.make(mMapView, longitude + " " + latitude, Snackbar.LENGTH_LONG).show();
                }
            });
    
        }
    
        @Override
        protected void onPause() {
            super.onPause();
            mMapView.pause();
        }
    
        @Override
        protected void onResume() {
            super.onResume();
            mMapView.resume();
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            mMapView.dispose();
            //关闭定位
            if (mLocationDisplay.isStarted())
                mLocationDisplay.stop();
        }
    }

6、下一节讲解 **arcgis for android 入门与提高（七）**加载服务[arcgis for android 入门与提高（七）加载arcgis server服务\_郝大大的博客-CSDN博客][arcgis for android _arcgis server_-CSDN]

欢迎订阅专栏！

[arcgis for android _-CSDN_android studio]: https://blog.csdn.net/HB_Programmer/article/details/107731664
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220829/cf86edbd73ca4310970e0353a719d5b6.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_20_color_FFFFFF_t_70_g_se_x_16 1]: /images/20220829/38379a24563c4c99ba32277d42777080.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5LmL5LmO6ICF5Lmf5ZOm_size_20_color_FFFFFF_t_70_g_se_x_16 2]: /images/20220829/1a74b65fcca745f5841f377d96caf22a.png
[arcgis for android _arcgis server_-CSDN]: https://blog.csdn.net/HB_Programmer/article/details/120009351