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Android 中使用高德地图实现根据经纬度信息画出轨迹、设置缩放倍数并定位到轨迹路线的方法

news 来源：原创 2024/9/19 17:53:36

一、添加依赖和权限

在项目的build.gradle文件中添加高德地图的依赖：

implementation 'com.amap.api:maps:latest_version'

在AndroidManifest.xml文件中添加必要的权限：

<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-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

二、布局文件

在布局文件中添加一个com.amap.api.maps.MapView用于显示地图：

<com.amap.api.maps.MapViewandroid:id="@+id/mapView"android:layout_width="match_parent"android:layout_height="match_parent" />

三、Activity 代码

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;import com.amap.api.maps.AMap;
import com.amap.api.maps.CameraUpdateFactory;
import com.amap.api.maps.MapView;
import com.amap.api.maps.model.LatLng;
import com.amap.api.maps.model.LatLngBounds;
import com.amap.api.maps.model.Polyline;
import com.amap.api.maps.model.PolylineOptions;import java.util.ArrayList;
import java.util.List;public class MapActivity extends AppCompatActivity {private MapView mapView;private AMap aMap;private List<LatLng> latLngList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_map);mapView = findViewById(R.id.mapView);mapView.onCreate(savedInstanceState);if (aMap == null) {aMap = mapView.getMap();}latLngList = new ArrayList<>();// 假设的经纬度数据，实际中可以从其他地方获取latLngList.add(new LatLng(39.9087, 116.3975));latLngList.add(new LatLng(39.9088, 116.3976));latLngList.add(new LatLng(39.9089, 116.3977));}@Overrideprotected void onResume() {super.onResume();mapView.onResume();drawPolylineAndSetZoom();}@Overrideprotected void onPause() {super.onPause();mapView.onPause();}@Overrideprotected void onDestroy() {super.onDestroy();mapView.onDestroy();}@Overrideprotected void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);mapView.onSaveInstanceState(outState);}private void drawPolylineAndSetZoom() {Polyline polyline = aMap.addPolyline(new PolylineOptions().addAll(latLngList).width(5).color(ContextCompat.getColor(this, R.color.polyline_color)));LatLngBounds bounds = getBoundsFromLatLngList(latLngList);if (bounds!= null) {aMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50));}}private LatLngBounds getBoundsFromLatLngList(List<LatLng> latLngList) {if (latLngList == null || latLngList.isEmpty()) {return null;}double minLat = Double.MAX_VALUE;double minLng = Double.MAX_VALUE;double maxLat = Double.MIN_VALUE;double maxLng = Double.MIN_VALUE;for (LatLng latLng : latLngList) {minLat = Math.min(minLat, latLng.latitude);minLng = Math.min(minLng, latLng.longitude);maxLat = Math.max(maxLat, latLng.latitude);maxLng = Math.max(maxLng, latLng.longitude);}return new LatLngBounds.Builder().include(new LatLng(minLat, minLng)).include(new LatLng(maxLat, maxLng)).build();}
}