谷歌开源地图项目移植到鸿蒙！

OSMDroid-ohos 是 Google 开源地图项目 OSMDroid 移植到 HarmonyOS 系统上的精简版，可以实现在 HarmonyOS 系统上做地图应用开发。

当前 OSMDroid-ohos 地图根据国内开发情况，默认移植了高德的瓦片地图显示。

OSMDroid-ohos 地图提供基本瓦片地图显示，地图指南针覆盖物，地图定位坐标覆盖物，提供单指手势拖拽地图功能，单指手势双击放大地图功能，双指手势缩放地图功能，双指手势旋转地图功能。

MapView 使用

xml 布局添加：

<DependentLayout ohos:id=”$+id:osm_map_container” ohos:height=”match_content” ohos:width=”match_parent”> <com.talkweb.osmharmony.views.MapView ohos:id=”$+id:osm_map_view” ohos:height=”match_parent” ohos:width=”match_parent” ohos:horizontal_center=”true”/> ·················

mMapContainerView = (DependentLayout) findComponentById(ResourceTable.Id_osm_map_container); mapView = (MapView) findComponentById(ResourceTable.Id_osm_map_view);

java 代码添加：

mMapContainerView = (DependentLayout) findComponentById(ResourceTable.Id_osm_map_container); DependentLayout.LayoutConfig layoutConfig = new DependentLayout.LayoutConfig(); layoutConfig.width = DependentLayout.LayoutConfig.MATCH_PARENT; layoutConfig.height = DependentLayout.LayoutConfig.MATCH_PARENT;

//实例化MapView mapView = new MapView(this); mMapContainerView.addComponent(mapView, 0, layoutConfig);

请求相应权限

config.json 配置文件添加权限：

······

“module”: { “reqPermissions”: [ {“name”: “ohos.permission.LOCATION”}, {“name”: “ohos.permission.LOCATION_IN_BACKGROUND”}, {“name”: “ohos.permission.ACCELEROMETER”}, {“name”: “ohos.permission.GET_NETWORK_INFO”}, {“name”: “ohos.permission.SET_NETWORK_INFO”}, {“name”: “ohos.permission.INTERNET”}, {“name”: “ohos.permission.GYROSCOPE”}, {“name”: “ohos.permission.READ_USER_STORAGE”}, {“name”: “ohos.permission.WRITE_USER_STORAGE”} ],

······

Ability 动态请求权限：

public class MainAbility extends Ability {

private String[] requestPermissions = { SystemPermission.WRITE_USER_STORAGE, SystemPermission.READ_USER_STORAGE, SystemPermission.LOCATION }; @Override public void onStart(Intent intent) { super.onStart(intent); super.setMainRoute(MainAbilitySlice.class.getName()); PermissionsUtils.getInstance().requestPermissions(this, requestPermissions); } @Override public void onRequestPermissionsFromUserResult(int requestCode, String[] permissions, int[] grantResults) { PermissionsUtils.getInstance().onRequestPermissionsResult(requestCode, permissions, grantResults); }

}

启动多点触控手势

// 启动多点触控放大缩小旋转 MapView.setMultiTouchControls(true);

设置地图中心点

mMapController = mapView.getController(); //设置地图中心点位置 mMapController.setCenter(new GeoPoint(28.222567, 112.884651));

设置地图缩放级别

mMapController = mapView.getController(); //设置初始化缩放级别 mMapController.setZoom(15.0);

离线地图加载

//加载离线地图 File file = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getParentFile(); String strFilepath = file.getPath() + “/osmdroid/”;

File[] files = new File(strFilepath).listFiles(); if (files != null && files.length > 0) { File exitFile = files[0]; if (exitFile.exists()) { String filename = exitFile.getName(); String extension = filename.substring(filename.lastIndexOf(“.”) + 1); if (ArchiveFileFactory.isFileExtensionRegistered(extension)) { IRegisterReceiver registerReceiver = new SimpleRegisterReceiver(this); File[] offlineFiles = new File[]{exitFile}; OfflineTileProvider tileProvider = new OfflineTileProvider(registerReceiver, offlineFiles); mapView.setTileProvider(tileProvider);

IArchiveFile[] archives = tileProvider.getArchives(); if (archives.length > 0) { Set<String> tileSource = archives[0].getTileSources(); if (!tileSource.isEmpty()) { String source = tileSource.iterator().next(); mapView.setTileSource(FileBasedTileSource.getSource(source)); mapView.setUseDataConnection(false); } } } }

}

添加覆盖物

添加指南针： //指南针 InternalCompassOrientationProvider compassProvider = new InternalCompassOrientationProvider(this); CompassOverlay mCompassOverlay = new CompassOverlay(this, compassProvider, mapView); mCompassOverlay.enableCompass(); mapView.getOverlays().add(mCompassOverlay);

添加我的定位点： private MapView mapView; private MyLocationNewOverlay mLocationOverlay;

@Override public void onStart(Intent intent) { super.onStart(intent); super.setUIContent(ResourceTable.Layout_ability_main);

if (isGrantedLocationPermission()) { addMyLocationOverlayMark(); } else { PermissionsUtils.getInstance().setRequestListener(permission -> { if (permission.equals(SystemPermission.LOCATION)) { addMyLocationOverlayMark(); } }); }

}

@Override public void onActive() { super.onActive(); mapView.onResume(); if (mLocationOverlay != null) { mLocationOverlay.enableMyLocation(); } }

@Override protected void onInactive() { super.onInactive(); mapView.onPause(); if (mLocationOverlay != null) { mLocationOverlay.disableMyLocation(); } }

private boolean isGrantedLocationPermission() { return IBundleManager.PERMISSION_GRANTED == verifyCallingOrSelfPermission(SystemPermission.LOCATION); }

private void addMyLocationOverlayMark() { //添加当前设备自动定位点，需要先具有设备位置权限 mLocationOverlay = new MyLocationNewOverlay(mapView); PixelMap personPixelMap = ResourceHelper.getPixmap(this, ResourceTable.Media_person); PixelMap directionPixelMap = ResourceHelper.getPixmap(this, ResourceTable.Media_loc); mLocationOverlay.setDirectionArrow(personPixelMap, directionPixelMap); mapView.getOverlays().add(mLocationOverlay); }

添加地图比例尺： //添加比例尺 ScaleBarOverlay scaleBar = new ScaleBarOverlay(mapView); scaleBar.setCentred(true); scaleBar.setAlignBottom(true); //底部显示 mapView.getOverlays().add(scaleBar);

添加地图自由旋转： //地图自由旋转 RotationGestureOverlay mRotationGestureOverlay = new RotationGestureOverlay(mapView); mRotationGestureOverlay.setEnabled(true); mapView.getOverlays().add(mRotationGestureOverlay);

添加路径规划线路点： //路径规划点 Polyline polyline = new Polyline();

//添加路径上的关键坐标点 for(int i = 0; i < size; i++) { polyline.addPoint(new GeoPoint(latitude, longitude)); }

//设置信息框标题 polyline.setTitle(“title”); //设置信息框内容 polyline.setSubDescription(polyline.getDistance() + “”); //设置线宽度为50 polyline.getOutlinePaint().setStrokeWidth(20); //设置线的颜色为红色 polyline.getOutlinePaint().setColor(Color.BLUE); polyline.setInfoWindow(new BasicInfoWindow(ResourceTable.Layout_bonuspack_bubble, mapeView)); mapView.getOverlayManager().add(polyline);

码云仓库地址： https://gitee.com/talkwebyunchaung/osmdroid-ohos

来源：鸿蒙技术社区