ArcGIS for Android 100.3.0（9）：GPS定位

ArcGIS Runtime 100定位类——LocationDisplay

其官方解释为：管理当前位置在显示地图里的展示，包括当前位置的信息，符号，以及随地图的平移、旋转、缩放等进行自动变化。

也就是有了这个类，不仅可以获取当前位置信息进行定位，也可以将位置信息展示出来。

api:

https://developers.arcgis.com/android/latest/apireference/reference/com/esri/arcgisruntime/mapping/view/LocationDisplay.html

定位权限

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

直接上代码：

public class LocationActivity extends AppCompatActivity implements PermissionUtils.PermissionCallbacks {private static final int REQUEST_PERMISSION_CODE = 0;private MapView mMapView;private LocationDisplay mLocationDisplay;private String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_location);mMapView = (MapView) findViewById(R.id.mapview);String theURLString = "http://map.geoq.cn/arcgis/rest/services/ChinaOnlineCommunity/MapServer";ArcGISTiledLayer mainArcGISTiledLayer = new ArcGISTiledLayer(theURLString);Basemap mainBasemap = new Basemap(mainArcGISTiledLayer);ArcGISMap arcGISMap = new ArcGISMap(mainBasemap);mMapView.setMap(arcGISMap);if (PermissionUtils.hasPermissions(this, permissions)) {startLocation();} else {PermissionUtils.requestPermissions(this, REQUEST_PERMISSION_CODE, permissions);}}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);PermissionUtils.onRequestPermissionsResult(requestCode, permissions, grantResults, this);}@Overridepublic void onPermissionsAllGranted(int requestCode, List<String> perms, boolean isAllGranted) {if (isAllGranted) {startLocation();}}@Overridepublic void onPermissionsDenied(int requestCode, List<String> perms) {}private void startLocation() {mLocationDisplay = mMapView.getLocationDisplay();mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);//当我们执行LocationDisplay.startAsync()方法时候，会在地图上显示出我们当前位置mLocationDisplay.startAsync();//获取的点是基于当前地图坐标系的点Point point = mLocationDisplay.getMapLocation();Log.e("xyh", "point: " + point.toString());//获取基于GPS的位置信息LocationDataSource.Location location = mLocationDisplay.getLocation();//基于WGS84的经纬度坐标。Point point1 = location.getPosition();if (point1 != null) {Log.e("xyh", "point1: " + point1.toString());}//如果要在LocationDisplay里进行位置信息的自动监听，方法也很简单，只需要LocationDisplay.addLocationChangedListener即可mLocationDisplay.addLocationChangedListener(new LocationDisplay.LocationChangedListener() {@Overridepublic void onLocationChanged(LocationDisplay.LocationChangedEvent locationChangedEvent) {LocationDataSource.Location location = locationChangedEvent.getLocation();Log.e("xyh", "onLocationChanged: " + location.getPosition().toString());}});}@Overrideprotected void onPause() {super.onPause();mMapView.pause();}@Overrideprotected void onResume() {super.onResume();mMapView.resume();}@Overrideprotected void onDestroy() {super.onDestroy();mMapView.dispose();}
}

结束定位

 if (mLocationDisplay.isStarted())mLocationDisplay.stop();

位置监听的自动扫描模式

位置监听的自动扫描模式可能有点拗口，算是对于这个功能的直译吧。这个功能的意思是当你的位置信息变化时候，如何在地图上展示出来。

使用方法为：LocationDisplay.setAutoPanMode(LocationDisplay.AutoMode)。

模式一共有四种：

COMPASS_NAVIGATION 和NAVIGATION 分别最适用于步行导航和车载导航，用户的位置符号会固定显示在屏幕的某个点上，并且指向设备的顶部（也就是地图会随着用户移动而平移，随用户转弯而旋转）；

OFF 模式，用户位置符号会随位置变化而移动，但地图不会动；

RECENTER模式，当用户位置处于当前地图范围内时候，用户位置符号会随位置变化而移动，但地图不会动；当用户位置处于地图边缘时候，地图会自动平移是用户的当前位置重新居于显示地图中心。

LocationDisplay类里可以直接设置位置符号样式

当我们执行LocationDisplay.startAsync()方法时候，会在地图上显示出我们当前位置，默认的符号如下所示：

如果我们想要改变这个符号样式，只需要重新设置符号即可，代码如下所示:

locationDisplay = mMapView.getLocationDisplay();
Resources resources=getResources();
BitmapDrawable bitmapDrawable= new BitmapDrawable(BitmapFactory.decodeResource(resources,R.drawable.location));
final PictureMarkerSymbol campsiteSymbol = new PictureMarkerSymbol(bitmapDrawable);
campsiteSymbol.loadAsync();
campsiteSymbol.addDoneLoadingListener(new Runnable() {@Overridepublic void run() {locationDisplay.setDefaultSymbol(campsiteSymbol);//设置默认符号locationDisplay.setShowAccuracy(false);//隐藏符号的缓存区域}
});

对于位置符号的设置有以下几种：

locationDisplay.setAcquiringSymbol(campsiteSymbol);//设置当前位置的填充符号
locationDisplay.setAccuracySymbol(campsiteSymbol);//设置最后一个已知位置的标记符号
locationDisplay.setPingAnimationSymbol(campsiteSymbol);//设置当前位置更新时候的动画
locationDisplay.setCourseSymbol(campsiteSymbol);//设置当前位置的路线符号
locationDisplay.setHeadingSymbol(campsiteSymbol);//设置当前位置设备面对方向的符号
locationDisplay.setDefaultSymbol(campsiteSymbol);//设置默认符号

位置符号隐藏

在ArcGIS Runtime 100里假如我们只是想获取位置信息，而不需要显示出来，我们只需要将位置监听的模式设置为OFF，然后执行以下代码即可。

locationDisplay.setShowLocation(false);//隐藏符号
locationDisplay.setShowAccuracy(false);//隐藏符号的缓存区域
locationDisplay.setShowPingAnimation(false);//隐藏位置更新的符号动画

PermissionUtils:

/*** 动态申请权限工具类* Created by xiaoyehai on 2018/4/25 0025.*/public class PermissionUtils {public static final int GOTO_SEETING_CODE = 152;/*** 判断是否有权限** @param context* @param perms* @return*/public static boolean hasPermissions(@NonNull Context context, @Size(min = 1) @NonNull String... perms) {if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {return true;}if (context == null) {throw new IllegalArgumentException("Can't check permissions for null context");}for (String perm : perms) {if (ContextCompat.checkSelfPermission(context, perm) != PackageManager.PERMISSION_GRANTED) {return false;}}return true;}/*** 申请权限*/public static void requestPermissions(@NonNull Activity activity, int requestCode, String[] permissions) {List<String> permissionList = new ArrayList<>();for (String permission : permissions) {if (ContextCompat.checkSelfPermission(activity, permission) != PackageManager.PERMISSION_GRANTED) {permissionList.add(permission);}}String[] permissionsArray = permissionList.toArray(new String[permissionList.size()]);//将List转为数组if (permissionList.isEmpty()) {//不可能为空} else {ActivityCompat.requestPermissions(activity, permissionsArray, requestCode);//返回结果onRequestPermissionsResult}}/*** 申请权限的回调** @param requestCode  请求权限时传入的请求码，用于区别是哪一次请求的* @param permissions  所请求的所有权限的数组* @param grantResults 权限授予结果，和 permissions 数组参数中的权限一一对应，元素值为两种情况，如下:*                     授予: PackageManager.PERMISSION_GRANTED*                     拒绝: PackageManager.PERMISSION_DENIED*/public static void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,@NonNull int[] grantResults, @NonNull PermissionCallbacks callBack) {//授予的权限。List<String> granted = new ArrayList<>();//拒绝的权限List<String> denied = new ArrayList<>();for (int i = 0; i < permissions.length; i++) {String perm = permissions[i];if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {granted.add(perm);} else {denied.add(perm);}}if (null != callBack) {if (denied.isEmpty()) {callBack.onPermissionsAllGranted(requestCode, granted, denied.isEmpty());}if (!denied.isEmpty()) {callBack.onPermissionsDenied(requestCode, denied);}}}/*** 用户是否拒绝权限，并检查“不要提醒”。** @param activity* @param perms* @return*/public static boolean somePermissionPermanentlyDenied(Activity activity, @NonNull List<String> perms) {for (String deniedPermission : perms) {if (permissionPermanentlyDenied(activity, deniedPermission)) {return true;}}return false;}public static boolean permissionPermanentlyDenied(Activity activity, @NonNull String perms) {if (!ActivityCompat.shouldShowRequestPermissionRationale(activity, perms)) {return true;}return false;}public static void showDialogGoToAppSettting(final Activity activity) {AlertDialog dialog = new AlertDialog.Builder(activity).setMessage("去设置界面开启权限").setPositiveButton("确定", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {// 跳转到应用设置界面goToAppSetting(activity);}}).setCancelable(false).show();}/*** 跳转到应用设置界面*/public static void goToAppSetting(Activity activity) {Intent intent = new Intent();intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);Uri uri = Uri.fromParts("package", activity.getPackageName(), null);intent.setData(uri);activity.startActivityForResult(intent, GOTO_SEETING_CODE);}public static void showPermissionReason(final int requestCode, final Activity activity, final String[] permission, String s) {AlertDialog dialog = new AlertDialog.Builder(activity).setMessage(s).setPositiveButton("确定", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {requestPermissions(activity, requestCode, permission);}}).setCancelable(false).show();}public interface PermissionCallbacks {/*** @param isAllGranted 是否全部同意*/void onPermissionsAllGranted(int requestCode, List<String> perms, boolean isAllGranted);/***/void onPermissionsDenied(int requestCode, List<String> perms);}
}

下面来看看官方的例子

public class DisplayDeviceLocationActivity extends AppCompatActivity {private MapView mMapView;private LocationDisplay mLocationDisplay;private Spinner mSpinner;private int requestCode = 2;String[] reqPermissions = new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_display_device_location);mSpinner = (Spinner) findViewById(R.id.spinner);mMapView = (MapView) findViewById(R.id.mapView);ArcGISMap mMap = new ArcGISMap(Basemap.createImagery());mMapView.setMap(mMap);mLocationDisplay = mMapView.getLocationDisplay();// 监听位置数据源状态的更改mLocationDisplay.addDataSourceStatusChangedListener(new LocationDisplay.DataSourceStatusChangedListener() {@Overridepublic void onStatusChanged(LocationDisplay.DataSourceStatusChangedEvent dataSourceStatusChangedEvent) {// If LocationDisplay started OK, then continue.if (dataSourceStatusChangedEvent.isStarted())return;// No error is reported, then continue.if (dataSourceStatusChangedEvent.getError() == null)return;// If an error is found, handle the failure to start.// Check permissions to see if failure may be due to lack of permissions.boolean permissionCheck1 = ContextCompat.checkSelfPermission(DisplayDeviceLocationActivity.this, reqPermissions[0]) ==PackageManager.PERMISSION_GRANTED;boolean permissionCheck2 = ContextCompat.checkSelfPermission(DisplayDeviceLocationActivity.this, reqPermissions[1]) ==PackageManager.PERMISSION_GRANTED;if (!(permissionCheck1 && permissionCheck2)) {ActivityCompat.requestPermissions(DisplayDeviceLocationActivity.this, reqPermissions, requestCode);} else {// Report other unknown failure types to the user - for example, location services may not// be enabled on the device.String message = String.format("Error in DataSourceStatusChangedListener: %s", dataSourceStatusChangedEvent.getSource().getLocationDataSource().getError().getMessage());Toast.makeText(DisplayDeviceLocationActivity.this, message, Toast.LENGTH_LONG).show();// Update UI to reflect that the location display did not actually startmSpinner.setSelection(0, true);}}});// Populate the list for the Location display options for the spinner's AdapterArrayList<ItemData> list = new ArrayList<>();list.add(new ItemData("Stop", R.drawable.locationdisplaydisabled));list.add(new ItemData("On", R.drawable.locationdisplayon));list.add(new ItemData("Re-Center", R.drawable.locationdisplayrecenter));list.add(new ItemData("Navigation", R.drawable.locationdisplaynavigation));list.add(new ItemData("Compass", R.drawable.locationdisplayheading));SpinnerAdapter adapter = new SpinnerAdapter(this, R.layout.spinner_layout, R.id.txt, list);mSpinner.setAdapter(adapter);mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position, long id) {switch (position) {case 0:// Stop Location Displayif (mLocationDisplay.isStarted())mLocationDisplay.stop();break;case 1:// Start Location Displayif (!mLocationDisplay.isStarted())mLocationDisplay.startAsync();break;case 2:// RECENTER模式，当用户位置处于当前地图范围内时候，用户位置符号会随位置变化而移动，但地图不会动；// 当用户位置处于地图边缘时候，地图会自动平移是用户的当前位置重新居于显示地图中心。mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);if (!mLocationDisplay.isStarted())mLocationDisplay.startAsync();break;case 3:// Start Navigation Mode// 这种模式最适合于车载导航。mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.NAVIGATION);if (!mLocationDisplay.isStarted())mLocationDisplay.startAsync();break;case 4:// Start Compass Mode// 这种模式更适合用户行走时的路标导航。mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.COMPASS_NAVIGATION);if (!mLocationDisplay.isStarted())mLocationDisplay.startAsync();break;}}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {mLocationDisplay.startAsync();} else {Toast.makeText(DisplayDeviceLocationActivity.this, "权限被拒绝", Toast.LENGTH_SHORT).show();mSpinner.setSelection(0, true);}}@Overrideprotected void onPause() {super.onPause();mMapView.pause();}@Overrideprotected void onResume() {super.onResume();mMapView.resume();}@Overrideprotected void onDestroy() {super.onDestroy();mMapView.dispose();}
}

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