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/* Copyright 2014 ESRI */*from w w w . ja va 2 s.c om*/ * All rights reserved under the copyright laws of the United States * and applicable international laws, treaties, and conventions. * * You may freely redistribute and use this sample code, with or * without modification, provided you include the original copyright * notice and use restrictions. * * See the Sample code usage restrictions document for further information. * */ package com.arcgis.android.samples.maps.fragmentmanagement; import android.os.Bundle; import android.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.esri.android.map.MapView; import com.esri.android.map.ags.ArcGISFeatureLayer; import com.esri.android.map.ags.ArcGISTiledMapServiceLayer; import com.esri.core.geometry.Envelope; import com.esri.core.geometry.GeometryEngine; import com.esri.core.geometry.Point; import com.esri.core.geometry.SpatialReference; /** * A fragment representing a map view. Displays a basemap layer * and a number of feature layers in a MapView. */ public class MapFragment extends Fragment { /** Fragment argument representing a String ID of the currently selected basemap */ public static final String ARG_BASEMAP_ID = "BasemapId"; public static final String BASEMAP_NAME_STREETS = "Streets"; public static final String BASEMAP_NAME_TOPO = "Topographic"; public static final String BASEMAP_NAME_GRAY = "Gray"; public static final String BASEMAP_NAME_OCEANS = "Oceans"; private final String KEY_MAP_STATE = "MapState"; private String mBasemapName; // the mapview private MapView mMapView = null; // basemap layer private ArcGISTiledMapServiceLayer mBasemapLayer; // feature layers private ArcGISFeatureLayer mFeatureLayer0 = null; private ArcGISFeatureLayer mFeatureLayer1 = null; private ArcGISFeatureLayer mFeatureLayer2 = null; // current map state private String mMapState = null; /** * Mandatory empty constructor for the fragment manager to instantiate the fragment * (e.g. upon screen orientation changes). */ public MapFragment() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /** Calling setRetainInstance() causes the Fragment instance to be retained * when its Activity is destroyed and recreated. This allows map Layer * objects to be retained so data will not need to be fetched from the network again. */ setRetainInstance(true); // Retrieve arguments if (mBasemapName == null && getArguments().containsKey(ARG_BASEMAP_ID)) { mBasemapName = getArguments().getString(ARG_BASEMAP_ID); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Reinstate saved instance state (if any) if (savedInstanceState != null) { mMapState = savedInstanceState.getString(KEY_MAP_STATE, null); } // Create new MapView object. Note that, unlike Layers objects, the MapView can't be // retained when the Activity is destroyed and recreated, because the old MapView // is tied to the old Activity. mMapView = new MapView(getActivity()); // Restore map state (center and resolution) if a previously saved state is available, // otherwise set initial extent if (mMapState == null) { SpatialReference mSR = SpatialReference.create(3857); Point p1 = GeometryEngine.project(-120.0, 0.0, mSR); Point p2 = GeometryEngine.project(-60.0, 50.0, mSR); Envelope mInitExtent = new Envelope(p1.getX(), p1.getY(), p2.getX(), p2.getY()); mMapView.setExtent(mInitExtent); } else { mMapView.restoreState(mMapState); } // Create layers unless retained objects are available if (mBasemapLayer == null) { mBasemapLayer = createBasemapLayer(mBasemapName); } if (mFeatureLayer0 == null) { mFeatureLayer0 = new ArcGISFeatureLayer( "http://sampleserver5.arcgisonline.com/ArcGIS/rest/services/LocalGovernment/Recreation/FeatureServer/0", ArcGISFeatureLayer.MODE.ONDEMAND); } if (mFeatureLayer1 == null) { mFeatureLayer1 = new ArcGISFeatureLayer( "http://sampleserver5.arcgisonline.com/ArcGIS/rest/services/LocalGovernment/Recreation/FeatureServer/1", ArcGISFeatureLayer.MODE.ONDEMAND); } if (mFeatureLayer2 == null) { mFeatureLayer2 = new ArcGISFeatureLayer( "http://sampleserver5.arcgisonline.com/ArcGIS/rest/services/LocalGovernment/Recreation/FeatureServer/2", ArcGISFeatureLayer.MODE.ONDEMAND); } // Add layers to MapView mMapView.addLayer(mBasemapLayer); mMapView.addLayer(mFeatureLayer0); mMapView.addLayer(mFeatureLayer1); mMapView.addLayer(mFeatureLayer2); // set logo and enable wrap around mMapView.enableWrapAround(true); mMapView.setEsriLogoVisible(true); return mMapView; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Save the map state (map center and resolution). if (mMapState != null) { outState.putString(KEY_MAP_STATE, mMapState); } } @Override public void onPause() { super.onPause(); // Save map state and pause the MapView to save battery mMapState = mMapView.retainState(); mMapView.pause(); } @Override public void onResume() { super.onResume(); // Start the MapView threads running again mMapView.unpause(); } @Override public void onDestroyView() { super.onDestroyView(); // Must remove our layers from MapView before calling recycle(), or we won't be able to reuse them mMapView.removeLayer(mBasemapLayer); mMapView.removeLayer(mFeatureLayer0); mMapView.removeLayer(mFeatureLayer1); mMapView.removeLayer(mFeatureLayer2); // Release MapView resources mMapView.recycle(); mMapView = null; } /** * Changes the basemap. * * @param basemapName String ID of the basemap to use. */ public void changeBasemap(String basemapName) { mBasemapName = basemapName; if (mMapView == null) { mBasemapLayer = null; } else { // Remove old basemap layer and add a new one as the first layer to be drawn mMapView.removeLayer(mBasemapLayer); mBasemapLayer = createBasemapLayer(mBasemapName); mMapView.addLayer(mBasemapLayer, 0); } } /** * Creates a basemap layer. * * @param basemapName String ID of the basemap to use. * @return ArcGISTiledMapServiceLayer for the requested basemap. */ private ArcGISTiledMapServiceLayer createBasemapLayer(String basemapName) { String url = "http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"; if (basemapName.equalsIgnoreCase(BASEMAP_NAME_STREETS)) { url = "http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"; } else if (basemapName.equalsIgnoreCase(BASEMAP_NAME_GRAY)) { url = "http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer"; } else if (basemapName.equalsIgnoreCase(BASEMAP_NAME_OCEANS)) { url = "http://services.arcgisonline.com/arcgis/rest/services/Ocean/World_Ocean_Base/MapServer"; } return new ArcGISTiledMapServiceLayer(url); } }