arcgis runtime 100。屏幕上画点

/* Copyright 2016 Esri
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	*    http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	*/
	package com.esri.arcgisruntime.samples.showcallout;
	import android.graphics.Color;
	import android.os.Bundle;
	import android.support.v7.app.AppCompatActivity;
	import android.util.Log;
	import android.view.MotionEvent;
	import android.widget.TextView;
	import com.esri.arcgisruntime.geometry.GeometryEngine;
	import com.esri.arcgisruntime.geometry.Point;
	import com.esri.arcgisruntime.geometry.SpatialReferences;
	import com.esri.arcgisruntime.mapping.ArcGISMap;
	import com.esri.arcgisruntime.mapping.Basemap;
	import com.esri.arcgisruntime.mapping.view.Callout;
	import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener;
	import com.esri.arcgisruntime.mapping.view.MapView;
	public class MainActivity extends AppCompatActivity {
	private static final String sTag = "Gesture";
	private MapView mMapView;
	private Callout mCallout;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	// inflate MapView from layout
	mMapView = (MapView) findViewById(R.id.mapView);
	// create a map with the Basemap Type topographic
	final ArcGISMap mMap = new ArcGISMap(Basemap.Type.TOPOGRAPHIC, 34.056295, -117.195800, 10);
	// set the map to be displayed in this view
	mMapView.setMap(mMap);
	mMapView.setOnTouchListener(new DefaultMapViewOnTouchListener(this, mMapView) {
	@Override
	public boolean onSingleTapConfirmed(MotionEvent motionEvent) {
	Log.d(sTag, "onSingleTapConfirmed: " + motionEvent.toString());
	// get the point that was clicked and convert it to a point in map coordinates
	android.graphics.Point screenPoint = new android.graphics.Point(Math.round(motionEvent.getX()),
	Math.round(motionEvent.getY()));
	// create a map point from screen point
	Point mapPoint = mMapView.screenToLocation(screenPoint);
	// convert to WGS84 for lat/lon format
	Point wgs84Point = (Point) GeometryEngine.project(mapPoint, SpatialReferences.getWgs84());
	// create a textview for the callout
	TextView calloutContent = new TextView(getApplicationContext());
	calloutContent.setTextColor(Color.BLACK);
	calloutContent.setSingleLine();
	// format coordinates to 4 decimal places
	calloutContent.setText("Lat: " +  String.format("%.4f", wgs84Point.getY()) +
	", Lon: " + String.format("%.4f", wgs84Point.getX()));
	// get callout, set content and show
	mCallout = mMapView.getCallout();
	mCallout.setLocation(mapPoint);
	mCallout.setContent(calloutContent);
	mCallout.show();
	// center on tapped point
	mMapView.setViewpointCenterAsync(mapPoint);
	return true;
	}
	});
	}
	@Override
	protected void onPause(){
	super.onPause();
	mMapView.pause();
	}
	@Override
	protected void onResume(){
	super.onResume();
	mMapView.resume();
	}
	}