Arcgis For Android之GPS定位实现

翻开曾经做的东西，看了看，非常多从逻辑上比較乱，对之做了改动，完毕后实现的效果为：

MapActivity源码例如以下：

package com.lzugis.map;

import java.io.File;
import java.util.Iterator;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.GpsSatellite;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.os.Environment;
import android.provider.Settings;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.esri.android.map.GraphicsLayer;
import com.esri.android.map.MapView;
import com.esri.android.map.ags.ArcGISLocalTiledLayer;
import com.esri.android.runtime.ArcGISRuntime;
import com.esri.core.geometry.GeometryEngine;
import com.esri.core.geometry.Point;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.map.Graphic;
import com.esri.core.symbol.PictureMarkerSymbol;
import com.lzugis.tool.ZoomCtrl;

public class MapActivity extends Activity {
	private static File dataFile;
	private static String dirName;
	private static String filename;	

	private LocationListener locationListener = new LocationListener(){
  		/**
         * 位置信息变化时触发
         */
    	public void onLocationChanged(Location location) {
			markLocation(location);
		}
    	/**
         * 状态改变时调用
         */
		public void onStatusChanged(String provider, int status, Bundle extras)
		{
			switch (status) {
            //GPS状态为可见时
            case LocationProvider.AVAILABLE:
            	showToast("当前GPS状态为可见状态");
                Log.i("TAG", "当前GPS状态为可见状态");
                break;
            //GPS状态为服务区外时
            case LocationProvider.OUT_OF_SERVICE:
            	showToast("当前GPS状态为服务区外状态");
                Log.i("TAG", "当前GPS状态为服务区外状态");
                break;
            //GPS状态为暂停服务时
            case LocationProvider.TEMPORARILY_UNAVAILABLE:
            	showToast("当前GPS状态为暂停服务状态");
                Log.i("TAG", "当前GPS状态为暂停服务状态");
                break;
            }
		}
		/**
         * GPS开启时触发
         */
		public void onProviderEnabled(String provider)
		{
			showToast("GPS打开");
			Location location=locMag.getLastKnownLocation(provider);
			markLocation(location);
		}
		/**
         * GPS禁用时触发
         */
		public void onProviderDisabled(String provider)
		{
			showToast("GPS已关闭");
		}
	};

	MapView mapview;
	ArcGISLocalTiledLayer local;
	ZoomCtrl zoomCtrl;
	GraphicsLayer gLayerGps;

	Button btnPosition;
	Toast toast;
	LocationManager locMag;
	Location loc ;	

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_map);
        //去除水印
        ArcGISRuntime.setClientId("1eFHW78avlnRUPHm");

        //要定位在地图中的位置，须要知道当前位置，而当前位置有Location对象决定，
        //可是，Location对象又须要LocationManager对象来创建。
        //创建LocationManager的唯一方法
        locMag = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

        mapview = (MapView)findViewById(R.id.map);
        dataFile = Environment.getExternalStorageDirectory();
        dirName = this.getResources().getString(R.string.offline_dir);
	filename = this.getResources().getString(R.string.local_tpk);

	String basemap = "file://"+dataFile + File.separator +dirName + File.separator + filename;
    	local = new ArcGISLocalTiledLayer(basemap);
    	mapview.addLayer(local);

    	//放大与缩小
    	zoomCtrl = (ZoomCtrl) findViewById(R.id.ZoomControl);
    	zoomCtrl.setMapView(mapview);

    	gLayerGps = new GraphicsLayer();
	    mapview.addLayer(gLayerGps);

	    btnPosition=(Button)findViewById(R.id.btnPosition);
	    btnPosition.setOnClickListener(new OnClickListener(){
	    	public void onClick(View v) {
	    		//推断GPS是否正常启动
	            if(!locMag.isProviderEnabled(LocationManager.GPS_PROVIDER)){
	                showToast("请开启GPS导航...");
	                //返回开启GPS导航设置界面
	                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
	                startActivityForResult(intent,0);
	                return;
	            }
	            Location location= locMag.getLastKnownLocation(LocationManager.GPS_PROVIDER);
	            markLocation(location);
	            locMag.addGpsStatusListener(listener);
	    		locMag.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, locationListener);
	    	}
	    });
    }

    //状态监听
    GpsStatus.Listener listener = new GpsStatus.Listener() {
        public void onGpsStatusChanged(int event) {
            switch (event) {
            //第一次定位
            case GpsStatus.GPS_EVENT_FIRST_FIX:
                Log.i("TAG", "第一次定位");
                break;
            //卫星状态改变
            case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                Log.i("TAG", "卫星状态改变");
                //获取当前状态
                GpsStatus gpsStatus=locMag.getGpsStatus(null);
                //获取卫星颗数的默认最大值
                int maxSatellites = gpsStatus.getMaxSatellites();
                //创建一个迭代器保存全部卫星
                Iterator<GpsSatellite> iters = gpsStatus.getSatellites().iterator();
                int count = 0;
                while (iters.hasNext() && count <= maxSatellites) {
                    GpsSatellite s = iters.next();
                    count++;
                }
                System.out.println("搜索到："+count+"颗卫星");
                break;
            //定位启动
            case GpsStatus.GPS_EVENT_STARTED:
                Log.i("TAG", "定位启动");
                break;
            //定位结束
            case GpsStatus.GPS_EVENT_STOPPED:
                Log.i("TAG", "定位结束");
                break;
            }
        };
    };

    private void markLocation(Location location)
	{
    	if(location!=null){
	    	Log.i("TAG", "时间："+location.getTime());
	        Log.i("TAG", "经度："+location.getLongitude());
	        Log.i("TAG", "纬度："+location.getLatitude());
	        Log.i("TAG", "海拔："+location.getAltitude());
			double locx = location.getLongitude();
			double locy = location.getLatitude();
			ShowPointOnMap(locx,locy);
    	}
	}

    public void ShowPointOnMap(double lon,double lat){
		//清空定位图层
		gLayerGps.removeAll();
		//接收到的GPS的信号X(lat),Y(lon)
		double locx = lon;
		double locy = lat;
		Point wgspoint = new Point(locx, locy);
		Point mapPoint = (Point) GeometryEngine.project(wgspoint,SpatialReference.create(4326),mapview.getSpatialReference());
		//图层的创建
//		Graphic graphic = new Graphic(mapPoint,new SimpleMarkerSymbol(Color.RED,18,STYLE.CIRCLE));
		PictureMarkerSymbol pms =  new PictureMarkerSymbol(this.getResources().getDrawable(
				R.drawable.location));
		Graphic graphic = new Graphic(mapPoint,pms);
		gLayerGps.addGraphic(graphic);
	}

    private void showToast(String msg)
	{
        if(toast == null)
        {
        	toast = Toast.makeText(this, msg, Toast.LENGTH_SHORT);
        }
        else
        {
        	toast.setText(msg);
        	toast.setDuration(Toast.LENGTH_SHORT);
        }
        toast.setGravity(Gravity.BOTTOM, 0, 0);
        toast.show();
    } 

	@Override
	protected void onDestroy() {
		super.onDestroy();
	}
	@Override
	protected void onPause() {
		super.onPause();
		mapview.pause();
	}
	@Override
	protected void onResume() {
		super.onResume();
		mapview.unpause();
	}
}