MapActivity in Android 4 - GPS

You can use GPS in Android. Here is a demo for driving around Google by using GPS.

MapActivity亦可使用GPS定位Google map，不過目前透過內部模擬在Google附近開車的GPS資料進行模擬。

1. mapdemo.java：再將上一篇的程式碼主要加上籃色部份，透過LocationManager使用GPS定位，選單增加GPS項目，P為定位、G為到選單。

package com.test.demo; import java.util.List; import com.google.android.maps.MapActivity; import android.app.Activity; import android.location.Location; import android.location.LocationManager; import android.location.LocationProvider; import android.os.Bundle; import android.view.KeyEvent; import android.widget.ArrayAdapter; import android.widget.Spinner; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import com.google.android.maps.Point; import android.location.Location; import android.location.LocationManager; import android.location.LocationProvider; public class mapdemo extends MapActivity{ /** Called when the activity is first created. */ public static final int change = 3000; private MapView mapView; private MapController mapConrtoller; private Spinner s1; private LocationManager locMan; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); s1 = (Spinner) findViewById(R.id.spinner1); Spinner s1 = (Spinner) findViewById(R.id.spinner1); ArrayAdapter adapter = ArrayAdapter.createFromResource( this, R.array.city, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); s1.setAdapter(adapter); //It seems a bug for LocationManager,we can't get location in first time. getLocation(); mapView =(MapView) findViewById(R.id.my_map); mapConrtoller = mapView.getController(); mapConrtoller.zoomTo(17); updateView(); } private void getLocation(){ Location loc; LocationProvider locPro; List proList; locMan = (LocationManager)this.getSystemService(Activity.LOCATION_SERVICE); proList = locMan.getProviders(); locPro = proList.get(0); loc = locMan.getCurrentLocation("gps"); Double lat = 0.0; Double lon = 0.0; lat = (Double)loc.getLatitude()*1E6; lon = (Double)loc.getLongitude()*1E6; Point point = new Point(lat.intValue(),lon.intValue()); if(lat.intValue()!=0 && lon.intValue()!=0){ mapConrtoller.animateTo(point); } } public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_I) { mapView.requestFocus(); // zoom in mapView.getController().zoomTo(mapView.getZoomLevel() + 1); return true; } else if (keyCode == KeyEvent.KEYCODE_P) { // position Double lat=0.0; Double lng=0.0; if(s1.getSelectedItemIndex()==0){ lat = 25.08421662*1E6; lng = 121.5588632*1E6; }else if(s1.getSelectedItemIndex()==1){ lat = 25.156109*1E6; lng = 121.695457*1E6; }else if(s1.getSelectedItemIndex()==2){ lat = 25.02723286*1E6; lng = 121.4777282*1E6; }else if(s1.getSelectedItemIndex()==3){ lat = 24.766944444*1E6; lng = 121.758333333*1E6; }else if(s1.getSelectedItemIndex()==4){ lat = 24.7952904064701*1E6; lng = 121.005980402031*1E6; }else if(s1.getSelectedItemIndex()==5){ lat = 25.01049145*1E6; lng = 121.2988981*1E6; }else if(s1.getSelectedItemIndex()==6){ lat = 24.6929396881103*1E6; lng = 120.916988073054*1E6; }else if(s1.getSelectedItemIndex()==7){ lat = 24.165632*1E6; lng = 120.640234*1E6; }else if(s1.getSelectedItemIndex()==8){ lat = 24.085467449249*1E6; lng = 120.53489812506*1E6; }else if(s1.getSelectedItemIndex()==9){ lat = 23.831933886322*1E6; lng = 120.71674349869*1E6; }else if(s1.getSelectedItemIndex()==10){ lat = 23.4670607206971*1E6; lng = 120.424347942069*1E6; }else if(s1.getSelectedItemIndex()==11){ lat = 23.68080782*1E6; lng = 120.4857101*1E6; }else if(s1.getSelectedItemIndex()==12){ lat = 23.015307619667*1E6; lng = 120.19802892001*1E6; }else if(s1.getSelectedItemIndex()==13){ lat = 22.6516357159836*1E6; lng = 120.305947184541*1E6; } else if(s1.getSelectedItemIndex()==14){ lat = 22.568397*1E6; lng = 120.539828*1E6; } else if(s1.getSelectedItemIndex()==15){ lat = 22.736944444*1E6; lng = 121.122777778*1E6; }else if(s1.getSelectedItemIndex()==16){ lat = 23.973333333*1E6; lng = 121.588055556*1E6; }else if(s1.getSelectedItemIndex()==16){ lat = 23.973333333*1E6; lng = 121.588055556*1E6; }else if(s1.getSelectedItemIndex()==17){ getLocation(); } Point point = new Point(lat.intValue(), lng.intValue()); mapConrtoller.centerMapTo(point, false); mapView.requestFocus(); return true; }else if (keyCode == KeyEvent.KEYCODE_G) { // zoom out s1.requestFocus(); return true; }else if (keyCode == KeyEvent.KEYCODE_O) { mapView.requestFocus(); // zoom out mapView.getController().zoomTo(mapView.getZoomLevel() - 1); return true; } else if (keyCode == KeyEvent.KEYCODE_S) { mapView.requestFocus(); // Satellite,衛星地图 if(!mapView.isSatellite()){ mapView.toggleSatellite(); } return true; } else if (keyCode == KeyEvent.KEYCODE_M) { mapView.requestFocus(); // traffic，路况 if(mapView.isSatellite()){ mapView.toggleSatellite(); } return true; } else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) { mapView.requestFocus(); Double lat = mapView.getMapCenter().getLatitudeE6()/1.0; Double lng = mapView.getMapCenter().getLongitudeE6()/1.0; lat=lat+change; Point point = new Point(lat.intValue(),lng.intValue()); mapConrtoller.animateTo(point); return true; } else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) { mapView.requestFocus(); Double lat = mapView.getMapCenter().getLatitudeE6()/1.0; Double lng = mapView.getMapCenter().getLongitudeE6()/1.0; lat=lat-change; Point point = new Point(lat.intValue(),lng.intValue()); mapConrtoller.animateTo(point); return true; } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) { mapView.requestFocus(); Double lat = mapView.getMapCenter().getLatitudeE6()/1.0; Double lng = mapView.getMapCenter().getLongitudeE6()/1.0; lng=lng-change; Point point = new Point(lat.intValue(),lng.intValue()); mapConrtoller.animateTo(point); return true; } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) { mapView.requestFocus(); Double lat = mapView.getMapCenter().getLatitudeE6()/1.0; Double lng = mapView.getMapCenter().getLongitudeE6()/1.0; lng=lng+change; Point point = new Point(lat.intValue(),lng.intValue()); mapConrtoller.animateTo(point); return true; } return false; } private void updateView(){ Double lat = 25.025708*1E6; Double lng = 121.526403*1E6; Point point = new Point(lat.intValue(), lng.intValue()); mapConrtoller.centerMapTo(point, false); } }

2. arrays.xml：加上GPS項目。

<?xml version="1.0" encoding="utf-8"?> <resources> <array name="city"> <item>台北市</item> <item>基隆市</item> <item>台北縣</item> <item>宜蘭縣</item> <item>新竹市</item> <item>桃園市</item> <item>苗栗縣</item> <item>台中市</item> <item>彰化縣</item> <item>南投縣</item> <item>嘉義市</item> <item>雲林縣</item> <item>臺南市</item> <item>高雄市</item> <item>屏東縣</item> <item>臺東縣</item> <item>花蓮縣</item> <item>GPS</item> </array> </resources>