[英]Google Maps Android api v2 and current location
我正在尝试使用新的谷歌地图android api v2,我正在为Android 2.3.3或更高版本开发一个应用程序。 这是一个非常简单的应用程序:它使用方向api从db获取POI的用户当前位置(使用gps或网络信号),它将用户驱动到POI。
我的问题是获取用户当前位置。 感谢这篇文章如何获取Google Maps Android API v2中的当前位置? 我了解到我无法使用新的谷歌API来更新当前位置。 另一个问题是我可以使用GoogleMap setMyLocationEnabled(boolean enabled)
设置我的位置GoogleMap setMyLocationEnabled(boolean enabled)
但我不能使用getMyLocation()
来知道用户的位置。
我使用本指南http://www.vogella.com/articles/AndroidLocationAPI/article.html#maps_mylocation获取我的位置,并尝试在我的Activity中集成以绘制用户位置。
我的代码:
表现
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="it.mappe"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="it.mappe.permission.MAPS_RECEIVE" />
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="MYGMAPSKEY" />
<activity
android:name="it.mappe.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
主要活动
package it.mappe;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements LocationListener {
private GoogleMap map;
private static final LatLng ROMA = new LatLng(42.093230818037,11.7971813678741);
private LocationManager locationManager;
private String provider;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabledGPS = service
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean enabledWiFi = service
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
// Check if enabled and if not send user to the GSP settings
// Better solution would be to display a dialog and suggesting to
// go to the settings
if (!enabledGPS) {
Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
Toast.makeText(this, "Selected Provider " + provider,
Toast.LENGTH_SHORT).show();
onLocationChanged(location);
} else {
//do something
}
}
/* Request updates at startup */
@Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
double lat = location.getLatitude();
double lng = location.getLongitude();
Toast.makeText(this, "Location " + lat+","+lng,
Toast.LENGTH_LONG).show();
LatLng coordinate = new LatLng(lat, lng);
Toast.makeText(this, "Location " + coordinate.latitude+","+coordinate.longitude,
Toast.LENGTH_LONG).show();
Marker startPerc = map.addMarker(new MarkerOptions()
.position(coordinate)
.title("Start")
.snippet("Inizio del percorso")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)));
}
@Override
public void onProviderDisabled(String provider) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderEnabled(String provider) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
主要布局
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
它工作但不太好,你可以在图片中看到eveytime有一个新的位置它添加了一个新的标记(ex Overlay我认为......我从不使用旧的谷歌地图api)。
我怎样才能只显示一个标记?
另外在我的地图上我还需要显示POI的标记,所以我认为这不是一个好的解决方案,所有标记都要降低并在地图上重绘。 还有另一种获取用户当前位置的最佳方法,每次只显示一个自定义标记时更新它?!
你可以调用startPerc.remove();
仅删除此标记。
从这里开始
为什么不使用startPerc.setPosition
来移动标记而不是继续添加和删除...
通过此方法获取其他位置时设置标记的位置
marker. set position (location)
您应该在添加标记之前使用googlemap.clear() ,因为每次更改位置时,都会在地图上添加最新标记的新标记。 所以在更改位置之前添加标记之前使用googlemap.clear()。 它将删除最旧的标记并添加新标记。 googlemap是GoogleMap Class的实例。
您可以用新的标记替换标记:
if(userMarker!=null) userMarker.remove();
userMarker = theMap.addMarker(new MarkerOptions()
.position(lastLatLng)
.title("You are here")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.your_loc_icon))
.snippet("Your current location"));
在android中定义Google Map android v2的完整快捷方式......
XML文件:
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
清单档案:
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!-- Map permission Starts -->
<permission
android:name="com.example.mapdemoapiv2.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.mapdemoapiv2.permission.MAPS_RECEIVE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<!-- Map permission Starts -->
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.mapdemoapiv2.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MapDetail" >
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="Your Key" />
<uses-library android:name="com.google.android.maps" />
</application>
活动类:
public class MainActivity extends android.support.v4.app.FragmentActivity
{
GoogleMap googleMap;
MarkerOptions markerOptions;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpMapIfNeeded();
GetCurrentLocation();
}
private void setUpMapIfNeeded() {
if (googleMap == null) {
Log.e("", "Into null map");
googleMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
googleMap.setInfoWindowAdapter(new CustomInfoWindowAdapter(
MainActivity.this));
if (googleMap != null) {
Log.e("", "Into full map");
googleMap.setMapType(googleMap.MAP_TYPE_NORMAL);
googleMap.getUiSettings().setZoomControlsEnabled(false);
}
}
}
private void GetCurrentLocation() {
double[] d = getlocation();
Share.lat = d[0];
Share.lng = d[1];
googleMap
.addMarker(new MarkerOptions()
.position(new LatLng(Share.lat, Share.lng))
.title("Current Location")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.dot_blue)));
googleMap
.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(Share.lat, Share.lng), 5));
}
public double[] getlocation() {
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
List<String> providers = lm.getProviders(true);
Location l = null;
for (int i = 0; i < providers.size(); i++) {
l = lm.getLastKnownLocation(providers.get(i));
if (l != null)
break;
}
double[] gps = new double[2];
if (l != null) {
gps[0] = l.getLatitude();
gps[1] = l.getLongitude();
}
return gps;
}
首先在map api v2中使用LocationClient来检索您的位置,请参阅: http : //developer.android.com/training/location/retrieve-current.html
Iportant:启动API,在主Activity的onStart中调用它:
private void kickStardedLocationManager(){
// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
android.location.LocationListener locationListener = new android.location.LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
//MainActivity.this.makeUseOfNewLocation(location);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
long l = 10;
float f = 100;
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); //LocationManager.GPS_PROVIDER
}
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