[英]android + google map api v2 + current location
我正在使用谷歌地圖視圖創建一個應用程序,我希望這個應用程序檢測用戶的當前位置,並在地圖上顯示lat和long標記,但我現在所能做的只是顯示谷歌地圖和在沒有顯示任何標記且沒有任何文本的情況下檢測當前位置似乎顯示lat和long
我直到現在才添加標記,因為我不知道將其放在代碼中的哪個位置以及執行此操作的最佳做法是什么
誰能幫我 ??? 這是代碼:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="in.wptrafficanalyzer.locationgooglemapv2demo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<permission
android:name="in.wptrafficanalyzer.LocationGoogleMapV2Demo.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="in.wptrafficanalyzer.LocationGoogleMapV2Demo.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<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" >
<activity
android:name="in.wptrafficanalyzer.locationgooglemapv2demo.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>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="API KEY" />
</application>
</manifest>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="@+id/tv_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
package in.wptrafficanalyzer.locationgooglemapv2demo;
import android.app.Dialog;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
public class MainActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
// Showing status
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}else { // Google Play Services are available
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
}
}
@Override
public void onLocationChanged(Location location) {
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude = location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
// Showing the current location in Google Map
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
// Setting latitude and longitude in the TextView tv_location
tvLocation.setText("Latitude:" + latitude + ", Longitude:"+ longitude );
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
首先查看此處的文檔,它可以很好地指示獲取用戶位置的最佳策略。
就個人而言,我通常會在地圖上放置一個標記,並將其放置在經過重新檢查的位置
Location lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
然后我開始聽取位置更新並移動標記。
它還取決於您的應用程序所需的准確位置,如果您不需要真正准確的位置但面積足夠,也許您可以使用lastKnownLocation
。
你可以嘗試這樣的事情
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting Google Play availability status
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
// Showing status
if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available
int requestCode = 10;
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
dialog.show();
}else { // Google Play Services are available
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
LocationListener locationListener = new LocationListener() {
void onLocationChanged(Location location) {
// redraw the marker when get location update.
drawMarker(location);
}
if(location!=null){
//PLACE THE INITIAL MARKER
drawMarker(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, locationListener);
}
}
private void drawMarker(Location location){
// Remove any existing markers on the map
googleMap.clear();
LatLng currentPosition = new LatLng(location.getLatitude(),location.getLongitude());
googleMap.addMarker(new MarkerOptions()
.position(currentPosition)
.snippet("Lat:" + location.getLatitude() + "Lng:"+ location.getLongitude())
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE))
.title("ME"));
}
此外,您不需要Activity類來implements LocationListener
,您可以像上面一樣定義一個偵聽器並注冊它
PS我沒有編輯兒子我的代碼可以包含拼寫錯誤
希望這會有所幫助,歡呼
我遇到了同樣的問題,並找到了使用Google Maps API執行此操作的方法:
private GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location location) {
LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
mMarker = mMap.addMarker(new MarkerOptions().position(loc));
if(mMap != null){
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
}
}
};
然后為地圖設置監聽器:
mMap.setOnMyLocationChangeListener(myLocationChangeListener);
當地圖首次找到該位置時,將調用此方法。
根本不需要LocationService
或LocationManager
。
在android中定義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" />
清單檔案:
<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>
活動類:
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;
}
最好使用:
Location currentLocation =
LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
很容易:
在這之后 -
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="Your Key" />
把這個 -
<meta-data android:name="com.google.android.gms.version" android:value="4030500" />
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