谷歌地图Android api v2和当前位置

时间：2012-12-12 16:29:55

标签： java android google-maps google-maps-api-2

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： 它需要用户当前位置（使用gps或网络信号） 它从db获得POI 使用方向api，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How to get the current location in Google Maps Android API v2?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，但我无法使用getMyLocation()来了解用户的位置。

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。

这里是我的代码：

清单

<?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" />

它有效但不太好，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）。 enter image description here

如何只显示一个标记？

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，减少所有标记并在地图上重绘它。 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？！

7 个答案:

答案 0 :(得分：6)

您可以致电startPerc.remove();仅删除此标记。

来自here

答案 1 :(得分：4)

为什么不使用startPerc.setPosition移动标记而不是继续添加和删除...

答案 2 :(得分：2)

通过此方法获取另一个位置时设置标记的位置

marker. set position (location)

答案 3 :(得分：1)

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 类的实例。

答案 4 :(得分：0)

您可以用新标记替换标记：

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"));

答案 5 :(得分：0)

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" />

清单文件：

<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;
}

答案 6 :(得分：0)

首先在地图api v2中使用LocationClient检索您的位置，请参阅：http://developer.android.com/training/location/retrieve-current.html

重要提示：要启动API，请在主活动的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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