当我运行应用程序时，它会加载地图但不会加载我当前的位置。当我点击gps之后，它会放大到我当前的位置。我还想在用户从一个位置移动到另一个位置时更新位置。此位置更新代码无法正常工作。当我改变设备的方向时，它会再次重新加载地图。事情再次发生。
Xml文件
<?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"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
类文件
package com.design.googlemap;
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 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{
private GoogleMap googlemap;
private LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SetMapIfNeeded();
}
private void SetMapIfNeeded() {
// TODO Auto-generated method stub
if(googlemap==null){
//try to obtain google map form SupportMapFragment;
googlemap=((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
if(googlemap!= null){
SetUpMap();
}
}
}
private void SetUpMap() {
// Enable MyLocation Layer of Google Map
googlemap.setMyLocationEnabled(true);
// Get LocationManager object from System Service Location_SERVICE
locationManager =(LocationManager) getSystemService(LOCATION_SERVICE);
//Create a criteria object to retrieve provider
Criteria criteria= new Criteria();
//Get the name of the best provider
String provider = locationManager.getBestProvider(criteria,true);
//Get Current Location
Location myLocation= locationManager.getLastKnownLocation(provider);
//Set map type
googlemap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
//Get Latitude object of current location
double latitude=myLocation.getLatitude();
//Get Latitude object of current location
double longitude=myLocation.getLatitude();
//Create a LatLng object for current location
LatLng latLng = new LatLng(latitude,longitude);
//show the current location of Google Map
googlemap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
LocationListener listner = new LocationListener() {
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
locationManager =(LocationManager) getSystemService(LOCATION_SERVICE);
}
};
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, (LocationListener) listner);
}
@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;
}
}
ManifestFile
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.design.googlemap"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="17" />
<permission
android:name="com.design.googlemap.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<!--
The following two permissions are not required to use
Google Maps Android API v2, but are recommended.
-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.design.googlemap.permission.MAPS_RECEIVE" />
<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="com.design.googlemap.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.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="XXXXXXXXXXXXXXXXXXXXXXXXXXXX" />
</application>
</manifest>
答案 0 :(得分：1)
此处的快速信息（该文章的其余部分也可能有用）：
http://www.vogella.com/articles/AndroidLocationAPI/article.html#maps_mylocation
使用MyLocationOverlay，因为它就是这样的。使用MyLocationOverlay和自定义叠加层的Here is a sample application;如果你不需要，你可以随时摆脱自定义的。
将此行添加到AndroidManifest.xml。这告诉系统您将自己处理哪些配置更改 - 在这种情况下无需执行任何操作。
android:configChanges="keyboardHidden|orientation|screenSize"
答案 1 :(得分：1)
//Get the name of the best provider
String provider = locationManager.getBestProvider(criteria,false);
即使Gps如果关闭。您的大致位置将被指向。
对于GoogleMaps上的locationUpdates，请查看此link
同样，为了缩放到特定位置，请添加以下代码：
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(YOUR_LATLNG).zoom(ZOOM_LEVEL).build(); // int ZOOM_LEVEL=12
map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
详细了解link有关缩放的详情。
要隐藏WebView，请调用活动中的“可见性”功能[按下按钮]
WebView wv=(WebView)findViewById(R.id.YOUR_WEB_VIEW);
wv.setVisibility(View.GONE);// when you want to hide[shrink]
wv.setVisibility(View.VISIBLE);// when you want to Show[Zoom]