我是Android编程的新手。我正在开发一个需要访问Google地图的Android项目。我的导航抽屉里有几个选项，包括谷歌地图位置。
因此，每当我第一次尝试加载地图时，它都能正常工作并加载具有当前GPS位置并定义了MAP TYPE的地图。
但每当我尝试切换到其他片段并返回Map时 片段，GPS功能和地图类型都不起作用。
需要帮助。提前致谢。我正在尝试修复它。 :)
我的代码如下。
我在这里尝试做的是每当用户触摸某个地方时，a 标记将放在该位置。
public class AddCustomerLocationFragment extends Fragment implements
LocationListener {
private MapView mapView;
private GoogleMap map;
private Marker marker;
private boolean markerAvailable;
private Bundle bundle;
Button btnReset, btnSetLocation;
LocationManager locationManager;
private View view;
private double[] addCustomerLocation = new double[10];
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_addcustomer_location,
container, false);
MapsInitializer.initialize(getActivity());
mapView = (MapView) v.findViewById(R.id.map);
btnReset = (Button) v.findViewById(R.id.btnReset);
btnSetLocation = (Button) v.findViewById(R.id.btnSetLocation);
mapView.onCreate(bundle);
map.setMyLocationEnabled(true);
locationManager = (LocationManager) getActivity()
.getSystemService(
Context.LOCATION_SERVICE);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
getGPS();
} else {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 1000, 10, this);
}
map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
map.getUiSettings().setMyLocationButtonEnabled(true);
map.getUiSettings().setCompassEnabled(true);
map.setOnMapClickListener(new OnMapClickListener() {
public void onMapClick(LatLng point) {
Toast.makeText(
getActivity(),
"Latitude:" + point.latitude + ", Longitude:"
+ point.longitude, Toast.LENGTH_SHORT).show();
addMarker(point);
markerAvailable = true;
}
});
btnSetLocation.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(
getActivity(),
"Your current loaction is set to: Latitude:"
+ addCustomerLocation[0] + ", Longitude:"
+ addCustomerLocation[1], Toast.LENGTH_SHORT)
.show();
}
});
btnReset.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
marker.remove();
Toast.makeText(getActivity(), "Marker is Reset",
Toast.LENGTH_SHORT).show();
markerAvailable = false;
}
});
// add a marker
//
return v;
}
private void getGPS() {
// TODO Auto-generated method stub
onLocationChanged(locationManager
.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER));
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bundle = savedInstanceState;
setRetainInstance(true);
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
getGPS();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
private void outGPS() {
// TODO Auto-generated method stub
locationManager.removeUpdates(this);
}
@Override
public void onDestroy() {
mapView.onDestroy();
super.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
// @Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
LatLng latLng = null;
if (!markerAvailable) {
latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(
latLng, 18f);
map.animateCamera(cameraUpdate);
addMarker(latLng);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(final String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
private void addMarker(LatLng point) {
map.clear();
marker = map.addMarker(new MarkerOptions().position(
new LatLng(point.latitude, point.longitude)).title(
"Your Location!?"));
}
}
答案 0 :(得分：0)
以下是在片段中显示Google地图的代码。我已经使用LongClickListeners在地图上放置标记，您可以将其更改为onClick。
public class LocationFragment extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// inflat and return the layout
View v = inflater.inflate(R.layout.fragment_location, container, false);
mMapView = (MapView) v.findViewById(R.id.map);
mMapView.onCreate(savedInstanceState);
mMapView.onResume();// needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
googleMap = mMapView.getMap();
setUpMap();
addingMarkers();
addingCircles();
setOnLongClickListenerForAddingNewMarkers();
return v;
}
private void setUpMap() {
// To show my location button on Google maps
googleMap.setMyLocationEnabled(true);
LocationManager locationManager = MainActivity.locationManager;
Criteria criteria = new Criteria();
final Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
if (location != null) {
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location.getLongitude()), 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(location.getLatitude(), location.getLongitude())) // Sets the center of the map to location user
.zoom(17) // Sets the zoom
.bearing(90) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
}
private void addingMarkers() {
// Adding marker to locations - This is a marker for Shipra Mall, which is close to my house. Zoom out to see the Marker
double latitude = 28.6322269;
double longitude = 77.3671697;
// create marker
MarkerOptions marker = new MarkerOptions().position(
new LatLng(latitude, longitude)).title("Shipra Mall");
// Changing marker icon
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
googleMap.addMarker(marker);
// End - Adding marker to location
// Another marker for District Center in Janakpuri
double latitude2 = 28.6292303;
double longitude2 = 77.0805496;
MarkerOptions marker2 = new MarkerOptions().position(
new LatLng(latitude2, longitude2)).title("District Center");
marker2.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
googleMap.addMarker(marker2);
// End - Another marker for District Center in Janakpuri
}
private void addingCircles() {
// Latitude and Longitude of Pacific Mall Subash Nagar
double latitude = 28.6438947;
double longitude = 77.1128296;
// Adding a circle around Pacific Mall of 1000 meters radius.
googleMap.addCircle(new CircleOptions()
.center(new LatLng(latitude, longitude)) // Setting center point
.radius(1000) // In meters
.strokeColor(Color.RED) // Color of Border of Circle
.fillColor(R.color.semi_blue) // Colour of fill, I've set the color to semi transparent blue which I've defined in colors.xml. For fill colour always use semi transparent colour.
.strokeWidth(10)); // Width of red border.
}
private void setOnLongClickListenerForAddingNewMarkers() {
googleMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
@Override
public void onMapLongClick(LatLng latLng) {
// This method will add a new marker to wherever the user long clicks on the Map.
// The title of the marker will be set based on what is located at that location.
// The Geocoder.getFromLocation() method gets the address and details of the location.
// Find Details of location
Geocoder geocoder;
List<Address> addresses = null;
geocoder = new Geocoder(getActivity().getApplicationContext(), Locale.getDefault());
try {
addresses = geocoder.getFromLocation(latLng.latitude, latLng.longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
assert addresses != null;
String address = addresses.get(0).getAddressLine(0);
String city = addresses.get(0).getLocality();
String state = addresses.get(0).getAdminArea();
String country = addresses.get(0).getCountryName();
String postalCode = addresses.get(0).getPostalCode();
String knownName = addresses.get(0).getFeatureName();
// End - Find details of location
// Add the new marker to the map
MarkerOptions mo = new MarkerOptions();
mo.position(latLng);
mo.title(knownName + ", " + address + ", " + city + ", " + state + ", " + country);
mo.icon(BitmapDescriptorFactory
.defaultMarker(new Random().nextFloat() * 360));
googleMap.addMarker(mo);
}
});
}
@Override
public void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
}
然后我将此片段添加到我的MainActivity中。
您需要为清单添加一些权限，并指定您的Google Maps API密钥。清单文件是：
<?xml version="1.0" encoding="utf-8"?>
<manifest package="YOUR_PACKAGE"
xmlns:android="http://schemas.android.com/apk/res/android">
<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 ACCESS_COARSE/FINE_LOCATION 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"/>
<permission
android:name="com.arshad.map.permission.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<!-- Permission to receive Google Maps -->
<uses-permission android:name="com.arshad.map.permission.MAPS_RECEIVE"/>
<!-- Maps API needs OpenGL ES 2.0. -->
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<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="@string/google_maps_key"/>
<activity
android:name=".MainActivity"
android:label="@string/title_activity_main">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
你很高兴。