Android 使用onConnected()显示最后一个已知位置
我正试图借助Android 使用onConnected()显示最后一个已知位置,android,google-maps,Android,Google Maps,我正试图借助GoogleAppClient到达最后一个已知位置,我遵循了链接中的指南: 我已经在下面测试了我的代码,并且调用了buildGoogleAppClient(),但没有调用onConnected()。因此,不显示最后已知的位置 谷歌地图正在显示 如何使用此方法获取最后一个已知位置 地图活动: public class Map extends FragmentActivity implements OnMapReadyCallback, ConnectionCallbacks, OnC
GoogleAppClient
到达最后一个已知位置,我遵循了链接中的指南:
我已经在下面测试了我的代码,并且调用了buildGoogleAppClient()
,但没有调用onConnected()
。因此,不显示最后已知的位置
谷歌地图正在显示
如何使用此方法获取最后一个已知位置
地图活动:
public class Map extends FragmentActivity implements OnMapReadyCallback, ConnectionCallbacks, OnConnectionFailedListener{
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
buildGoogleApiClient();
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
System.out.println("ABC buildGoogleApiClient map was invoked: ");
}
@Override
public void onConnected(Bundle arg0) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
double lng = mLastLocation.getLongitude();
double lat = mLastLocation.getLatitude();
if(myLocatMarker != null){
myLocatMarker.remove();
}
LatLng ll = new LatLng(lat, lng);
MarkerOptions markerOpt = new MarkerOptions().title("my location")
.position(ll)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.myloc));
System.out.println("ABC onConnected map: "+ lat + " ; " + lng);
myLocatMarker = map.addMarker(markerOpt);
}
}
}
编辑地图活动:
public class Map extends FragmentActivity implements OnMapReadyCallback, ConnectionCallbacks, OnConnectionFailedListener{
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
buildGoogleApiClient();
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
System.out.println("ABC buildGoogleApiClient map was invoked: ");
}
@Override
public void onConnected(Bundle arg0) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
double lng = mLastLocation.getLongitude();
double lat = mLastLocation.getLatitude();
if(myLocatMarker != null){
myLocatMarker.remove();
}
LatLng ll = new LatLng(lat, lng);
MarkerOptions markerOpt = new MarkerOptions().title("my location")
.position(ll)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.myloc));
System.out.println("ABC onConnected map: "+ lat + " ; " + lng);
myLocatMarker = map.addMarker(markerOpt);
}
}
}
公共类映射扩展了FragmentActivity在MapreadyCallback、ConnectionCallbacks和OnConnectionFailedListener上的实现{
谷歌地图;
GoogleapClient MGoogleapClient;
位置mLastLocation;
标记;定位标记
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
buildGoogleApiClient();
}
@Override
public void onMapReady(GoogleMap arg0) {
mGoogleApiClient.connect();
System.out.println("ABC onMapReady");
}
private boolean initMap() {
if (map == null) {
SupportMapFragment mapFrag = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
map = mapFrag.getMap();
}
return (map != null);
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
@SuppressWarnings("unchecked")
ArrayList<ItemDTO> list = (ArrayList<ItemDTO>) intent
.getSerializableExtra("list_data");
for (ItemDTO itemDTO : list) {
int id = itemDTO.getBusId();
double latitude = itemDTO.getLatitude();
double longitude = itemDTO.getLongitude();
int route1 = itemDTO.getRoute();
String route = Integer.toString(route1);
String direction = itemDTO.getDirection();
String route_dirc = route + ", " + direction;
if (initMap()) {
gotoLocation(id, latitude, longitude, route_dirc);
} else {
Toast.makeText(this, "Map not avialable", Toast.LENGTH_SHORT)
.show();
}
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
System.out.println("ABC buildGoogleApiClient map was invoked: ");
}
@Override
public void onConnected(Bundle arg0) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
double lng = mLastLocation.getLongitude();
double lat = mLastLocation.getLatitude();
if(myLocatMarker != null){
myLocatMarker.remove();
}
LatLng ll = new LatLng(lat, lng);
MarkerOptions markerOpt = new MarkerOptions().title("my location")
.position(ll)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.myloc));
System.out.println("ABC onConnected map: "+ lat + " ; " + lng);
myLocatMarker = map.addMarker(markerOpt);
}
}
}
@覆盖
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
SupportMapFragment mapFragment=(SupportMapFragment)getSupportFragmentManager()
.findFragmentById(R.id.map);
getMapAsync(这个);
buildGoogleAppClient();
}
@凌驾
mapready上的公共无效(谷歌地图arg0){
mGoogleApiClient.connect();
System.out.println(“ABC onMapReady”);
}
私有布尔initMap(){
if(map==null){
SupportMapFragment MapFragment=(SupportMapFragment)getSupportFragmentManager()
.findFragmentById(R.id.map);
map=mapFrag.getMap();
}
返回(map!=null);
}
@凌驾
受保护的void onNewIntent(意图){
super.onNewIntent(意向);
@抑制警告(“未选中”)
ArrayList list=(ArrayList)intent
.getSerializableExtra(“列表数据”);
for(ItemDTO ItemDTO:list){
int id=itemDTO.getBusId();
双纬度=itemDTO.getLatitude();
double longitude=itemDTO.getLongitude();
int route1=itemDTO.getRoute();
字符串route=Integer.toString(route1);
字符串方向=itemDTO.getDirection();
字符串route_dirc=route+“,”+方向;
if(initMap()){
地理位置(id、纬度、经度、路线);
}否则{
Toast.makeText(此“地图不可导航”,Toast.LENGTH\u SHORT)
.show();
}
}
}
受保护的同步无效BuildGoogleAppClient(){
mgoogleapclient=新的Googleapclient.Builder(此)
.addConnectionCallbacks(此)
.addOnConnectionFailedListener(此)
.addApi(LocationServices.API)
.build();
println(“调用了ABC BuildGoogleAppClient映射:”);
}
@凌驾
未连接的公共空间(捆绑arg0){
mLastLocation=LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
如果(mLastLocation!=null){
double lng=mLastLocation.getLongitude();
双lat=mLastLocation.getLatitude();
如果(myLocatMarker!=null){
mylocatemarker.remove();
}
LatLng ll=新LatLng(lat,lng);
MarkerOptions markerOpt=新的MarkerOptions().title(“我的位置”)
.职位(ll)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.myloc));
System.out.println(“ABC连接图:“+lat+”;“+lng”);
myLocatMarker=map.addMarker(markerOpt);
}
}
}
调用buildGoogleAppClient()后,需要调用mgoogleAppClient.connect()。这会使onConnected()被调用。ref您的答案对我来说很有用,但为什么他们不在教程中使用它;)。但是当我点击后退按钮时,我在一个空对象引用上得到了'com.google.android.model.Marker.com.google.android.gms.maps.GoogleMap.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)
Map.onConnected(Map.java:494)
您介意分享一些代码吗?**等等,我是多任务的-这从来不是一件好事。让我想一想,我打赌这与活动生命周期有关。我在想,当你转到你的位置时,会调用新的activity onPause(),当你点击后退按钮时,应该调用onResume()。尝试重新初始化myLocatMarker,我不确定这是否会解决它,因为我没有坐在您的计算机前,但我会查看您的发现。