我正在处理地点。我使用geoFire.getLocation(riderID, new LocationCallback()从firebase获取位置。我在onCreate方法上创建了rLocations = new ArrayList<>();。然后我在`public void passingRiderID（String riderID）中添加值。
在public void findingNearestRider()我希望找到最近的炊具，但我发现列表是空的。
DatabaseReference riderPRIMARYKEY = FirebaseDatabase.getInstance().getReference("Rider Primary Key");
DatabaseReference riderLocation = FirebaseDatabase.getInstance().getReference("Rider Location Information");
FirebaseUser cookerRefrence = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference cookerLocationRefrence = FirebaseDatabase.getInstance().getReference("Expert Location Information");
GeoFire geoFireCooker= new GeoFire(cookerLocationRefrence);
GeoFire geoFire = new GeoFire(riderLocation);
public static List<Location> rLocations;
Location cookerLOCATION;
public static Location colsestRiderLocation;
public static float smallestDistance = -1;
TextView riderID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_riders_ids2);
riderID =(TextView)findViewById(R.id.tvRiderID);
rLocations = new ArrayList<>();
try{
findingRiderID();
}catch (Exception e){
e.printStackTrace();
}finally {
findingCookerLocation();
}
}
public void findingRiderID(){
riderPRIMARYKEY.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot riderSnapshot: dataSnapshot.getChildren()){
try{
Log.d("User key", riderSnapshot.getKey());
passingRiderID(riderSnapshot.getKey());
}catch (Exception e){
e.printStackTrace();
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void passingRiderID(String riderID){
geoFire.getLocation(riderID, new LocationCallback() {
@Override
public void onLocationResult(String key, GeoLocation riderID) {
Location riderLOCATION = new Location("");
riderLOCATION.setLatitude(riderID.latitude);
riderLOCATION.setLongitude(riderID.longitude);
Log.d("Rider location", riderLOCATION.toString());
rLocations.add(riderLOCATION); //here adding values into list
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void findingCookerLocation(){
geoFireCooker.getLocation(cookerRefrence.getUid(), new LocationCallback() {
@Override
public void onLocationResult(String key, GeoLocation cookerID) {
cookerLOCATION = new Location("");
cookerLOCATION.setLatitude(cookerID.latitude);
cookerLOCATION.setLongitude(cookerID.longitude);
Log.d("cooker location",cookerLOCATION.toString());
findingNearestRider();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void findingNearestRider(){
if(rLocations.isEmpty()){
Log.d("Closet Rider empty",rLocations.toString());
}else{
try {
for(Location rlocation : rLocations){
float distance= cookerLOCATION.distanceTo(rlocation);
//int distance = Location.distanceBetween(cookLAT,cookLONG,rlocation.getLatitude(),rlocation.getLongitude(),results);
if(smallestDistance == -1 || distance < smallestDistance){
colsestRiderLocation = rlocation;
smallestDistance = distance;
Log.d("Closet Rider Location",colsestRiderLocation.toString());
}
}
}catch (Exception e){
e.printStackTrace();
}
}
}
我按你说的方式更改了代码。
DatabaseReference riderPRIMARYKEY = FirebaseDatabase.getInstance().getReference("Rider Primary Key");
DatabaseReference riderLocation = FirebaseDatabase.getInstance().getReference("Rider Location Information");
FirebaseUser cookerRefrence = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference cookerLocationRefrence = FirebaseDatabase.getInstance().getReference("Expert Location Information");
GeoFire geoFireCooker= new GeoFire(cookerLocationRefrence);
GeoFire geoFire = new GeoFire(riderLocation);
public List<Location> rLocations;
Location cookerLOCATION;
Location riderLOCATION;
public static Location colsestRiderLocation;
public static float smallestDistance = -1;
TextView riderID;
Boolean checkCook=false,checkRider=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_riders_ids2);
riderID =(TextView)findViewById(R.id.tvRiderID);
rLocations = new ArrayList<>();
try{
findingRiderID(new passignriderID() {
@Override
public void onCallback(String riderID) {
Log.d("Rider Id", riderID);
passingRiderID(riderID, new storingriderID() {
@Override
public void onCallback(Location riderLoc) {
Log.d("Rider location", riderLoc.toString());
rLocations.add(riderLoc); //now here adding values
checkRider=true;
}
});
}
});
findingCookerLocation(new cookerID() {
@Override
public void onCallback(Location cookerLoc) {
cookerLOCATION = cookerLoc;
checkCook=true;
Log.d("cooker location",cookerLOCATION.toString());
}
});
}catch (Exception e){
e.printStackTrace();
}finally{
if(checkRider==true || checkCook== true){
Log.d("inside check con",cookerLOCATION.toString());
}
findingNearestRider(cookerLOCATION,rLocations);
}
}
public void findingRiderID(final passignriderID myCallback){
riderPRIMARYKEY.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot riderSnapshot: dataSnapshot.getChildren()){
try{
//Log.d("User key", riderSnapshot.getKey());
String key = riderSnapshot.getKey();
myCallback.onCallback(key);
}catch (Exception e){
e.printStackTrace();
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void passingRiderID(String riderID, final storingriderID myCallback){
geoFire.getLocation(riderID, new LocationCallback() {
@Override
public void onLocationResult(String key, GeoLocation riderID) {
riderLOCATION = new Location("");
riderLOCATION.setLatitude(riderID.latitude);
riderLOCATION.setLongitude(riderID.longitude);
//Log.d("Rider location", riderLOCATION.toString());
myCallback.onCallback(riderLOCATION);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void findingCookerLocation(final cookerID myCallback){
geoFireCooker.getLocation(cookerRefrence.getUid(), new LocationCallback() {
@Override
public void onLocationResult(String key, GeoLocation cookerID) {
cookerLOCATION = new Location("");
cookerLOCATION.setLatitude(cookerID.latitude);
cookerLOCATION.setLongitude(cookerID.longitude);
myCallback.onCallback(cookerLOCATION);
//Log.d("cooker location",cookerLOCATION.toString());
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void findingNearestRider(Location cookerLoc, List<Location> rLoc){
/*if(rLoc.isEmpty()){
Log.d("Closet Rider empty",rLoc.toString());
}else{
for(Location loc : rLoc){
Log.d("Closet Rider not empty", String.valueOf(loc));
Log.d("cooker loc in find", String.valueOf(cookerLoc));
}
}*/
if(rLoc.isEmpty()){
Log.d("Closet Rider empty",rLoc.toString());
}else{
try {
for(Location rlocation : rLoc){
float distance= cookerLoc.distanceTo(rlocation);
//int distance = Location.distanceBetween(cookLAT,cookLONG,rlocation.getLatitude(),rlocation.getLongitude(),results);
if(smallestDistance == -1 || distance < smallestDistance){
colsestRiderLocation = rlocation;
smallestDistance = distance;
Log.d("Closet Rider Location",colsestRiderLocation.toString());
}
}
}catch (Exception e){
e.printStackTrace();
}
}
}
public interface passignriderID{
void onCallback(String riderID);
}
public interface storingriderID{
void onCallback(Location riderLoc);
}
public interface cookerID{
void onCallback(Location cookerLoc);
}
这是解决方案。
DatabaseReference riderPRIMARYKEY = FirebaseDatabase.getInstance().getReference("Rider Primary Key");
DatabaseReference riderLocation = FirebaseDatabase.getInstance().getReference("Rider Location Information");
FirebaseUser cookerRefrence = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference cookerLocationRefrence = FirebaseDatabase.getInstance().getReference("Expert Location Information");
GeoFire geoFireCooker= new GeoFire(cookerLocationRefrence);
GeoFire geoFire = new GeoFire(riderLocation);
public static List<Location> rLocations;
Location cookerLOCATION;
Location riderLOCATION;
public static Location colsestRiderLocation;
public static float smallestDistance = -1;
TextView riderID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_riders_ids2);
riderID =(TextView)findViewById(R.id.tvRiderID);
rLocations = new ArrayList<>();
try{
findingRiderID(new passignriderID() {
@Override
public void onCallback(String riderID) {
passingRiderID(riderID, new listData() {
@Override
public void onCallBack(List<Location> list) {
Log.d("List data",list.toString());
findingNearestRider();
}
});
}
});
findingCookerLocation();
}catch (Exception e){
e.printStackTrace();
}
}
public void findingRiderID(final passignriderID myCallBack){
riderPRIMARYKEY.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot riderSnapshot: dataSnapshot.getChildren()){
try{
Log.d("User key", riderSnapshot.getKey());
String riderID= riderSnapshot.getKey();
myCallBack.onCallback(riderID);
}catch (Exception e){
e.printStackTrace();
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void passingRiderID(String riderID, final listData myCallBack){
geoFire.getLocation(riderID, new LocationCallback() {
@Override
public void onLocationResult(String key, GeoLocation riderID) {
riderLOCATION = new Location("");
riderLOCATION.setLatitude(riderID.latitude);
riderLOCATION.setLongitude(riderID.longitude);
rLocations.add(riderLOCATION);
Log.d("Rider location", riderLOCATION.toString());
myCallBack.onCallBack(rLocations);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void findingCookerLocation(){
geoFireCooker.getLocation(cookerRefrence.getUid(), new LocationCallback() {
@Override
public void onLocationResult(String key, GeoLocation cookerID) {
cookerLOCATION = new Location("");
cookerLOCATION.setLatitude(cookerID.latitude);
cookerLOCATION.setLongitude(cookerID.longitude);
Log.d("cooker location",cookerLOCATION.toString());
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void findingNearestRider(){
/*if(rLocations.isEmpty()){
Log.d("Closet Rider empty",rLocations.toString());
}else{
for(Location loc : rLocations){
Log.d("Closet Rider not empty", String.valueOf(loc));
}
}*/
if(rLocations.isEmpty()){
Log.d("Closet Rider empty",rLocations.toString());
}else{
try {
for(Location rlocation : rLocations){
float distance= cookerLOCATION.distanceTo(rlocation);
//int distance = Location.distanceBetween(cookLAT,cookLONG,rlocation.getLatitude(),rlocation.getLongitude(),results);
if(smallestDistance == -1 || distance < smallestDistance){
colsestRiderLocation = rlocation;
smallestDistance = distance;
Log.d("Closet Rider Location",colsestRiderLocation.toString());
}
}
}catch (Exception e){
e.printStackTrace();
}
}
}
public interface passignriderID{
void onCallback(String riderID);
}
private interface listData{
void onCallBack(List<Location> list);
}