Geofire - 未找到位置
Geofire - not found locations
如何使用 Geo Queries 获取接近已通过的 GeoLocation(double lat, double lng)
的所有位置。
我有以下代码(它什么也没发生):
public void setCurrentLatLng(double lat, double lng){
this.lat = lat;
this.lng = lng;
GeoLocation geoLocation = new GeoLocation(lat, lng);
updateCurrenLocation(geoLocation);
GeoQuery geoQuery = geoFire.queryAtLocation(geoLocation, 8f);
geoQuery.addGeoQueryDataEventListener(new GeoQueryDataEventListener() {
@Override
public void onDataEntered(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d("geoQuery","onDataEntered "+dataSnapshot.toString());
// ...
}
@Override
public void onDataExited(DataSnapshot dataSnapshot) {
Log.d("geoQuery","onDataExited "+dataSnapshot.toString());
// ...
}
@Override
public void onDataMoved(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d("geoQuery","onDataMoved "+dataSnapshot.toString());
// ...
}
@Override
public void onDataChanged(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d("geoQuery","onDataChanged "+dataSnapshot.toString());
// ...
}
@Override
public void onGeoQueryReady() {
// ...
Log.d("geoQuery","onGeoQueryReady");
}
@Override
public void onGeoQueryError(DatabaseError error) {
Log.d("geoQuery","onGeoQueryError");
// ...
}
});
this.setChanged();
notifyObservers();
this.clearChanged();
Log.d("update","clearChanged");
}
这是我的 Firebase 数据:
我想我愿意根据需要修改数据结构。
日志
09-12 08:55:33.818 17710-17710/es.rchampa.weirdo D/geoQuery: lat=40.4430883 lng=-3.721805
09-12 08:55:33.982 17710-17710/es.rchampa.weirdo D/geoQuery: lat=40.4430883 lng=-3.721805
09-12 08:55:33.986 17710-17710/es.rchampa.weirdo D/geoQuery: onGeoQueryReady
09-12 08:55:34.025 17710-17710/es.rchampa.weirdo D/geoQuery: onGeoQueryReady
Gradle 文件
....
// Firebase
implementation 'com.google.firebase:firebase-database:16.0.1'
implementation 'com.google.firebase:firebase-storage:16.0.1'
implementation 'com.google.firebase:firebase-auth:16.0.3'
implementation 'com.google.firebase:firebase-crash:16.2.0'
implementation 'com.google.firebase:firebase-core:16.0.3'
// Firebase UI
implementation 'com.firebaseui:firebase-ui-database:1.2.0'
//Firebase GeoFire
implementation 'com.firebase:geofire-android:2.3.1'
// Google Play Services
implementation 'com.google.android.gms:play-services-auth:16.0.0'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-location:15.0.1'
....
更新
如果您愿意,我可以授予对我的私人存储库的访问权限。
你将值 8f
(浮点数)作为那里的 radius
传递,而 radius
应该是 8.0d
或 Double.valueOf(8.0)
,其中 MAX_SUPPORTED_RADIUS
等于8587
公里。
虽然实际问题是 GeoFire
已经需要知道 .child("location")
,但不可能用 Reference
来表示;只有 DataSnapshot
有 getChildren()
.
底线是:
you'd have to create a separate locations Reference
, in order to avoid the nesting. nevertheless you still can use the related uid
key for these nodes (or at least add it as a child-node), in order to be able to look up within the users Reference
. it's a 1:1
relation, in between two Reference
s.
所以这是一个有效的 Java
示例,只是因为...
我们假设以下结构(如上所述):
{
"locations" : {
"CR88aa9gnDfJYYGq5ZTMwwC38C12" : {
".priority" : "9q8yywdgue",
"g" : "9q8yywdgue",
"l" : [ 37.7853889, -122.4056973 ]
}
},
"users" : {
"CR88aa9gnDfJYYGq5ZTMwwC38C12" : {
"displayName" : "user 01",
...
}
}
}
数据库规则应为 locations
字段 g
设置 .indexOn
:
{
"rules": {
...
"locations": {
".indexOn": "g"
}
}
}
模块中的依赖关系 build.gradle
:
dependencies {
...
implementation "com.firebase:geofire-android:2.3.1"
}
这演示了如何通过 GeoQuery
结果获取用户的快照;
注意 GeoQueryEventListener
而不是 GeoQueryDataEventListener
:
public class GeofireActivity extends AppCompatActivity {
private static final String LOG_TAG = GeofireActivity.class.getSimpleName();
private DatabaseReference refBase = null;
private DatabaseReference refLocation = null;
private DatabaseReference refUser = null;
private GeoFire geoFire = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.fragment_geofire);
this.setReferences();
}
private void setReferences() {
this.refBase = FirebaseDatabase.getInstance().getReference();
this.refUser = refBase.child("users");
this.refLocation = refBase.child("locations");
this.geoFire = new GeoFire(this.refLocation);
}
private void searchNearby(double latitude, double longitude, double radius) {
this.searchNearby(new GeoLocation(latitude, longitude), radius);
}
private void searchNearby(GeoLocation location, double radius) {
GeoQuery geoQuery = this.geoFire.queryAtLocation(location, radius);
geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
@Override
public void onKeyEntered(String key, GeoLocation location) {
String loc = String.valueOf(location.latitude) + ", " + String.valueOf(location.longitude);
Log.d(LOG_TAG, "onKeyEntered: " + key + " @ " + loc);
/* once the key is known, one can lookup the associated record */
refUser.child(key).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
Log.d(LOG_TAG, "onDataChange: " + dataSnapshot.toString());
}
@Override
public void onCancelled(@NonNull DatabaseError firebaseError) {
Log.e(LOG_TAG, "onCancelled: " + firebaseError.getMessage());
}
});
}
@Override
public void onKeyExited(String key) {
Log.d(LOG_TAG, "onKeyExited: " + key);
}
@Override
public void onKeyMoved(String key, GeoLocation location) {
Log.d(LOG_TAG, "onKeyMoved: " + key);
}
@Override
public void onGeoQueryReady() {
Log.d(LOG_TAG, "onGeoQueryReady");
}
@Override
public void onGeoQueryError(DatabaseError error) {
Log.e(LOG_TAG, "onGeoQueryError" + error.getMessage());
}
});
}
}
为了保持完整性,需要在删除用户记录时删除关联的位置记录 - 否则会导致无法再查找密钥。
就目前而言,geofire
有点像索引以进行地理查询,并提供所需文档的键(将存储在单独的 "collection" 中)。
您应该使用 geofire
和一个单独的 "collection"(称之为 usersLocations)
DatabaseReference ref = FirebaseDatabase.getInstance().getReference("usersLocations");
GeoFire geoFire = new GeoFire(ref);
现在您可以将它用作您的 用户 的索引,并且可以像这样向它添加项目。
geoFire.setLocation('QymlMpC0Zc', new GeoLocation(40.2334983, -3.7185183));
您的 Firebase RTDB 现在将如下所示:
{
'users': {
'QymlMpC0Zc': {
// All your data here
}
},
'usersLocations': {
'QymlMpC0Zc': {
'g': 'ezjkgkk305',
'l': {
'0': 40.2334983,
'1': -3.7185183
}
}
}
}
所以最后,当你对你的 geoFire
进行查询时,你最终会解雇你拥有的任何听众。
小提示...我不是 Java 开发人员,但我是 use/know geofire
一般。希望我的 advice/thoughts 会有所帮助。
问题是当你通过半径时
根据问题 https://github.com/firebase/geofire-java/issues/72
double radius = 8589; // Fails
// double radius = 8587.8; //Passes
尝试像这样传递值,这可能会有所帮助
//GeoQuery geoQuery = geoFire.queryAtLocation(geoLocation, 8f);
GeoQuery geoQuery = geoFire.queryAtLocation(geoLocation, radius);
passing value 8f (float) as the radius, while the the radius
should rather be 8.0d or Double.valueOf(8.0), where
MAX_SUPPORTED_RADIUS equals 8587 kilometers.
如何使用 Geo Queries 获取接近已通过的 GeoLocation(double lat, double lng)
的所有位置。
我有以下代码(它什么也没发生):
public void setCurrentLatLng(double lat, double lng){
this.lat = lat;
this.lng = lng;
GeoLocation geoLocation = new GeoLocation(lat, lng);
updateCurrenLocation(geoLocation);
GeoQuery geoQuery = geoFire.queryAtLocation(geoLocation, 8f);
geoQuery.addGeoQueryDataEventListener(new GeoQueryDataEventListener() {
@Override
public void onDataEntered(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d("geoQuery","onDataEntered "+dataSnapshot.toString());
// ...
}
@Override
public void onDataExited(DataSnapshot dataSnapshot) {
Log.d("geoQuery","onDataExited "+dataSnapshot.toString());
// ...
}
@Override
public void onDataMoved(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d("geoQuery","onDataMoved "+dataSnapshot.toString());
// ...
}
@Override
public void onDataChanged(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d("geoQuery","onDataChanged "+dataSnapshot.toString());
// ...
}
@Override
public void onGeoQueryReady() {
// ...
Log.d("geoQuery","onGeoQueryReady");
}
@Override
public void onGeoQueryError(DatabaseError error) {
Log.d("geoQuery","onGeoQueryError");
// ...
}
});
this.setChanged();
notifyObservers();
this.clearChanged();
Log.d("update","clearChanged");
}
这是我的 Firebase 数据:
我想我愿意根据需要修改数据结构。
日志
09-12 08:55:33.818 17710-17710/es.rchampa.weirdo D/geoQuery: lat=40.4430883 lng=-3.721805
09-12 08:55:33.982 17710-17710/es.rchampa.weirdo D/geoQuery: lat=40.4430883 lng=-3.721805
09-12 08:55:33.986 17710-17710/es.rchampa.weirdo D/geoQuery: onGeoQueryReady
09-12 08:55:34.025 17710-17710/es.rchampa.weirdo D/geoQuery: onGeoQueryReady
Gradle 文件
....
// Firebase
implementation 'com.google.firebase:firebase-database:16.0.1'
implementation 'com.google.firebase:firebase-storage:16.0.1'
implementation 'com.google.firebase:firebase-auth:16.0.3'
implementation 'com.google.firebase:firebase-crash:16.2.0'
implementation 'com.google.firebase:firebase-core:16.0.3'
// Firebase UI
implementation 'com.firebaseui:firebase-ui-database:1.2.0'
//Firebase GeoFire
implementation 'com.firebase:geofire-android:2.3.1'
// Google Play Services
implementation 'com.google.android.gms:play-services-auth:16.0.0'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-location:15.0.1'
....
更新
如果您愿意,我可以授予对我的私人存储库的访问权限。
你将值 8f
(浮点数)作为那里的 radius
传递,而 radius
应该是 8.0d
或 Double.valueOf(8.0)
,其中 MAX_SUPPORTED_RADIUS
等于8587
公里。
虽然实际问题是 GeoFire
已经需要知道 .child("location")
,但不可能用 Reference
来表示;只有 DataSnapshot
有 getChildren()
.
底线是:
you'd have to create a separate locations
Reference
, in order to avoid the nesting. nevertheless you still can use the relateduid
key for these nodes (or at least add it as a child-node), in order to be able to look up within the usersReference
. it's a1:1
relation, in between twoReference
s.
所以这是一个有效的 Java
示例,只是因为...
我们假设以下结构(如上所述):
{
"locations" : {
"CR88aa9gnDfJYYGq5ZTMwwC38C12" : {
".priority" : "9q8yywdgue",
"g" : "9q8yywdgue",
"l" : [ 37.7853889, -122.4056973 ]
}
},
"users" : {
"CR88aa9gnDfJYYGq5ZTMwwC38C12" : {
"displayName" : "user 01",
...
}
}
}
数据库规则应为 locations
字段 g
设置 .indexOn
:
{
"rules": {
...
"locations": {
".indexOn": "g"
}
}
}
模块中的依赖关系 build.gradle
:
dependencies {
...
implementation "com.firebase:geofire-android:2.3.1"
}
这演示了如何通过 GeoQuery
结果获取用户的快照;
注意 GeoQueryEventListener
而不是 GeoQueryDataEventListener
:
public class GeofireActivity extends AppCompatActivity {
private static final String LOG_TAG = GeofireActivity.class.getSimpleName();
private DatabaseReference refBase = null;
private DatabaseReference refLocation = null;
private DatabaseReference refUser = null;
private GeoFire geoFire = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.fragment_geofire);
this.setReferences();
}
private void setReferences() {
this.refBase = FirebaseDatabase.getInstance().getReference();
this.refUser = refBase.child("users");
this.refLocation = refBase.child("locations");
this.geoFire = new GeoFire(this.refLocation);
}
private void searchNearby(double latitude, double longitude, double radius) {
this.searchNearby(new GeoLocation(latitude, longitude), radius);
}
private void searchNearby(GeoLocation location, double radius) {
GeoQuery geoQuery = this.geoFire.queryAtLocation(location, radius);
geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
@Override
public void onKeyEntered(String key, GeoLocation location) {
String loc = String.valueOf(location.latitude) + ", " + String.valueOf(location.longitude);
Log.d(LOG_TAG, "onKeyEntered: " + key + " @ " + loc);
/* once the key is known, one can lookup the associated record */
refUser.child(key).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
Log.d(LOG_TAG, "onDataChange: " + dataSnapshot.toString());
}
@Override
public void onCancelled(@NonNull DatabaseError firebaseError) {
Log.e(LOG_TAG, "onCancelled: " + firebaseError.getMessage());
}
});
}
@Override
public void onKeyExited(String key) {
Log.d(LOG_TAG, "onKeyExited: " + key);
}
@Override
public void onKeyMoved(String key, GeoLocation location) {
Log.d(LOG_TAG, "onKeyMoved: " + key);
}
@Override
public void onGeoQueryReady() {
Log.d(LOG_TAG, "onGeoQueryReady");
}
@Override
public void onGeoQueryError(DatabaseError error) {
Log.e(LOG_TAG, "onGeoQueryError" + error.getMessage());
}
});
}
}
为了保持完整性,需要在删除用户记录时删除关联的位置记录 - 否则会导致无法再查找密钥。
就目前而言,geofire
有点像索引以进行地理查询,并提供所需文档的键(将存储在单独的 "collection" 中)。
您应该使用 geofire
和一个单独的 "collection"(称之为 usersLocations)
DatabaseReference ref = FirebaseDatabase.getInstance().getReference("usersLocations");
GeoFire geoFire = new GeoFire(ref);
现在您可以将它用作您的 用户 的索引,并且可以像这样向它添加项目。
geoFire.setLocation('QymlMpC0Zc', new GeoLocation(40.2334983, -3.7185183));
您的 Firebase RTDB 现在将如下所示:
{
'users': {
'QymlMpC0Zc': {
// All your data here
}
},
'usersLocations': {
'QymlMpC0Zc': {
'g': 'ezjkgkk305',
'l': {
'0': 40.2334983,
'1': -3.7185183
}
}
}
}
所以最后,当你对你的 geoFire
进行查询时,你最终会解雇你拥有的任何听众。
小提示...我不是 Java 开发人员,但我是 use/know geofire
一般。希望我的 advice/thoughts 会有所帮助。
问题是当你通过半径时 根据问题 https://github.com/firebase/geofire-java/issues/72
double radius = 8589; // Fails
// double radius = 8587.8; //Passes
尝试像这样传递值,这可能会有所帮助
//GeoQuery geoQuery = geoFire.queryAtLocation(geoLocation, 8f);
GeoQuery geoQuery = geoFire.queryAtLocation(geoLocation, radius);
passing value 8f (float) as the radius, while the the radius should rather be 8.0d or Double.valueOf(8.0), where MAX_SUPPORTED_RADIUS equals 8587 kilometers.