当使用addGeoQueryDataEventListener时，我将所有用户存储在一个arraylist中（应该为3个），除了我要获取arraylist size（）时，其打印的是1,2,3，而不是3。
private int radius = 40;
private Boolean userFound = false;
private String userLocationID;
private ArrayList<String> mUserIDLocation;
final UserLocation userLocation = new UserLocation();
public void getUserLocation() {
final DatabaseReference mRef = FirebaseDatabase.getInstance().getReference();
final GeoFire geoFire = new GeoFire(mRef.child("user_location"));
mUserIDLocation = new ArrayList<String>();
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
return;
}
fusedLocationClient.getLastLocation().addOnSuccessListener((Activity) MainActivity.this, new OnSuccessListener<Location>() {
@Override
public void onSuccess(Location location) {
if (location != null) {
//Toast.makeText(this, "UserLocation " + location.toString(), Toast.LENGTH_SHORT ).show();
//final Location userLocation = location;
Log.d(TAG, "onSuccess: UserLocation" + location);
Log.d(TAG, "onSuccess: UserLocation Latitude " + location.getLatitude());
String user_id = FirebaseAuth.getInstance().getCurrentUser().getUid();
geoFire.setLocation(user_id, new GeoLocation(location.getLatitude(), location.getLongitude()), new GeoFire.CompletionListener() {
@Override
public void onComplete(String key, DatabaseError error) {
}
});
}
}
});
GeoQuery geoQuery = geoFire.queryAtLocation(new GeoLocation(48.435, -122.084), radius);
geoQuery.addGeoQueryDataEventListener(new GeoQueryDataEventListener() {
@Override
public void onDataEntered(DataSnapshot dataSnapshot, GeoLocation location) {
Log.d(TAG, "onDataEntered: datasnapshot " + dataSnapshot);
mFollowing.add(dataSnapshot.getKey());
Log.d(TAG, "onDataEntered: mFollowing " + mFollowing);
Log.d(TAG, "onDataEntered: mFollowing Size " + mFollowing.size());
getPost();
}
@Override
public void onDataExited(DataSnapshot dataSnapshot) {
}
@Override
public void onDataMoved(DataSnapshot dataSnapshot, GeoLocation location) {
}
@Override
public void onDataChanged(DataSnapshot dataSnapshot, GeoLocation location) {
}
@Override
public void onGeoQueryReady() {
}
@Override
public void onGeoQueryError(DatabaseError error) {
}
});
}
一个用户数据快照的日志：
DataSnapshot { key = xjfXxJ3spuPNywtHyqg5rNnlIMD3, value = {.priority=c295tcm4kd, l={0=48.435, 1=-122.084}, g=c295tcm4kd} }
mFollowing数组的日志：
2019-04-03 18:13:30.821 28961-28961/? D/MainActivity: onDataEntered: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3]
2019-04-03 18:13:31.651 28961-28961/com.beepic D/MainActivity: onDataEntered: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2]
2019-04-03 18:13:31.653 28961-28961/com.beepic D/MainActivity: onDataEntered: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2, IWJbi7sQe2MdbWET9d1vEqum9tb2]
mFollowing.size（）的日志
2019-04-03 18:13:30.821 28961-28961/? D/MainActivity: onDataEntered: mFollowing Size 1
2019-04-03 18:13:31.651 28961-28961/com.beepic D/MainActivity: onDataEntered: mFollowing Size 2
2019-04-03 18:13:31.653 28961-28961/com.beepic D/MainActivity: onDataEntered: mFollowing Size 3
下面是我使用mFollowing.size（）从存储在mFollowing中的用户获取所有帖子的地方。
private void getPost(){
Log.d(TAG, "getPost: getting post");
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Log.d(TAG, "getPost: mfollowing size3 " + mFollowing.size());
for( int i = 0; i < mFollowing.size(); i++){
Log.d(TAG, "getPost: mFollowing " + mFollowing);
Log.d(TAG, "getPost: getting size " + mFollowing.size());
final int count = i;
Query query = reference
.child(getString(R.string.dbname_user_interest_post))
.child(mFollowing.get(i))
.orderByChild(getString(R.string.field_user_id))
.equalTo(mFollowing.get(i));
Log.d(TAG, "getPost: getPost query: " + query);
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for(DataSnapshot singleSnapshot : dataSnapshot.getChildren()){
Log.d(TAG, "onDataChange: main feed getChildren " + dataSnapshot.getChildren());
Log.d(TAG, "onDataChange: onDataChange main feed: " + singleSnapshot
.child(getString(R.string.field_user_id)));
NewPost post = new NewPost();
Map<String, Object> objectMap = (HashMap<String, Object>) singleSnapshot.getValue();
post.setCaption(objectMap.get(getString(R.string.field_caption)).toString());
post.setPhoto_id(objectMap.get(getString(R.string.field_photo_id)).toString());
post.setUser_id(objectMap.get(getString(R.string.field_user_id)).toString());
post.setInterest(objectMap.get(getString(R.string.string_interest)).toString());
post.setDate_created(objectMap.get(getString(R.string.field_date_created)).toString());
post.setImage_path(objectMap.get(getString(R.string.field_image_path)).toString());
Log.d(TAG, "onDataChange: getPost caption main " + post);
mNewPost.add(post);
}
if(count >= mFollowing.size() -1){
//display post
displayPost();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
这是在getPost（）中使用时的日志mFollowing；
2019-04-03 18:19:32.476 29167-29167/? D/MainActivity: getPost: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3]
2019-04-03 18:19:33.019 29167-29167/com.beepic D/MainActivity: getPost: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2]
2019-04-03 18:19:33.020 29167-29167/com.beepic D/MainActivity: getPost: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2]
2019-04-03 18:19:33.020 29167-29167/com.beepic D/MainActivity: getPost: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2, IWJbi7sQe2MdbWET9d1vEqum9tb2]
2019-04-03 18:19:33.021 29167-29167/com.beepic D/MainActivity: getPost: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2, IWJbi7sQe2MdbWET9d1vEqum9tb2]
2019-04-03 18:19:33.021 29167-29167/com.beepic D/MainActivity: getPost: mFollowing [xjfXxJ3spuPNywtHyqg5rNnlIMD3, TMOb5NL8igZovGkiZdVcl3UQmxV2, IWJbi7sQe2MdbWET9d1vEqum9tb2]
正如您所看到的，这导致我的帖子数全部消失。在实现GeoFire之前，我没有使用下面的代码，但它可以正常工作，但它可以使每个用户都进入数据库。 m以下大小为7（数据库中的当前用户数）。
private void getUsersPost() {
Log.d(TAG, "getUsersPost: getting all the post");
swipe.setRefreshing(false);
Log.d(TAG, "onKeyEntered: setUserLocation insidegetUserPost " + userLocation.getUserLocations());
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference
.child("user_location");
//getString(R.string.dbname_user_interest_post)
Log.d(TAG, "getUsersPost: getUserPost query main: " + query);
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
Log.d(TAG, "onDataChange: found user main getUsersPost: " + singleSnapshot.getKey());
mFollowing.add(singleSnapshot.getKey());
Log.d(TAG, "onDataEntered: mFollowing1 " + mFollowing);
Log.d(TAG, "onDataEntered: mFollowing size1 " + mFollowing.size());
}
Log.d(TAG, "onDataEntered: mFollowing2 " + mFollowing);
Log.d(TAG, "onDataEntered: mFollowing size2 " + mFollowing.size());
//get the post
getPost();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
如果有人有任何疑问，请询问。我很想解决这个问题。