This is my function that calls the two other functions that crash my app. I know it crashes because the retrieval function in database is asynchronous. I faced this in developing the iOS App, is there a way to make this work properly?
private void FetchMatchInformation(String key) {
final DatabaseReference userDb = FirebaseDatabase.getInstance().getReference().child("Users").child(key);
userDb.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists() && dataSnapshot.getKey() != currentUserId && !blockingMe(dataSnapshot.getKey()) && !hidingHim(dataSnapshot.getKey()) ){
//Some code
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
First Function
private boolean blockingMe(String key) {
final DatabaseReference MeB = FirebaseDatabase.getInstance().getReference().child(currentUserId).child("blockingUser").child(key);
final Boolean[] x = new Boolean[1];
MeB.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists()){
x[0] = true;
}else{
x[0] = false;
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
return x[0];
}
Second Function
private boolean hidingHim(String key) {
final DatabaseReference MeB = FirebaseDatabase.getInstance().getReference().child(key).child("hidingUser").child(currentUserId);
final Boolean[] x = new Boolean[1];
MeB.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists()){
x[0] = true;
}else{
x[0] = false;
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
return x[0];
}
