Im trying to write on firebase realtime database via my android app using setValue()
it works very well.. but i don't know how i can handle the error if something goes wrong
i tried try/catch and turning off the WIFI so the setValue
function won't work but it didn't seem to catch any exception
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("message");
try{
myRef.setValue("Hello, World!");
}catch(Exception e){
e.printStackTrace();
}
There are many methods you can use to handle this. You can set any of several listeners to monitor the result state of a setValue()
call:
onCompleteListener()
onFailureListener()
onSuccessListener()
My personal preference is the onCompleteListener()
because it allows me to simultaneously check for success and failure with minimal lines of code. Here's an implementation:
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("message");
myRef.setValue("Hello, World!").addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if(task.isSuccessful()) {
// handle success event
}
else {
// handle failure event
// You can get the exact exception using task.getException()
}
}
});
I hope this helps. Merry coding!
You can use Completion Callback .
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("message");
myRef.setValue("Hello, World!")
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
// Write was successful!
// ...
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
// Write failed
// ...
}
});
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.