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OnCompleteListener block ignored (android studio, java)

I am trying to get data from firebase (once) so I am using the OnCompleteListener but it seems it is not being triggered

private void checkAvailability() {
        db = FirebaseFirestore.getInstance();
        String datePath = "Date " + reservationObject.getDate();
        String timePath = "Time " + reservationObject.getTime();
        docRef = db.collection(datePath).document(timePath);
        docRef.get().addOnCompleteListener(task -> {
                if (task.isSuccessful()) {
                DocumentSnapshot document = task.getResult();
                if (document.exists()) {
                    //function logic//

                } else {
                    task.getException();
                }
            }
        });
    } // skipping immediately to this line

this is the gardle dependency file:

 implementation(platform("com.google.firebase:firebase-bom:32.7.0"))
    implementation("androidx.appcompat:appcompat:1.6.1")
    implementation("com.google.android.material:material:1.10.0")
    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
    implementation("androidx.navigation:navigation-fragment:2.7.6")
    implementation("androidx.navigation:navigation-ui:2.7.6")
    implementation("com.google.firebase:firebase-database:20.3.0")
    implementation("com.google.firebase:firebase-firestore:24.10.0")
    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
    implementation ("com.google.firebase:firebase-messaging:15.0.2")```

and this is the firebase collection:
enter image description here

Tried getting the task.getException(); but the block is completely ignored

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I changed database to realtime (instead of firestore) and used this answer: Wait Firebase async retrieve data in Android


  2. 0

    addOnCompleteListener receives a callback as part of it’s asynchronous behavior, it will trigger the callback once the operation has been completed.

    I noticed your function is synchronous, which means it simply continues to execute and the flow might end before your async operation has been completed.

    As I see it, you could either –

    • Refactor your code flow to use Future of some sort
    • Perform the call syncronously
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