java - 在firebase数据获取方法中创建无限循环

Question

private void fetchdata() {
    db.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {
            ArrayList<String> cities = (ArrayList) documentSnapshot.get("cities");
            i = new Intent(Splash.this, Select.class);
            i.putStringArrayListExtra("cities", cities);
            startActivity(i);
        }

    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {

           /*do when the cities list is not fetch  */
            fetchdata();
        }
    });
}

如果在失败侦听器中再次调用发生数据获取错误的方法并且启动继续，它会在启动屏幕中工作，这是......正确的方式

标签： javaandroidfirebasegoogle-cloud-firestore

Answer 1

private void fetchdata() {
    ArrayList<String> cities = new ArrayList<String>();
    i = new Intent(Splash.this, Select.class);

    db.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {

            cities = (ArrayList) documentSnapshot.get("cities");
            i.putStringArrayListExtra("cities", cities);
            startActivity(i);
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {

            /* simple startActivity  */
            i.putStringArrayListExtra("cities", cities);
            startActivity(i);
        }
    });
}