Firestore报错：Builder中无法解析setTimestampsInSnapshotsEnabled方法

问题原因 #

setTimestampsInSnapshotsEnabled这个方法在Firebase Firestore 17.0.0及以上版本已经被移除——该时间戳快照功能现在是默认启用的，无需手动配置，所以调用这个方法会报“找不到方法”的错误。

另外你的代码里还有个类型错误：把collection().document()返回的DocumentReference对象，错误声明成了FirebaseFirestoreSettings类型，这会导致后续调用set(user)时也出现异常。

修复步骤 #

1. 移除过时配置代码：直接删掉以下这段无用的配置代码：

FirebaseFirestoreSettings settings = new FirebaseFirestoreSettings.Builder()
        .setTimestampsInSnapshotsEnabled(true)
        .build();
mDb.setFirestoreSettings(settings);

2. 修正变量类型：把错误的变量声明改成正确的DocumentReference类型：

// 错误写法
FirebaseFirestoreSettings newUserRef = mDb
        .collection(getString(R.string.collection_users))
        .document(FirebaseAuth.getInstance().getUid());

// 正确写法
DocumentReference newUserRef = mDb
        .collection(getString(R.string.collection_users))
        .document(FirebaseAuth.getInstance().getUid());

修正后的完整registerNewEmail方法 #

public void registerNewEmail(final String email, String password){

    showDialog();

    FirebaseAuth.getInstance().createUserWithEmailAndPassword(email, password)
            .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    Log.d(TAG, "createUserWithEmail:onComplete:" + task.isSuccessful());

                    if (task.isSuccessful()){
                        Log.d(TAG, "onComplete: AuthState: " + FirebaseAuth.getInstance().getCurrentUser().getUid());

                        //insert some default data
                        User user = new User();
                        user.setEmail(email);
                        user.setUsername(email.substring(0, email.indexOf("@")));
                        user.setUser_id(FirebaseAuth.getInstance().getUid());

                        // 修正后的文档引用声明
                        DocumentReference newUserRef = mDb
                                .collection(getString(R.string.collection_users))
                                .document(FirebaseAuth.getInstance().getUid());

                        newUserRef.set(user).addOnCompleteListener(new OnCompleteListener<Void>() {
                            @Override
                            public void onComplete(@NonNull Task<Void> task) {
                                hideDialog();

                                if(task.isSuccessful()){
                                    redirectLoginScreen();
                                }else{
                                    View parentLayout = findViewById(android.R.id.content);
                                    Snackbar.make(parentLayout, "Something went wrong.", Snackbar.LENGTH_SHORT).show();
                                }
                            }
                        });

                    }
                    else {
                        View parentLayout = findViewById(android.R.id.content);
                        Snackbar.make(parentLayout, "Something went wrong.", Snackbar.LENGTH_SHORT).show();
                        hideDialog();
                    }

                    // ...
                }
            });
}

内容的提问来源于stack exchange，提问作者Donny