导入 Firestore 和实现 addOnSuccessListener 的问题

Question

我正在尝试使用 Cloud Firestore 来保存用户数据。我正在尝试https://firebase.google.com/docs/firestore/quickstart中显示的示例

你能告诉我缺少什么吗？

构建文件中的依赖项

dependencies {

    api files('libs/AudienceNetwork.jar')

    api files('libs/FacebookAdapter.jar')

    implementation 'com.android.support:multidex:1.0.3'

    implementation 'com.google.android.exoplayer:exoplayer:r2.4.2'

    implementation 'com.android.support:support-v13:28.0.0'

    implementation 'com.facebook.android:facebook-android-sdk:[4,5)'

    implementation 'com.google.android.gms:play-services-auth:16.0.1'

    implementation 'com.google.android.gms:play-services-drive:16.0.0'

    implementation 'com.google.android.gms:play-services-tasks:16.0.1'

    implementation 'com.google.firebase:firebase-core:16.0.6'

    implementation 'com.google.firebase:firebase-ads:17.1.2'

    implementation 'com.google.firebase:firebase-appindexing:17.1.0'

    implementation 'com.google.firebase:firebase-firestore:17.1.5'

}

进口

import com.google.firebase.analytics.FirebaseAnalytics;

import com.google.firebase.firestore.DocumentReference;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.firestore.CollectionReference;

import com.google.android.gms.tasks.OnSuccessListener; 

import android.app.Activity;

import android.app.AlertDialog;

import android.app.DatePickerDialog;

import android.content.ActivityNotFoundException;

import android.content.Context;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.content.pm.Signature;

import android.graphics.Bitmap;

import android.graphics.Color;

import android.graphics.Point;

import android.graphics.Rect;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.net.Uri;

import android.os.AsyncTask;

import android.os.Build;

import android.os.Bundle;

import android.os.Environment;

import android.support.annotation.NonNull;

Answer 1

为了解决这个问题，您需要再导入一个类和一个接口，以便调用addOnSuccessListener()对象CollectionReference并将OnSuccessListener对象作为参数传递。import com.google.firebase.firestore.CollectionReference; import com.google.android.gms.tasks.OnSuccessListener;