SQLite DB在设备上创建/不可见（Moto G3）

Question

我正在尝试在我的测试设备Moto G3上创建一个SQLite数据库。我既没有收到任何错误也没有写任何数据。 提一下，我没有SD卡。

这是数据库助手类：

    package com.apptree.dingdong.database;


import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;


    public class DatabaseUserHandler extends SQLiteOpenHelper {

        private static final int DATABASE_VERSION = 3;
        private static final String DATABASE_NAME = "Dingdong.db";
        private static final String TABLE_USER_DATA = "user_data";

        // Contacts Table Columns names
        private static final String KEY_ID = "id";
        private static final String KEY_EMAIL_ID = "email";
        private static final String KEY_NAME = "name";

        public DatabaseUserHandler(Context context){
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
            Log.d("Snapper"," DatabaseUserHandler created ");
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            String CREATE_TABLE = "CREATE TABLE " + TABLE_USER_DATA + " ("
                    + KEY_ID + " INTEGER PRIMARY KEY," + KEY_EMAIL_ID + " TEXT,"
                    + KEY_NAME + " TEXT" + ");";

            db.execSQL(CREATE_TABLE);
            Log.d("Snapper"," DatabaseUserHandler onCreate called "+db.getPath().toString());
            Log.d("Snapper"," DatabaseUserHandler query "+CREATE_TABLE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXISTS " + TABLE_USER_DATA);
            onCreate(db);
        }

        public void addUser(UserData user) {
            Log.d("Snapper"," User created ");
            SQLiteDatabase db = this.getWritableDatabase();
            Log.d("Snapper"," DatabaseUserHandler db version "+db.getVersion());

            ContentValues values = new ContentValues();
            values.put(KEY_NAME, user.getName());
            values.put(KEY_EMAIL_ID, user.getEmail());
            // Inserting Row
            db.insert(TABLE_USER_DATA, null, values);
            db.close();
        }
    }

这里我在一个活动中初始化课程：

当我记录创建数据库的路径时。我得到以下不存在的路径（在Android Devie监视器中检查）。

  

数据/用户/ 0 / com.d.dingdong /数据库/ Dingdong.db

我缺少什么？