未创建Sqlite数据库表

Question

我在Stack Overflow上尝试了一些解决方案。但它仍然无法正常工作。我也改变了db名称，就像Stack Overflow中的一篇文章中提到的那样。

DBHelper.java

var r = {
  username: '1',
  txt: '{"body":"Hi","date":"2016-07-29 07:43:00"}',
}; 

// parse the JSON string and get the object
var a = JSON.parse(r.txt);

console.log(a.body)

的manifest.xml

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;
import java.util.HashMap;


public class DBHelper extends SQLiteOpenHelper {

    public static final String DATABASE_NAME = "jobsBucketDBNew.db";
    //private static final int DATABASE_VERSION = 3;
    //public static final String JOBS_TABLE_PRIORITY="priority";
    public static final String JOBS_TABLE_NAME = "favtable";
    public static final String JOBS_COLUMN_ID = "id";
    public static final String JOBS_COLUMN_NAME = "name";
    public static final String JOBS_COLUMN_HEADER="header";
    public static final String JOBS_COLUMN_COMPANY="company";
    public static final String JOBS_COLUMN_CITY="city";
    public static final String JOBS_COLUMN_STATE="state";
    public static final String JOBS_COLUMN_COUNTRY="country";
    public static final String JOBS_COLUMN_FORMATEDLOCATION="formattedLocation";
    public static final String JOBS_COLUMN_SOURCE="source";
    public static final String JOBS_COLUMN_DATE="date";
    public static final String JOBS_COLUMN_SNIPPET="snippet";
    public static final String JOBS_COLUMN_URL="url";
    public static final String JOBS_COLUMN_ONMOUSEDOWN="onmousedown";
    public static final String JOBS_COLUMN_LATITUDE="latitude";
    public static final String JOBS_COLUMN_LONGITUDE="longitude";
    public static final String JOBS_COLUMN_JOBKEY="jobkey";
    public static final String JOBS_COLUMN_SPONSORED="sponsored";
    public static final String JOBS_COLUMN_EXPIRED="expired";
    public static final String JOBS_COLUMN_FORMATTEDLOCATIONFULL="formattedLocationFull";
    public static final String JOBS_COLUMN_FORMATTEDRELATIVETIME="formattedRelativeTime";
    public static final String JOBS_COLUMN_CHECKED ="checked";
    //SQLiteDatabase db= this.getWritableDatabase();
    private HashMap hp;


    public DBHelper(Context context)
    {

        super(context, DATABASE_NAME , null, 3);

       // this.onCreate(db);
    }

    @Override

    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub

       /* String create_table=  "create table" +" " + JOBS_TABLE_NAME  +
                        "("+ JOBS_COLUMN_ID +" integer primary key autoincrement," + JOBS_COLUMN_HEADER + " Text," + JOBS_COLUMN_NAME + " Text," + JOBS_COLUMN_COMPANY + " Text," + JOBS_COLUMN_CITY +" Text," + JOBS_COLUMN_STATE + " Text," + JOBS_COLUMN_COUNTRY + " Text," + JOBS_COLUMN_FORMATEDLOCATION + " Text," + JOBS_COLUMN_SOURCE + " Text," + JOBS_COLUMN_DATE+ " Text," + JOBS_COLUMN_SNIPPET+ " Text," + JOBS_COLUMN_URL + " Text," + JOBS_COLUMN_ONMOUSEDOWN + " Text," + JOBS_COLUMN_LATITUDE + " Text," + JOBS_COLUMN_LONGITUDE + " Text," + JOBS_COLUMN_JOBKEY + " Text," + JOBS_COLUMN_SPONSORED +" Text,"+ JOBS_COLUMN_EXPIRED +" Text," +JOBS_COLUMN_FORMATTEDLOCATIONFULL+ " Text," + JOBS_COLUMN_FORMATTEDRELATIVETIME + " Text," + JOBS_COLUMN_CHECKED +" Text" + ");";
        db.execSQL(create_table);*/
        db.execSQL(
                        "create table" +" " + JOBS_TABLE_NAME  +
                        "("+ JOBS_COLUMN_ID +" Integer primary key autoincrement," + JOBS_COLUMN_HEADER + " Text," + JOBS_COLUMN_NAME + " Text," + JOBS_COLUMN_COMPANY + " Text," + JOBS_COLUMN_CITY +" Text," + JOBS_COLUMN_STATE + " Text," + JOBS_COLUMN_COUNTRY + " Text," + JOBS_COLUMN_FORMATEDLOCATION + " Text," + JOBS_COLUMN_SOURCE + " Text," + JOBS_COLUMN_DATE+ " Text," + JOBS_COLUMN_SNIPPET+ " Text," + JOBS_COLUMN_URL + " Text," + JOBS_COLUMN_ONMOUSEDOWN + " Text," + JOBS_COLUMN_LATITUDE + " Text," + JOBS_COLUMN_LONGITUDE + " Text," + JOBS_COLUMN_JOBKEY + " Text," + JOBS_COLUMN_SPONSORED +" Text,"+ JOBS_COLUMN_EXPIRED +" Text," +JOBS_COLUMN_FORMATTEDLOCATIONFULL+ " Text," + JOBS_COLUMN_FORMATTEDRELATIVETIME + " Text," + JOBS_COLUMN_CHECKED +" Text" + ");"
        );
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + JOBS_TABLE_NAME + ";");
        onCreate(db);
        //db.execSQL("DROP TABLE IF EXISTS priorities");
        //onCreate(db);
    }

    public boolean insertContact( String header, String name,String company,String city,String state,String country,String formattedLocation,String source,String date,String snippet,String url,String onmousedown,String latitude,String longitude,String jobkey,String sponsored,String expired, String formattedLocationFull,String formattedRelativeTime)
    {
        SQLiteDatabase db =  this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
       // contentValues.put(JOBS_COLUMN_ID,id);
        contentValues.put(JOBS_COLUMN_HEADER,header);
        contentValues.put(JOBS_COLUMN_NAME, name);
        contentValues.put(JOBS_COLUMN_COMPANY, company);
        contentValues.put(JOBS_COLUMN_CITY, city);
        contentValues.put(JOBS_COLUMN_STATE, state);
        contentValues.put(JOBS_COLUMN_COUNTRY, country);
        contentValues.put(JOBS_COLUMN_FORMATEDLOCATION, formattedLocation);
        contentValues.put(JOBS_COLUMN_SOURCE, source);
        contentValues.put(JOBS_COLUMN_DATE, date);
        contentValues.put(JOBS_COLUMN_SNIPPET, snippet);
        contentValues.put(JOBS_COLUMN_URL, url);
        contentValues.put(JOBS_COLUMN_ONMOUSEDOWN, onmousedown);
        contentValues.put(JOBS_COLUMN_LATITUDE, latitude);
        contentValues.put(JOBS_COLUMN_LONGITUDE, longitude);
        contentValues.put(JOBS_COLUMN_JOBKEY, jobkey);
        contentValues.put(JOBS_COLUMN_SPONSORED, sponsored);
        contentValues.put(JOBS_COLUMN_EXPIRED, expired);
        contentValues.put(JOBS_COLUMN_FORMATTEDLOCATIONFULL, formattedLocationFull);
        contentValues.put(JOBS_COLUMN_FORMATTEDRELATIVETIME, formattedRelativeTime);
       // contentValues.put(JOBS_COLUMN_CHECKED, checked);
        long c = db.insert("favourites ", null, contentValues);
        if(c!=-1)
         return true;
        else
            return false;
    }
 public Cursor getData(int id){
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from "+JOBS_TABLE_NAME+"  where id="+id+";", null );
        return res;
    }

   /* public int numberOfRows(){
        SQLiteDatabase db = this.getReadableDatabase();
        int numRows = (int) DatabaseUtils.queryNumEntries(db, JOBS_TABLE_NAME);
        return numRows;
    }*/

    public boolean updateContact (Integer id, String name)
    {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put("name", name);

        db.update("favtable", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
        return true;
    }

    public Integer deleteContact (Integer id)
    {
        SQLiteDatabase db = this.getWritableDatabase();
        return db.delete("favtable",
                "id = ? ",
                new String[] { Integer.toString(id) });
    }

    public ArrayList<String> getAllCotacts()
    {
        ArrayList<String> array_list = new ArrayList<String>();

        //hp = new HashMap();
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from favtable", null );
        res.moveToFirst();

        while(res.isAfterLast() == false){
            array_list.add(res.getString(res.getColumnIndex(JOBS_COLUMN_NAME)));
            res.moveToNext();
        }
        return array_list;
    }
}

MarkAsFav.java

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="portfolio.first_app.practice.com.indeedjobactivity3">

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".DetailsActivity"
            android:label="Single Item Selected"></activity>
        <activity android:name=".MarkAsFav"
            android:label="Mark as Favourite"></activity>
        <!-- ATTENTION: This was auto-generated to add Google Play services to your project for
     App Indexing.  See https://g.co/AppIndexing/AndroidStudio for more information. -->
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
    </application>

</manifest>

我正在按照在线教程执行此操作。