Question

我正在开发一个测验游戏，但我有一个现有的数据库文件，其中有问题和选择..我怎么能在我的程序中连接它。怎么可能，我执行查询以在TextView中显示我的问题和按钮中的选项。

Answer 1

制作测验游戏的分步指南：

第1步：

首先从SQLite Manager创建数据库。制作1列主要索引，第2列问题，＆amp; 选项的第3，第4，第5，第6列。还有一列用于正确答案的相同字符串（用于正确答案的比较）。应该像图中所示：

enter image description here

将此filename.sqlite复制粘贴到资源文件夹

中

第2步：

为获取和设置数据库创建一个新的Getter Setters类。It should consists of all the fields that you are trying to fetch.

第3步：

创建一个扩展SQLiteOpenHelper的DBAdapter类。使用此代码：

public class DBAdapter extends SQLiteOpenHelper
{
static String name = "kbcquiz.sqlite";
static String path = "";
static ArrayList<kbc> a;
static SQLiteDatabase sdb;

@Override
public void onCreate(SQLiteDatabase db)
{
    // Your database is already Created, so no need to add anything here
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
    //  Database Not upgraded here
} 

private DBAdapter(Context v) 
{
    super(v, name, null, 1);
    path = "/data/data/" + v.getApplicationContext().getPackageName() + "/databases";
}

public boolean checkDatabase()
{
    SQLiteDatabase db = null;
    try 
    {
        db = SQLiteDatabase.openDatabase(path + "/" + name, null, SQLiteDatabase.OPEN_READONLY);
    } catch (Exception e) 
    {
        e.printStackTrace();
    }
    if (db == null) 
    {
        return false;
    } 
    else
    {
        db.close();
        return true;
    }
}

public static synchronized DBAdapter getDBAdapter(Context v)
{
    return (new DBAdapter(v));
}

public void createDatabase(Context v) 
{
    this.getReadableDatabase();
    try
    {
        InputStream myInput = v.getAssets().open(name);
        // Path to the just created empty db
    String outFileName = path +"/"+ name;
        // Open the empty db as the output stream
    OutputStream myOutput = new FileOutputStream(outFileName);
        // transfer bytes from the inputfile to the outputfile
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer)) > 0) 
    {
        myOutput.write(buffer, 0, length);
    }
        // Close the streams
    myOutput.flush();
    myOutput.close();
    myInput.close();
                } catch (IOException e) 
    {
        System.out.println(e);
    }
}

public void openDatabase() 
{
    try 
    {
        sdb = SQLiteDatabase.openDatabase(path + "/" + name, null,
                SQLiteDatabase.OPEN_READWRITE);
    } catch (Exception e) 
     {
        System.out.println(e);
    }
}

    // Method for fetching Data and storing it into ArrayList

    public ArrayList<kbc> getQuestions() 
 {
           //question is the table name, you can also use "SELECT * FROM question" in case 
     Cursor c1 = sdb.rawQuery("SELECT * FROM question ORDER BY RANDOM()", null);
     a = new ArrayList<kbc>();
     while (c1.moveToNext())
    {
        kbc q1 = new kbc(); // kbc is the getter setter class
        //the below code can vary upon ur getter-setter methods & variables
        q1.setSno(c1.getInt(0));
        q1.setQuestion(c1.getString(1));
        q1.setA(c1.getString(2));
        q1.setB(c1.getString(3));
        q1.setC(c1.getString(4));
        q1.setD(c1.getString(5));
        q1.setAnswer(c1.getString(6));

                    a.add(q1);//--Always remember to add the fetched elements of type ArrayList<GetterGetter>
    }
    return a;
}
}

第4步：

在MainActivity中使用此POC

      DBAdapter db = DBAdapter.getDBAdapter(getApplicationContext());
    if (!db.checkDatabase()) 
    {
        db.createDatabase(getApplicationContext());
    }
    db.openDatabase();
     q = db.getQuestions();

要从arraylist中获取任何字符串，请使用q.get(0).getQuestion(),q.get(0).getA(),q.get(0).getB(),q.get(0).getC(),q.get(0).getD()

更改索引以获得不同的colums＆amp;将该文本设置为TextView或Button。

单击选择答案，您可以通过

检查正确性

if(btn4.getText().toString().equals(q.get(e).getAnswer().toString()))
{
 // correct answer
     //Use it for changing color,managing indexing, etc..
}

输出： enter image description here

希望这有帮助！干杯

Eclipse中的连接数据库（SQLITE）文件（Android）

1 个答案: