將單個字符串值從sqlite數據庫類傳遞給android中的另一個類？

Question

我正在做一個android的hangman應用程序我的問題是，我需要從我的數據庫類傳入一個單詞到我的遊戲類，我知道遊戲類的作品，因爲我創建它只是最初使用數組列表，然後我創建了一個我也知道的數據庫類，因爲我可以爲它添加單詞並查看它們。

的問題是，我似乎無法從我的數據庫類傳遞一個字通過對我的遊戲類的，我已經在這個現在用了3天，嘗試了很多不同的東西，但沒有運氣，任何幫助，可能是因爲我覺得我可能需要很快將我的補習投入窗外。

這是我的數據庫類

package com.example.hangpract; 



import java.util.ArrayList; 
import java.util.Random; 

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

public class mysteryWordDB { 


    public static final String KEY_WORD="mystery_word"; 

    public static ArrayList<String> results = new ArrayList<String>(); 
    private static final String DATABASE_NAME="HangManWords"; 
    private static final String DATABASE_TABLE="wordsTable"; 
    private static final int DATABASE_VERSION= 1; 

    private DbHelper ourHelper; 
    private final Context ourContext; 
    private static SQLiteDatabase ourDatabase; 

    private static class DbHelper extends SQLiteOpenHelper{ 

     public DbHelper(Context context) { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
      // TODO Auto-generated constructor stub 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) { 
      // TODO Auto-generated method stub 
      db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + 
        KEY_WORD + " TEXT NOT NULL);" 
        ); 


     } 

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

     } 

    } 

public mysteryWordDB(Context c){ 
    ourContext = c; 
} 

public mysteryWordDB open()throws SQLException{ 
    ourHelper = new DbHelper(ourContext); 
    ourDatabase = ourHelper.getWritableDatabase(); 
    return this; 
} 

public void close(){ 
    ourHelper.close(); 
} 
//method to add user words from the edit word class 

public long createEntry(String word) { 
    // TODO Auto-generated method stub 
    ContentValues cv = new ContentValues(); 
    cv.put(KEY_WORD, word); 
    return ourDatabase.insert(DATABASE_TABLE, null, cv); 

} 
//method to display all words in the view class 

public String getData() { 
    // TODO Auto-generated method stub 
    String[] columns = new String[]{KEY_WORD}; 
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); 
    String result = ""; 


    int iWord = c.getColumnIndex(KEY_WORD); 

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){ 
     result = result + c.getString(iWord) + "\n"; 
    } 
    return result; 
} 

//method that should set up an array of the words in the data base, can't get this bit right 

public void getMysteryWord() { 
    Cursor c = ourDatabase.rawQuery("SELECT KEY_WORD FROM " + 
      DATABASE_TABLE, null); 

    if (c != null) { 
     if (c.moveToFirst()) { 
      do { 
       String mystWord = c.getString(c.getColumnIndex(KEY_WORD)); 

       results.add(mystWord.toString()); 
      }while (c.moveToNext()); 
     }} 
    } 



//method that is called from the game class to get a random string from the array to use in the game 

    public static String word(){ 
     Random rand = new Random(); 
    int i=rand.nextInt(results.size()); 
    if(i >-1)return results.get(i); 

    return results.get(i); 

} 
} 

問題區域與我已經嘗試了最新的方法是是：

//method that should set up an array of the words in the data base, can't get this bit right 

public void getMysteryWord() { 
    Cursor c = ourDatabase.rawQuery("SELECT KEY_WORD FROM " + 
      DATABASE_TABLE, null); 

    if (c != null) { 
     if (c.moveToFirst()) { 
      do { 
       String mystWord = c.getString(c.getColumnIndex(KEY_WORD)); 

       results.add(mystWord.toString()); 
      }while (c.moveToNext()); 
     }} 
    } 



//method that is called from the game class to get a random string from the array to use in the game 

    public static String word(){ 
     Random rand = new Random(); 
    int i=rand.nextInt(results.size()); 
    if(i >-1)return results.get(i); 

    return results.get(i); 

} 
} 

，然後這是遊戲類需要它傳遞一個隨機的KEY_WORD實例：

package com.example.hangpract; 




import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.TextView; 



    public class game extends Activity implements OnClickListener { 


     private ImageView hangimg; 
     private TextView word; 
     private String mysteryWord = mysteryWordDB.word(); 
     private int numWrongGuesses; 


     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.game); 

      bindviews(); 
      inistMystword(); 
      initWrongGuesses(); 



      //set button views for letters 
      Button aButton = (Button) 
        this.findViewById(R.id.buttonA); 

        aButton.setOnClickListener(this); 


      Button bButton = (Button) 
        this.findViewById(R.id.buttonB); 

        bButton.setOnClickListener(this); 

      Button cButton = (Button) 
        this.findViewById(R.id.buttonC); 

        cButton.setOnClickListener(this); 

      Button dButton = (Button) 
        this.findViewById(R.id.buttonD); 

        dButton.setOnClickListener(this); 

      Button eButton = (Button) 
        this.findViewById(R.id.buttonE); 

        eButton.setOnClickListener(this); 

      Button fButton = (Button) 
        this.findViewById(R.id.buttonF); 

        fButton.setOnClickListener(this); 

      Button gButton = (Button) 
        this.findViewById(R.id.buttonG); 

        gButton.setOnClickListener(this); 

      Button hButton = (Button) 
        this.findViewById(R.id.buttonH); 

        hButton.setOnClickListener(this); 

      Button iButton = (Button) 
        this.findViewById(R.id.buttonI); 

        iButton.setOnClickListener(this); 

      Button jButton = (Button) 
        this.findViewById(R.id.buttonJ); 

        jButton.setOnClickListener(this); 

      Button kButton = (Button) 
        this.findViewById(R.id.buttonK); 

        kButton.setOnClickListener(this); 

      Button lButton = (Button) 
        this.findViewById(R.id.buttonL); 

        lButton.setOnClickListener(this); 

      Button mButton = (Button) 
        this.findViewById(R.id.buttonM); 

        mButton.setOnClickListener(this); 

      Button nButton = (Button) 
        this.findViewById(R.id.buttonN); 

        nButton.setOnClickListener(this); 

      Button oButton = (Button) 
        this.findViewById(R.id.buttonO); 

        oButton.setOnClickListener(this); 

      Button pButton = (Button) 
        this.findViewById(R.id.buttonP); 

        pButton.setOnClickListener(this); 

      Button qButton = (Button) 
        this.findViewById(R.id.buttonQ); 

        qButton.setOnClickListener(this); 

      Button rButton = (Button) 
        this.findViewById(R.id.buttonR); 

        rButton.setOnClickListener(this); 

      Button sButton = (Button) 
        this.findViewById(R.id.buttonS); 

        sButton.setOnClickListener(this); 

      Button tButton = (Button) 
        this.findViewById(R.id.buttonT); 

        tButton.setOnClickListener(this); 

      Button uButton = (Button) 
        this.findViewById(R.id.buttonU); 

        uButton.setOnClickListener(this); 

      Button vButton = (Button) 
        this.findViewById(R.id.buttonV); 

        vButton.setOnClickListener(this); 

      Button wButton = (Button) 
        this.findViewById(R.id.buttonW); 

        wButton.setOnClickListener(this); 

      Button xButton = (Button) 
        this.findViewById(R.id.buttonX); 

        xButton.setOnClickListener(this); 

      Button yButton = (Button) 
        this.findViewById(R.id.buttonY); 

        yButton.setOnClickListener(this); 

      Button zButton = (Button) 
        this.findViewById(R.id.buttonZ); 

        zButton.setOnClickListener(this); 




      //sets button view for new game 
      Button newbutton = (Button) 
        this.findViewById(R.id.buttNew); 
        newbutton.setOnClickListener(this); 
      //sets button view for menu 
      Button menuButton = (Button) 
        this.findViewById(R.id.buttMenu); 
        menuButton.setOnClickListener(this); 
     } 


     //set actions on buttons 
     public void onClick(View v) { 
      switch (v.getId()) { 
      case R.id.buttonA: 

       validate('a'); 
        break; 
       case R.id.buttonB: 

       validate('b'); 
       break; 
       case R.id.buttonC: 

        validate('c'); 
        break; 
       case R.id.buttonD: 

        validate('d'); 
        break; 

       case R.id.buttonE: 

        validate('e'); 
        break; 

       case R.id.buttonF: 

        validate('f'); 
        break; 

       case R.id.buttonG: 

        validate('g'); 
        break; 

       case R.id.buttonH: 

        validate('h'); 
        break; 

       case R.id.buttonI: 

        validate('i'); 
        break; 

       case R.id.buttonJ: 

        validate('j'); 
        break; 

       case R.id.buttonK: 

        validate('k'); 
        break; 

       case R.id.buttonL: 

        validate('l'); 
        break; 

       case R.id.buttonM: 

        validate('m'); 
        break; 

       case R.id.buttonN: 

        validate('n'); 
        break; 

       case R.id.buttonO: 

        validate('o'); 
        break; 

       case R.id.buttonP: 

        validate('p'); 
        break; 

       case R.id.buttonQ: 

        validate('q'); 
        break; 

       case R.id.buttonR: 

        validate('r'); 
        break; 

       case R.id.buttonS: 

        validate('s'); 
        break; 

       case R.id.buttonT: 

        validate('t'); 
        break; 

       case R.id.buttonU: 

        validate('u'); 
        break; 

       case R.id.buttonV: 

        validate('v'); 
        break; 

       case R.id.buttonW: 

        validate('w'); 
        break; 

       case R.id.buttonX: 

        validate('x'); 
        break; 

       case R.id.buttonY: 

        validate('y'); 
        break; 

       case R.id.buttonZ: 

        validate('z'); 
        break; 




      case R.id.buttNew: 


       Intent newGame = new Intent(v.getContext(), game.class); 
       startActivityForResult(newGame,0); 

      break; 

      case R.id.buttMenu: 
       Intent menu = new Intent(v.getContext(), MainActivity.class); 
       startActivityForResult(menu,0); 

      } 


     } 
     //get mystery word 
     public void inistMystword(){ 
      word = (TextView) findViewById(R.id.mysteryword); 
      word.setText(mysteryWord); 

      word.setText(underscore()); 
     } 


     //method to display the mystery word as underscores 
     public String underscore() { 
      StringBuffer result = new StringBuffer(); 
      for (int i = 0; i < mysteryWord.length(); i++) { 
      result.append("_ "); 
      } 
      return result.toString(); 
      } 


     //method to validate guess 



     private void validate(char ch) { 
      if (mysteryWord.indexOf(ch)== -1){ 


       if (numWrongGuesses < 6){ 
        numWrongGuesses++; 
       } 
       checkLose(); 
       } 
      else { 
      if (numWrongGuesses <6){ 
       updateMystWord(ch); 
       checkWin(); 
      } else { 
       checkLose(); 
      } 

     }} 






      //method to reveal letter 

      private void updateMystWord(char ch) { 
       char[] updatedWord = 
       word.getText().toString().toCharArray(); 
       for (int i = 0; i < mysteryWord.length(); i++) { 

       if (ch == mysteryWord.charAt(i)) 
       updatedWord[i * 2] = mysteryWord.charAt(i); 
       word.setText(new String(updatedWord)); 

       } 



      } 
      //sets number of wrong guesses to zero at game start 
     private void initWrongGuesses() { 
      numWrongGuesses = 0; 
     } 




     //checks when game is lost and displays lose screen 

     private void checkLose() { 
      if (numWrongGuesses == 6) 
       hangimg.setImageResource(R.drawable.lose); 


      } 
     //checks when game is won and displays win screen 
     private void checkWin() { 
      if (word.getText().toString().indexOf("_") == -1) { 
      hangimg.setImageResource(R.drawable.win); 
      } 
      } 
     //binds the views 
     private void bindviews(){ 
      hangimg = (ImageView) 
        this.findViewById(R.id.imageView1); 
     } 

     } 

遊戲類肯定有效，數據庫al如此作品，我只是無法弄清楚我在錯誤的地方嘗試傳遞一個單一的值在遊戲類中使用任何幫助都將不勝感激。

Answer 1

在數據庫文件中創建一個方法。

static String str = "data"; // ASSUME TO PASS THIS STRING 

public static String passData() 
{ 
    return str; 
} 

在您的活動來實現這個目的。

String str = dbClassName.passData(); 

完蛋了。