mBoardButtons无法解析为变量

Question

我是一个尝试将android井字游戏应用程序放在一起的java新手。 我有下面的代码，但不断收到有关我在监听器类中使用变量的错误。我的直觉是它可能是一个范围问题，但我不知道如何解决它。下面是完整的代码：

------------snip--------------------- 

package edu.harding.tictactoe; 

import android.app.Activity; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 


public class AndroidTicTacToeActivity extends Activity { 

    // Represents the internal state of the game 
    //a variable to make the game logic available in the Activity class - Elton. 
    private TicTacToeGame mGame; 

    // Buttons making up the board - Elton 
    private Button mBoardButtons[]; 

    // Various text displayed - Elton 
    private TextView mInfoTextView; 

    public int BOARD_SIZE = 8; 




    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_android_tic_tac_toe); 

     mBoardButtons = new Button[BOARD_SIZE]; //cheat by creating a local variable BOARD_SIZE. 
     mBoardButtons[0] = (Button) findViewById(R.id.one); 
     mBoardButtons[1] = (Button) findViewById(R.id.two); 
     mBoardButtons[2] = (Button) findViewById(R.id.three); 
     mBoardButtons[3] = (Button) findViewById(R.id.four); 
     mBoardButtons[4] = (Button) findViewById(R.id.five); 
     mBoardButtons[5] = (Button) findViewById(R.id.six); 
     mBoardButtons[6] = (Button) findViewById(R.id.seven); 
     mBoardButtons[7] = (Button) findViewById(R.id.eight); 
     mBoardButtons[8] = (Button) findViewById(R.id.nine); 

     mInfoTextView = (TextView) findViewById(R.id.information); 

     mGame = new TicTacToeGame(); 

     startNewGame(); //start a new game - Elton. 

    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.android_tic_tac_toe, menu); 
     return true; 
    } 

    //a method to start anew game - Elton 
// Set up the game board. 
    private void startNewGame() {  

     mGame.clearBoard(); //clear the board - Elton 

     // Reset all buttons 
     for (int i = 0; i < mBoardButtons.length; i++) { 
      mBoardButtons[i].setText(""); 
      mBoardButtons[i].setEnabled(true);  
      mBoardButtons[i].setOnClickListener(new ButtonClickListener(i)); 
     } 

    // Human goes first 
     mInfoTextView.setText("You go first."); 
     } 

    private void setMove(char player, int location) { 

     mGame.setMove(player, location); 
     mBoardButtons[location].setEnabled(false); 
     mBoardButtons[location].setText(String.valueOf(player)); 
     if (player == TicTacToeGame.HUMAN_PLAYER) 
      mBoardButtons[location].setTextColor(Color.rgb(0, 200, 0));    
     else 
      mBoardButtons[location].setTextColor(Color.rgb(200, 0, 0)); 
    } 

} 

//Handles clicks on the game board buttons 
class ButtonClickListener implements View.OnClickListener { 
int location; 

public ButtonClickListener(int location) { //this is a constructor. 
    this.location = location; 
} 

public void onClick(View view) { 
    if (mBoardButtons[location].isEnabled()) { 
      setMove(TicTacToeGame.HUMAN_PLAYER, location);    

      // If no winner yet, let the computer make a move 
      int winner = mGame.checkForWinner(); 
      if (winner == 0) { 
      mInfoTextView.setText("It's Android's turn."); 
      int move = mGame.getComputerMove(); 
      setMove(TicTacToeGame.COMPUTER_PLAYER, move); 
      winner = mGame.checkForWinner(); 
     } 

     if (winner == 0) 
      mInfoTextView.setText("It's your turn."); 
     else if (winner == 1) 
       mInfoTextView.setText("It's a tie!"); 
      else if (winner == 2) 
       mInfoTextView.setText("You won!"); 
     else 
       mInfoTextView.setText("Android won!"); 
    } 
}  
} 


-----------------snap---------------------------------------- 



The errors I get are: 

mBoardButtons cannot be resolved to a variable 
The method setMove(char, int) is undefined for the type ButtonClickListener 
mGame cannot be resolved 
mInfoTextView cannot be resolved 
The method setMove(char, int) is undefined for the type ButtonClickListener 

All the above errors appear in the onClick() method of the listener. 

Please help. 

Answer 1

mGame因为ButtonClickListener类，但在AndroidTicTacToeActivity没有定义不能得到解决。你应该从不同的部分访问游戏：通常在游戏中，你需要将游戏状态类作为单例实现。

mInfoTextView原因相同，不属于ButtonClickListener类定义的一部分，因此您无法直接访问它。

setMove以及AndroidTicTacToeActivity类的私有方法，所以您不能在该范围之外使用它。

您应该仔细检查游戏和类的设计，可能会在整个架构中创建不同的“模块”，并暴露其他组件使用的正确功能和属性。