如何从对话框返回无效（）？

Question

我有一个绘图画布，其中有一个OnTouchListener，我将其称为AlertDialog。

在对话框中，我重置画布的底层数据（或不依赖于用户）。在回到画布dialog.cancel()画布不重画，我希望它。
这意味着用户必须点击画布才能重画 - 不好！

由于该对话框异步运行，任何在画布中调用invalidate()的操作都会在对话框返回已更改的基础数据之前完成。我做任何尝试无效或从对话框按钮代码内引用画布导致错误。我似乎在赶上22！

可以enyone给我建议吗？

对话框代码：

case DIALOG_NEW_ID: 
    AlertDialog.Builder builder5 = new AlertDialog.Builder(this); 
    builder5.setMessage("  WARNING" + 
      "\nYour current game will be lost") 
    .setCancelable(false) 
    .setPositiveButton("Cancel", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) {     
      dialog.cancel(); 
     } 
    })    
    .setNegativeButton("Continue", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) { 
      cells.reset(); 
      gameMode = 0; 
      dialog.cancel(); 
     } 
    }); 
    AlertDialog alert5 = builder5.create();    
    alert5.setOnDismissListener(new DialogInterface.OnDismissListener() { 
     public void onDismiss(DialogInterface dialog) { 
      Log.d(TAG, "Dialog cancelled");// debug log entry 
      //myBoard.invalidate(); 
     } 
    });  
    dialog = alert5;     
    break; 

对话框调用代码onTouch在画布：

case MODE_SOLUTION: 
     break; 
    default:        
     showDialog(DIALOG_NEW_ID); 
     invalidate(); 
}// end switch 

主类设置：

public class SudokuGame extends Activity { 
static final int DIALOG_OPEN_ID = 0; 
static final int DIALOG_INFO_ID = 1; 
static final int DIALOG_FAIL_ID = 2; 
static final int DIALOG_SAVE_ID = 3; 
static final int DIALOG_NEW_ID = 4; 
static final int MODE_ENTRY = 0; 
static final int MODE_PLAY = 1; 
static final int MODE_SHOW_ERRORS = 3; 
static final int MODE_SOLUTION = 4; 
final String TAG = "Game"; 
int gameMode; 
SKU cells; 
View myBoard; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_LEFT_ICON); 
    View myBoard = new NewBoard(this);   
    setContentView(myBoard); 
    setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, R.drawable.ic_launcher); 
    showDialog(DIALOG_OPEN_ID);   
}// end onCreate 

    protected Dialog onCreateDialog(int id) { 

的Class NewBoard其嵌套在主类：

class NewBoard extends View implements OnTouchListener{ 
    int cW; // canvas width 
    int cH; // canvas height 
    int cellSize,textSize; 
    int boardX,boardY; 
    int runner, tX, tY,pX,pY,selectorX,selectorY; 
    int gap ; 
    int btn1X,btn1Y, selected; 
    int infoButtonX, infoButtonY,quitButtonX,quitButtonY; 
    boolean btn1Pressed, btn2Pressed, btn3Pressed, btn4Pressed, btn5Pressed; 
    String btn1,btn2,btn3,btn4,btn5; 

    public NewBoard(Context context){ // NewBoard Constructor 
     super(context); 
     this.setOnTouchListener(this); 
     cells = new SKU(); 
     readStateStore(); 
    }// end NewBoard Constructor 

    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 
     Paint paint = new Paint(); 
     Rect textRect = new Rect();  

Answer 1

两种可能性：

• 使对话框不可撤销
• 设置OnCancelListener的对话框，将然后调用invalidate（）。

Answer 2

你可以用对话框和invalidate（）来发布你的情况的一些代码，并返回错误信息吗？

我不明白你为什么不能做以下（即无效一个MapView对话框）：

AlertDialog.Builder builderAccountInfo = new AlertDialog.Builder(this); 
     builderAccountInfo.setMessage("TEST") 
     .setCancelable(false) 
     .setTitle("TEST") 
     .setPositiveButton("Ok", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) { 
      changeUserCanvas(); 
      mapView.invalidate(); 
      dialog.cancel(); 
     } 
    }); 
     AlertDialog alertAccountInfo = builderAccountInfo.create(); 

     alertAccountInfo.show(); 

该错误可能会来自你使用无效的情况下，更有关您正在制作的画布更改的信息以及对话框代码是必需的。

////////////////////////////////编辑

它看起来像有是之间的问题查看myBoard的本地和全局变量。

public class SudokuGame extends Activity { 
static final int DIALOG_OPEN_ID = 0; 
static final int DIALOG_INFO_ID = 1; 
static final int DIALOG_FAIL_ID = 2; 
static final int DIALOG_SAVE_ID = 3; 
static final int DIALOG_NEW_ID = 4; 
static final int MODE_ENTRY = 0; 
static final int MODE_PLAY = 1; 
static final int MODE_SHOW_ERRORS = 3; 
static final int MODE_SOLUTION = 4; 
final String TAG = "Game"; 
int gameMode; 
SKU cells; 
View myBoard; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_LEFT_ICON); 
    View myBoard = new NewBoard(this);   
    setContentView(myBoard); 
    setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, R.drawable.ic_launcher); 
    showDialog(DIALOG_OPEN_ID);   
}// end onCreate 

查看myBoard中的onCreate本地初始化，但全球视野myBoard尚未因局部范围初始化。你有两个myBoard变量，只有一个被初始化。要快速解决这个问题，我会改变：

View myBoard = new NewBoard(this); 

到

myBoard = new NewBoard(this);