Android自定義視圖不顯示

我正在使用Gomoku的Android版本。對於Java來說，我是一個新手，對於Android來說更是如此。我正在關注一本名爲「Hello Android」的書，作者通過製作Sudoku遊戲來教授基本知識。我在鬆散地跟蹤它，忽略了我的Gomoku不需要的功能。然而，當新遊戲被按下時，一個新的觀點被提出，儘管這本書繼續下去，好像它應該有效，但是應該繪製的東西根本不會顯示出來。下面是與東西打交道的代碼：Android自定義視圖不顯示

Mainactivity.java：

private void startGame() { 
    Log.d(TAG, "Clicked New Game"); 
    Intent intent = new Intent(this, Game.class); 
    startActivity(intent); 
}

Game.java：

public class Game extends Activity { 
    private static final String TAG = "Game"; 
    private int board[] = new int[10 * 10]; 
    private GameView gameView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     Log.d(TAG, "Game.onCreate called"); 
     gameView = new GameView(this); 
     gameView.requestFocus(); 
     Log.d(TAG, "Game.onCreate finished"); 
    } 
}

GameView.java：

public class GameView extends View { 
    private static final String TAG = "Game"; 
    private float width; //Width of one tile 
    private float height; //Height of one tile 
    private final Game game; 
    Paint background = new Paint(); 
    Paint dark = new Paint(); 
    Paint light = new Paint(); 
    Paint hilite = new Paint(); 

    public GameView(Context context) { 
     super(context); 
     this.game = (Game) context; 
     setFocusable(true); 
     setFocusableInTouchMode(true); 
     Log.d(TAG, "GameView finished"); 
    } 

    @Override 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
     super.onSizeChanged(w, h, oldw, oldh); 
     width = w/10f; 
     height = h /10f; 
     Log.d(TAG, "onSizeChanged: width " + width + ", height " + height); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     //Draw the background 
     background.setColor(getResources().getColor(R.color.background)); 
     canvas.drawRect(0, 0, getWidth(), getHeight(), background); 
     //Draw the board 
     //Define colors for grid lines 
     dark.setColor(getResources().getColor(Color.DKGRAY)); 
     light.setColor(getResources().getColor(Color.LTGRAY)); 
     hilite.setColor(getResources().getColor(Color.WHITE)); 
     for (int i = 0; i < 10; i++) { 
      Log.d(TAG, "Drawing..."); 
      canvas.drawLine(0, i * height - 1, getWidth(), i * height - 1, light); 
      canvas.drawLine(0, i * width - 1, getHeight(), i * width - 1, light); 
      canvas.drawLine(0, i * height, getWidth(), i * height, hilite); 
      canvas.drawLine(0, i * width, getHeight(), i * width, hilite); 
      canvas.drawLine(0, i * height + 1, getWidth(), i * height + 1, dark); 
      canvas.drawLine(0, i * width + 1, getHeight(), i * width + 1, dark); 
     } 

    } 
}

我曾嘗試將作者的代碼與我的代碼進行比較，除非我沒有實現功能，否則代碼似乎是匹配的。但是，Log.d（TAG，「onSizeChanged：width」+ width +「，height」+ height）;不會出現在LogCat中，所以我認爲這個函數根本就不會被調用，我不明白爲什麼。

來源

2013-11-21 Praxbyr

您只是創建了一個GameView的實例，但不會將其添加到您的活動中。通過在您的onCreate方法中使用

setContentView(gameView);

。

來源

2013-11-21 16:21:47 mvieghofer

您需要將視圖設置爲setContentView(gameView)的活動onCreate的Game活動。

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.d(TAG, "Game.onCreate called"); 
    gameView = new GameView(this); 
    setContentView(gameView); // missing 
    ...//rest of the code

來源

2013-11-21 16:20:46 Raghunandan

Android自定義視圖不顯示

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