Question

我正在开发一个Android版的Gomoku。我对Java很新，对Android也是如此。我正在关注一本名为“Hello Android”的书，其中作者通过制作数独游戏来教授基础知识。我松散地跟着它，遗漏了我的Gomoku不需要的功能。然而，当新游戏被按下时会产生一个新的视图，尽管这本书仍在继续，好像它应该正常工作，应该绘制的内容根本不适合我。以下是处理这些内容的代码：

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);
        }

    }
}

我尝试将作者的代码与我的代码进行比较，除非我没有实现功能，否则代码似乎是匹配的。但是，Log.d（TAG，“onSizeChanged：width”+ width +“，height”+ height）;没有出现在LogCat中所以我认为这个函数根本就没有被调用过，我不明白为什么。

Answer 1

您需要将视图设置为setContentView(gameView) onCreate活动中Game的活动。

@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

Answer 2

您只需创建GameView的实例，但不要将其添加到您的活动中。通过使用

执行此操作

setContentView(gameView);

你的onCreate方法中的

。

Android自定义视图无法显示

2 个答案: