游戏网格未在 Android Studios 中输出?

问题描述

我目前正在制作一款玩益智游戏 hashi 的安卓应用.我目前正在努力输出游戏网格.我想输出一个二维数组，如下所示-

I am currently making an android app which plays the puzzle game hashi. I am currently struggling to output the game grid. i want to output a 2d array like bellow-

1  0  0  0  1
0  2  0  0  2
2  0  3  0  1
0  0  0  0  0
0  0  2  0  2

但是，当我在模拟器中运行应用程序时，它只输出一个空白的白屏.

however when i run the application in the emulator it outputs just a blank white screen.

主要活动-

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new boardView(this));
    //sets the view to the board view to show the puzzle on open.
    client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}

游戏板类-

public class boardView extends View {

    public float IslandX;
    public float IslandY;
    public int islandDiameter;

    private Canvas canvas;

    public boardView(Context context) {
        super(context);
    }
    int gameBoard[][] = {{0, 1, 0, 0, 1}, {0, 2, 0, 0, 2}, {2, 0, 3, 0, 1}, {0, 0, 0, 0, 0}, {0, 0, 2, 0, 2}};
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)

    public void DrawBoard(Canvas canvas){
        Paint Island = new Paint();
        Island.setStyle(Paint.Style.FILL);

        Island.setStyle(Paint.Style.FILL);

        float stepX = canvas.getWidth() / 5.f;
        float stepY = canvas.getHeight() / 5.f;

        for (int i = 0; i < 5; i++) {
            for (int R = 0; R < 5; R++) {
                IslandX = i * stepX;
                IslandY = R * stepY;
                if (gameBoard[i][R] == 0) {
                    Island.setColor(Color.BLUE);
                    canvas.drawOval(IslandX, IslandY, 50, 50, Island);

                } else if (gameBoard[i][R] == 1) {
                    Island.setColor(Color.BLACK);
                    canvas.drawOval(IslandX, IslandY, 50, 50, Island);

                } else if (gameBoard[i][R] == 2) {
                    Island.setColor(Color.BLUE);
                    canvas.drawOval(IslandX, IslandY, 50, 50, Island);

                }


            }
        }

        }

}

推荐答案

为了让你的板子可见，你必须将你的代码从 Drawboard 移到被覆盖的方法 onDraw 中，并且在 onCreate 方法中，你必须调用 invalidate() on类 boardView 的一个实例，它调用 onDraw 方法来更新屏幕(如果可见).

To make your board visible, you have to move your code from Drawboard to the overwritten method onDraw and in the onCreate method, you have to call invalidate() on an instance of the class boardView, that calls the onDraw method to update the screen, if visible.

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