游戏网格没有在Android工作室中输出？

我目前正在制作一个玩益智游戏哈希的Android应用程序。 我目前正在努力输出游戏网格。 我想输出像吼叫的二维数组 –

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色屏幕。

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); } } } } } 

Answer 1

要使您的板可见，您必须将代码从Drawboard移动到覆盖的方法onDraw，并且在onCreate方法中，您必须在类boardView的实例上调用invalidate（），该实例调用onDraw方法来更新屏幕，如果可见