在 Android Java 编程中使用枚举

Question

我正在尝试用 android 编写游戏，我想使用枚举。

这是我的枚举 class:

public enum State {
   INACTIVE(0), ACTIVE(1);

  private final int value;

  private State(int value){
      this.value = value;
  }

  public int getValue() {
      return value;
  }
}

然后我想在我的方法和构造函数中使用枚举：

public FieldsGame(){
    Board = new char[BOARD_SIZE_VERTICAL][BOARD_SIZE_HORIZONTAL];
    for (int i = 0; i < BOARD_SIZE_VERTICAL; i++) {
        for (int j = 0; j < BOARD_SIZE_HORIZONTAL; j++) {
            Board[i][j] = EMPTY_SPACE;
            BoardState[i][j] = State.INACTIVE.getValue();
        }
    }
}

public void clearBoard() {
    for (int i = 0; i < BOARD_SIZE_VERTICAL; i++) {
        for (int j = 0; j < BOARD_SIZE_HORIZONTAL; j++) {
            Board[i][j] = EMPTY_SPACE;
            BoardState[i][j] = State.INACTIVE.getValue();
        }
    }
}

当我尝试启动我的应用程序时，它说 "Unfortunatelly, application has stopped." 当我评论这两行时，我确定这是因为枚举原因：

BoardState[i][j] = State.INACTIVE.getValue();

在我使用枚举的地方，它可以工作。有人可以帮帮我吗？

Answer 1

When I'm trying to launch my application it says "Unfortunately, application has stopped." I'm sure it is because of enum because when I comment these two lines where I'm using enum, it works. Can somebody help me, please?

then 可能是因为 BoardState 从未初始化，而您正在尝试访问空对象。添加

BoardState = new int[BOARD_SIZE_VERTICAL][BOARD_SIZE_HORIZONTAL];

在 FieldsGame 中的 for 循环之前。

在 Android Java 编程中使用枚举

Using enum in Android Java programming

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