Question

我想从我的游戏扩展活动传递一些值到屏幕扩展SurfaceView使用getter，但我总是0，我不知道发生了什么。

这是我的Game类代码：

public class Game extends Activity{

Screen screen;
Map map;
int mouseEvent;
private int mouseX;
private int mouseY;
private Bundle extra;
private int tileRows;
private int tileColumns;
private int minBlocks;
private int maxBlocks;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    getWindow().setFlags(LayoutParams.FLAG_FULLSCREEN, LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    extra = getIntent().getExtras();
    tileRows = extra.getInt("numRow");
    tileColumns = extra.getInt("numColumn");
    minBlocks = extra.getInt("numMinBlock");
    maxBlocks = extra.getInt("numMaxBlock");
    setContentView(R.layout.game);
}

public boolean onTouchEvent(MotionEvent event){
    mouseEvent = event.getAction();
    mouseX = (int) event.getX();
    mouseY = (int) event.getY();
    return super.onTouchEvent(event);
}

public int getMouseX() {
    return mouseX;
}

public int getMouseY() {
    return mouseY;
}

public int getTileRows() {
    return tileRows;
}

public int getTileColumns() {
    return tileColumns;
}

public int getMinBlocks() {
    return minBlocks;
}

public int getMaxBlocks() {
    return maxBlocks;
}

public void setMouseX(int mouseX) {
    this.mouseX = mouseX;
}

public void setMouseY(int mouseY) {
    this.mouseY = mouseY;
}

}

这是我的Screen类代码：

public class Screen extends SurfaceView implements Callback

{

private Map map;
private SurfaceHolder holder;
private GameThread gamethread;
private Penguin penguin;
private boolean isSurfaceCreated;
private Bitmap tiles, character;
private int tileRows, tileColumns, minBlocks, maxBlocks;

public Screen(Context context, AttributeSet attb) {
    super(context, attb);
    tiles = BitmapFactory.decodeResource(getResources(), R.drawable.tile_sprites);
    character = BitmapFactory.decodeResource(getResources(), R.drawable.penguin_sprite);
    this.getHolder().addCallback(this);
    this.tileRows = new Game().getTileRows();
    this.tileColumns = new Game().getTileColumns();
    this.minBlocks = new Game().getMinBlocks();
    this.maxBlocks = new Game().getMaxBlocks();
}

}

我们将非常感谢您的帮助：）

Answer 1

Activity类不应该由您的代码实例化;当您使用Intent时，会根据需要创建/重新使用它们。当您创建new Game()时，没有与之关联的意图，因此其构造函数中的getExtras调用找不到您正在寻找的整数 - 因此所有内容都会显示为0。

如果您知道Screen个对象仅由Game活动使用，您可以将context转换为Game，然后直接调用getter。

将值从在Activity中扩展的类传递到在SurfaceView中扩展的类

1 个答案: