不确定数量的下落图像...在 SurfaceView 上显示帮助！

Question

我想我已经遇到了编码员的障碍。我正在编写一个游戏，多个图像将从屏幕顶部掉落，你必须在底部抓住它们。图像数量不确定，因此您不知道开始时会有多少张图像。对于我的一生，我无法找出实现这一点的方法。我理解这个逻辑，但是在处理 Android 的类时遇到了麻烦。我尝试创建自己的“开花”对象，但每次我尝试在其中编写与位图有关的任何内容时，它都会崩溃。也许我只是把课程写错了，我不知道。所有这些都是在 SurfaceView 上执行的。有人对如何实现这一目标有任何想法吗？到目前为止，这是我的代码：

    public class BoardView extends SurfaceView implements SurfaceHolder.Callback{
    Context mContext;


    Bitmap box = 
        (BitmapFactory.decodeResource
                (getResources(), R.drawable.box));

    Bitmap blossom = 
        (BitmapFactory.decodeResource
                (getResources(), R.drawable.blossom));

    private BoardThread thread;
    private float box_x = 140;
    private float box_y = 378;
    private float blossom_x = 0;
    private float blossom_y = 0;
    private float boxWidth = box.getWidth();
    private float boxHeight = box.getHeight();
    private float blossomWidth = blossom.getWidth();
    private float blossomHeight = blossom.getHeight();
    private Random generator = new Random();



    boolean mode = false;

    RectF boxRect = new RectF(box_x,box_y, box_x + boxWidth, box_y + boxHeight);
    //ImageView box_view;

    public BoardView(Context context){
        super(context);

        //surfaceHolder provides canvas that we draw on
        getHolder().addCallback(this);

        // controls drawings
        thread = new BoardThread(getHolder(),this);

        //draws the blossom at a random starting point
        blossom_x = generator.nextInt(300);


        //box_view = (ImageView)findViewById(R.id.box_view);
         //box_view.setVisibility(ImageView.VISIBLE);
         //TranslateAnimation anim = new TranslateAnimation(0,0,300,0);
         //anim.setDuration(500);
         //box_view.startAnimation(anim);

        //intercepts touch events
        setFocusable(true);

    }


    @Override

    public void onDraw(Canvas canvas){
        canvas.drawColor(Color.WHITE);  


        //draw box and set start location
        canvas.drawBitmap(box, box_x - (boxWidth/2), 
                box_y - (boxHeight/2), null);

            canvas.drawBitmap(blossom, blossom_x,
                blossom_y = blossom_y+3 , null);

        //collision detection, currently not working after 
            //implementing random draw
            if(blossom_y + blossomHeight == box_y)
        {
            canvas.drawBitmap(blossom, 40,100, null);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event){

        if(event.getAction() == MotionEvent.ACTION_DOWN){
            if(boxRect.contains(event.getX(),event.getY())){
                mode = true;
            }
        }

        if(event.getAction() == MotionEvent.ACTION_MOVE) {
            if(boxRect.contains(event.getX(),event.getY())){
                mode = true;
            }
            if(mode == true){
                box_x = (int)event.getX();
                boxRect.set(box_x,box_y, box_x + boxWidth, box_y + boxHeight);
            }

        }

        if(event.getAction() == MotionEvent.ACTION_UP){
            mode = false;
        }

        invalidate();

        return true;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, 
            int format, int width, int height ){

}

    @Override
    public void surfaceCreated(SurfaceHolder holder){
        thread.startRunning(true);
        thread.start();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder){
        thread.startRunning(false);
        thread.stop();
    }
}

我目前正在使用位图来绘制飘落的花朵。我开始为花对象创建一个类，到目前为止它看起来像这样

    public class Blossom{
    private Bitmap blossom;

    public Blossom()
    {
        Bitmap blossom = 
            (BitmapFactory.decodeResource
                    (getResources(), R.drawable.blossom));
    }
    public void setImage(Bitmap bitmap)
    {
        //sets the image for the blossom;
        Bitmap blossom = bitmap;
    }
}

它一直给我一个错误，说 getResources 对于 Blossom 类是未定义的。当我尝试编写一个名为 setImage 的方法，并在 BoardView 类中设置 Image 时，它​​根本不允许我:( 它看起来像这样

    public class Blossom{
    private Bitmap blossom;

    public void setImage(Bitmap bitmap)
    {
        //sets the image for the blossom;
        Bitmap blossom = bitmap;
    }
}

有人能看出这里出了什么问题吗？

Answer 1

由于您的类扩展了 SurfaceView，因此您应该执行 getContext().getResources()

Edit - 如果您想使用 getResources< /code> 在您的其他类中，那么您还需要传入 Context 。您可能只是传入您的位图，而不是尝试从该数据类中获取它。