Question

我正在为大学做一个小项目，并想知道是否有人可以告诉我如何做一个刮刮卡应用程序。这个应用程序应该有一个图像覆盖另一个顶部的那个应该允许用户根据它们在图像上摩擦的位置来移除图像，因此移除的图像的一部分显示下面的图像。非常像刮刮卡。任何帮助都会很棒！

这是我目前正在使用的代码。

            public class workinggraphics extends Activity 
 {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.main);
    setContentView(new Panel(this));

    LinearLayout l1 = (LinearLayout) findViewById(R.id.LAYOUTTEST1);
    Panel p1 = new Panel(null);
}

    class Panel extends View{

        private Bitmap  mBitmap;
        private Canvas  mCanvas;
        private Path    mPath;
        private Paint   mPaint;
    //  private Paint nPaint;
        Bitmap bitmap;
        Canvas pcanvas ;
        int x = 0;
        int y =0;
        int r =0;
        public Panel(Context context) {
            super(context);

            Log.v("Panel", "STROKE");

            setFocusable(true);
            setBackgroundColor(Color.TRANSPARENT);
        /*  
            WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
            //WallpaperDrawable wallpaperDrawable=wallpaperManager.getDrawable();
            try {
                wallpaperManager.setBitmap(bmp);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }*/
            //setBackgroundDrawable(bmp);
            // setting paint 
        /*  nPaint = new Paint();
            nPaint.setStyle(Paint.Style.FILL);*/

            mPaint = new Paint();
            mPaint.setAlpha(0);
            mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
            mPaint.setStrokeCap(Paint.Cap.BUTT);
            mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));//.Mode.DST_IN));
            mPaint.setAntiAlias(false);

            // getting image from resources
            Resources r = this.getContext().getResources();

            Bitmap bm = BitmapFactory.decodeResource(getResources(),  R.drawable.mainscreen_background);
            Bitmap bm1 = BitmapFactory.decodeResource(getResources(),R.drawable.foreground_image);
            // converting image bitmap into mutable bitmap
            bitmap =  bm.createBitmap(bm.getWidth(), bm.getHeight(), Config.ARGB_8888);
            //bitmap = bm1.createBitmap(bm1.getWidth(),bm1.getHeight(),Config.ARGB_8888);
            pcanvas = new Canvas();
            pcanvas.setBitmap(bitmap);                   // drawXY will result on that Bitmap
            pcanvas.drawBitmap(bm, 0, 0, null);
            pcanvas.drawBitmap(bm1,0,0,null);


        }

        @Override
        protected void onDraw(Canvas canvas) {


            Rect cBK = new Rect();
            //canvas.set
            cBK.set(0,0,canvas.getWidth(),canvas.getHeight());

            //pcanvas.drawRect(cBK, nPaint);
            // draw a circle that is  erasing bitmap            
            pcanvas.drawCircle(x, y, r, mPaint);
            //pcanvas.drawLine(x, y, 0, 0, mPaint);

            canvas.drawBitmap(bitmap, 0, 0,null);

            super.onDraw(canvas);

        }



        @Override
        public boolean onTouchEvent(MotionEvent event) {

            // set paramete to draw circle on touch event
            x = (int) event.getX();
            y = (int) event.getY();

            r =20;
            // Atlast invalidate canvas
            invalidate();
            return true;
        }
    }
}

现在你可以看到上面有很多关于我们尝试过的事情的评论。理想情况下，我希望能够创建Panel类的实例，将workinggraphics类contextview设置为XML LinearLayout（或者我将不知道使用的是SurfaceView w / e），然后只需设置一个背景当画布擦除我们设置的位图图像时，将在XML中定义的LinearLayout上显示图像。

无论如何，任何建议都会被提前感谢！

Answer 1

我创建了一个库调用WScrarchView，您可以在布局xml中实现几行的临时视图。希望这可以帮助那些仍在寻找解决方案的人https://github.com/winsontan520/Android-WScratchView

Android Scratch卡应用

1 个答案: