安卓广告横幅

Question

我想实现一个旋转横幅。什么控件最适合这样的 UI？

这是它需要做的：

1. 每个视图旋转 1 个图像
2. 仅在滑动（或所谓的 onFling()）时旋转它们
3. 记住当前横幅的索引，并在用户重定向到另一个活动时显示下一个横幅
4. 两个方向旋转都是无限的

因此，本质上，当您进入第一个活动时，会显示第一个索引。当您滑动时，它应该显示下一个或上一个图像，具体取决于滑动是向左还是向右。这应该在无限循环中迭代。

先感谢您

Answer 1

如果有人想要解决方案，这里是代码：

public class CustomBanner extends RelativeLayout {
        //================================================================================
        //==== declaration.
        protected List<Banner> _items = new ArrayList<Banner>();
        protected GestureDetector gestureDetector;
            protected View.OnTouchListener gestureListener;
            protected ImageView _banner = null;
        protected String TAG = "CustomBanner";
        //================================================================================

        //================================================================================
        //==== properties
        /**
         * This property pulls the banners from the state manager. If the banners are not there they will be pulled from the database.
         * */
        protected List<Banner> getBanners()
        {
            // get your banners however way you get them
            return this._items;
        }
        //================================================================================

        //================================================================================
        //==== constructors
        public CustomBanner(Context context, AttributeSet attributes)
        {
            super(context, attributes);
            this.Init(context, attributes);
        }
        //================================================================================

        //================================================================================
        //==== protected methods
        protected void Init(Context context, AttributeSet attributes)
        {
            //---- inflate our layout
            LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            layoutInflater.inflate(R.drawable.controls_custombanner, this);

            this._banner = (ImageView)findViewById(R.id.imgBanner);

                // swipe detection on the image
             this.gestureDetector = new GestureDetector(new MyGestureDetector());
            this.gestureListener = new View.OnTouchListener() {
                    public boolean onTouch(View v, MotionEvent event) {
                        if (gestureDetector.onTouchEvent(event)) {
                            return true;
                        }
                        return false;
                    }
                };
                // leave this, it needs to be here in order to redirect the swipe correctly to touch gesture direction
               this._banner.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // leave blank, click is redirected to gesture 
                    }
                }); 

             this._banner.setOnTouchListener(gestureListener);

                // set banner image
                this.setBanner(this.getCurrentIndexByWndId());
        }


        protected int getCurrentIndexByWndId() {

            // add your logic here
            // you need to access your state to get the last saved id
        }

        /**
         * this function does nothing but set the banner image by the position from the array of banners. 
         * */
        protected void setBanner(int position)
        {
            _banner.setImageResource(this.getBanners().get(position).ResourceId);
        }

        /**
         * this function tests the validity of the index in the banners array and resets it to 0 if its not valid.
         * */
        protected int checkValidIndex(int currentIndex){
            if (currentIndex > this.getBanners().size()-1)
                currentIndex = 0;
            return currentIndex;
        }

        protected void processBannerClick(Banner clickedBanner){
            try
            {
                // here do your logic for the click
            }
            catch (Exception ex)
            {
                Log.e(App.Current.getErrorTag(), ex.getMessage());
            }
        }

        //================================================================================

        //================================================================================
        //==== helper classes
        /**
         * this is a helper class to detect the gesture or swipe. It uses the onFling() to test whether it was a right or left swipe. 
         * It increments the position of and sets the appropriate next image on the banner.
         * */
        protected class MyGestureDetector extends SimpleOnGestureListener {
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                Log.i(TAG, "BANNER: onFling() happened");
                int currentIndex = 0;
                try {
                    currentIndex = FromState.getCurrentAdRotatorPosition();
                    if(isScrollingLeft(e1, e2)) {
                        // left swipe
                        if (currentIndex > 0)
                            currentIndex --;
                        else currentIndex = getBanners().size()-1;
                    }  
                    else {
                        // right swipe
                        if (currentIndex < getBanners().size()-1)
                            currentIndex ++;
                        else currentIndex = 0;
                    }
                } catch (Exception e) {
                    // do nothing
                }
                FromState..setCurrentAdRotatorPosition(currentIndex);
                setBanner(FromState.getCurrentAdRotatorPosition());
                return false;
            }

            @Override
            public boolean onSingleTapUp(MotionEvent ev)
            {
                Log.i(TAG, "BANNER: onSingleTapUp() happened");
                processBannerClick(getBanners().get(FromState.getCurrentAdRotatorPosition()));
                return false;
            }


            /** check if left swipe happened */
            private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){ 
                return e2.getX() > e1.getX(); 
           }
        }
        //================================================================================
    }

Answer 2

http://permalink.gmane.org/gmane.comp.handhelds.android .devel/101327 此代码可以帮助您创建旋转的 onFling 视图。只要去掉无用的功能就差不多完成了。
为了记住当前的横幅，您可能必须将横幅类创建为 Singletone，然后加载它的实例和状态以了解当前显示的横幅。