Android:Webview 画廊

Question

我正在尝试使用 Gallery 小部件构建一组水平滚动的 Web View 。问题是我无法滑动 View ，这当然适用于图像库。按照食谱代码，在 Activity 的 onCreate() I 中:

g = (Gallery) findViewById(R.id.chapter_browser);
g.setAdapter(new WebViewAdapter(this));

然后适配器创建 webviews 并为请求的索引返回它们:

   public class WebViewAdapter extends BaseAdapter {
        int mGalleryItemBackground;
        private Context mContext;

        private String[] pages = {
                "test1.html",
                "test2.html",
                "test3.html",
                "test4.html"
        };

        public WebViewAdapter(Context c) {
            mContext = c;
        }

        public int getCount() {
            return pages.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            WebView i = new WebView(mContext);

            i.loadUrl("file:///android_asset/" + pages[position]);
            i.setBackgroundResource(mGalleryItemBackground);
            i.setWebViewClient(new WebViewClient());
            i.setLayoutParams(new Gallery.LayoutParams(100,100));
            i.setInitialScale(100);
            i.setFocusable(false);
            i.setClickable(false);

            return i;
        }
    }

问题似乎是 WebView 坚持使用触摸事件，尽管将其 clickable 属性设置为关闭。我尝试为 View 创建一个 OnTouchEventListener，然后将事件分派(dispatch)到画廊，但这似乎会使程序崩溃。

感谢任何线索。

Answer 1

我在使用 WebView 库时遇到了同样的问题，并最终执行了以下操作:

public class MyGallery extends Gallery
{

    private final int slop;
    private float initialX;
    private float initialY;

    public MyGallery(Context context, AttributeSet attrs)
        {
        super(context, attrs);

        slop = ViewConfiguration.get(context).getScaledTouchSlop();
        }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
        {
        return false;
        }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev)
        {
        switch (ev.getAction())
            {
            case MotionEvent.ACTION_DOWN:
                /*
                 * Kludge: Both the gallery and the child need to see the
                 * gesture, until we know enough about it to decide who gets it.
                 */
                onTouchEvent(ev);

                initialX = ev.getX();
                initialY = ev.getY();

                return false;

            case MotionEvent.ACTION_MOVE:
                float distX = Math.abs(ev.getX() - initialX);
                float distY = Math.abs(ev.getY() - initialY);

                if (distY > distX && distY > slop)
                    /* Vertical scroll, child takes the gesture. */
                    return false;

                /*
                 * If a horizontal scroll, we take the gesture, otherwise keep
                 * peeking.
                 */
                return distX > slop;

            default:
                return false;
            }
        }

}

这让我可以垂直滚动网页内容并点击链接，而水平滚动则驱动画廊。