Question

我正在使用ViewPager Extension让我的应用具有标签功能。我的应用程序中有两个选项卡，我们在这里命名为tabA和tabB。 tabA包含webview组件，tabB包含listview。

现在，我遇到了一个问题：一旦我尝试从tabA滚动到tabB，tabA中的页面在更改为tabB时（或之前）更改。换句话说，当我尝试从tabA滚动到tabB时，我的要求是不要触发tabA中的click事件。

有没有人对此问题有任何想法或经验，非常感谢！

我曾尝试使用GestureDetector检测手势，但这对我不起作用。

final GestureDetector dector = new GestureDetector(new OnGestureListener(){...}
webView.setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent event) {

        return dector.onTouchEvent(event);
    }
});

Answer 1

你能做的就是那个

检测滑动并设置标志，然后

public interface TouchDelegate {
   public void gestureHandler(String msg, float downX, float downY);

   public boolean notASwipe(View v, MotionEvent event);
}

public class SwipeDetector implements View.OnTouchListener {

   private TouchDelegate mView;
   static final int MIN_DISTANCE = 50;
   private float downX, downY, upX, upY;
   public SwipeDetector(TouchDelegate view) {
      this.mView = view;
   }

   public void onRightToLeftSwipe() {
      mView.gestureHandler("R2L", downX, downY);
   }

   public void onLeftToRightSwipe() {
      mView.gestureHandler("L2R", downX, downY);
   }

   public void onTopToBottomSwipe() {
      mView.gestureHandler("T2B", downX, downY);
   }

   public void onBottomToTopSwipe() {
      mView.gestureHandler("B2T", downX, downY);
   }

   public boolean onTouch(View v, MotionEvent event) {
   switch (event.getAction()) {
   case MotionEvent.ACTION_DOWN: {
       downX = event.getX();
       downY = event.getY();
       return true;
   }
   case MotionEvent.ACTION_UP: {
       upX = event.getX();
       upY = event.getY();

       float deltaX = downX - upX;
       float deltaY = downY - upY;

       // swipe horizontal?
       if (Math.abs(deltaX) > MIN_DISTANCE) {
           // left or right
           if (deltaX < 0) {
               this.onLeftToRightSwipe();
               return true;
           }
           if (deltaX > 0) {
               this.onRightToLeftSwipe();
               return true;
           }
       } else {
           // swipe vertical?
           if (Math.abs(deltaY) > MIN_DISTANCE) {
               // top or down
               if (deltaY < 0) {
                   this.onTopToBottomSwipe();
                   return true;
               }
               if (deltaY > 0) {
                   this.onBottomToTopSwipe();
                   return true;
               }
           } else {
               Log.d(getClass().getSimpleName(),
                       "SwipeDetector: onTouch: Swipe was only x: " + Math.abs(deltaX)
                            + " long, need at least " + MIN_DISTANCE);
            Log.d(getClass().getSimpleName(),
                    "SwipeDetector: onTouch: Swipe was only y: "
                            + Math.abs(deltaY)
                            + " long, need at least " + MIN_DISTANCE);
            return mView.notASwipe(v, event); // We don't consume the
                                                // event
        }
    }
    return true;
}
}
return false;
}
}

覆盖shouldOverrideUrlLoading以禁用webview上的所有链接。以下是禁用webview上所有链接的代码：

public class MyWebViewClient extends WebViewClient {
 public boolean shuldOverrideKeyEvent (WebView view, KeyEvent event) {
    if(swipe)              
       return true;
     return false;
 }
 public boolean shouldOverrideUrlLoading (WebView view, String url) {
   if (!swipe) {
        view.loadUrl(url);
   }
   return true;
 }
}

Answer 2

对WebView进行子类化，然后覆盖onTouchEvent方法，如下所示：

@Override
public boolean onTouchEvent(MotionEvent event)
{
    // If this web view gets sent a 'CANCEL' event, it means the 
    // parent view has intercepted the event (for scrolling / swiping),
    // so we want to catch it, otherwise it propagates into the HTML 
    // and triggers the click
    int action = MotionEventCompat.getActionMasked(event);
    if(action == MotionEvent.ACTION_CANCEL)
    {
        return true;
    }
    return super.onTouchEvent(event);
}

当发生正确的滑动时，封闭的ViewPager已经拦截了触摸事件，将ACTION_CANCEL事件发送到WebView。通过在ACTION_CANCEL方法中捕获onTouchEvent事件，可以防止事件进入WebView中的HTML。

Answer 3

我有同样的问题。我已经搜索了几个需要在java编码的想法，但我认为这不是好的，简单的，干净的方式。然后我找到了一个非常简单和干净的解决方案。您只需要使用此行android:descendantFocusability="blocksDescendants"在webView的XML父级中使用此行代码。多数民众赞成

滚动时阻止选项卡中webview中的单击事件

3 个答案: