Question

我有一个Activity，它实现了一个Gesture Detector来捕获用户输入以便导航到其他屏幕。这工作正常 - 但是 - 我最近更新了一个派生自BaseActivity的类来添加onClick函数，现在click事件似乎阻止onFling被击中。 onClick与我在屏幕上的TextView区域（在LinearLayout中）相关联。 resultsClick方法使用XML布局中的onClick属性连接到TextView。

我已经尝试在没有运气的情况下更改onSingleTapUp和onDown中的返回值。我也尝试过将log语句添加到下面的所有函数中。当我在TextView区域中投掷时，它们都不会触发，但它们会在屏幕的其他区域中触发。

也许我使用了错误的搜索字词，但我似乎无法找到解决此问题的示例 - 但我确信此问题之前已经解决过了。

public class DerivedActivity extends BaseActivity
{
   ...
   /**
    * resultsClick - The user clicked on the Results area
    * @param v
    */
   public void resultsClick(View v)
   {
      try
      {
         Log.i(this.toString(), "resultsClick");
         startActivity(new Intent(this, Results_TabHost.class ));
      }
      catch (Exception e)
      {
         Log.e(this.toString(), "Exception" + e.toString());
      }

   }// end resultsClick
   ...
}

这是实现GestureListener代码的基类

public class BaseActivity extends    ActivityGroup 
                          implements OnGestureListener
{
   ...
   private static final int SWIPE_MIN_DISTANCE = 120;
   private static final int SWIPE_MAX_OFF_PATH = 250;
   private static final int SWIPE_THRESHOLD_VELOCITY = 200;

   public boolean onFling(MotionEvent e1, 
                          MotionEvent e2, 
                          float velocityX, 
                          float velocityY)
   {
      try
      {
         Log.i(this.toString(), "onFling");

         // jump right out if not a swipe/fling
         if (Math.abs( e1.getY() - e2.getY() ) > SWIPE_MAX_OFF_PATH)
         {
            return false;
         }

         // right to left swipe
         if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && 
             Math.abs(velocityX)   > SWIPE_THRESHOLD_VELOCITY )
         {
            Log.i(this.toString(), "fling left");
            rightArrowClick(null);

         }
         else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && 
                  Math.abs(velocityX)   > SWIPE_THRESHOLD_VELOCITY )
         {
            Log.i(this.toString(), "fling right");
            leftArrowClick(null);
         }
      }
      catch (Exception e)
      {
         Log.e(this.toString(), "Exception" + e.toString());
      }

      return true;

   }// end onFling

   // These next methods we are required to have - even if unused - 
   // in order for the Gesture Handling to work

   @Override
   public boolean onTouchEvent(MotionEvent motionEvent)
   {
      return this.gestureDetector.onTouchEvent(motionEvent);
   }

   @Override
   public void onLongPress(MotionEvent e)
   {
      // Intentionally not handling - must be overridden by listener class
   }

   @Override
   public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
   {
      // Intentionally not handling - must be overridden by listener class
      // Intentionally returning true - per code examples
      return true;
   }

   @Override
   public void onShowPress(MotionEvent e)
   {
      // Intentionally not handling - must be overridden by listener class
   }

   @Override
   public boolean onSingleTapUp(MotionEvent e)
   {
      // Intentionally not handling - must be overridden by listener class
      // Intentionally returning true - per code examples
      return true;
   }

   @Override
   public boolean onDown(MotionEvent e)
   {
      // Intentionally not handling - must be overridden by listener class
      // Intentionally returning true - per code examples
      return true;
   }
...
}

Answer 1

onTouchEvent的实现不正确。您只需返回gestureDector结果的值。

如果您的手势检测器没有检测到任何手势，则告诉来电者“我这里没有任何事情可做”，触摸事件将永远不会发送给活动的孩子。

如果您的手势检测器未处理此事件，则需要致电super.onTouchEvent()。

@Override
public boolean onTouchEvent(MotionEvent motionEvent)
{
  if(this.gestureDetector.onTouchEvent(motionEvent))
  {
      return true;
  }
  //no gesture detected, let Activity handle touch event
  return super.onTouchEvent(motionEvent);
}

Answer 2

请注意这个功能：

@Override
   public boolean onDown(MotionEvent e)
   {
      // Intentionally not handling - must be overridden by listener class
      // Intentionally returning true - per code examples
      return true;
   }

请将返回值更改为false。

Answer 3

当你的代码没有做任何事情时，你可以返回false ...它将让动作事件系统管理它自己的所有内容。当你想要将事件发送到其他孩子视图时，返回true。

Answer 4

imageView.setOnTouchListener(new View.OnTouchListener() {
                                        @Override
                                        public boolean onTouch(View v, MotionEvent event) {
                                            if (mDetector.onTouchEvent(event)) {
                                                return true;
                                            }

                                            return HomeScreen.super.onTouchEvent(event);
                                        }
                                    });

public class JGestureDetector extends GestureDetector.SimpleOnGestureListener {
        private static final int SWIPE_MIN_DISTANCE = 120;
        private static final int SWIPE_MAX_OFF_PATH = 250;
        private static final int SWIPE_THRESHOLD_VELOCITY = 200;

        private SwipeHandler handler;

        public SwipeHandler getHandler() {
            return handler;
        }

        public void setHandler(SwipeHandler handler) {
            this.handler = handler;
        }

        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;

            // left
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

                if (handler != null) {
                    handler.onLeft();

                    return true;
                }

                // right
            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

                if (handler != null) {
                    handler.onRight();

                    return true;
                }
            }

            return super.onFling(e1, e2, velocityX, velocityY);
        }

        public static abstract class SwipeHandler {
            public void onLeft() {
            }

            public void onRight() {
            }
        }
    }

Android onClick阻止onFling

4 个答案: