Java Code Examples for android.view.View#dispatchTouchEvent()

@SuppressLint("ClickableViewAccessibility") // Not needed for ViewPager
@Override
public boolean onTouch(View view, @NonNull MotionEvent event) {
    // ViewPager will steal touch events during settling regardless of
    // requestDisallowInterceptTouchEvent. We will prevent it here.
    if (!isTouchInProgress && event.getActionMasked() == MotionEvent.ACTION_DOWN) {
        isTouchInProgress = true;
        // Now ViewPager is in drag mode, so it should not intercept DOWN event
        view.dispatchTouchEvent(event);
        isTouchInProgress = false;
        return true;
    }

    // User can touch outside of child view, so we will not have a chance to settle
    // ViewPager. If so, this listener should be called and we will be able to settle
    // ViewPager manually.
    settleViewPagerIfFinished((ViewPager) view, event);

    return true; // We should skip view pager touches to prevent some subtle bugs
}
 

public boolean onTouchEvent(MotionEvent event) {
	if (!isInterceptTouches)
		return super.onTouchEvent(event);
	int count = getChildCount();
	if (count < 0)
		return isInterceptTouches;
	
	for (int i = 0; i < count; ++i) {
		View childView = getChildAt(i);
		float oldX = event.getX();
		float oldY = event.getY();
		float x = event.getX() - childView.getLeft();
		float y = event.getY() - childView.getTop();
		if (((y >= 0.0F) && (x >= 0.0F))
				|| ((MotionEvent.ACTION_MASK & event.getAction()) != MotionEvent.ACTION_DOWN)){
			//L.i("liweiping", "new touch --> x = " + x +", y = " + y);
			event.setLocation(x, y);
		}else{
			//L.i("liweiping", "old touch --> oldX = " + oldX +", oldY = " + oldY);
			event.setLocation(oldX, oldY);
		}
		childView.dispatchTouchEvent(event);
	}
	return isInterceptTouches;
}
 

private void checkHitArea(View recyclerViewHeader, MotionEvent motionEvent, int pointerIndex) {
    final float x = MotionEventCompat.getX(motionEvent, pointerIndex);
    final float y = MotionEventCompat.getY(motionEvent, pointerIndex);

    Rect rect = new Rect();
    recyclerViewHeader.getHitRect(rect);
    if((rect.contains((int)x,(int)y))){
        recyclerViewHeader.dispatchTouchEvent(motionEvent);

        shouldIntercept = true;

        return;
    }

    shouldIntercept = false;
}
 

@SuppressLint("NewApi")
@Override
public boolean dispatchTouchEvent(MotionEvent mv) {
    //We need to ignore this even if it's processed by the action
    //bar (if one exists)
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        ActionBar bar = getActionBar();
        if (bar != null) {
            View customView = bar.getCustomView();
            if (customView != null && customView.dispatchTouchEvent(mv)) {
                return true;
            }
        }
    }

    boolean handled = mGestureDetector.onTouchEvent(mv);
    return handled || super.dispatchTouchEvent(mv);
}
 

/**
 * Duplicate touch events to child views.
 * We want to dispatch a down motion event and the move events to
 * child views, but calling dispatchTouchEvent() causes StackOverflowError.
 * Therefore we do it manually.
 *
 * @param ev            motion event to be passed to children
 * @param pendingEvents pending events like ACTION_DOWN. This will be passed to the children before ev
 */
private void duplicateTouchEventForChildren(MotionEvent ev, MotionEvent... pendingEvents) {
    if (ev == null) {
        return;
    }
    for (int i = getChildCount() - 1; 0 <= i; i--) {
        View childView = getChildAt(i);
        if (childView != null) {
            Rect childRect = new Rect();
            childView.getHitRect(childRect);
            MotionEvent event = MotionEvent.obtainNoHistory(ev);
            if (!childRect.contains((int) event.getX(), (int) event.getY())) {
                continue;
            }
            float offsetX = -childView.getLeft();
            float offsetY = -childView.getTop();
            boolean consumed = false;
            if (pendingEvents != null) {
                for (MotionEvent pe : pendingEvents) {
                    if (pe != null) {
                        MotionEvent peAdjusted = MotionEvent.obtainNoHistory(pe);
                        peAdjusted.offsetLocation(offsetX, offsetY);
                        consumed |= childView.dispatchTouchEvent(peAdjusted);
                    }
                }
            }
            event.offsetLocation(offsetX, offsetY);
            consumed |= childView.dispatchTouchEvent(event);
            if (consumed) {
                break;
            }
        }
    }
}
 

@Override
public boolean performAccessibilityAction(int action, Bundle arguments) {
    if (action == R.id.acc_action_open_photo) {
        View parent = (View) getParent();
        parent.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, getLeft(), getTop() + getHeight() - 1, 0));
        parent.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, getLeft(), getTop() + getHeight() - 1, 0));
    }
    return super.performAccessibilityAction(action, arguments);
}
 

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    for (int i = 0; i < getChildCount(); i++) {
        View child = getChildAt(i);
        try {
            child.dispatchTouchEvent(ev);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return true;
}
 

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    for (int i = 0; i < getChildCount(); i++) {
        View child = getChildAt(i);
        try {
            child.dispatchTouchEvent(ev);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return true;
}
 

@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
    final int actionMasked = motionEvent.getActionMasked();
    if (actionMasked == MotionEvent.ACTION_DOWN) {
        if (view instanceof ViewGroup) {
            mInitialTouchTarget = findNearestChild((ViewGroup) view,
                    (int) motionEvent.getX(), (int) motionEvent.getY());
        } else {
            mInitialTouchTarget = null;
        }
    }

    final View child = mInitialTouchTarget;
    if (child == null) {
        return false;
    }

    final float offsetX = view.getScrollX() - child.getLeft();
    final float offsetY = view.getScrollY() - child.getTop();
    motionEvent.offsetLocation(offsetX, offsetY);
    final boolean handled = child.dispatchTouchEvent(motionEvent);
    motionEvent.offsetLocation(-offsetX, -offsetY);

    if (actionMasked == MotionEvent.ACTION_UP
            || actionMasked == MotionEvent.ACTION_CANCEL) {
        mInitialTouchTarget = null;
    }

    return handled;
}
 

@Override
public boolean propagateEvent(MotionEvent e) {
    if (e == null) return false;

    View view = getActiveLayout().getViewForInteraction();
    if (view == null) return false;

    e.offsetLocation(-view.getLeft(), -view.getTop());
    return view.dispatchTouchEvent(e);
}
 

@Override
public boolean onTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
    if (!isInBounds(ev, child)) return false;
    ev.offsetLocation(-child.getX(), -child.getY());
    child.dispatchTouchEvent(ev);
    return true;
}
 

private void fireTouchEvent(View view, float xPosition, float yPosition, int actionDown) {
  MotionEvent motionEvent = MotionEvent.obtain(
      SystemClock.uptimeMillis(),
      SystemClock.uptimeMillis(),
      actionDown,
      xPosition,
      yPosition,
      0
  );
  view.dispatchTouchEvent(motionEvent);
}
 

@Override
public boolean onTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
    if (!mShouldIntercept) return false;
    ev.offsetLocation(-child.getX(), -child.getY());
    child.dispatchTouchEvent(ev);
    return true;
}
 

@Override
public boolean propagateEvent(MotionEvent e) {
    if (e == null) return false;

    View view = getActiveLayout().getViewForInteraction();
    if (view == null) return false;

    e.offsetLocation(-view.getLeft(), -view.getTop());
    return view.dispatchTouchEvent(e);
}
 

public boolean dispatchTouchEventToView(View view, MotionEvent ev) {
    try {
        return view.dispatchTouchEvent(ev);
    } catch (Exception e) {
        // 部分机型会抛异常
        e.printStackTrace();
    }
    return false;
}
 

@Override
public boolean dispatchTouchEvent(MotionEvent me){

   boolean wasInTitle = false;
   switch(me.getActionMasked()){
   case MotionEvent.ACTION_DOWN:
      touchInHeader = (me.getY() <= visibleHeaderHeight());
      break;

   case MotionEvent.ACTION_UP:
   case MotionEvent.ACTION_CANCEL:
      wasInTitle = touchInHeader;
      touchInHeader = false;
      break;
   }
   if (touchInHeader || wasInTitle) {
      View title = getChildAt(0);
      if(title!=null) {
         // this touch belongs to title bar, dispatch it here
         me.offsetLocation(0, getScrollY());
         return title.dispatchTouchEvent(me);
      }
   }
   // this is our touch, offset and process
   me.offsetLocation(0, -headerHeight);
   return super.dispatchTouchEvent(me);
}
 

private boolean cancelMotionEvent(MotionEvent event, View mDispatchView){
  	MotionEvent cancelEvent = MotionEvent.obtain(event);
      cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
      
      boolean result;
      if(mDispatchView != null)
      	result = mDispatchView.dispatchTouchEvent(cancelEvent) || super.dispatchTouchEvent(cancelEvent);
      else
      	result = super.dispatchTouchEvent(cancelEvent);
      
cancelEvent.recycle();

return result;
  }
 

/**
 * Duplicate touch events to child views.
 * We want to dispatch a down motion event and the move events to
 * child views, but calling dispatchTouchEvent() causes StackOverflowError.
 * Therefore we do it manually.
 *
 * @param ev            motion event to be passed to children
 * @param pendingEvents pending events like ACTION_DOWN. This will be passed to the children before ev
 */
private void duplicateTouchEventForChildren(MotionEvent ev, MotionEvent... pendingEvents) {
    if (ev == null) {
        return;
    }
    for (int i = getChildCount() - 1; 0 <= i; i--) {
        View childView = getChildAt(i);
        if (childView != null) {
            Rect childRect = new Rect();
            childView.getHitRect(childRect);
            MotionEvent event = MotionEvent.obtainNoHistory(ev);
            if (!childRect.contains((int) event.getX(), (int) event.getY())) {
                continue;
            }
            float offsetX = -childView.getLeft();
            float offsetY = -childView.getTop();
            boolean consumed = false;
            if (pendingEvents != null) {
                for (MotionEvent pe : pendingEvents) {
                    if (pe != null) {
                        MotionEvent peAdjusted = MotionEvent.obtainNoHistory(pe);
                        peAdjusted.offsetLocation(offsetX, offsetY);
                        consumed |= childView.dispatchTouchEvent(peAdjusted);
                    }
                }
            }
            event.offsetLocation(offsetX, offsetY);
            consumed |= childView.dispatchTouchEvent(event);
            if (consumed) {
                break;
            }
        }
    }
}
 

/**
 * @hide The ZoomButtonsController implements the OnTouchListener, but this
 *       does not need to be shown in its public API.
 */
public boolean onTouch(View v, MotionEvent event) {
    int action = event.getAction();

    if (event.getPointerCount() > 1) {
        // ZoomButtonsController doesn't handle mutitouch. Give up control.
        return false;
    }

    if (mReleaseTouchListenerOnUp) {
        // The controls were dismissed but we need to throw away all events until the up
        if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
            mOwnerView.setOnTouchListener(null);
            setTouchTargetView(null);
            mReleaseTouchListenerOnUp = false;
        }

        // Eat this event
        return true;
    }

    dismissControlsDelayed(ZOOM_CONTROLS_TIMEOUT);

    View targetView = mTouchTargetView;

    switch (action) {
        case MotionEvent.ACTION_DOWN:
            targetView = findViewForTouch((int) event.getRawX(), (int) event.getRawY());
            setTouchTargetView(targetView);
            break;

        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_CANCEL:
            setTouchTargetView(null);
            break;
    }

    if (targetView != null) {
        // The upperleft corner of the target view in raw coordinates
        int targetViewRawX = mContainerRawLocation[0] + mTouchTargetWindowLocation[0];
        int targetViewRawY = mContainerRawLocation[1] + mTouchTargetWindowLocation[1];

        MotionEvent containerEvent = MotionEvent.obtain(event);
        // Convert the motion event into the target view's coordinates (from
        // owner view's coordinates)
        containerEvent.offsetLocation(mOwnerViewRawLocation[0] - targetViewRawX,
                mOwnerViewRawLocation[1] - targetViewRawY);
        /* Disallow negative coordinates (which can occur due to
         * ZOOM_CONTROLS_TOUCH_PADDING) */
        // These are floats because we need to potentially offset away this exact amount
        float containerX = containerEvent.getX();
        float containerY = containerEvent.getY();
        if (containerX < 0 && containerX > -ZOOM_CONTROLS_TOUCH_PADDING) {
            containerEvent.offsetLocation(-containerX, 0);
        }
        if (containerY < 0 && containerY > -ZOOM_CONTROLS_TOUCH_PADDING) {
            containerEvent.offsetLocation(0, -containerY);
        }
        boolean retValue = targetView.dispatchTouchEvent(containerEvent);
        containerEvent.recycle();
        return retValue;

    } else {
        return false;
    }
}
 

public static void emulateClickEvent(View view, int x, int y) {
  MotionEvent down = obtain(uptimeMillis(), uptimeMillis(), ACTION_DOWN, x, y, 0);
  MotionEvent up = obtain(uptimeMillis() + 10, uptimeMillis() + 10, ACTION_UP, x, y, 0);
  view.dispatchTouchEvent(down);
  view.dispatchTouchEvent(up);
}