Java Code Examples for android.widget.ListView#getHeight()

public boolean canTargetScrollVertically(int direction) {
    ListView target = this.mTarget;
    int itemCount = target.getCount();
    if (itemCount == 0) {
        return false;
    }
    int childCount = target.getChildCount();
    int firstPosition = target.getFirstVisiblePosition();
    int lastPosition = firstPosition + childCount;
    if (direction > 0) {
        if (lastPosition >= itemCount && target.getChildAt(childCount - 1).getBottom() <= target.getHeight()) {
            return false;
        }
    } else if (direction >= 0) {
        return false;
    } else {
        if (firstPosition <= 0 && target.getChildAt(0).getTop() >= 0) {
            return false;
        }
    }
    return true;
}
 

/**
 * 判断 ListView 是否已经滚动到底部
 *
 * @param listView 需要被判断的 ListView
 * @return
 */
public static boolean isListViewAlreadyAtBottom(ListView listView) {
    if (listView.getAdapter() == null || listView.getHeight() == 0) {
        return false;
    }

    if (listView.getLastVisiblePosition() == listView.getAdapter().getCount() - 1) {
        View lastItemView = listView.getChildAt(listView.getChildCount() - 1);
        if (lastItemView != null && lastItemView.getBottom() == listView.getHeight()) {
            return true;
        }
    }
    return false;
}
 

/**
 * 判断 ListView 是否已经滚动到底部
 *
 * @param listView 需要被判断的 ListView
 * @return
 */
public static boolean isListViewAlreadyAtBottom(ListView listView) {
    if (listView.getAdapter() == null || listView.getHeight() == 0) {
        return false;
    }

    if (listView.getLastVisiblePosition() == listView.getAdapter().getCount() - 1) {
        View lastItemView = listView.getChildAt(listView.getChildCount() - 1);
        if (lastItemView != null && lastItemView.getBottom() == listView.getHeight()) {
            return true;
        }
    }
    return false;
}
 

private boolean hasHitBottom() {
    if (mMainView instanceof ScrollView) {
        ScrollView scrollView = (ScrollView) mMainView;
        View view = scrollView.getChildAt(scrollView.getChildCount() - 1);
        int diff = (view.getBottom() - (scrollView.getHeight() + scrollView.getScrollY()));// Calculate the scrolldiff
        return diff == 0;
    } else if (mMainView instanceof ListView) {
        ListView listView = (ListView) mMainView;
        if (listView.getAdapter() != null) {
            if (listView.getAdapter().getCount() > 0) {
                return listView.getLastVisiblePosition() == listView.getAdapter().getCount() - 1 &&
                        listView.getChildAt(listView.getChildCount() - 1).getBottom() <= listView.getHeight();
            }
        }
    } else if (mMainView instanceof RecyclerView) {
        RecyclerView recyclerView = (RecyclerView) mMainView;
        if (recyclerView.getAdapter() != null && recyclerView.getLayoutManager() != null) {
            RecyclerView.Adapter adapter = recyclerView.getAdapter();
            if (adapter.getItemCount() > 0) {
                RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
                if (layoutManager instanceof LinearLayoutManager) {
                    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
                    return linearLayoutManager.findLastCompletelyVisibleItemPosition() == adapter.getItemCount() - 1;
                } else if (layoutManager instanceof StaggeredGridLayoutManager) {
                    StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
                    int[] checks = staggeredGridLayoutManager.findLastCompletelyVisibleItemPositions(null);
                    for (int check : checks) {
                        if (check == adapter.getItemCount() - 1)
                            return true;
                    }
                }
            }
        }
    }
    return false;
}
 

boolean handlePostForDoubleClick(final View view) {
	final PostViewHolder holder = ListViewUtils.getViewHolder(view, PostViewHolder.class);
	if (holder != null) {
		if (holder.comment.getVisibility() != View.VISIBLE || holder.comment.isSelectionEnabled()) {
			return false;
		}
		long t = System.currentTimeMillis();
		long timeout = holder.comment.getPreferredDoubleTapTimeout();
		if (t - holder.lastCommentClick > timeout) {
			holder.lastCommentClick = t;
		} else {
			final ListView listView = (ListView) view.getParent();
			final int position = listView.getPositionForView(view);
			holder.comment.startSelection();
			int padding = holder.comment.getSelectionPadding();
			if (padding > 0) {
				final int listHeight = listView.getHeight() - listView.getPaddingTop() -
						listView.getPaddingBottom();
				listView.post(() -> {
					int end = holder.comment.getSelectionEnd();
					if (end >= 0) {
						Layout layout = holder.comment.getLayout();
						int line = layout.getLineForOffset(end);
						int count = layout.getLineCount();
						if (count - line <= 4) {
							listView.setSelectionFromTop(position, listHeight - view.getHeight());
						}
					}
				});
			}
		}
		return true;
	} else {
		return false;
	}
}
 

public void apply(final ListView listView) {
	if (listView.getHeight() == 0) {
		listView.post(() -> listView.setSelectionFromTop(position, y));
	} else {
		listView.setSelectionFromTop(position, y);
	}
}
 

@Override
public boolean canTargetScrollVertically(int direction) {
    final ListView target = mTarget;
    final int itemCount = target.getCount();
    if (itemCount == 0) {
        return false;
    }

    final int childCount = target.getChildCount();
    final int firstPosition = target.getFirstVisiblePosition();
    final int lastPosition = firstPosition + childCount;

    if (direction > 0) {
        // Are we already showing the entire last item?
        if (lastPosition >= itemCount) {
            final View lastView = target.getChildAt(childCount - 1);
            if (lastView.getBottom() <= target.getHeight()) {
                return false;
            }
        }
    } else if (direction < 0) {
        // Are we already showing the entire first item?
        if (firstPosition <= 0) {
            final View firstView = target.getChildAt(0);
            if (firstView.getTop() >= 0) {
                return false;
            }
        }
    } else {
        // The behavior for direction 0 is undefined and we can return
        // whatever we want.
        return false;
    }

    return true;
}
 

@Override
public boolean canTargetScrollVertically(int direction) {
    final ListView target = mTarget;
    final int itemCount = target.getCount();
    final int childCount = target.getChildCount();
    final int firstPosition = target.getFirstVisiblePosition();
    final int lastPosition = firstPosition + childCount;

    if (direction > 0) {
        // Are we already showing the entire last item?
        if (lastPosition >= itemCount) {
            final View lastView = target.getChildAt(childCount - 1);
            if (lastView.getBottom() <= target.getHeight()) {
                return false;
            }
        }
    } else if (direction < 0) {
        // Are we already showing the entire first item?
        if (firstPosition <= 0) {
            final View firstView = target.getChildAt(0);
            if (firstView.getTop() >= 0) {
                return false;
            }
        }
    } else {
        // The behavior for direction 0 is undefined and we can return
        // whatever we want.
        return false;
    }

    return true;
}
 

@Override
public boolean canTargetScrollVertically(int direction) {
    final ListView target = mTarget;
    final int itemCount = target.getCount();
    final int childCount = target.getChildCount();
    final int firstPosition = target.getFirstVisiblePosition();
    final int lastPosition = firstPosition + childCount;

    if (direction > 0) {
        // Are we already showing the entire last item?
        if (lastPosition >= itemCount) {
            final View lastView = target.getChildAt(childCount - 1);
            if (lastView.getBottom() <= target.getHeight()) {
                return false;
            }
        }
    } else if (direction < 0) {
        // Are we already showing the entire first item?
        if (firstPosition <= 0) {
            final View firstView = target.getChildAt(0);
            if (firstView.getTop() >= 0) {
                return false;
            }
        }
    } else {
        // The behavior for direction 0 is undefined and we can return
        // whatever we want.
        return false;
    }

    return true;
}
 

@Override
public boolean canTargetScrollVertically(int direction) {
    final ListView target = mTarget;
    final int itemCount = target.getCount();
    final int childCount = target.getChildCount();
    final int firstPosition = target.getFirstVisiblePosition();
    final int lastPosition = firstPosition + childCount;

    if (direction > 0) {
        // Are we already showing the entire last item?
        if (lastPosition >= itemCount) {
            final View lastView = target.getChildAt(childCount - 1);
            if (lastView.getBottom() <= target.getHeight()) {
                return false;
            }
        }
    } else if (direction < 0) {
        // Are we already showing the entire first item?
        if (firstPosition <= 0) {
            final View firstView = target.getChildAt(0);
            if (firstView.getTop() >= 0) {
                return false;
            }
        }
    } else {
        // The behavior for direction 0 is undefined and we can return
        // whatever we want.
        return false;
    }

    return true;
}
 

/**
 * Gets all the touch events and updates dragging related logic. Note that if this app menu
 * is initiated by software UI control, then the control should set onTouchListener and forward
 * all the events to this method because the initial UI control that processed ACTION_DOWN will
 * continue to get all the subsequent events.
 *
 * @param event Touch event to be processed.
 * @param button Button that received the touch event.
 * @return Whether the event is handled.
 */
boolean handleDragging(MotionEvent event, View button) {
    if (!mAppMenu.isShowing() || !mDragScrolling.isRunning()) return false;

    // We will only use the screen space coordinate (rawX, rawY) to reduce confusion.
    // This code works across many different controls, so using local coordinates will be
    // a disaster.

    final float rawX = event.getRawX();
    final float rawY = event.getRawY();
    final int roundedRawX = Math.round(rawX);
    final int roundedRawY = Math.round(rawY);
    final int eventActionMasked = event.getActionMasked();
    final long timeSinceDown = event.getEventTime() - event.getDownTime();
    final ListView listView = mAppMenu.getPopup().getListView();

    mLastTouchX = rawX;
    mLastTouchY = rawY;
    mMenuButtonScreenCenterY = getScreenVisibleRect(button).centerY();

    if (eventActionMasked == MotionEvent.ACTION_CANCEL) {
        mAppMenu.dismiss();
        return true;
    } else if (eventActionMasked == MotionEvent.ACTION_UP) {
        nativeRecordAppMenuTouchDuration(timeSinceDown);
    }

    mIsSingleTapCanceled |= timeSinceDown > mTapTimeout;
    mIsSingleTapCanceled |= !pointInView(button, event.getX(), event.getY(), mScaledTouchSlop);
    if (!mIsSingleTapCanceled && eventActionMasked == MotionEvent.ACTION_UP) {
        RecordUserAction.record("MobileUsingMenuBySwButtonTap");
        finishDragging();
    }

    // After this line, drag scrolling is happening.
    if (!mDragScrolling.isRunning()) return false;

    boolean didPerformClick = false;
    int itemAction = ITEM_ACTION_CLEAR_HIGHLIGHT_ALL;
    switch (eventActionMasked) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_MOVE:
            itemAction = ITEM_ACTION_HIGHLIGHT;
            break;
        case MotionEvent.ACTION_UP:
            itemAction = ITEM_ACTION_PERFORM;
            break;
        default:
            break;
    }
    didPerformClick = menuItemAction(roundedRawX, roundedRawY, itemAction);

    if (eventActionMasked == MotionEvent.ACTION_UP && !didPerformClick) {
        RecordUserAction.record("MobileUsingMenuBySwButtonDragging");
        mAppMenu.dismiss();
    } else if (eventActionMasked == MotionEvent.ACTION_MOVE) {
        // Auto scrolling on the top or the bottom of the listView.
        if (listView.getHeight() > 0) {
            float autoScrollAreaRatio = Math.min(AUTO_SCROLL_AREA_MAX_RATIO,
                    mItemRowHeight * 1.2f / listView.getHeight());
            float normalizedY =
                    (rawY - getScreenVisibleRect(listView).top) / listView.getHeight();
            if (normalizedY < autoScrollAreaRatio) {
                // Top
                mDragScrollingVelocity = (normalizedY / autoScrollAreaRatio - 1.0f)
                        * mAutoScrollFullVelocity;
            } else if (normalizedY > 1.0f - autoScrollAreaRatio) {
                // Bottom
                mDragScrollingVelocity = ((normalizedY - 1.0f) / autoScrollAreaRatio + 1.0f)
                        * mAutoScrollFullVelocity;
            } else {
                // Middle or not scrollable.
                mDragScrollingVelocity = 0.0f;
            }
        }
    }

    return true;
}
 

/**
 * Gets all the touch events and updates dragging related logic. Note that if this app menu
 * is initiated by software UI control, then the control should set onTouchListener and forward
 * all the events to this method because the initial UI control that processed ACTION_DOWN will
 * continue to get all the subsequent events.
 *
 * @param event Touch event to be processed.
 * @param button Button that received the touch event.
 * @return Whether the event is handled.
 */
boolean handleDragging(MotionEvent event, View button) {
    if (!mAppMenu.isShowing() || !mDragScrolling.isRunning()) return false;

    // We will only use the screen space coordinate (rawX, rawY) to reduce confusion.
    // This code works across many different controls, so using local coordinates will be
    // a disaster.

    final float rawX = event.getRawX();
    final float rawY = event.getRawY();
    final int roundedRawX = Math.round(rawX);
    final int roundedRawY = Math.round(rawY);
    final int eventActionMasked = event.getActionMasked();
    final long timeSinceDown = event.getEventTime() - event.getDownTime();
    final ListView listView = mAppMenu.getPopup().getListView();

    mLastTouchX = rawX;
    mLastTouchY = rawY;
    mMenuButtonScreenCenterY = getScreenVisibleRect(button).centerY();

    if (eventActionMasked == MotionEvent.ACTION_CANCEL) {
        mAppMenu.dismiss();
        return true;
    } else if (eventActionMasked == MotionEvent.ACTION_UP) {
        nativeRecordAppMenuTouchDuration(timeSinceDown);
    }

    mIsSingleTapCanceled |= timeSinceDown > mTapTimeout;
    mIsSingleTapCanceled |= !pointInView(button, event.getX(), event.getY(), mScaledTouchSlop);
    if (!mIsSingleTapCanceled && eventActionMasked == MotionEvent.ACTION_UP) {
        RecordUserAction.record("MobileUsingMenuBySwButtonTap");
        finishDragging();
    }

    // After this line, drag scrolling is happening.
    if (!mDragScrolling.isRunning()) return false;

    boolean didPerformClick = false;
    int itemAction = ITEM_ACTION_CLEAR_HIGHLIGHT_ALL;
    switch (eventActionMasked) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_MOVE:
            itemAction = ITEM_ACTION_HIGHLIGHT;
            break;
        case MotionEvent.ACTION_UP:
            itemAction = ITEM_ACTION_PERFORM;
            break;
        default:
            break;
    }
    didPerformClick = menuItemAction(roundedRawX, roundedRawY, itemAction);

    if (eventActionMasked == MotionEvent.ACTION_UP && !didPerformClick) {
        RecordUserAction.record("MobileUsingMenuBySwButtonDragging");
        mAppMenu.dismiss();
    } else if (eventActionMasked == MotionEvent.ACTION_MOVE) {
        // Auto scrolling on the top or the bottom of the listView.
        if (listView.getHeight() > 0) {
            float autoScrollAreaRatio = Math.min(AUTO_SCROLL_AREA_MAX_RATIO,
                    mItemRowHeight * 1.2f / listView.getHeight());
            float normalizedY =
                    (rawY - getScreenVisibleRect(listView).top) / listView.getHeight();
            if (normalizedY < autoScrollAreaRatio) {
                // Top
                mDragScrollingVelocity = (normalizedY / autoScrollAreaRatio - 1.0f)
                        * mAutoScrollFullVelocity;
            } else if (normalizedY > 1.0f - autoScrollAreaRatio) {
                // Bottom
                mDragScrollingVelocity = ((normalizedY - 1.0f) / autoScrollAreaRatio + 1.0f)
                        * mAutoScrollFullVelocity;
            } else {
                // Middle or not scrollable.
                mDragScrollingVelocity = 0.0f;
            }
        }
    }

    return true;
}
 

/**
 * Gets all the touch events and updates dragging related logic. Note that if this app menu
 * is initiated by software UI control, then the control should set onTouchListener and forward
 * all the events to this method because the initial UI control that processed ACTION_DOWN will
 * continue to get all the subsequent events.
 *
 * @param event Touch event to be processed.
 * @param button Button that received the touch event.
 * @return Whether the event is handled.
 */
boolean handleDragging(MotionEvent event, View button) {
    if (!mAppMenu.isShowing() || !mDragScrolling.isRunning()) return false;

    // We will only use the screen space coordinate (rawX, rawY) to reduce confusion.
    // This code works across many different controls, so using local coordinates will be
    // a disaster.

    final float rawX = event.getRawX();
    final float rawY = event.getRawY();
    final int roundedRawX = Math.round(rawX);
    final int roundedRawY = Math.round(rawY);
    final int eventActionMasked = event.getActionMasked();
    final long timeSinceDown = event.getEventTime() - event.getDownTime();
    final ListView listView = mAppMenu.getPopup().getListView();

    mLastTouchX = rawX;
    mLastTouchY = rawY;
    mMenuButtonScreenCenterY = getScreenVisibleRect(button).centerY();

    if (eventActionMasked == MotionEvent.ACTION_CANCEL) {
        mAppMenu.dismiss();
        return true;
    } else if (eventActionMasked == MotionEvent.ACTION_UP) {
        nativeRecordAppMenuTouchDuration(timeSinceDown);
    }

    mIsSingleTapCanceled |= timeSinceDown > mTapTimeout;
    mIsSingleTapCanceled |= !pointInView(button, event.getX(), event.getY(), mScaledTouchSlop);
    if (!mIsSingleTapCanceled && eventActionMasked == MotionEvent.ACTION_UP) {
        RecordUserAction.record("MobileUsingMenuBySwButtonTap");
        finishDragging();
    }

    // After this line, drag scrolling is happening.
    if (!mDragScrolling.isRunning()) return false;

    boolean didPerformClick = false;
    int itemAction = ITEM_ACTION_CLEAR_HIGHLIGHT_ALL;
    switch (eventActionMasked) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_MOVE:
            itemAction = ITEM_ACTION_HIGHLIGHT;
            break;
        case MotionEvent.ACTION_UP:
            itemAction = ITEM_ACTION_PERFORM;
            break;
        default:
            break;
    }
    didPerformClick = menuItemAction(roundedRawX, roundedRawY, itemAction);

    if (eventActionMasked == MotionEvent.ACTION_UP && !didPerformClick) {
        RecordUserAction.record("MobileUsingMenuBySwButtonDragging");
        mAppMenu.dismiss();
    } else if (eventActionMasked == MotionEvent.ACTION_MOVE) {
        // Auto scrolling on the top or the bottom of the listView.
        if (listView.getHeight() > 0) {
            float autoScrollAreaRatio = Math.min(AUTO_SCROLL_AREA_MAX_RATIO,
                    mItemRowHeight * 1.2f / listView.getHeight());
            float normalizedY =
                    (rawY - getScreenVisibleRect(listView).top) / listView.getHeight();
            if (normalizedY < autoScrollAreaRatio) {
                // Top
                mDragScrollingVelocity = (normalizedY / autoScrollAreaRatio - 1.0f)
                        * mAutoScrollFullVelocity;
            } else if (normalizedY > 1.0f - autoScrollAreaRatio) {
                // Bottom
                mDragScrollingVelocity = ((normalizedY - 1.0f) / autoScrollAreaRatio + 1.0f)
                        * mAutoScrollFullVelocity;
            } else {
                // Middle or not scrollable.
                mDragScrollingVelocity = 0.0f;
            }
        }
    }

    return true;
}