Java FlexibleViewHolder类代码示例

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void resetHeader(FlexibleViewHolder header) {
    restoreHeaderItemVisibility();
    // Clean the header container
    final View view = header.getContentView();
    removeViewFromParent(view);
    // Reset translation on removed header
    view.setTranslationX(0);
    view.setTranslationY(0);
    if (!header.itemView.equals(view)) {
        addViewToParent(((ViewGroup) header.itemView), view);
    }
    header.setIsRecyclable(true);
    // #294 - Expandable header is not resized / redrawn on automatic configuration change when sticky headers are enabled
    header.itemView.getLayoutParams().width = view.getLayoutParams().width;
    header.itemView.getLayoutParams().height = view.getLayoutParams().height;
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position, List payloads) {
    // Bind the correct view elevation
    if (holder instanceof FlexibleViewHolder) {
        FlexibleViewHolder flexHolder = (FlexibleViewHolder) holder;
        flexHolder.getContentView().setActivated(isSelected(position));
        if (flexHolder.getContentView().isActivated() && flexHolder.getActivationElevation() > 0)
            ViewCompat.setElevation(flexHolder.getContentView(), flexHolder.getActivationElevation());
        else if (flexHolder.getActivationElevation() > 0) //Leave unaltered the default elevation
            ViewCompat.setElevation(flexHolder.getContentView(), 0);
        mBoundViewHolders.add(flexHolder);
    } else {
        // When user scrolls, this line binds the correct selection status
        holder.itemView.setActivated(isSelected(position));
    }
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void updateHeader(int headerPosition, boolean updateHeaderContent) {
		// Check if there is a new header to be sticky
		if (mHeaderPosition != headerPosition) {
			// #244 - Don't animate if header is already visible at the first layout position
			int firstVisibleItemPosition = Utils.findFirstVisibleItemPosition(mRecyclerView.getLayoutManager());
			// Animate if headers were hidden, but don't if configuration changed (rotation)
			if (displayWithAnimation && mHeaderPosition == RecyclerView.NO_POSITION &&
					headerPosition != firstVisibleItemPosition) {
				displayWithAnimation = false;
				mStickyHolderLayout.setAlpha(0);
				mStickyHolderLayout.animate().alpha(1).start();
			} else {
				mStickyHolderLayout.setAlpha(1);
			}
			mHeaderPosition = headerPosition;
			FlexibleViewHolder holder = getHeaderViewHolder(headerPosition);
			if (FlexibleAdapter.DEBUG)
				Log.d(TAG, "swapHeader newHeaderPosition=" + mHeaderPosition);
			swapHeader(holder);
		} else if (updateHeaderContent) {
			// #299 - ClassCastException after click on expanded sticky header when AutoCollapse is enabled
//			mStickyHeaderViewHolder = getHeaderViewHolder(headerPosition);
//			mStickyHeaderViewHolder.setBackupPosition(headerPosition);
//			mAdapter.onBindViewHolder(mStickyHeaderViewHolder, headerPosition);
//			ensureHeaderParent();
			//FIXME: update viewHolder when sticky
		}
		translateHeader();
	}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void swapHeader(FlexibleViewHolder newHeader) {
	if (mStickyHeaderViewHolder != null) {
		resetHeader(mStickyHeaderViewHolder);
	}
	mStickyHeaderViewHolder = newHeader;
	if (mStickyHeaderViewHolder != null) {
		mStickyHeaderViewHolder.setIsRecyclable(false);
		ensureHeaderParent();
	}
	onStickyHeaderChange(mHeaderPosition);
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void resetHeader(FlexibleViewHolder header) {
	restoreHeaderItemVisibility();
	// Clean the header container
	final View view = header.getContentView();
	removeViewFromParent(view);
	// Reset translation on removed header
	view.setTranslationX(0);
	view.setTranslationY(0);
	if (!header.itemView.equals(view))
		((ViewGroup) header.itemView).addView(view);
	header.setIsRecyclable(true);
	// #294 - Expandable header is not resized / redrawn on automatic configuration change when sticky headers are enabled
	header.itemView.getLayoutParams().width = view.getLayoutParams().width;
	header.itemView.getLayoutParams().height = view.getLayoutParams().height;
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void notifySelectionChanged(int positionStart, int itemCount) {
	if (itemCount > 0) {
		// Avoid to rebind the VH, direct call to the itemView activation
		for (FlexibleViewHolder holder : mBoundViewHolders) {
			if (isSelectable(holder.getAdapterPosition()))
				holder.toggleActivation();
		}
		// Use classic notification, in case FlexibleViewHolder is not implemented
		if (mBoundViewHolders.isEmpty())
			notifyItemRangeChanged(positionStart, itemCount, Payload.SELECTION);
	}
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position, List payloads) {
	// When user scrolls, this line binds the correct selection status
	holder.itemView.setActivated(isSelected(position));
	// Bind the correct view elevation
	if (holder instanceof FlexibleViewHolder) {
		FlexibleViewHolder flexHolder = (FlexibleViewHolder) holder;
		if (holder.itemView.isActivated() && flexHolder.getActivationElevation() > 0)
			ViewCompat.setElevation(holder.itemView, flexHolder.getActivationElevation());
		else if (flexHolder.getActivationElevation() > 0) //Leave unaltered the default elevation
			ViewCompat.setElevation(holder.itemView, 0);
		mBoundViewHolders.add(flexHolder);
	}
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void updateHeader(int headerPosition, boolean updateHeaderContent) {
        // Check if there is a new header to be sticky
        if (mHeaderPosition != headerPosition && mStickyHolderLayout != null) {
            // #244 - Don't animate if header is already visible at the first layout position
            int firstVisibleItemPosition = mAdapter.getFlexibleLayoutManager().findFirstVisibleItemPosition();
            // Animate if headers were hidden, but don't if configuration changed (rotation)
            if (displayWithAnimation && mHeaderPosition == RecyclerView.NO_POSITION &&
                    headerPosition != firstVisibleItemPosition) {
                displayWithAnimation = false;
                mStickyHolderLayout.setAlpha(0);
                mStickyHolderLayout.animate().alpha(1).start();
            } else {
                mStickyHolderLayout.setAlpha(1);
            }
            int oldHeaderPosition = mHeaderPosition;
            mHeaderPosition = headerPosition;
            FlexibleViewHolder holder = getHeaderViewHolder(headerPosition);
            Log.d("swapHeader newHeaderPosition=%s", mHeaderPosition);
            swapHeader(holder, oldHeaderPosition);
        } else if (updateHeaderContent) {
            // #299 - ClassCastException after click on expanded sticky header when AutoCollapse is enabled
//			mStickyHeaderViewHolder = getHeaderViewHolder(headerPosition);
//			mStickyHeaderViewHolder.setBackupPosition(headerPosition);
            mAdapter.onBindViewHolder(mStickyHeaderViewHolder, headerPosition);
            ensureHeaderParent();
        }
        translateHeader();
    }
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void swapHeader(FlexibleViewHolder newHeader, int oldHeaderPosition) {
    if (mStickyHeaderViewHolder != null) {
        resetHeader(mStickyHeaderViewHolder);
    }
    mStickyHeaderViewHolder = newHeader;
    mStickyHeaderViewHolder.setIsRecyclable(false);
    ensureHeaderParent();
    onStickyHeaderChange(mHeaderPosition, oldHeaderPosition);
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
private void notifySelectionChanged(int positionStart, int itemCount) {
    if (itemCount > 0) {
        // Avoid to rebind the VH, direct call to the itemView activation
        for (FlexibleViewHolder flexHolder : mBoundViewHolders) {
            flexHolder.toggleActivation();
        }
        // Use classic notification, in case FlexibleViewHolder is not implemented
        if (mBoundViewHolders.isEmpty())
            notifyItemRangeChanged(positionStart, itemCount, Payload.SELECTION);
    }
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
@Override
public void onViewRecycled(RecyclerView.ViewHolder holder) {
	if (holder instanceof FlexibleViewHolder)
		mBoundViewHolders.remove(holder);
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
/**
	 * Performs checks to scroll animate the itemView and in case, it animates the view.
	 * <p><b>Note:</b> If you have to change at runtime the LayoutManager <i>and</i> add
	 * Scrollable Headers too, consider to add them in post, using a {@code delay >= 0},
	 * otherwise scroll animations on all items will not start correctly.</p>
	 *
	 * @param holder   the ViewHolder just bound
	 * @param position the current item position
	 */
	@SuppressWarnings("ConstantConditions")
	protected final void animateView(final RecyclerView.ViewHolder holder, final int position) {
		if (mRecyclerView == null) return;

		// Use always the max child count reached
		if (mMaxChildViews < mRecyclerView.getChildCount()) {
			mMaxChildViews = mRecyclerView.getChildCount();
		}
		// Animate only during initial loading?
		if (onlyEntryAnimation && mLastAnimatedPosition >= mMaxChildViews) {
			shouldAnimate = false;
		}
		int lastVisiblePosition = Utils.findLastVisibleItemPosition(mRecyclerView.getLayoutManager());
//		if (DEBUG) {
//			Log.v(TAG, "shouldAnimate=" + shouldAnimate
//					+ " isFastScroll=" + isFastScroll
//					+ " isNotified=" + mAnimatorNotifierObserver.isPositionNotified()
//					+ " isReverseEnabled=" + isReverseEnabled
//					+ " mLastAnimatedPosition=" + mLastAnimatedPosition
//					+ (!isReverseEnabled ? " Pos>LasVisPos=" + (position > lastVisiblePosition) : "")
//					+ " mMaxChildViews=" + mMaxChildViews
//			);
//		}
		if (holder instanceof FlexibleViewHolder && shouldAnimate && !isFastScroll &&
				!mAnimatorNotifierObserver.isPositionNotified() &&
				(position > lastVisiblePosition || isReverseEnabled || isScrollableHeaderOrFooter(position) || (position == 0 && mMaxChildViews == 0))) {

			// Cancel animation is necessary when fling
			int hashCode = holder.itemView.hashCode();
			cancelExistingAnimation(hashCode);

			// User animators
			List<Animator> animators = new ArrayList<>();
			FlexibleViewHolder flexibleViewHolder = (FlexibleViewHolder) holder;
			flexibleViewHolder.scrollAnimators(animators, position, position >= lastVisiblePosition);

			// Execute the animations together
			AnimatorSet set = new AnimatorSet();
			set.playTogether(animators);
			set.setInterpolator(mInterpolator);
			// Single view duration
			long duration = mDuration;
			for (Animator animator : animators) {
				if (animator.getDuration() != DEFAULT_DURATION) {
					duration = animator.getDuration();
				}
			}
			//Log.v(TAG, "duration=" + duration);
			set.setDuration(duration);
			set.addListener(new HelperAnimatorListener(hashCode));
			if (mEntryStep) {
				// Stop stepDelay when screen is filled
				set.setStartDelay(calculateAnimationDelay(position));
			}
			set.start();
			mAnimators.put(hashCode, set);
			if (DEBUG) Log.v(TAG, "animateView    Scroll animation on position " + position);
		}
		mAnimatorNotifierObserver.clearNotified();
		// Update last animated position
		mLastAnimatedPosition = position;
	}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
@Override
public FlexibleViewHolder createViewHolder(View view, FlexibleAdapter adapter) {
    return null;
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
@Override
public void onViewRecycled(RecyclerView.ViewHolder holder) {
    if (holder instanceof FlexibleViewHolder)
        mBoundViewHolders.remove(holder);
}
 

import eu.davidea.viewholders.FlexibleViewHolder; //导入依赖的package包/类
/**
 * Performs checks to scroll animate the itemView and in case, it animates the view.
 * <p><b>Note:</b> If you have to change at runtime the LayoutManager <i>and</i> add
 * Scrollable Headers too, consider to add them in post, using a {@code delay >= 0},
 * otherwise scroll animations on all items will not start correctly.</p>
 *
 * @param holder   the ViewHolder just bound
 * @param position the current item position
 * @since 5.0.0-b1
 */
protected final void animateView(final RecyclerView.ViewHolder holder, final int position) {
    if (mRecyclerView == null) return;

    // Use always the max child count reached
    if (mMaxChildViews < mRecyclerView.getChildCount()) {
        mMaxChildViews = mRecyclerView.getChildCount();
    }
    // Animate only during initial loading?
    if (onlyEntryAnimation && mLastAnimatedPosition >= mMaxChildViews) {
        isForwardEnabled = false;
    }
    int lastVisiblePosition = getFlexibleLayoutManager().findLastVisibleItemPosition();
    log.v("isForwardEnabled=%s isReverseEnabled=%s isFastScroll=%s isNotified=%s mLastAnimatedPosition=%s mMaxChildViews=%s %s",
            isForwardEnabled, isReverseEnabled, isFastScroll, mAnimatorNotifierObserver.isPositionNotified(), mLastAnimatedPosition,
            mMaxChildViews, (!isReverseEnabled ? " Pos>LasVisPos=" + (position > lastVisiblePosition) : "")
    );
    if ((isForwardEnabled || isReverseEnabled)
            && !isFastScroll && holder instanceof FlexibleViewHolder
            && !mAnimatorNotifierObserver.isPositionNotified()
            && (isScrollableHeaderOrFooter(position)
            || (isForwardEnabled && position > lastVisiblePosition)
            || (isReverseEnabled && position < lastVisiblePosition)
            || (position == 0 && mMaxChildViews == 0))) {

        // Cancel animation is necessary when fling
        int hashCode = holder.itemView.hashCode();
        cancelExistingAnimation(hashCode);

        // User animators
        List<Animator> animators = new ArrayList<>();
        FlexibleViewHolder flexibleViewHolder = (FlexibleViewHolder) holder;
        flexibleViewHolder.scrollAnimators(animators, position, position >= lastVisiblePosition);

        // Execute the animations together
        AnimatorSet set = new AnimatorSet();
        set.playTogether(animators);
        set.setInterpolator(mInterpolator);
        // Single view duration
        long duration = mDuration;
        for (Animator animator : animators) {
            if (animator.getDuration() != DEFAULT_DURATION) {
                duration = animator.getDuration();
            }
        }
        log.v("duration=%s", duration);
        set.setDuration(duration);
        set.addListener(new HelperAnimatorListener(hashCode));
        if (mEntryStep) {
            // Stop stepDelay when screen is filled
            set.setStartDelay(calculateAnimationDelay(position));
        }
        set.start();
        mAnimators.put(hashCode, set);
        log.v("animateView    Scroll animation on position %s", position);
    }
    mAnimatorNotifierObserver.clearNotified();
    // Update last animated position
    mLastAnimatedPosition = position;
}