下面列出了androidx.annotation.LayoutRes#androidx.recyclerview.widget.RecyclerView 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_licenses);
RecyclerView recyclerView = findViewById(R.id.rv_licenses);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.getRecycledViewPool().setMaxRecycledViews(0, 16);
LicensesAdapter adapter = new LicensesAdapter(this);
recyclerView.setAdapter(adapter);
LicensesViewModel viewModel = new ViewModelProvider(this).get(LicensesViewModel.class);
viewModel.getLicenses().observe(this, adapter::setLicenses);
}
@Override
protected void onContentViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onContentViewCreated(view, savedInstanceState);
setTitle(R.string.installer_select_theme);
getPositiveButton().setVisibility(View.GONE);
getNegativeButton().setOnClickListener(v -> dismiss());
RecyclerView recycler = (RecyclerView) view;
recycler.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
ThemeAdapter adapter = new ThemeAdapter(requireContext());
adapter.setThemes(Theme.getInstance(requireContext()).getThemes());
adapter.setOnThemeInteractionListener(this);
mBillingManager.getDonationStatus().observe(this, adapter::setDonationStatus);
recycler.setAdapter(adapter);
revealBottomSheet();
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view);
int column = position % spanCount;
if (includeEdge) {
outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)
outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)
if (position < spanCount) {
outRect.top = spacing;
}
outRect.bottom = spacing;
} else {
outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)
outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f / spanCount) * spacing)
if (position >= spanCount) {
outRect.top = spacing;
}
}
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable final Bundle savedInstanceState) {
if (isNewInstance()) {
mFragmentView = inflater.inflate(R.layout.fragment_item, container, false);
mEmptyView = mFragmentView.findViewById(R.id.empty);
mRecyclerView = (RecyclerView) mFragmentView.findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new SnappyLinearLayoutManager(getActivity(), true));
mItemDecoration = new CommentItemDecoration(getActivity());
mRecyclerView.addItemDecoration(mItemDecoration);
mSwipeRefreshLayout = (SwipeRefreshLayout) mFragmentView.findViewById(R.id.swipe_layout);
mSwipeRefreshLayout.setColorSchemeResources(R.color.white);
mSwipeRefreshLayout.setProgressBackgroundColorSchemeResource(R.color.redA200);
mSwipeRefreshLayout.setOnRefreshListener(() -> {
if (TextUtils.isEmpty(mItemId)) {
return;
}
mCacheMode = ItemManager.MODE_NETWORK;
if (mAdapter != null) {
mAdapter.setCacheMode(mCacheMode);
}
loadKidData();
});
}
return mFragmentView;
}
private boolean isLastRow(RecyclerView parent, int pos, int spanCount,
int childCount) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
int lines = childCount % spanCount == 0 ? childCount / spanCount : childCount / spanCount + 1;
return lines == pos / spanCount + 1;
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
int orientation = ((StaggeredGridLayoutManager) layoutManager)
.getOrientation();
if (orientation == StaggeredGridLayoutManager.VERTICAL) {
childCount = childCount - childCount % spanCount;
if (pos >= childCount)
return true;
} else {
if ((pos + 1) % spanCount == 0) {
return true;
}
}
}
return false;
}
private void drawVertical(Canvas canvas, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();
final int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++) {
final View child = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + layoutParams.rightMargin;
final int right = left + space;
if (mDivider != null) {
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);
}
}
}
public void close() {
if(isExpand){
ViewGroup.LayoutParams layoutParams = getLayoutParams();
layoutParams.height = maxHeight;
for (int i = 0; i < getChildCount(); i++) {
if (getChildAt(i) instanceof RecyclerView) {
final RecyclerView recyclerView = ((RecyclerView) getChildAt(i));
if (recyclerView.getLayoutManager() instanceof ScrollChange) {
((ScrollChange) recyclerView.getLayoutManager()).setScrollEnabled(false);
}
}
}
setLayoutParams(layoutParams);
isExpand = false;
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
if (dragState == DragState.ENDED) {
finishReorder(view);
return;
}
int itemPosition = recyclerView.getChildAdapterPosition(view);
if (itemPosition == selectedDragItemPosition) {
view.setVisibility(View.INVISIBLE);
return;
}
//Make sure the view is visible
view.setVisibility(View.VISIBLE);
//Calculate the new offsets
updateFloatingItemCenter();
setVerticalOffsets(view, itemPosition, floatingItemCenter, outRect);
setHorizontalOffsets(view, itemPosition, floatingItemCenter, outRect);
}
private RecyclerView.ViewHolder getItemViewHolder(final ViewGroup parent, final Section section) {
View view;
if (section.isItemViewWillBeProvided()) {
view = section.getItemView(parent);
if (view == null) {
throw new NullPointerException("Section.getItemView() returned null");
}
} else {
final Integer resId = section.getItemResourceId();
if (resId == null) {
throw new NullPointerException("Missing 'item' resource id");
}
view = inflate(resId, parent);
}
return section.getItemViewHolder(view);
}
@Override
public void onChanged() {
if (child instanceof RecyclerView) {
RecyclerView.Adapter<?> adapter = ((RecyclerView) child).getAdapter();
if (adapter != null && emptyView != null) {
if (adapter.getItemCount() == 0) {
if (!gone)
setArrowsVisibility(false);
if (emptyView instanceof TextView) {
((TextView) emptyView).setText(empty);
} else
emptyView.setVisibility(VISIBLE);
} else {
if (emptyView instanceof TextView) {
((TextView) emptyView).setText("");
} else
emptyView.setVisibility(INVISIBLE);
if (!gone)
setArrowsVisibility(true);
}
}
}
}
/**
* add animation when you want to show time
*
* @param holder
*/
private void addAnimation(RecyclerView.ViewHolder holder) {
if (mOpenAnimationEnable) {
if (!mFirstOnlyEnable || holder.getLayoutPosition() > mLastPosition) {
BaseAnimation animation = null;
if (mCustomAnimation != null) {
animation = mCustomAnimation;
} else {
animation = mSelectAnimation;
}
for (Animator anim : animation.getAnimators(holder.itemView)) {
startAnim(anim, holder.getLayoutPosition());
}
mLastPosition = holder.getLayoutPosition();
}
}
}
@Override
public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
final RecyclerView recyclerView = (RecyclerView) target;
final View firstChild = recyclerView.getChildAt(0);
final int childAdapterPosition = recyclerView.getChildAdapterPosition(firstChild);
Log.e("onNestedPreFling", "position:" + childAdapterPosition + " x:" + firstChild.getY() + "");
//不做拦截 可以传递给子View
return false;
}
@Override public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
mListener.onItemClick(childView, view.getChildPosition(childView));
return true;
}
return false;
}
@SuppressLint("RestrictedApi")
@Override
protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
return new PreferenceGroupAdapter(preferenceScreen) {
@Override
public void onPreferenceHierarchyChange(Preference preference) {
if (preference != null)
setAllPreferencesToAvoidHavingExtraSpace(preference);
super.onPreferenceHierarchyChange(preference);
}
};
}
@Override protected void animateRemoveImpl(final RecyclerView.ViewHolder holder) {
ViewCompat.animate(holder.itemView)
.scaleX(0)
.scaleY(0)
.setDuration(getRemoveDuration())
.setInterpolator(mInterpolator)
.setListener(new DefaultRemoveVpaListener(holder))
.setStartDelay(getRemoveDelay(holder))
.start();
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
JoinSheetUserCell cell = (JoinSheetUserCell) holder.itemView;
if (position < chatInvite.participants.size()) {
cell.setUser(chatInvite.participants.get(position));
} else {
int participants_count;
if (chatInvite.chat != null) {
participants_count = chatInvite.chat.participants_count;
} else {
participants_count = chatInvite.participants_count;
}
cell.setCount(participants_count - chatInvite.participants.size());
}
}
private void setUpRecyclerView() {
ViewUtil.setUpFastScrollRecyclerViewColor(this, ((FastScrollRecyclerView) recyclerView), ThemeStore.accentColor(this));
recyclerView.setLayoutManager(new LinearLayoutManager(this));
if (playlist instanceof AbsCustomPlaylist) {
adapter = new PlaylistSongAdapter(this, new ArrayList<>(), R.layout.item_list, false, this);
recyclerView.setAdapter(adapter);
} else {
recyclerViewDragDropManager = new RecyclerViewDragDropManager();
final GeneralItemAnimator animator = new RefactoredDefaultItemAnimator();
adapter = new OrderablePlaylistSongAdapter(this, new ArrayList<>(), R.layout.item_list, false, this, (fromPosition, toPosition) -> {
if (PlaylistsUtil.moveItem(PlaylistDetailActivity.this, playlist.id, fromPosition, toPosition)) {
Song song = adapter.getDataSet().remove(fromPosition);
adapter.getDataSet().add(toPosition, song);
adapter.notifyItemMoved(fromPosition, toPosition);
}
});
wrappedAdapter = recyclerViewDragDropManager.createWrappedAdapter(adapter);
recyclerView.setAdapter(wrappedAdapter);
recyclerView.setItemAnimator(animator);
recyclerViewDragDropManager.attachRecyclerView(recyclerView);
}
adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onChanged() {
super.onChanged();
checkIsEmpty();
}
});
}
@VisibleForTesting void validateNewViewItems(FeatureController<MODEL> controller, List<ViewItem> viewItems) {
if (viewItems == null || viewItems.isEmpty()) {
// null - there is no change in the controller to update
// empty - this controller has no views
return;
}
for (ViewItem viewItem : viewItems) {
if(viewItem.viewType == RecyclerView.INVALID_TYPE) {
String template = "The Model %s of a ViewItem is associated to a "
+ "ViewTypeDelegate that has not been "
+ "registered in the controller %s";
throw new RuntimeException(String.format(template, viewItem.model, controller));
}
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
switch (viewType) {
case 0:
view = new AttachButton(mContext);
break;
case 1:
default:
view = new AttachBotButton(mContext);
break;
}
return new RecyclerListView.Holder(view);
}
@Override public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
super.onDetachedFromRecyclerView(recyclerView);
for (int i = 0; i < getItemCount(); i++) {
try {
((SearchResultItemView) getItem(i)).prepareToRecycle();
} catch (NullPointerException | ClassCastException e) {
}
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// Get context
this.mContext = parent.getContext();
// Create view by the view type.
if (viewType == TYPE_FOOTER) {
View view = LayoutInflater.from(mContext).inflate(R.layout.layout_loading_footer, parent, false);
return new LoadMoreViewHolder(view);
} else {
return mAdapter.onCreateViewHolder(parent, viewType);
}
}
@Override
public void onBindViewHolder(@NonNull final RecyclerView.ViewHolder holder, int position) {
switch (getItemViewType(position)) {
case TYPE_SECTION: {
((SectionViewHolder) holder).bind((SectionItem) itemList.get(position));
break;
}
case TYPE_NOTE_WITH_EXCERPT:
case TYPE_NOTE_WITHOUT_EXCERPT:
case TYPE_NOTE_ONLY_TITLE: {
((NoteViewHolder) holder).bind((DBNote) itemList.get(position), showCategory, mainColor, textColor, searchQuery);
break;
}
}
}
private void showQuizHint() {
int count = listView.getChildCount();
for (int a = answerStartRow; a < answerStartRow + answersCount; a++) {
RecyclerView.ViewHolder holder = listView.findViewHolderForAdapterPosition(a);
if (holder != null && holder.itemView instanceof PollEditTextCell) {
PollEditTextCell pollEditTextCell = (PollEditTextCell) holder.itemView;
if (pollEditTextCell.getTop() > AndroidUtilities.dp(40)) {
hintView.showForView(pollEditTextCell.getCheckBox(), true);
break;
}
}
}
}
@Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case REWARD_APP:
return new RewardAppInBundleViewHolder(LayoutInflater.from(parent.getContext())
.inflate(REWARD_APP, parent, false), appClickedEvents);
case APP:
return new AppInBundleViewHolder(LayoutInflater.from(parent.getContext())
.inflate(APP, parent, false), appClickedEvents, oneDecimalFormatter);
default:
throw new IllegalArgumentException("Wrong type of App");
}
}
private void drawHorizontal(Canvas canvas, RecyclerView parent) {
canvas.save();
final int top;
final int bottom;
//noinspection AndroidLintNewApi - NewApi lint fails to handle overrides.
if (parent.getClipToPadding()) {
top = parent.getPaddingTop();
bottom = parent.getHeight() - parent.getPaddingBottom();
canvas.clipRect(parent.getPaddingLeft(), top,
parent.getWidth() - parent.getPaddingRight(), bottom);
} else {
top = 0;
bottom = parent.getHeight();
}
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
parent.getLayoutManager().getDecoratedBoundsWithMargins(child, mBounds);
final int right = mBounds.right + Math.round(child.getTranslationX());
final int left = right - mDividerSize;
mDividerPaint.setColor(mDividerColor);
mDividerPaint.setStyle(Paint.Style.FILL);
canvas.drawRect(left + mMarginStart, top + mMarginTop, right - mMarginEnd, bottom - mMarginBottom, mDividerPaint);
}
canvas.restore();
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
switch (holder.getItemViewType()) {
case 0: {
LanguageCell textSettingsCell = (LanguageCell) holder.itemView;
LocaleController.LocaleInfo localeInfo;
boolean last;
if (search) {
localeInfo = searchResult.get(position);
last = position == searchResult.size() - 1;
} else if (!unofficialLanguages.isEmpty() && position >= 0 && position < unofficialLanguages.size()) {
localeInfo = unofficialLanguages.get(position);
last = position == unofficialLanguages.size() - 1;
} else {
if (!unofficialLanguages.isEmpty()) {
position -= unofficialLanguages.size() + 1;
}
localeInfo = sortedLanguages.get(position);
last = position == sortedLanguages.size() - 1;
}
if (localeInfo.isLocal()) {
textSettingsCell.setLanguage(localeInfo, String.format("%1$s (%2$s)", localeInfo.name, LocaleController.getString("LanguageCustom", R.string.LanguageCustom)), !last);
} else {
textSettingsCell.setLanguage(localeInfo, null, !last);
}
textSettingsCell.setLanguageSelected(localeInfo == LocaleController.getInstance().getCurrentLocaleInfo());
break;
}
case 1: {
ShadowSectionCell sectionCell = (ShadowSectionCell) holder.itemView;
if (!unofficialLanguages.isEmpty() && position == unofficialLanguages.size()) {
sectionCell.setBackgroundDrawable(Theme.getThemedDrawable(mContext, R.drawable.greydivider, Theme.key_windowBackgroundGrayShadow));
} else {
sectionCell.setBackgroundDrawable(Theme.getThemedDrawable(mContext, R.drawable.greydivider_bottom, Theme.key_windowBackgroundGrayShadow));
}
break;
}
}
}
private int checkHorizontalSwipe(RecyclerView.ViewHolder viewHolder, int flags) {
if ((flags & (LEFT | RIGHT)) != 0) {
final int dirFlag = mDx > 0 ? RIGHT : LEFT;
if (mVelocityTracker != null && mActivePointerId > -1) {
mVelocityTracker.computeCurrentVelocity(PIXELS_PER_SECOND,
mCallback.getSwipeVelocityThreshold(mMaxSwipeVelocity));
final float xVelocity = mVelocityTracker.getXVelocity(mActivePointerId);
final float yVelocity = mVelocityTracker.getYVelocity(mActivePointerId);
final int velDirFlag = xVelocity > 0f ? RIGHT : LEFT;
final float absXVelocity = Math.abs(xVelocity);
if ((velDirFlag & flags) != 0 && dirFlag == velDirFlag
&& absXVelocity >= mCallback.getSwipeEscapeVelocity(mSwipeEscapeVelocity)
&& absXVelocity > Math.abs(yVelocity)) {
return velDirFlag;
}
}
int width = mRecyclerView.getWidth();
//If the target layout follows the item view, the RecyclerView is wider than itself.
if (swipeTypeIsFollowing()) {
float swipeWidth = getSwipeWidth(viewHolder);
width += (int) swipeWidth;
}
final float threshold = width * mCallback
.getSwipeThreshold(viewHolder);
if ((flags & dirFlag) != 0 && Math.abs(mDx) > threshold) {
return dirFlag;
}
}
return 0;
}
@Override
public void onViewRecycled(RecyclerView.ViewHolder holder) {
super.onViewRecycled(holder);
int position = holder.getAdapterPosition();
if (null == mReqAdapter || isHeaderView(position) || isFooterView(position)) {
return;
}
mReqAdapter.onViewRecycled(holder);
}
@Override
public void onViewRecycled(@NonNull RecyclerView.ViewHolder holder) {
if (holder instanceof UserListingRecyclerViewAdapter.DataViewHolder) {
glide.clear(((UserListingRecyclerViewAdapter.DataViewHolder) holder).iconGifImageView);
((UserListingRecyclerViewAdapter.DataViewHolder) holder).subscribeButton.setVisibility(View.GONE);
}
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
final int resource = viewType == kViewType_Service ? R.layout.layout_info_service_item : viewType == kViewType_Characteristic ? R.layout.layout_info_characteristic_item : R.layout.layout_info_descriptor_item;
View view = LayoutInflater.from(parent.getContext()).inflate(resource, parent, false);
switch (viewType) {
case kViewType_Characteristic:
return new CharacteristicViewHolder(view);
case kViewType_Descriptor:
return new DescriptorViewHolder(view);
default:
return new ServiceViewHolder(view);
}
}