私は最近、 Grid View 用に指定された QuickReturn Libraryに出くわしました。
ライブラリのインポートはうまくいきましたが、テスト中に次のエラーが見つかりました。
私の問題を視覚化するために、YouTubeにビデオをアップロードしました。フッターのアニメーションは問題なく動作します。しかし、その特定のアイテムをスクロールすると、フッターがすぐに表示され、理由もなく再表示されます。
この問題は、Etsy の StaggeredGridView で GridView に指定されたライブラリを使用していることが原因であると推測されます。ライブラリのどのクラスが問題の原因であるかがわからないため、コードは投稿しません。調整することはありますか？
以下のコードでこれをどのように解決したかを見てください。これはのカスタムOnScrollListenerです。RecyclerViewGridLayoutManager
ここでより多くの例を見ることができます: https://github.com/lawloretienne/QuickReturn
public class QuickReturnFooterRecyclerViewFragment extends Fragment {
// region Member Variables
private String[] mValues;
private QuickReturnAnimationType mQuickReturnAnimationType;
private String mLayoutManagerType;
@InjectView(R.id.rv)
RecyclerView mRecyclerView;
@InjectView(R.id.quick_return_tv)
TextView mQuickReturnTextView;
// endregion
// region Constructors
public static QuickReturnFooterRecyclerViewFragment newInstance(Bundle extras) {
QuickReturnFooterRecyclerViewFragment fragment = new QuickReturnFooterRecyclerViewFragment();
fragment.setRetainInstance(true);
fragment.setArguments(extras);
return fragment;
}
public static QuickReturnFooterRecyclerViewFragment newInstance() {
QuickReturnFooterRecyclerViewFragment fragment = new QuickReturnFooterRecyclerViewFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
public QuickReturnFooterRecyclerViewFragment() {
}
// endregion
// region Lifecycle Methods
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(getArguments() != null) {
mQuickReturnAnimationType = QuickReturnAnimationType.valueOf(getArguments().getString("quick_return_animation_type"));
mLayoutManagerType = getArguments().getString("layout_manager");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_recyclerview_quick_return_footer, container, false);
ButterKnife.inject(this, view);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mValues = getResources().getStringArray(R.array.countries);
if(mLayoutManagerType.equals("linear")){
CountriesLinearLayoutAdapter countriesLinearLayoutAdapter = new CountriesLinearLayoutAdapter(getActivity(), Arrays.asList(mValues));
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), null));
mRecyclerView.setAdapter(countriesLinearLayoutAdapter);
} else if(mLayoutManagerType.equals("grid")) {
CountriesGridLayoutAdapter countriesGridLayoutAdapter = new CountriesGridLayoutAdapter(getActivity(), Arrays.asList(mValues));
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 2);
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.addItemDecoration(new GridSpacesItemDecoration(QuickReturnUtils.dp2px(getActivity(), 8)));
mRecyclerView.setAdapter(countriesGridLayoutAdapter);
}
int footerHeight = getActivity().getResources().getDimensionPixelSize(R.dimen.footer_height);
QuickReturnRecyclerViewOnScrollListener scrollListener;
SpeedyQuickReturnRecyclerViewOnScrollListener scrollListener2;
switch (mQuickReturnAnimationType){
case TRANSLATION_SIMPLE:
if(mLayoutManagerType.equals("grid")){
scrollListener = new QuickReturnRecyclerViewOnScrollListener.Builder(QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.minFooterTranslation(footerHeight)
.columnCount(2)
.build();
} else {
scrollListener = new QuickReturnRecyclerViewOnScrollListener.Builder(QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.minFooterTranslation(footerHeight)
.build();
}
mRecyclerView.setOnScrollListener(scrollListener);
break;
case TRANSLATION_SNAP:
if(mLayoutManagerType.equals("grid")){
scrollListener = new QuickReturnRecyclerViewOnScrollListener.Builder(QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.minFooterTranslation(footerHeight)
.columnCount(2)
.isSnappable(true)
.build();
} else {
scrollListener = new QuickReturnRecyclerViewOnScrollListener.Builder(QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.minFooterTranslation(footerHeight)
.isSnappable(true)
.build();
}
mRecyclerView.setOnScrollListener(scrollListener);
break;
case TRANSLATION_ANTICIPATE_OVERSHOOT:
if(mLayoutManagerType.equals("grid")){
scrollListener2 = new SpeedyQuickReturnRecyclerViewOnScrollListener.Builder(getActivity(), QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.columnCount(2)
.build();
} else {
scrollListener2 = new SpeedyQuickReturnRecyclerViewOnScrollListener.Builder(getActivity(), QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.build();
}
mRecyclerView.setOnScrollListener(scrollListener2);
break;
default:
if(mLayoutManagerType.equals("grid")){
scrollListener = new QuickReturnRecyclerViewOnScrollListener.Builder(QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.minFooterTranslation(footerHeight)
.columnCount(2)
.build();
} else {
scrollListener = new QuickReturnRecyclerViewOnScrollListener.Builder(QuickReturnViewType.FOOTER)
.footer(mQuickReturnTextView)
.minFooterTranslation(footerHeight)
.build();
}
mRecyclerView.setOnScrollListener(scrollListener);
break;
}
}
@Override
public void onDestroyView() {
super.onDestroyView();
ButterKnife.reset(this);
}
// endregion
}
public class QuickReturnRecyclerViewOnScrollListener extends RecyclerView.OnScrollListener {
// region Member Variables
private final QuickReturnViewType mQuickReturnViewType;
private final View mHeader;
private final int mMinHeaderTranslation;
private final View mFooter;
private final int mMinFooterTranslation;
private final int mColumnCount;
private final boolean mIsSnappable; // Can Quick Return view snap into place?
private int mPrevScrollY = 0;
private int mHeaderDiffTotal = 0;
private int mFooterDiffTotal = 0;
private List<RecyclerView.OnScrollListener> mExtraOnScrollListenerList = new ArrayList<>();
// endregion
// region Constructors
private QuickReturnRecyclerViewOnScrollListener(Builder builder) {
mQuickReturnViewType = builder.mQuickReturnViewType;
mHeader = builder.mHeader;
mMinHeaderTranslation = builder.mMinHeaderTranslation;
mFooter = builder.mFooter;
mMinFooterTranslation = builder.mMinFooterTranslation;
mColumnCount = builder.mColumnCount;
mIsSnappable = builder.mIsSnappable;
}
// endregion
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
// apply another list' s on scroll listener
for (RecyclerView.OnScrollListener listener : mExtraOnScrollListenerList) {
listener.onScrollStateChanged(recyclerView, newState);
}
if (newState == RecyclerView.SCROLL_STATE_IDLE && mIsSnappable) {
int midHeader = -mMinHeaderTranslation/2;
int midFooter = mMinFooterTranslation/2;
switch (mQuickReturnViewType) {
case HEADER:
if (-mHeaderDiffTotal > 0 && -mHeaderDiffTotal < midHeader) {
ObjectAnimator anim = ObjectAnimator.ofFloat(mHeader, "translationY", mHeader.getTranslationY(), 0);
anim.setDuration(100);
anim.start();
mHeaderDiffTotal = 0;
} else if (-mHeaderDiffTotal < -mMinHeaderTranslation && -mHeaderDiffTotal >= midHeader) {
ObjectAnimator anim = ObjectAnimator.ofFloat(mHeader, "translationY", mHeader.getTranslationY(), mMinHeaderTranslation);
anim.setDuration(100);
anim.start();
mHeaderDiffTotal = mMinHeaderTranslation;
}
break;
case FOOTER:
if (-mFooterDiffTotal > 0 && -mFooterDiffTotal < midFooter) { // slide up
ObjectAnimator anim = ObjectAnimator.ofFloat(mFooter, "translationY", mFooter.getTranslationY(), 0);
anim.setDuration(100);
anim.start();
mFooterDiffTotal = 0;
} else if (-mFooterDiffTotal < mMinFooterTranslation && -mFooterDiffTotal >= midFooter) { // slide down
ObjectAnimator anim = ObjectAnimator.ofFloat(mFooter, "translationY", mFooter.getTranslationY(), mMinFooterTranslation);
anim.setDuration(100);
anim.start();
mFooterDiffTotal = -mMinFooterTranslation;
}
break;
case BOTH:
if (-mHeaderDiffTotal > 0 && -mHeaderDiffTotal < midHeader) {
ObjectAnimator anim = ObjectAnimator.ofFloat(mHeader, "translationY", mHeader.getTranslationY(), 0);
anim.setDuration(100);
anim.start();
mHeaderDiffTotal = 0;
} else if (-mHeaderDiffTotal < -mMinHeaderTranslation && -mHeaderDiffTotal >= midHeader) {
ObjectAnimator anim = ObjectAnimator.ofFloat(mHeader, "translationY", mHeader.getTranslationY(), mMinHeaderTranslation);
anim.setDuration(100);
anim.start();
mHeaderDiffTotal = mMinHeaderTranslation;
}
if (-mFooterDiffTotal > 0 && -mFooterDiffTotal < midFooter) { // slide up
ObjectAnimator anim = ObjectAnimator.ofFloat(mFooter, "translationY", mFooter.getTranslationY(), 0);
anim.setDuration(100);
anim.start();
mFooterDiffTotal = 0;
} else if (-mFooterDiffTotal < mMinFooterTranslation && -mFooterDiffTotal >= midFooter) { // slide down
ObjectAnimator anim = ObjectAnimator.ofFloat(mFooter, "translationY", mFooter.getTranslationY(), mMinFooterTranslation);
anim.setDuration(100);
anim.start();
mFooterDiffTotal = -mMinFooterTranslation;
}
break;
case TWITTER:
if (-mHeaderDiffTotal > 0 && -mHeaderDiffTotal < midHeader) {
ObjectAnimator anim = ObjectAnimator.ofFloat(mHeader, "translationY", mHeader.getTranslationY(), 0);
anim.setDuration(100);
anim.start();
mHeaderDiffTotal = 0;
} else if (-mHeaderDiffTotal < -mMinHeaderTranslation && -mHeaderDiffTotal >= midHeader) {
ObjectAnimator anim = ObjectAnimator.ofFloat(mHeader, "translationY", mHeader.getTranslationY(), mMinHeaderTranslation);
anim.setDuration(100);
anim.start();
mHeaderDiffTotal = mMinHeaderTranslation;
}
if (-mFooterDiffTotal > 0 && -mFooterDiffTotal < midFooter) { // slide up
ObjectAnimator anim = ObjectAnimator.ofFloat(mFooter, "translationY", mFooter.getTranslationY(), 0);
anim.setDuration(100);
anim.start();
mFooterDiffTotal = 0;
} else if (-mFooterDiffTotal < mMinFooterTranslation && -mFooterDiffTotal >= midFooter) { // slide down
ObjectAnimator anim = ObjectAnimator.ofFloat(mFooter, "translationY", mFooter.getTranslationY(), mMinFooterTranslation);
anim.setDuration(100);
anim.start();
mFooterDiffTotal = -mMinFooterTranslation;
}
break;
}
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// apply extra on scroll listener
for (RecyclerView.OnScrollListener listener : mExtraOnScrollListenerList) {
listener.onScrolled(recyclerView, dx, dy);
}
int scrollY = QuickReturnUtils.getScrollY(recyclerView, mColumnCount);
// Log.d("", "onScrolled() : scrollY - "+scrollY);
int diff = mPrevScrollY - scrollY;
// Log.d("", "onScrolled() : diff - "+diff);
if(diff != 0){
switch (mQuickReturnViewType){
case HEADER:
if(diff < 0){ // scrolling down
mHeaderDiffTotal = Math.max(mHeaderDiffTotal + diff, mMinHeaderTranslation);
} else { // scrolling up
mHeaderDiffTotal = Math.min(Math.max(mHeaderDiffTotal + diff, mMinHeaderTranslation), 0);
}
mHeader.setTranslationY(mHeaderDiffTotal);
break;
case FOOTER:
if(diff < 0){ // scrolling down
mFooterDiffTotal = Math.max(mFooterDiffTotal + diff, -mMinFooterTranslation);
} else { // scrolling up
mFooterDiffTotal = Math.min(Math.max(mFooterDiffTotal + diff, -mMinFooterTranslation), 0);
}
mFooter.setTranslationY(-mFooterDiffTotal);
break;
case BOTH:
if(diff < 0){ // scrolling down
mHeaderDiffTotal = Math.max(mHeaderDiffTotal + diff, mMinHeaderTranslation);
mFooterDiffTotal = Math.max(mFooterDiffTotal + diff, -mMinFooterTranslation);
} else { // scrolling up
mHeaderDiffTotal = Math.min(Math.max(mHeaderDiffTotal + diff, mMinHeaderTranslation), 0);
mFooterDiffTotal = Math.min(Math.max(mFooterDiffTotal + diff, -mMinFooterTranslation), 0);
}
mHeader.setTranslationY(mHeaderDiffTotal);
mFooter.setTranslationY(-mFooterDiffTotal);
break;
case TWITTER:
if(diff < 0){ // scrolling down
if(scrollY > -mMinHeaderTranslation)
mHeaderDiffTotal = Math.max(mHeaderDiffTotal + diff, mMinHeaderTranslation);
if(scrollY > mMinFooterTranslation)
mFooterDiffTotal = Math.max(mFooterDiffTotal + diff, -mMinFooterTranslation);
} else { // scrolling up
mHeaderDiffTotal = Math.min(Math.max(mHeaderDiffTotal + diff, mMinHeaderTranslation), 0);
mFooterDiffTotal = Math.min(Math.max(mFooterDiffTotal + diff, -mMinFooterTranslation), 0);
}
mHeader.setTranslationY(mHeaderDiffTotal);
mFooter.setTranslationY(-mFooterDiffTotal);
default:
break;
}
}
mPrevScrollY = scrollY;
}
// region Helper Methods
public void registerExtraOnScrollListener(RecyclerView.OnScrollListener listener) {
mExtraOnScrollListenerList.add(listener);
}
// endregion
// region Inner Classes
public static class Builder {
// Required parameters
private final QuickReturnViewType mQuickReturnViewType;
// Optional parameters - initialized to default values
private View mHeader = null;
private int mMinHeaderTranslation = 0;
private View mFooter = null;
private int mMinFooterTranslation = 0;
private int mColumnCount = 1;
private boolean mIsSnappable = false;
public Builder(QuickReturnViewType quickReturnViewType) {
mQuickReturnViewType = quickReturnViewType;
}
public Builder header(View header){
mHeader = header;
return this;
}
public Builder minHeaderTranslation(int minHeaderTranslation){
mMinHeaderTranslation = minHeaderTranslation;
return this;
}
public Builder footer(View footer){
mFooter = footer;
return this;
}
public Builder minFooterTranslation(int minFooterTranslation){
mMinFooterTranslation = minFooterTranslation;
return this;
}
public Builder columnCount(int columnCount){
mColumnCount = columnCount;
return this;
}
public Builder isSnappable(boolean isSnappable){
mIsSnappable = isSnappable;
return this;
}
public QuickReturnRecyclerViewOnScrollListener build() {
return new QuickReturnRecyclerViewOnScrollListener(this);
}
}
// endregion
}