RecyclerView 项目不会同时改变可见性
RecyclerView items not changing visibility all at once
我试图在单击特定按钮时显示或隐藏我的 RecyclerView 项目，但由于某种原因没有任何反应。我什至尝试使用 adapter.notifyDataSetChanged();。需要修复什么，以便当必要的按钮（全部展开 或 全部折叠）出现时，此 RecyclerView 中的所有项目都变得可见或消失点击了吗？
public class MyFragment extends android.support.v4.app.Fragment {
private static final String TAG = MyActivity.class.getSimpleName();
public Boolean isSupposedToBeCollapsed;
private static final int ITEM_TYPE = 100;
private static final int HEADER_TYPE = 101;
private static final int HEADER_TYPE_2 = 102;
private static final int INTRO_TYPE = 103;
public MyFragment() {}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_rv, container, false);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
View v = getView();
assert v != null;
recyclerView = v.findViewById(R.id.my_recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
// SpannableStrings
int[] attrS = {R.attr.spannablestringtextColor};
TypedArray ta = getActivity().getTheme().obtainStyledAttributes(attrS);
int colorSS = ta.getColor(0, Color.BLACK); //Color.BLACK - default value (colour will change automatically depending on chosen theme)
Log.d(TAG, "clickMethod 1) " + Integer.toHexString(colorSS));
ta.recycle();
// SpannableString (start)
SpannableStringBuilder ssb1 = new SpannableStringBuilder();
SpannableString str1a = new SpannableString(getString(R.string.placeholder1_placeholder2_placeholder3,
" ", getString(R.string.title_1a), " "));
str1a.setSpan(new BackgroundColorSpan(Color.BLACK), 0, str1a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
str1a.setSpan(new ForegroundColorSpan(ContextCompat.getColor(getContext(), R.color.yellow)), 0, str1a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb1.append(str1a);
SpannableString str1b = new SpannableString(" " + getString(R.string.title_1b));
str1b.setSpan(new ForegroundColorSpan(colorSS), 0, str1b.length(), 0);
ssb1.append(str1b);
// SpannableString (end)
// SpannableString (start)
SpannableStringBuilder ssb2 = new SpannableStringBuilder();
SpannableString str2a = new SpannableString(getString(R.string.title_2a));
str2a.setSpan(new BackgroundColorSpan(Color.BLACK), 0, str2a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
str2a.setSpan(new ForegroundColorSpan(ContextCompat.getColor(getContext(), R.color.yellow)), 0, str2a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb2.append(str2a);
SpannableString str2b = new SpannableString(", " + getString(R.string.title_2b));
str2b.setSpan(new ForegroundColorSpan(colorSS), 0, str2b.length(), 0);
ssb2.append(str2b);
// SpannableString (end)
// init data
dataTitle = new ArrayList<>();
dataTitle.add(ssb1);
dataTitle.add(ssb2);
dataTitle.add(getString(R.string.title_c));
dataTitle.add(getString(R.string.title_d));
dataSubtitle = new ArrayList<>();
dataSubtitle.add(getString(R.string.subtitle_a));
dataSubtitle.add(getString(R.string.subtitle_b));
dataSubtitle.add(getString(R.string.subtitle_c));
dataSubtitle.add(getString(R.string.subtitle_d));
dataDescription = new ArrayList<>();
dataDescription.add(getString(R.string.description_a));
dataDescription.add(getString(R.string.description_b));
dataDescription.add(getString(R.string.description_c));
dataDescription.add(getString(R.string.description_d));
adapter = createAdapter();
recyclerView.setAdapter(adapter);
super.onActivityCreated(savedInstanceState);
}
RecyclerView recyclerView;
ArrayList<CharSequence> dataTitle;
ArrayList<String> dataSubtitle;
ArrayList<String> dataDescription;
RecyclerView.Adapter<MyFragment.ViewHolder> adapter;
// creates the adapter
private RecyclerView.Adapter<MyFragment.ViewHolder> createAdapter() {
return new RecyclerView.Adapter<TabFragmentWATTerminus.ViewHolder>() {
public Boolean expandedAll;
public Boolean collapsedAll;
@NonNull
@Override
public MyFragment.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int type) {
switch (type) {
case HEADER_TYPE:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_header, parent));
case HEADER_TYPE_2:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_header, parent));
case ITEM_TYPE:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_item_tv_itemtype, parent));
case INTRO_TYPE:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_item_tv_intro, parent));
default:
return new TabFragmentWATTerminus.ViewHolder(inflateHelper(R.layout.recyclerview_item_tv_itemtype, parent));
}
}
@Override
public void onBindViewHolder(@NonNull final MyFragment.ViewHolder viewHolder, int position) {
final Typeface iconFont = FontManager.getTypeface(getContext(), FontManager.FONTAWESOME);
final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
switch (getItemViewType(position)) {
case HEADER_TYPE:
Button expandButton = viewHolder.itemView.findViewById(R.id.button);
expandButton.setText(R.string.expand_all);
expandButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(expandedAll){
expandedAll = true;
expandRL(rlInformation, txtArrowTV);
adapter.notifyDataSetChanged();
} else if(collapsedAll){
collapsedAll = true;
collapseRL(rlInformation, txtArrowTV);
adapter.notifyDataSetChanged();
}
}
});
break;
case HEADER_TYPE_2:
Button collapseButton = viewHolder.itemView.findViewById(R.id.button);
collapseButton.setText(R.string.collapse_all);
collapseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.VISIBLE){ collapseRL(rlInformation, txtArrowTV);
adapter.notifyDataSetChanged();
}
});
break;
case INTRO_TYPE:
TextView tvIntroA = viewHolder.itemView.findViewById(R.id.tv_placeholder;
tvIntroA.setVisibility(View.GONE);
break;
case ITEM_TYPE:
// get the current item
CharSequence itemA = dataTitle.get(position - 3);
String itemB = dataSubtitle.get(position - 3);
String itemC = dataDescription.get(position - 3);
//
final TextView txtTitle = viewHolder.itemView.findViewById(R.id.tv_title);
txtTitle.setText(itemA);
final TextView txtSubtitle = viewHolder.itemView.findViewById(R.id.tv_subtitle);
txtSubtitle.setText(itemB);
final TextView txtDescription = viewHolder.itemView.findViewById(R.id.tv_description);
txtDescription.setText(itemC);
final TextView txtArrowTV = viewHolder.itemView.findViewById(R.id.tv_expandcollapsearrow);
txtArrowTV.setText(R.string.fa_icon_chevron_down);
txtArrowTV.setTypeface(iconFont);
// final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
rlInformation.setVisibility(View.GONE);
//
CardView cardView = viewHolder.itemView.findViewById(R.id.cardview_item);
LinearLayout mLinearLayoutTV = viewHolder.itemView.findViewById(R.id.cardview_titlerow);
//
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.GONE){
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
mLinearLayoutTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.GONE){
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
txtArrowTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.GONE){
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
break;
}
}
@Override
public int getItemCount() {
return dataTitle.size() + 3;
}
@Override
public int getItemViewType(int position) {
switch (position) {
case 0:
return HEADER_TYPE;
case 1:
return HEADER_TYPE_2;
case 2:
return INTRO_TYPE;
default: return ITEM_TYPE;
}
}
};
}
private View inflateHelper(int resId, ViewGroup parent) {
return LayoutInflater.from(getActivity()).inflate(resId, parent, false);
}
// inner class for viewholder to use,
class ViewHolder extends RecyclerView.ViewHolder {
ViewHolder(@NonNull View itemView) {
super(itemView);
}
}
public void expandRL(final RelativeLayout rlInformation, final TextView txtArrowTV) {
rlInformation.setVisibility(View.VISIBLE);
txtArrowTV.setText(R.string.fa_icon_chevron_up);
}
public void collapseRL(final RelativeLayout rlInformation, final TextView txtArrowTV) {
rlInformation.setVisibility(View.GONE);
txtArrowTV.setText(R.string.fa_icon_chevron_down);
}
}
编辑答案中的代码有点困难，因为大括号不是成对的。无论如何，您应该在适配器 class 中定义两个 boolean 字段（例如 expandedAll 和 collapsedAll）。在 collapseButton 和 expandButton 的点击侦听器中，为 expandedAll 和 collapsedAll 设置正确的值，然后调用 notifyDataSetChanged()。之后在 onBindViewHolder 中，当视图类型为 ITEM_TYPE 时，检查 expandedAll 和 collapsedAll 的值：
在我的片段中：
private RecyclerView.Adapter<MyFragment.ViewHolder> createAdapter() {
return new MyAdapter(dataTitle, dataSubtitle, dataDescription);
}
MyAdapter.java:
public class MyAdapter extends RecyclerView.Adapter<MyFragment.ViewHolder> {
public static final int ITEM_TYPE = 100;
public static final int HEADER_TYPE = 101;
public static final int HEADER_TYPE_2 = 102;
public static final int INTRO_TYPE = 103;
private ArrayList<CharSequence> dataTitle;
private ArrayList<String> dataSubtitle;
private ArrayList<String> dataDescription;
private Boolean expandedAll;
private Boolean collapsedAll;
public MyAdapter(ArrayList<CharSequence> dataTitle, ArrayList<String> dataSubtitle, ArrayList<String> dataDescription) {
this.dataTitle = dataTitle;
this.dataSubtitle = dataSubtitle;
this.dataDescription = dataDescription;
}
@NonNull
@Override
public MyFragment.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int type) {
switch (type) {
case HEADER_TYPE:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_header, parent));
case HEADER_TYPE_2:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_header, parent));
case ITEM_TYPE:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_item_tv_itemtype, parent));
case INTRO_TYPE:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_item_tv_intro, parent));
default:
return new TabFragmentWATTerminus.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_item_tv_itemtype, parent));
}
}
@Override
public void onBindViewHolder(@NonNull MyFragment.ViewHolder viewHolder, int position) {
final Typeface iconFont = FontManager.getTypeface(getContext(), FontManager.FONTAWESOME);
final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
switch (getItemViewType(position)) {
case HEADER_TYPE:
Button expandButton = viewHolder.itemView.findViewById(R.id.button);
expandButton.setText(R.string.expand_all);
expandButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
expandedAll = true;
collapsedAll = false;
notifyDataSetChanged();
}
});
break;
case HEADER_TYPE_2:
Button collapseButton = viewHolder.itemView.findViewById(R.id.button);
collapseButton.setText(R.string.collapse_all);
collapseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
expandedAll = false;
collapsedAll = true;
notifyDataSetChanged();
}
});
break;
case INTRO_TYPE:
TextView tvIntroA = viewHolder.itemView.findViewById(R.id.tv_placeholder;
tvIntroA.setVisibility(View.GONE);
break;
case ITEM_TYPE:
// get the current item
CharSequence itemA = dataTitle.get(position - 3);
String itemB = dataSubtitle.get(position - 3);
String itemC = dataDescription.get(position - 3);
//
final TextView txtTitle = viewHolder.itemView.findViewById(R.id.tv_title);
txtTitle.setText(itemA);
final TextView txtSubtitle = viewHolder.itemView.findViewById(R.id.tv_subtitle);
txtSubtitle.setText(itemB);
final TextView txtDescription = viewHolder.itemView.findViewById(R.id.tv_description);
txtDescription.setText(itemC);
final TextView txtArrowTV = viewHolder.itemView.findViewById(R.id.tv_expandcollapsearrow);
txtArrowTV.setText(R.string.fa_icon_chevron_down);
txtArrowTV.setTypeface(iconFont);
// final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
rlInformation.setVisibility(View.GONE);
//
CardView cardView = viewHolder.itemView.findViewById(R.id.cardview_item);
LinearLayout mLinearLayoutTV = viewHolder.itemView.findViewById(R.id.cardview_titlerow);
//
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rlInformation.getVisibility() == View.GONE) {
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
mLinearLayoutTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rlInformation.getVisibility() == View.GONE) {
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
txtArrowTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rlInformation.getVisibility() == View.GONE) {
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
if (expandedAll) {
expandRL(rlInformation, txtArrowTV);
} else if (collapsedAll) {
collapseRL(rlInformation, txtArrowTV);
}
break;
}
}
@Override
public int getItemCount() {
return dataTitle.size() + 3;
}
@Override
public int getItemViewType(int position) {
switch (position) {
case 0:
return HEADER_TYPE;
case 1:
return HEADER_TYPE_2;
case 2:
return INTRO_TYPE;
default:
return ITEM_TYPE;
}
}
private View inflateHelper(Context context, int resId, ViewGroup parent) {
return LayoutInflater.from(context).inflate(resId, parent, false);
}
}
以上解决方案解决了展开和折叠所有问题，但另一个问题仍然存在。您应该为每个项目维护一个 boolean 以显示该项目已折叠或展开。
我已经在名为 PrimeAdapter 的开源库中处理了 RecyclerView 项的扩展。 （它有 android java 示例应用程序）如果你喜欢，我建议你使用它。它使您的代码变得如此简单。
我试图在单击特定按钮时显示或隐藏我的 RecyclerView 项目，但由于某种原因没有任何反应。我什至尝试使用 adapter.notifyDataSetChanged();。需要修复什么，以便当必要的按钮（全部展开 或 全部折叠）出现时，此 RecyclerView 中的所有项目都变得可见或消失点击了吗？
public class MyFragment extends android.support.v4.app.Fragment {
private static final String TAG = MyActivity.class.getSimpleName();
public Boolean isSupposedToBeCollapsed;
private static final int ITEM_TYPE = 100;
private static final int HEADER_TYPE = 101;
private static final int HEADER_TYPE_2 = 102;
private static final int INTRO_TYPE = 103;
public MyFragment() {}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_rv, container, false);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
View v = getView();
assert v != null;
recyclerView = v.findViewById(R.id.my_recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
// SpannableStrings
int[] attrS = {R.attr.spannablestringtextColor};
TypedArray ta = getActivity().getTheme().obtainStyledAttributes(attrS);
int colorSS = ta.getColor(0, Color.BLACK); //Color.BLACK - default value (colour will change automatically depending on chosen theme)
Log.d(TAG, "clickMethod 1) " + Integer.toHexString(colorSS));
ta.recycle();
// SpannableString (start)
SpannableStringBuilder ssb1 = new SpannableStringBuilder();
SpannableString str1a = new SpannableString(getString(R.string.placeholder1_placeholder2_placeholder3,
" ", getString(R.string.title_1a), " "));
str1a.setSpan(new BackgroundColorSpan(Color.BLACK), 0, str1a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
str1a.setSpan(new ForegroundColorSpan(ContextCompat.getColor(getContext(), R.color.yellow)), 0, str1a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb1.append(str1a);
SpannableString str1b = new SpannableString(" " + getString(R.string.title_1b));
str1b.setSpan(new ForegroundColorSpan(colorSS), 0, str1b.length(), 0);
ssb1.append(str1b);
// SpannableString (end)
// SpannableString (start)
SpannableStringBuilder ssb2 = new SpannableStringBuilder();
SpannableString str2a = new SpannableString(getString(R.string.title_2a));
str2a.setSpan(new BackgroundColorSpan(Color.BLACK), 0, str2a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
str2a.setSpan(new ForegroundColorSpan(ContextCompat.getColor(getContext(), R.color.yellow)), 0, str2a.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
ssb2.append(str2a);
SpannableString str2b = new SpannableString(", " + getString(R.string.title_2b));
str2b.setSpan(new ForegroundColorSpan(colorSS), 0, str2b.length(), 0);
ssb2.append(str2b);
// SpannableString (end)
// init data
dataTitle = new ArrayList<>();
dataTitle.add(ssb1);
dataTitle.add(ssb2);
dataTitle.add(getString(R.string.title_c));
dataTitle.add(getString(R.string.title_d));
dataSubtitle = new ArrayList<>();
dataSubtitle.add(getString(R.string.subtitle_a));
dataSubtitle.add(getString(R.string.subtitle_b));
dataSubtitle.add(getString(R.string.subtitle_c));
dataSubtitle.add(getString(R.string.subtitle_d));
dataDescription = new ArrayList<>();
dataDescription.add(getString(R.string.description_a));
dataDescription.add(getString(R.string.description_b));
dataDescription.add(getString(R.string.description_c));
dataDescription.add(getString(R.string.description_d));
adapter = createAdapter();
recyclerView.setAdapter(adapter);
super.onActivityCreated(savedInstanceState);
}
RecyclerView recyclerView;
ArrayList<CharSequence> dataTitle;
ArrayList<String> dataSubtitle;
ArrayList<String> dataDescription;
RecyclerView.Adapter<MyFragment.ViewHolder> adapter;
// creates the adapter
private RecyclerView.Adapter<MyFragment.ViewHolder> createAdapter() {
return new RecyclerView.Adapter<TabFragmentWATTerminus.ViewHolder>() {
public Boolean expandedAll;
public Boolean collapsedAll;
@NonNull
@Override
public MyFragment.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int type) {
switch (type) {
case HEADER_TYPE:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_header, parent));
case HEADER_TYPE_2:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_header, parent));
case ITEM_TYPE:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_item_tv_itemtype, parent));
case INTRO_TYPE:
return new MyFragment.ViewHolder(inflateHelper(R.layout.recyclerview_item_tv_intro, parent));
default:
return new TabFragmentWATTerminus.ViewHolder(inflateHelper(R.layout.recyclerview_item_tv_itemtype, parent));
}
}
@Override
public void onBindViewHolder(@NonNull final MyFragment.ViewHolder viewHolder, int position) {
final Typeface iconFont = FontManager.getTypeface(getContext(), FontManager.FONTAWESOME);
final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
switch (getItemViewType(position)) {
case HEADER_TYPE:
Button expandButton = viewHolder.itemView.findViewById(R.id.button);
expandButton.setText(R.string.expand_all);
expandButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(expandedAll){
expandedAll = true;
expandRL(rlInformation, txtArrowTV);
adapter.notifyDataSetChanged();
} else if(collapsedAll){
collapsedAll = true;
collapseRL(rlInformation, txtArrowTV);
adapter.notifyDataSetChanged();
}
}
});
break;
case HEADER_TYPE_2:
Button collapseButton = viewHolder.itemView.findViewById(R.id.button);
collapseButton.setText(R.string.collapse_all);
collapseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.VISIBLE){ collapseRL(rlInformation, txtArrowTV);
adapter.notifyDataSetChanged();
}
});
break;
case INTRO_TYPE:
TextView tvIntroA = viewHolder.itemView.findViewById(R.id.tv_placeholder;
tvIntroA.setVisibility(View.GONE);
break;
case ITEM_TYPE:
// get the current item
CharSequence itemA = dataTitle.get(position - 3);
String itemB = dataSubtitle.get(position - 3);
String itemC = dataDescription.get(position - 3);
//
final TextView txtTitle = viewHolder.itemView.findViewById(R.id.tv_title);
txtTitle.setText(itemA);
final TextView txtSubtitle = viewHolder.itemView.findViewById(R.id.tv_subtitle);
txtSubtitle.setText(itemB);
final TextView txtDescription = viewHolder.itemView.findViewById(R.id.tv_description);
txtDescription.setText(itemC);
final TextView txtArrowTV = viewHolder.itemView.findViewById(R.id.tv_expandcollapsearrow);
txtArrowTV.setText(R.string.fa_icon_chevron_down);
txtArrowTV.setTypeface(iconFont);
// final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
rlInformation.setVisibility(View.GONE);
//
CardView cardView = viewHolder.itemView.findViewById(R.id.cardview_item);
LinearLayout mLinearLayoutTV = viewHolder.itemView.findViewById(R.id.cardview_titlerow);
//
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.GONE){
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
mLinearLayoutTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.GONE){
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
txtArrowTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rlInformation.getVisibility() == View.GONE){
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
break;
}
}
@Override
public int getItemCount() {
return dataTitle.size() + 3;
}
@Override
public int getItemViewType(int position) {
switch (position) {
case 0:
return HEADER_TYPE;
case 1:
return HEADER_TYPE_2;
case 2:
return INTRO_TYPE;
default: return ITEM_TYPE;
}
}
};
}
private View inflateHelper(int resId, ViewGroup parent) {
return LayoutInflater.from(getActivity()).inflate(resId, parent, false);
}
// inner class for viewholder to use,
class ViewHolder extends RecyclerView.ViewHolder {
ViewHolder(@NonNull View itemView) {
super(itemView);
}
}
public void expandRL(final RelativeLayout rlInformation, final TextView txtArrowTV) {
rlInformation.setVisibility(View.VISIBLE);
txtArrowTV.setText(R.string.fa_icon_chevron_up);
}
public void collapseRL(final RelativeLayout rlInformation, final TextView txtArrowTV) {
rlInformation.setVisibility(View.GONE);
txtArrowTV.setText(R.string.fa_icon_chevron_down);
}
}
编辑答案中的代码有点困难，因为大括号不是成对的。无论如何，您应该在适配器 class 中定义两个 boolean 字段（例如 expandedAll 和 collapsedAll）。在 collapseButton 和 expandButton 的点击侦听器中，为 expandedAll 和 collapsedAll 设置正确的值，然后调用 notifyDataSetChanged()。之后在 onBindViewHolder 中，当视图类型为 ITEM_TYPE 时，检查 expandedAll 和 collapsedAll 的值：
在我的片段中：
private RecyclerView.Adapter<MyFragment.ViewHolder> createAdapter() {
return new MyAdapter(dataTitle, dataSubtitle, dataDescription);
}
MyAdapter.java:
public class MyAdapter extends RecyclerView.Adapter<MyFragment.ViewHolder> {
public static final int ITEM_TYPE = 100;
public static final int HEADER_TYPE = 101;
public static final int HEADER_TYPE_2 = 102;
public static final int INTRO_TYPE = 103;
private ArrayList<CharSequence> dataTitle;
private ArrayList<String> dataSubtitle;
private ArrayList<String> dataDescription;
private Boolean expandedAll;
private Boolean collapsedAll;
public MyAdapter(ArrayList<CharSequence> dataTitle, ArrayList<String> dataSubtitle, ArrayList<String> dataDescription) {
this.dataTitle = dataTitle;
this.dataSubtitle = dataSubtitle;
this.dataDescription = dataDescription;
}
@NonNull
@Override
public MyFragment.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int type) {
switch (type) {
case HEADER_TYPE:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_header, parent));
case HEADER_TYPE_2:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_header, parent));
case ITEM_TYPE:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_item_tv_itemtype, parent));
case INTRO_TYPE:
return new MyFragment.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_item_tv_intro, parent));
default:
return new TabFragmentWATTerminus.ViewHolder(inflateHelper(parent.getContext(), R.layout.recyclerview_item_tv_itemtype, parent));
}
}
@Override
public void onBindViewHolder(@NonNull MyFragment.ViewHolder viewHolder, int position) {
final Typeface iconFont = FontManager.getTypeface(getContext(), FontManager.FONTAWESOME);
final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
switch (getItemViewType(position)) {
case HEADER_TYPE:
Button expandButton = viewHolder.itemView.findViewById(R.id.button);
expandButton.setText(R.string.expand_all);
expandButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
expandedAll = true;
collapsedAll = false;
notifyDataSetChanged();
}
});
break;
case HEADER_TYPE_2:
Button collapseButton = viewHolder.itemView.findViewById(R.id.button);
collapseButton.setText(R.string.collapse_all);
collapseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
expandedAll = false;
collapsedAll = true;
notifyDataSetChanged();
}
});
break;
case INTRO_TYPE:
TextView tvIntroA = viewHolder.itemView.findViewById(R.id.tv_placeholder;
tvIntroA.setVisibility(View.GONE);
break;
case ITEM_TYPE:
// get the current item
CharSequence itemA = dataTitle.get(position - 3);
String itemB = dataSubtitle.get(position - 3);
String itemC = dataDescription.get(position - 3);
//
final TextView txtTitle = viewHolder.itemView.findViewById(R.id.tv_title);
txtTitle.setText(itemA);
final TextView txtSubtitle = viewHolder.itemView.findViewById(R.id.tv_subtitle);
txtSubtitle.setText(itemB);
final TextView txtDescription = viewHolder.itemView.findViewById(R.id.tv_description);
txtDescription.setText(itemC);
final TextView txtArrowTV = viewHolder.itemView.findViewById(R.id.tv_expandcollapsearrow);
txtArrowTV.setText(R.string.fa_icon_chevron_down);
txtArrowTV.setTypeface(iconFont);
// final RelativeLayout rlInformation = viewHolder.itemView.findViewById(R.id.rl_information);
rlInformation.setVisibility(View.GONE);
//
CardView cardView = viewHolder.itemView.findViewById(R.id.cardview_item);
LinearLayout mLinearLayoutTV = viewHolder.itemView.findViewById(R.id.cardview_titlerow);
//
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rlInformation.getVisibility() == View.GONE) {
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
mLinearLayoutTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rlInformation.getVisibility() == View.GONE) {
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
txtArrowTV.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (rlInformation.getVisibility() == View.GONE) {
expandRL(rlInformation, txtArrowTV);
} else {
collapseRL(rlInformation, txtArrowTV);
}
}
});
if (expandedAll) {
expandRL(rlInformation, txtArrowTV);
} else if (collapsedAll) {
collapseRL(rlInformation, txtArrowTV);
}
break;
}
}
@Override
public int getItemCount() {
return dataTitle.size() + 3;
}
@Override
public int getItemViewType(int position) {
switch (position) {
case 0:
return HEADER_TYPE;
case 1:
return HEADER_TYPE_2;
case 2:
return INTRO_TYPE;
default:
return ITEM_TYPE;
}
}
private View inflateHelper(Context context, int resId, ViewGroup parent) {
return LayoutInflater.from(context).inflate(resId, parent, false);
}
}
以上解决方案解决了展开和折叠所有问题，但另一个问题仍然存在。您应该为每个项目维护一个 boolean 以显示该项目已折叠或展开。
我已经在名为 PrimeAdapter 的开源库中处理了 RecyclerView 项的扩展。 （它有 android java 示例应用程序）如果你喜欢，我建议你使用它。它使您的代码变得如此简单。