我正在谈论的活动必须显示由CardViews填充的RecyclerView作为项目.我的目标是在每个CardView中显示一个RecyclerView.
这里我的Activity的基本的xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ConjActivity" >
<android.support.v7.widget.RecyclerView
android:id="@+id/conjCardList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="false" />
</LinearLayout>
这里是我的CardView的RecyclerView的布局：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_analysis"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:padding="5dp"
card_view:cardCornerRadius="5dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v7.widget.RecyclerView
android:id="@+id/item_mode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingLeft="@dimen/activity_horizontal_margin" >
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.v7.widget.CardView>
所以,我大胆地做了我的第一次尝试,实现两个RecyclerView.Adapters,一个(我们称之为)“主要”RecyclerView,一个在每个CardView中单个：
以下是两段代码：
“主”RecyclerView(w / ViewHolders)：
public class ConjCardAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
private static Context context;
private LinearLayoutManager llm;
private static ConjFormAdapter formAdapt;
private ArrayList<String> adapterList;
private List<Object> items;
private static final int
HEADER = 0,CONJTYPE = 1,ITEM = 2;
private Paradigma par;
private String sel_vb;
public ConjCardAdapter(List<Object> items){
this.items = items;
context = ConjActivity.context;
adapterList = new ArrayList<String>();
formAdapt = new ConjFormAdapter(adapterList);
}
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup,int viewType){
switch(viewType){
case HEADER:
return new HeaderHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_header,viewGroup,false));
case CONJTYPE:
return new ConjTypeHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_conjtext,false));
case ITEM:
return new ItemModeHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_item,false));
default:
return null;
}
}
public void onBindViewHolder(RecyclerView.ViewHolder vvh,final int pos) {
HeaderItem headerItem;
String stringItem;
ArrayList<String> listItem;
HeaderHolder hh;
ConjTypeHolder cjh;
ItemModeHolder imh;
switch(getItemViewType(pos)){
case HEADER:
// it doesn't really matter...
break;
case CONJTYPE:
// it doesn't really matter...
break;
case ITEM:
listItem = (ArrayList<String>) items.get(pos);
imh = (ItemModeHolder) vvh;
llm = new LinearLayoutManager(context);
imh.rv_mode.setLayoutManager(llm);
adapterList.addAll(listItem);
imh.rv_mode.setAdapter(formAdapt);
formAdapt.notifyDataSetChanged();
break;
}
}
@Override
public int getItemCount() {
return items.size();
}
@Override
public int getItemViewType(int position) {
switch(position){
case 0:
return HEADER;
case 1:
return CONJTYPE;
default:
return ITEM;
}
}
static class HeaderHolder extends RecyclerView.ViewHolder{
TextView verbo,paradigma,analisi;
View divider;
public HeaderHolder(View itemView) {
super(itemView);
verbo = (TextView) itemView.findViewById(R.id.verb);
paradigma = (TextView) itemView.findViewById(R.id.paradigm);
analisi = (TextView) itemView.findViewById(R.id.analysis);
divider = (View) itemView.findViewById(R.id.divider);
}
}
static class ConjTypeHolder extends RecyclerView.ViewHolder{
TextView type;
public ConjTypeHolder(View itemView) {
super(itemView);
type = (TextView) itemView.findViewById(R.id.conj_type);
}
}
:
static class ItemModeHolder extends RecyclerView.ViewHolder{
RecyclerView rv_mode;
public ItemModeHolder(View itemView) {
super(itemView);
rv_mode = (RecyclerView) itemView.findViewById(R.id.item_mode);
}
}
}
项目RecyclerView(w / ViewHolder)：
public class ConjFormAdapter extends RecyclerView.Adapter<ConjFormAdapter.FormHolder>{
private Context context;
private ArrayList<String> list;
private Paradigma par;
private String sel_vb;
private ArrayList<Long> ids;
private HashMap<String,Long> mIdMap;
private StringAnalisi analisi;
private final int IND_MODE_TYPE=0,ELSE_MODE_TYPE=1,TENSE_TYPE=2,FORM_TYPE=3;
public ConjFormAdapter(ArrayList<String> list){
this.list = list;
// Constructor implementation
}
// other methods
@Override
public FormHolder onCreateViewHolder(ViewGroup viewGroup,int itemType) {
switch(itemType){
case IND_MODE_TYPE:
return new FormHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_mode_ind,false));
case ELSE_MODE_TYPE:
return new FormHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_mode_else,false));
case TENSE_TYPE:
return new FormHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_tense,false));
default:
return new FormHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_form,false));
}
}
@Override
public void onBindViewHolder(FormHolder fh,int pos) {
fh.txt.setText(list.get(pos));
// other implementation
}
@Override
public int getItemCount() {
return list.size();
}
@Override
public int getItemViewType(int position) {
String item = (String) list.get(position);
if(item.equals(context.getResources().getString(R.string.ind))){
return IND_MODE_TYPE;
} else if(item.equals(context.getResources().getString(R.string.subj))||item.equals(context.getResources().getString(R.string.imp))||item.equals(context.getResources().getString(R.string.inf))||item.equals(context.getResources().getString(R.string.pt))||item.equals(context.getResources().getString(R.string.ger))||item.equals(context.getResources().getString(R.string.gerv))||item.equals(context.getResources().getString(R.string.sup))){
return ELSE_MODE_TYPE;
} else if(item.equals(context.getResources().getString(R.string.pres))||item.equals(context.getResources().getString(R.string.impf))||item.equals(context.getResources().getString(R.string.fut))||item.equals(context.getResources().getString(R.string.pf))||item.equals(context.getResources().getString(R.string.ppf))||item.equals(context.getResources().getString(R.string.futant))){
return TENSE_TYPE;
} else {
return FORM_TYPE;
}
}
@Override
public long getItemId(int position) {
String item = list.get(position);
return mIdMap.get(item);
}
@Override
public void setHasStableIds(boolean hasStableIds) {
super.setHasStableIds(true);
}
static class FormHolder extends RecyclerView.ViewHolder{
TextView txt;
View divider1,divider2,divider3;
public FormHolder(View itemView) {
super(itemView);
txt = (TextView) itemView.findViewById(R.id.text1);
divider1 = (View) itemView.findViewById(R.id.conj_divider1);
divider2 = (View) itemView.findViewById(R.id.conj_divider2);
divider3 = (View) itemView.findViewById(R.id.conj_divider3);
}
}
}
正如你所看到的,我认为在第一个实例化第二个适配器是正确的,并且每个项目的RecyclerView附加一个新的LayoutManager并设置第二个适配器是对的.但是,您可以看到我的“主要”Rec.View的前两个项目不包含另一个Rec.View工作,但其他的没有.
如何解决问题？请,我没有想法.
解决方法
我面对完全一样的问题.您必须在CardView中指定RecyclerView的布局高度.将其从wrap_content更改为dp中的特定值.如果父滚动为VERTICAL,则Nested RecyclerView不会包含其高度的内容,同样在父滚动为HORIZONTAL时也不会将内容包含在宽度上.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/card_analysis"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:padding="5dp"
card_view:cardCornerRadius="5dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v7.widget.RecyclerView
android:id="@+id/item_mode"
android:layout_width="wrap_content"
android:layout_height="100dp"
android:paddingTop="5dp"
android:paddingLeft="@dimen/activity_horizontal_margin" >
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.v7.widget.CardView>
