我有一个自定义视图，该视图具有setHeadingString()方法来动态设置其标题。我在RecyclerView中添加了其中几个视图，但是当我想在它们上使用setHeadingString()时，标题不会出现在应用程序中。
为了检查setHeadingString()方法是否真的有效，我只是向布局中添加了一个新视图（通过XML和代码），并在其上使用了此方法。有效。
我的自定义视图名为AccordionView（而AccordionItem是我使用的另一个视图，但是请不要注意它）。
这是我的适配器：
public class AllWorksAdapter extends RecyclerView.Adapter<AllWorksAdapter.ViewHolder> {
private List<AccordionView> items;
RecyclerView.RecycledViewPool viewPool;
Context mContext;
public AllWorksAdapter(List<AccordionView> dataset, Context context) {
items = dataset;
viewPool = new RecyclerView.RecycledViewPool();
mContext = context;
}
public AllWorksAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View accordion = inflater.inflate(R.layout.item_accordion, parent, false);
ViewHolder viewHolder = new ViewHolder(accordion);
viewHolder.recyclerView.setRecycledViewPool(viewPool);
return viewHolder;
}
@Override
public void onBindViewHolder(AllWorksAdapter.ViewHolder viewHolder, int position) {
AccordionView accordion = items.get(position);
AccordionView accordionView = viewHolder.accordionView;
RecyclerView recyclerView = viewHolder.recyclerView;
}
@Override
public int getItemCount() {
return items.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
AccordionView accordionView;
RecyclerView recyclerView;
TextView heading;
ViewHolder(final View itemView) {
super(itemView);
accordionView = itemView.findViewById(R.id.accordionView);
recyclerView = (RecyclerView) itemView.findViewById(R.id.recyclerView);
heading = accordionView.findViewById(R.id.heading);
}
}
public AccordionView getItem(int position) {
return items.get(position);
}
}
item_accordion.xml：
<com.app.myapp.views.AccordionView.AccordionView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/accordionView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="1dp"
app:bodyBackgroundColor="@color/colorPrimaryDark"
app:headingBackground="@drawable/accordion_heading"
app:headingTextSize="7sp"
app:isAnimated="true"
app:isPartitioned="false">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginEnd="8dp">
</android.support.v7.widget.RecyclerView>
<com.app.myapp.views.AccordionItem
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginEnd="8dp"
app:title="Title">
</com.app.myapp.views.AccordionItem>
</com.app.myapp.views.AccordionView.AccordionView>
这就是我将其添加到片段进行测试的方式：
private RecyclerView recyclerView;
ArrayList<AccordionView> items;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_all_works, container, false);
recyclerView = view.findViewById(R.id.container);
items = new ArrayList<>();
//Tried using different contexts
AccordionView a1 = new AccordionView(getActivity());
AccordionView a2 = new AccordionView(getActivity());
AccordionView a3 = new AccordionView(getContext());
AccordionView a4 = new AccordionView(getContext());
a1.setHeadingString("Heading 1");
a2.setHeadingString("Heading 2");
a3.setHeadingString("Heading 3");
a4.setHeadingString("Heading 4");
try {
items.add(a1);
items.add(a2);
items.add(a3);
items.add(a4);
} catch (Exception e) {
e.printStackTrace();
}
AllWorksAdapter adapter = new AllWorksAdapter(items, getActivity());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
return view;
}
我希望通过调用
setHeadingString()可以更改RecyclerView中的视图。我做错了什么？谢谢。
更新资料
通过请求AccordionView类：
public class AccordionView extends RelativeLayout {
View[] children;
Boolean isExpanded = false;
Boolean isAnimated = false;
Boolean isPartitioned = false;
String headingString;
View partition;
TextView heading;
ImageView icon;
RelativeLayout paragraph;
int headingTextSize;
ImageView dropdownImage;
ImageView dropupImage;
private LayoutInflater inflater;
ConstraintLayout headingLayout;
int paragraphTopMargin;
int paragraphBottomMargin;
// int paragraphHeight;
int headingBackgroundColor = Color.WHITE;
int paragraphBackgroundColor = Color.WHITE;
Drawable headingBackground;
Drawable paragraphBackground;
AccordionOnExpansionCollapseListener listener;
Context mContext;
public AccordionView(Context context) {
super(context);
mContext = context;
prepareLayoutWithoutChildren(context);
}
public AccordionView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
handleAttributeSet(context, attrs);
}
public AccordionView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mContext = context;
handleAttributeSet(context, attrs);
}
private void handleAttributeSet(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AccordionView);
isAnimated = a.getBoolean(R.styleable.AccordionView_isAnimated, false);
isPartitioned = a.getBoolean(R.styleable.AccordionView_isPartitioned, false);
headingString = a.getString(R.styleable.AccordionView_heading);
isExpanded = a.getBoolean(R.styleable.AccordionView_isExpanded, false);
headingTextSize = a.getDimensionPixelSize(R.styleable.AccordionView_headingTextSize, 20);
headingBackgroundColor = a.getColor(R.styleable.AccordionView_headingBackgroundColor,Color.WHITE);
paragraphBackgroundColor = a.getColor(R.styleable.AccordionView_bodyBackgroundColor,Color.WHITE);
headingBackground = a.getDrawable(R.styleable.AccordionView_headingBackground);
paragraphBackground = a.getDrawable(R.styleable.AccordionView_bodyBackground);
}
private void initializeViewWithoutChildren(Context context) {
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout accordionLayout = (LinearLayout) inflater.inflate(R.layout.accordion, null);
partition = accordionLayout.findViewById(R.id.partition);
heading = (TextView) accordionLayout.findViewById(R.id.heading);
paragraph = (RelativeLayout) accordionLayout.findViewById(R.id.paragraph_layout);
dropdownImage = (ImageView) accordionLayout.findViewById(R.id.dropdown_image);
dropupImage = (ImageView) accordionLayout.findViewById(R.id.dropup_image);
headingLayout = accordionLayout.findViewById(R.id.heading_layout);
icon = accordionLayout.findViewById(R.id.icon);
paragraph.removeAllViews();
removeAllViews();
paragraphBottomMargin = ((LinearLayout.LayoutParams) paragraph.getLayoutParams()).bottomMargin;
paragraphTopMargin = ((LinearLayout.LayoutParams) paragraph.getLayoutParams()).topMargin;
addView(accordionLayout);
}
private void initializeViews(Context context) {
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout accordionLayout = (LinearLayout) inflater.inflate(R.layout.accordion, null);
partition = accordionLayout.findViewById(R.id.partition);
heading = (TextView) accordionLayout.findViewById(R.id.heading);
paragraph = (RelativeLayout) accordionLayout.findViewById(R.id.paragraph_layout);
dropdownImage = (ImageView) accordionLayout.findViewById(R.id.dropdown_image);
dropupImage = (ImageView) accordionLayout.findViewById(R.id.dropup_image);
headingLayout = accordionLayout.findViewById(R.id.heading_layout);
icon = accordionLayout.findViewById(R.id.icon);
paragraph.removeAllViews();
int i;
children = new View[getChildCount()];
for (i = 0; i < getChildCount(); i++) {
children[i] = getChildAt(i);
}
removeAllViews();
for (i = 0; i < children.length; i++) {
paragraph.addView(children[i]);
}
paragraphBottomMargin = ((LinearLayout.LayoutParams) paragraph.getLayoutParams()).bottomMargin;
paragraphTopMargin = ((LinearLayout.LayoutParams) paragraph.getLayoutParams()).topMargin;
addView(accordionLayout);
}
private void prepareLayout(Context context) {
initializeViews(context);
partition.setVisibility(isPartitioned ? VISIBLE : INVISIBLE);
heading.setText(headingString);
heading.setTextSize(headingTextSize);
//Set the background on the heading...if the background drawable has been set by the user, use that. Else, set the background color
if(!WidgetHelper.isNullOrBlank(headingBackground) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
headingLayout.setBackground(headingBackground);
else
headingLayout.setBackgroundColor(headingBackgroundColor);
//Set the background on the paragraph...if the background drawable has been set by the user, use that. Else, set the background color
if(!WidgetHelper.isNullOrBlank(paragraphBackground) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
paragraph.setBackground(paragraphBackground);
else
paragraph.setBackgroundColor(paragraphBackgroundColor);
paragraph.setVisibility(VISIBLE);
//paragraph.getViewTreeObserver().addOnGlobalLayoutListener(globalLayoutListener);
if (isAnimated) {
headingLayout.setLayoutTransition(new LayoutTransition());
} else {
headingLayout.setLayoutTransition(null);
}
if (isExpanded)
expand();
else
collapse();
setOnClickListenerOnHeading();
setOnLongClickListenerOnHeading();
}
private void prepareLayoutWithoutChildren(Context context) {
initializeViewWithoutChildren(context);
partition.setVisibility(isPartitioned ? VISIBLE : INVISIBLE);
heading.setText(headingString);
paragraph.setVisibility(VISIBLE);
//paragraph.getViewTreeObserver().addOnGlobalLayoutListener(globalLayoutListener);
if (isAnimated) {
headingLayout.setLayoutTransition(new LayoutTransition());
} else {
headingLayout.setLayoutTransition(null);
}
if (isExpanded)
expand();
else
collapse();
setOnClickListenerOnHeading();
setOnLongClickListenerOnHeading();
}
protected void onFinishInflate() {
prepareLayout(getContext());
super.onFinishInflate();
}
private void expand() {
if (isAnimated) {
AccordionTransitionAnimation expandAnimation = new AccordionTransitionAnimation(paragraph, 300, AccordionTransitionAnimation.EXPAND);
expandAnimation.setHeight(WidgetHelper.getFullHeight(paragraph));
expandAnimation.setEndBottomMargin(paragraphBottomMargin);
expandAnimation.setEndTopMargin(paragraphTopMargin);
paragraph.startAnimation(expandAnimation);
} else {
paragraph.setVisibility(VISIBLE);
}
partition.setVisibility(isPartitioned ? VISIBLE : INVISIBLE);
dropupImage.setVisibility(VISIBLE);
dropdownImage.setVisibility(GONE);
if(!WidgetHelper.isNullOrBlank(listener)) {
listener.onExpanded(this);
}
}
private void collapse() {
if (isAnimated) {
AccordionTransitionAnimation collapseAnimation = new AccordionTransitionAnimation(paragraph, 300, AccordionTransitionAnimation.COLLAPSE);
paragraph.startAnimation(collapseAnimation);
} else {
paragraph.setVisibility(GONE);
}
partition.setVisibility(INVISIBLE);
dropupImage.setVisibility(GONE);
dropdownImage.setVisibility(VISIBLE);
if(!WidgetHelper.isNullOrBlank(listener)) {
listener.onCollapsed(this);
}
}
private void setOnClickListenerOnHeading() {
heading.setOnClickListener(toggleParagraphVisiblity);
dropdownImage.setOnClickListener(toggleParagraphVisiblity);
dropupImage.setOnClickListener(toggleParagraphVisiblity);
icon.setOnClickListener(toggleParagraphVisiblity);
headingLayout.setOnClickListener(toggleParagraphVisiblity);
}
OnClickListener toggleParagraphVisiblity = new OnClickListener() {
@Override
public void onClick(View view) {
if (paragraph.getVisibility() == VISIBLE) {
collapse();
} else
expand();
}
};
private void setOnLongClickListenerOnHeading() {
headingLayout.setOnLongClickListener(longClickListener);
heading.setOnLongClickListener(longClickListener);
dropdownImage.setOnLongClickListener(longClickListener);
dropupImage.setOnLongClickListener(longClickListener);
icon.setOnLongClickListener(longClickListener);
}
OnLongClickListener longClickListener = new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
MainActivity mainActivity = (MainActivity) mContext;
mainActivity.showActionsOnFileFragment(headingString, 2);
return false;
}
};
public void addViewToBody(View child) {
paragraph.addView(child);
}
public void setHeadingString(String headingString) {
this.headingString = headingString;
heading.setText(headingString);
}
public Boolean getAnimated() {
return isAnimated;
}
public void setAnimated(Boolean animated) {
isAnimated = animated;
}
public void setOnExpandCollapseListener(AccordionOnExpansionCollapseListener listener) {
this.listener = listener;
}
public RelativeLayout getBody() {
return paragraph;
}
public RelativeLayout getParagraph() {
return paragraph;
}
public Boolean getExpanded() {
return isExpanded;
}
public void setExpanded(Boolean expanded) {
isExpanded = expanded;
}
public Boolean getPartitioned() {
return isPartitioned;
}
public String getHeadingString() { return headingString; }
public void setPartitioned(Boolean partitioned) {
isPartitioned = partitioned;
partition.setVisibility(isPartitioned ? VISIBLE : INVISIBLE);
}
public void setHeadingBackGround(Drawable drawable) {
if(WidgetHelper.isNullOrBlank(headingLayout))
headingLayout = findViewById(R.id.heading_layout);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
headingLayout.setBackground(drawable);
}
}
public void setHeadingBackGround(int resId) {
Drawable drawable = getResources().getDrawable(resId);
if(WidgetHelper.isNullOrBlank(headingLayout))
headingLayout = findViewById(R.id.heading_layout);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
headingLayout.setBackground(drawable);
}
}
public void setBodyBackGround(Drawable drawable) {
if(WidgetHelper.isNullOrBlank(paragraph))
paragraph = (RelativeLayout) findViewById(R.id.paragraph_layout);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
paragraph.setBackground(drawable);
}
}
public void setBodyBackGround(int resId) {
Drawable drawable = getResources().getDrawable(resId);
if(WidgetHelper.isNullOrBlank(paragraph))
paragraph = (RelativeLayout) findViewById(R.id.paragraph_layout);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
paragraph.setBackground(drawable);
}
}
public void setHeadingBackGroundColor(int color) {
if(WidgetHelper.isNullOrBlank(headingLayout))
headingLayout = findViewById(R.id.heading_layout);
headingLayout.setBackgroundColor(color);
}
public void setBodyBackGroundColor(int color) {
if(WidgetHelper.isNullOrBlank(paragraph))
paragraph = (RelativeLayout) findViewById(R.id.paragraph_layout);
paragraph.setBackgroundColor(color);
}
}
最佳答案
在您的Adapter onBindViewHolder方法中，您需要填充自定义视图，然后在此调用“ setHeadingString”方法。喜欢
@Override
public void onBindViewHolder(AllWorksAdapter.ViewHolder viewHolder, int position) {
AccordionView accordion = new AccordionView()// initialization
accordion.setHeadingString(items.get(position).getHeading());
}
最好使用Custom类的Model作为Items列表，而不要使用Custom视图类型。喜欢
private List<YourModelClass> items;
然后只要您需要更改标题，只需在项目列表中更改标题并调用
adapter.notifyDataSetChanged();