如何使用ExpandableRecyclerView库具有多个（孩子）viewTypes？ [英] How to use ExpandableRecyclerView library with multiple (child) viewTypes?
问题描述
我需要像在这张照片可扩展RecyclerView活动：
![在这里输入的形象描述](\"http://i.stack.imgur.com/jS6o0.png\")
所以我使用 这个第三方库项目 。 那部分作品。
的在问题出现：当我做了我所描述在接下来的两个段落：的
我的下一个要求是，我想不同的儿童行针对不同的父行。我复制（如果这是正确的字） 这个例子来创建多个儿童viewholders 。
举例说明：的的想法基本上是有延伸的一个共同的childview持有人不同的儿童viewholders（对应于每个子行样式），然后我们ExpandableRecyclerAdapter在那里我们传递（在SSCCE parentItemList ）的构造显示父行的数据的ArrayList里面，我们声明常数重新presenting所有子行类型（TYPE_EDITTEXT和TYPE_SPINNER在下面的SSCCE）;然后在 getItemViewType（INT位置）我们比较从 parentItemList 数据项使用通过 INT位置为指标，对父母行，并在每一种情况下每个文本字符串，分配 viewType int变量一个类型常量，而 viewType 。然后这个 INT viewType 传递给 onCreateChildViewHolder 和 onBindChildViewHolder ，因此，我们在这些方法的定义执行另一个开关块，然后在onCreateChildViewHolder我们返回一个对应ChildViewHolder（从相应的布局资源充气）（或者 R.layout.custom_row_child_with_edittext 或 R.layout.custom_row_child_with_spinner 在SSCCE）;和在 onBindChildViewHolder ，按照在开关块的情况下更新数据。
的问题是dollowing ClassCastException异常：
07-26 18：21：54.380：E / AndroidRuntime（276）：致命异常：主要
07-26 18：21：54.380：E / AndroidRuntime（276）：java.lang.ClassCastException：tests.test.epmc_mobile.search_module.no_ui.expandable_recycler_view.EPMCChildViewHolder
07-26 18：21：54.380：E / AndroidRuntime（276）：在com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter.onBindViewHolder(ExpandableRecyclerAdapter.java:144)
问题是，<一个href=\"https://github.com/bignerdranch/expandable-recycler-view/blob/master/expandablerecyclerview/src/main/java/com/bignerdranch/expandablerecyclerview/Adapter/ExpandableRecyclerAdapter.java\"相对=nofollow> ExpandableRecyclerAdapter.java 是第三方库项目的一部分，并线＃144（与142和143，我加的）是：
Log.i（TAG+++++++++++++++++++++++++ THE RecyclerView的类型。 ViewHolder已作为参数传递IS
+ holder.getClass（）getSimpleName（）+++++++++++++++++++++++++++++）;
PVH parentViewHolder =（PVH）持有人;
在我试图做我上面做什么，它是工作的罚款。
MainActivity.java
公共类MainActivity扩展FragmentActivity {
私有静态最后弦乐TAG = MainActivity.class.getSimpleName（）;
私人RecyclerView recyclerView;
私有静态诠释[] = imageIds {R.drawable.ic_action_call，R.drawable.ic_action_copy，R.drawable.ic_action_discard};
私有静态的String []标题= {虚拟文本一号，虚拟文本二，虚拟文本三};
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
Log.i（TAGMainActivity叫的onCreate。）; //检查
super.onCreate（savedInstanceState）; 的setContentView（R.layout.activity_main）;
recyclerView =（RecyclerView）findViewById（R.id.mainActivity_recyclerView）; MyExpandableRecyclerAdapter myExpandableRecyclerAdapter =新MyExpandableRecyclerAdapter（这一点，populateDataList（本））;
recyclerView.setAdapter（myExpandableRecyclerAdapter）;
recyclerView.setLayoutManager（新LinearLayoutManager（本））;
} 私人的ArrayList＆LT; ParentObject＆GT; populateDataList（上下文的背景下）{
Log.i（TAGMainActivity称为populateDataList。）; //检查
ArrayList的＆LT; ParentObject＆GT; parentObjectList =新的ArrayList＆LT;＆GT;（）;
的for（int i = 0; I＆LT; imageIds.length＆放大器;＆安培; I＆LT; titles.length;我++）{
MyCustomParentObject myCustomParentObject =新MyCustomParentObject（背景）;
myCustomParentObject.setImageId（imageIds [I]）;
myCustomParentObject.setTitle（标题[I]）;
parentObjectList.add（myCustomParentObject）;
}
返回parentObjectList;
}
}
MyExpandableRecyclerAdapter.java
公共类MyExpandableRecyclerAdapter扩展ExpandableRecyclerAdapter＆LT; ParentViewHolder，ChildViewHolder＆GT; {
私有静态最后弦乐TAG = MyExpandableRecyclerAdapter.class.getSimpleName（）;
LayoutInflater layoutInflater;
上下文语境;
私人列表＆LT; ParentObject＆GT; parentItemList =新的ArrayList＆LT;＆GT;（）; 私有静态最终诠释TYPE_EDITTEXT = 0;
私有静态最终诠释TYPE_SPINNER = 1;
公共MyExpandableRecyclerAdapter（上下文的背景下，列表与LT; ParentObject＆GT; parentObjectItemsList）{
超（背景下，parentObjectItemsList）;
Log.i（TAGMyExpandableRecyclerAdapter所谓的构造函数。）; //检查
layoutInflater = LayoutInflater.from（上下文）;
this.context =背景;
parentItemList = parentObjectItemsList;
} @覆盖
公众诠释getItemViewType（INT位置）{
INT viewType;
如果（parentItemList.get（位置）.equals（EditText上输入））{
viewType = TYPE_EDITTEXT;
}其他{
viewType = TYPE_SPINNER;
}
返回viewType;
}
@覆盖
公共MyParentViewHolder onCreateParentViewHolder（ViewGroup中的容器，诠释viewType）{
Log.i（TAGonCreateParentViewHolder MyExpandableRecyclerAdapter叫。）; //检查
Log.i（TAG，在onCreateParentViewHolder，中的项目parentItemList的类型是+ parentItemList.get（1））;
返回新MyParentViewHolder（layoutInflater.inflate（R.layout.custom_row_parent，集装箱，FALSE））;
} @覆盖
公共MyChildViewHolder onCreateChildViewHolder（ViewGroup中的容器，诠释viewType）{
Log.i（TAGonCreateChildViewHolder MyExpandableRecyclerAdapter叫。）; //检查
开关（viewType）{
案例TYPE_EDITTEXT：
返回新MyChildViewHolder（layoutInflater.inflate（R.layout.custom_row_child_with_edittext，集装箱，假的），背景）;
案例TYPE_SPINNER：
返回新MyChildViewHolder（layoutInflater.inflate（R.layout.custom_row_child_with_spinner，集装箱，假的），背景）;
默认：
返回新MyChildViewHolder（layoutInflater.inflate（R.layout.custom_row_child_with_edittext，集装箱，假的），背景）;
}
} @覆盖
公共无效onBindParentViewHolder（ParentViewHolder parentViewHolder，INT位置，对象parentObject）{
Log.i（TAGonBindParentViewHolder MyExpandableRecyclerAdapter叫。）; //检查
MyParentViewHolder myParentViewHolder =（MyParentViewHolder）parentViewHolder;
MyCustomParentObject myCustomParentObject =（MyCustomParentObject）parentObject;
myParentViewHolder.textView.setText（myCustomParentObject.getTitle（））;
myParentViewHolder.imageView.setImageResource（myCustomParentObject.getImageId（））;
} @覆盖
公共无效onBindChildViewHolder（ChildViewHolder childViewHolder，INT位置，对象childObject）{
Log.i（TAGonBindChildViewHolder MyExpandableRecyclerAdapter叫。）; //检查 开关（childViewHolder.getItemViewType（））{
案例TYPE_EDITTEXT：
MyChildViewHolderWithEditText myChildViewHolderWithEditText =（MyChildViewHolderWithEditText）childViewHolder;
myChildViewHolderWithEditText.textView.setText（TextView的+（位置+ 1）+标题）;
案例TYPE_SPINNER：
MyCustomChildObject myCustomChildObject =（MyCustomChildObject）childObject;
ArrayAdapter arrayAdapter =新ArrayAdapter（上下文，android.R.layout.simple_list_item_1，myCustomChildObject.getSpinnerItems（））;
arrayAdapter.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;
MyChildViewHolderWithSpinner myChildViewHolderWithSpinner =（MyChildViewHolderWithSpinner）childViewHolder;
myChildViewHolderWithSpinner.spinner.setAdapter（arrayAdapter）;
}
}}
MyCustomParentObject.java
公共类MyCustomParentObject实现ParentObject {
私有静态最后弦乐TAG = MyCustomParentObject.class.getSimpleName（）;
//列表存储在父对象的所有儿童。
私人列表＆LT;对象＆gt; childObjectList;
私有String []围兜; MyCustomParentObject（上下文的背景下）{
超（）;
围兜= context.getResources（）getStringArray（R.array.spinner_options）。
}
@覆盖
公开名单＆LT;对象＆gt; getChildObjectList（）{
Log.i（TAGMyCustomParentObject称为getChildObjectList。）; //检查
//你可以回到这里的孩子一个新创建的列表或更高附加它们
返回populateChildObjectList（）;
} @覆盖
公共无效setChildObjectList（列表＆LT;对象＆gt; childObjectList）{
Log.i（TAGMyCustomParentObject的setChildObjectList叫。）; //检查
childObjectList = childObjectList;
} 私人列表＆LT;对象＆gt; populateChildObjectList（）{
Log.i（TAGMyCustomParentObject称为populateChildObjectList。）; //检查
childObjectList =新的ArrayList＆LT;＆GT;（）;
MyCustomChildObject myCustomChildObject =新MyCustomChildObject（）;
myCustomChildObject.setSpinnerItems（BIB）;
对象myCustomChildObjectCasted =（对象）myCustomChildObject;
childObjectList.add（myCustomChildObjectCasted）;
返回childObjectList;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
私人诠释imageId;
私人字符串称号;
公众诠释getImageId（）{
Log.i（TAGMyCustomParentObject称为getImageId。）; //检查
返回imageId;
}
公共无效setImageId（INT imageId）{
Log.i（TAGMyCustomParentObject的setImageId叫。）; //检查
this.imageId = imageId;
}
公共字符串的getTitle（）{
Log.i（TAGMyCustomParentObject叫的getTitle。）; //检查
返回称号;
}
公共无效的setTitle（字符串名称）{
Log.i（TAGMyCustomParentObject的所谓的setTitle）; //检查
this.title =称号;
}}
MyCustomChildObject.java
公共类MyCustomChildObject {
私有静态最后弦乐TAG = MyCustomParentObject.class.getSimpleName（）; 私有String [] spinnerItems; 公众的String [] getSpinnerItems（）{
返回spinnerItems;
} 公共无效setSpinnerItems（字符串[] spinnerItems）{
this.spinnerItems = spinnerItems;
}}
MyCustomParentViewHolder.java
公共类MyParentViewHolder扩展ParentViewHolder {
私有静态最后弦乐TAG = MyParentViewHolder.class.getSimpleName（）;
TextView中的TextView;
ImageView的ImageView的; 公共MyParentViewHolder（查看ItemView控件）{
超（ItemView控件）;
Log.i（TAGMyParentViewHolder所谓的构造函数。）; //检查
的TextView =（TextView中）itemView.findViewById（R.id.parentCustomRow_textView）;
ImageView的=（ImageView的）itemView.findViewById（R.id.parentCustomRow_imageView）;
}}
MyCustomChildViewHolder.java
公共类MyChildViewHolder扩展ChildViewHolder {
私有静态最后弦乐TAG = MyChildViewHolder.class.getSimpleName（）; 公共MyChildViewHolder（查看ItemView控件，最终上下文的背景下）{
超（ItemView控件）;
Log.i（TAGMyChildViewHolder所谓的构造函数。）; //检查
}
}
MyCustomChildViewHolderWithEditText.java
公共类MyChildViewHolderWithEditText扩展MyChildViewHolder {
EDITTEXT的EditText;
TextView中的TextView; 公共MyChildViewHolderWithEditText（查看ItemView控件，上下文的背景下）{
超（ItemView控件，背景）; 的TextView =（TextView中）itemView.findViewById（R.id.childViewHolderWithEditText_TextView）;
EDITTEXT =（EditText上）itemView.findViewById（R.id.childViewHolderWithEditText_editText）;
}}
MyCustomChildViewHolderWithSpinner.java
公共类MyChildViewHolderWithSpinner扩展MyChildViewHolder {
微调微调; 公共MyChildViewHolderWithSpinner（查看ItemView控件，上下文的背景下）{
超（ItemView控件，背景）; 微调=（微调）itemView.findViewById（R.id.childViewHolderWithSpinner_spinner）;
// ArrayAdapter＆LT;＆CharSequence的GT;适配器= ArrayAdapter.createFromResource（背景下，R.array.childViewSpinnerFields，android.R.layout.simple_spinner_item）;
//adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item）;
///spinner.setAdapter(adapter）;
spinner.setOnItemSelectedListener（新OnItemSelectedListener（）{
@覆盖
公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{}
@覆盖
公共无效onNothingSelected（适配器视图＆LT;＆GT;母公司）{}
}）;
}}
通过比较这个堆栈跟踪线＃13无错程序和这一项导致异常的程序，并通过查看 onCreateViewHolder（ViewGroup中ViewGroup中，诠释viewType）方法上<定义href=\"https://github.com/bignerdranch/expandable-recycler-view/blob/master/expandablerecyclerview/src/main/java/com/bignerdranch/expandablerecyclerview/Adapter/ExpandableRecyclerAdapter.java\"相对=nofollow>＃线这个 ExpandableRecyclerAdapter.java 类，从中我推断117 onCreateViewHolder 被传递了错误的 viewType 参数。
但我仍未能找出原因！
我觉得我已经想通了。
其实，我用 MyExpandableRecyclerAdapter TYPE_SOMETHING 常量的诀窍是他们在已经使用的同一个 ExpandableRecyclerAdapter ，也就是在我的 MyExpandableRecyclerAdapter ， 0 是值 TYPE_EDITTEXT 和 1 是 TYPE_SPINNER 的价值;而在他们的 ExpandableRecyclerAdapter ，这是我的 MyExpandableRecyclerAdapter ， 0 是价值 TYPE_PARENT 和 1 是 TYPE_CHILD 。
要如果Android框架通过同样的 viewType 参数 onCreateViewHolder 这是从返回getItemViewType（INT位置），它会通过 1 如果是 TYPE_SPINNER 在我的 MyExpandableRecyclerAdapter ，但他们的 ExpandableRecyclerAdapter 将它理解为 TYPE_CHILD ，和因此调用 onCreateChildViewHolder 。
所以我觉得我试图实现整个事情不能做。 =（
I need an Activity with an expandable RecyclerView like the one in this picture:
So I am using this third party library project . That part works.
The problem arose when I did what I am describing in the next two paragraphs:
My next requirement is that I want different child-rows for different parent-rows. I am reproducing (if that's the right word) this example to create multiple child-viewholders.
Description of Example: The idea is basically to have the different Child-viewholders (corresponding to each child-row style) extending one common childview-holder, and then inside our ExpandableRecyclerAdapter where we are passed the ArrayList of the data displayed in parent-rows in the constructor (parentItemList in the SSCCE), we declare constants representing all the child-row-types (TYPE_EDITTEXT and TYPE_SPINNER in the SSCCE below); and then inside getItemViewType(int position) we compare the data item from parentItemList using the passed int position as the index, with each text string on parent-rows and in each case, assign the viewType int variable a TYPE constant, and the viewType.Then this int viewType is passed to the onCreateChildViewHolder and onBindChildViewHolder, so we execute another switch-block in the definitions of each of these methods and then in onCreateChildViewHolder we return a corresponding ChildViewHolder (inflated from a corresponding layout resource) (either R.layout.custom_row_child_with_edittext or R.layout.custom_row_child_with_spinner in the SSCCE) ; and in onBindChildViewHolder, update the data according to the case in the switch-block.
The problem is the dollowing ClassCastException:
07-26 18:21:54.380: E/AndroidRuntime(276): FATAL EXCEPTION: main
07-26 18:21:54.380: E/AndroidRuntime(276): java.lang.ClassCastException: tests.test.epmc_mobile.search_module.no_ui.expandable_recycler_view.EPMCChildViewHolder
07-26 18:21:54.380: E/AndroidRuntime(276): at com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter.onBindViewHolder(ExpandableRecyclerAdapter.java:144)
The thing is that ExpandableRecyclerAdapter.java is a part of the third party library project, and Line#144 (and 142 and 143 which I added) are:
Log.i(TAG, "+++++++++++++++++++++++++THE TYPE OF THE RecyclerView.ViewHolder WHICH HAS BEEN PASSED AS AN ARGUMENT IS "
+ holder.getClass().getSimpleName() + "++++++++++++++++++++++++++++");
PVH parentViewHolder = (PVH) holder;
Before I tried to do what I am doing above, it was working fine.
MainActivity.java
public class MainActivity extends FragmentActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private RecyclerView recyclerView;
private static int [] imageIds = {R.drawable.ic_action_call, R.drawable.ic_action_copy, R.drawable.ic_action_discard};
private static String [] titles = {"Dummy Text One", "Dummy Text Two", "Dummy Text Three"};
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(TAG, "onCreate of MainActivity called.");//check
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.mainActivity_recyclerView);
MyExpandableRecyclerAdapter myExpandableRecyclerAdapter = new MyExpandableRecyclerAdapter(this, populateDataList(this));
recyclerView.setAdapter(myExpandableRecyclerAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
}
private ArrayList<ParentObject> populateDataList(Context context) {
Log.i(TAG, "populateDataList of MainActivity called.");//check
ArrayList<ParentObject> parentObjectList = new ArrayList<>();
for (int i=0; i<imageIds.length && i<titles.length; i++) {
MyCustomParentObject myCustomParentObject = new MyCustomParentObject(context);
myCustomParentObject.setImageId(imageIds[i]);
myCustomParentObject.setTitle(titles[i]);
parentObjectList.add(myCustomParentObject);
}
return parentObjectList;
}
}
MyExpandableRecyclerAdapter.java
public class MyExpandableRecyclerAdapter extends ExpandableRecyclerAdapter<ParentViewHolder, ChildViewHolder> {
private static final String TAG = MyExpandableRecyclerAdapter.class.getSimpleName();
LayoutInflater layoutInflater;
Context context;
private List<ParentObject> parentItemList = new ArrayList<>();
private static final int TYPE_EDITTEXT = 0;
private static final int TYPE_SPINNER = 1;
public MyExpandableRecyclerAdapter(Context context, List<ParentObject> parentObjectItemsList) {
super(context, parentObjectItemsList);
Log.i(TAG, "Constructor of MyExpandableRecyclerAdapter called.");//check
layoutInflater = LayoutInflater.from(context);
this.context = context;
parentItemList = parentObjectItemsList;
}
@Override
public int getItemViewType(int position) {
int viewType;
if (parentItemList.get(position).equals("EditText Entry")) {
viewType = TYPE_EDITTEXT;
} else {
viewType = TYPE_SPINNER;
}
return viewType;
}
@Override
public MyParentViewHolder onCreateParentViewHolder(ViewGroup container, int viewType) {
Log.i(TAG, "onCreateParentViewHolder of MyExpandableRecyclerAdapter called.");//check
Log.i(TAG, "IN onCreateParentViewHolder, THE TYPE OF AN ITEM IN THE parentItemList IS " + parentItemList.get(1));
return new MyParentViewHolder(layoutInflater.inflate(R.layout.custom_row_parent, container, false));
}
@Override
public MyChildViewHolder onCreateChildViewHolder(ViewGroup container, int viewType) {
Log.i(TAG, "onCreateChildViewHolder of MyExpandableRecyclerAdapter called.");//check
switch(viewType) {
case TYPE_EDITTEXT:
return new MyChildViewHolder(layoutInflater.inflate(R.layout.custom_row_child_with_edittext, container, false), context);
case TYPE_SPINNER:
return new MyChildViewHolder(layoutInflater.inflate(R.layout.custom_row_child_with_spinner, container, false), context);
default:
return new MyChildViewHolder(layoutInflater.inflate(R.layout.custom_row_child_with_edittext, container, false), context);
}
}
@Override
public void onBindParentViewHolder(ParentViewHolder parentViewHolder, int position, Object parentObject) {
Log.i(TAG, "onBindParentViewHolder of MyExpandableRecyclerAdapter called.");//check
MyParentViewHolder myParentViewHolder = (MyParentViewHolder) parentViewHolder;
MyCustomParentObject myCustomParentObject = (MyCustomParentObject) parentObject;
myParentViewHolder.textView.setText(myCustomParentObject.getTitle());
myParentViewHolder.imageView.setImageResource(myCustomParentObject.getImageId());
}
@Override
public void onBindChildViewHolder(ChildViewHolder childViewHolder, int position, Object childObject) {
Log.i(TAG, "onBindChildViewHolder of MyExpandableRecyclerAdapter called.");//check
switch(childViewHolder.getItemViewType()) {
case TYPE_EDITTEXT:
MyChildViewHolderWithEditText myChildViewHolderWithEditText = (MyChildViewHolderWithEditText) childViewHolder;
myChildViewHolderWithEditText.textView.setText("TextView " + (position+1) + " Title");
case TYPE_SPINNER:
MyCustomChildObject myCustomChildObject = (MyCustomChildObject) childObject;
ArrayAdapter arrayAdapter = new ArrayAdapter(context, android.R.layout.simple_list_item_1, myCustomChildObject.getSpinnerItems());
arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
MyChildViewHolderWithSpinner myChildViewHolderWithSpinner = (MyChildViewHolderWithSpinner) childViewHolder;
myChildViewHolderWithSpinner.spinner.setAdapter(arrayAdapter);
}
}
}
MyCustomParentObject.java
public class MyCustomParentObject implements ParentObject {
private static final String TAG = MyCustomParentObject.class.getSimpleName();
//List to store all the children of the parent object in.
private List<Object> childObjectList;
private String [] bib;
MyCustomParentObject (Context context) {
super();
bib = context.getResources().getStringArray(R.array.spinner_options);
}
@Override
public List<Object> getChildObjectList() {
Log.i(TAG, "getChildObjectList of MyCustomParentObject called.");//check
//"You can either return a newly created list of children here or attach them later"
return populateChildObjectList();
}
@Override
public void setChildObjectList(List<Object> childObjectList) {
Log.i(TAG, "setChildObjectList of MyCustomParentObject called.");//check
childObjectList = childObjectList;
}
private List<Object> populateChildObjectList() {
Log.i(TAG, "populateChildObjectList of MyCustomParentObject called.");//check
childObjectList = new ArrayList<>();
MyCustomChildObject myCustomChildObject = new MyCustomChildObject();
myCustomChildObject.setSpinnerItems(bib);
Object myCustomChildObjectCasted = (Object) myCustomChildObject;
childObjectList.add(myCustomChildObjectCasted);
return childObjectList;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
private int imageId;
private String title;
public int getImageId() {
Log.i(TAG, "getImageId of MyCustomParentObject called.");//check
return imageId;
}
public void setImageId(int imageId) {
Log.i(TAG, "setImageId of MyCustomParentObject called.");//check
this.imageId = imageId;
}
public String getTitle() {
Log.i(TAG, "getTitle of MyCustomParentObject called.");//check
return title;
}
public void setTitle(String title) {
Log.i(TAG, "setTitle of MyCustomParentObject called.");//check
this.title = title;
}
}
MyCustomChildObject.java
public class MyCustomChildObject {
private static final String TAG = MyCustomParentObject.class.getSimpleName();
private String [] spinnerItems;
public String [] getSpinnerItems() {
return spinnerItems;
}
public void setSpinnerItems(String [] spinnerItems) {
this.spinnerItems = spinnerItems;
}
}
MyCustomParentViewHolder.java
public class MyParentViewHolder extends ParentViewHolder {
private static final String TAG = MyParentViewHolder.class.getSimpleName();
TextView textView;
ImageView imageView;
public MyParentViewHolder(View itemView) {
super(itemView);
Log.i(TAG, "Constructor of MyParentViewHolder called.");//check
textView = (TextView) itemView.findViewById(R.id.parentCustomRow_textView);
imageView = (ImageView) itemView.findViewById(R.id.parentCustomRow_imageView);
}
}
MyCustomChildViewHolder.java
public class MyChildViewHolder extends ChildViewHolder {
private static final String TAG = MyChildViewHolder.class.getSimpleName();
public MyChildViewHolder(View itemView, final Context context) {
super(itemView);
Log.i(TAG, "Constructor of MyChildViewHolder called.");// check
}
}
MyCustomChildViewHolderWithEditText.java
public class MyChildViewHolderWithEditText extends MyChildViewHolder {
EditText editText;
TextView textView;
public MyChildViewHolderWithEditText(View itemView, Context context) {
super(itemView, context);
textView = (TextView) itemView.findViewById(R.id.childViewHolderWithEditText_TextView);
editText = (EditText) itemView.findViewById(R.id.childViewHolderWithEditText_editText);
}
}
MyCustomChildViewHolderWithSpinner.java
public class MyChildViewHolderWithSpinner extends MyChildViewHolder {
Spinner spinner;
public MyChildViewHolderWithSpinner(View itemView, Context context) {
super(itemView, context);
spinner = (Spinner) itemView.findViewById(R.id.childViewHolderWithSpinner_spinner);
//ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(context, R.array.childViewSpinnerFields, android.R.layout.simple_spinner_item);
//adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
///spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {}
@Override
public void onNothingSelected(AdapterView<?> parent) {}
});
}
}
By comparing Line#13 of this stack-trace of the error free program, and this one of the program which results in the exception, and by looking at the onCreateViewHolder(ViewGroup viewGroup, int viewType) method definition on Line#117 of this ExpandableRecyclerAdapter.java class, from which I infer that onCreateViewHolder is being passed the wrong viewType parameter.
But I haven't yet been able to figure out why!
I think I have figured it out.
Actually the trick of TYPE_SOMETHING constants that I am using in MyExpandableRecyclerAdapter is the same one they have used in ExpandableRecyclerAdapter, i.e. in my MyExpandableRecyclerAdapter, 0 is the value of TYPE_EDITTEXT and 1 is the value of TYPE_SPINNER; whereas in their ExpandableRecyclerAdapter, which is extended by my MyExpandableRecyclerAdapter, 0 is the value of TYPE_PARENT and 1 is the value of TYPE_CHILD.
If the Android framework passes the same viewType parameter to onCreateViewHolder which is returned from getItemViewType(int position), it will pass 1 if it was TYPE_SPINNER in my MyExpandableRecyclerAdapter, but their ExpandableRecyclerAdapter will understand it as TYPE_CHILD, and thus call onCreateChildViewHolder.
So I think the whole thing I am trying to achieve can't be done. =(
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