我正在使用可扩展列表视图，当我向下滚动子项的复选框位置变化时，我想在滚动列表视图时保持该位置。
public class ExpandableListAdapterWork extends BaseExpandableListAdapter {
// Define activity context
private Context mContext;
ArrayList<FilterArray> arrfilter;
int offsetvalue = 0, limit = 100, count = 0;
List<String> productList, articleList;
ArrayList productnamelist, articleOptionList;
String ProductName, ArticleOption;
ExpandableListView expandableListView;
private HashMap<String, List<String>> mListDataChild;
// ArrayList that is what each key in the above
// hashmap points to
private ArrayList<String> mListDataGroup;
// Hashmap for keeping track of our checkbox check states
private HashMap<Integer, boolean[]> mChildCheckStates;
private HashMap<Integer, boolean[]> mProductChildCheckStates;
private ChildViewHolder childViewHolder;
private GroupViewHolder groupViewHolder;
private String groupText;
private String childText;
public ExpandableListAdapterWork(Context context, ArrayList<String> listDataGroup, HashMap<String, List<String>> listDataChild, ExpandableListView expandableListView) {
mContext = context;
mListDataGroup = listDataGroup;
mListDataChild = listDataChild;
productList = new ArrayList<String>();
productnamelist = new ArrayList();
arrfilter = new ArrayList<FilterArray>();
this.expandableListView = expandableListView;
articleList = new ArrayList<String>();
articleOptionList = new ArrayList();
// Initialize our hashmap containing our check states here
mChildCheckStates = new HashMap<Integer, boolean[]>();
mProductChildCheckStates = new HashMap<Integer, boolean[]>();
}
public int getNumberOfCheckedItemsInGroup(int mGroupPosition) {
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
int count = 0;
if (getChecked != null) {
for (int j = 0; j < getChecked.length; ++j) {
if (getChecked[j] == true) count++;
}
}
return count;
}
@Override
public int getGroupCount() {
return mListDataGroup.size();
}
@Override
public String getGroup(int groupPosition) {
return mListDataGroup.get(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
groupText = getGroup(groupPosition);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.sfilter_list_group, null);
groupViewHolder = new GroupViewHolder();
groupViewHolder.mGroupText = (TextView) convertView.findViewById(R.id.lblListHeader);
groupViewHolder.mImage = (ImageView) convertView.findViewById(R.id.groupImage);
int imageId = SalesFilterActivity.groupImages.get(groupPosition);
groupViewHolder.mImage.setImageResource(imageId);
convertView.setTag(groupViewHolder);
} else {
groupViewHolder = (GroupViewHolder) convertView.getTag();
}
groupViewHolder.mGroupText.setText(groupText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
if (mListDataChild.get(mListDataGroup.get(groupPosition)) != null) {
return mListDataChild.get(mListDataGroup.get(groupPosition)).size();
} else {
return 0;
}
}
@Override
public String getChild(int groupPosition, int childPosition) {
try {
return mListDataChild.get(mListDataGroup.get(groupPosition)).get(childPosition);
} catch (Exception e) {
e.printStackTrace();
return "0";
}
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
final int mGroupPosition = groupPosition;
final int mChildPosition = childPosition;
childText = getChild(mGroupPosition, mChildPosition);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) this.mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.sfilter_list_item, null);
childViewHolder = new ChildViewHolder();
childViewHolder.mChildText = (TextView) convertView
.findViewById(R.id.txtdeptname);
childViewHolder.mCheckBox = (CheckBox) convertView
.findViewById(R.id.itemCheckBox);
convertView.setTag(R.layout.sfilter_list_item, childViewHolder);
} else {
childViewHolder = (ChildViewHolder) convertView
.getTag(R.layout.sfilter_list_item);
}
childViewHolder.mChildText.setText(childText);
//childViewHolder.mCheckBox.setOnCheckedChangeListener(null);
convertView.setOnClickListener(null);
if (mChildCheckStates.containsKey(mGroupPosition)) {
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
if(mChildPosition >= getChildrenCount(mGroupPosition))
{
}
else
{
try
{
if(mGroupPosition == 1)
{
childViewHolder.mCheckBox.setChecked(false);
}
else {
childViewHolder.mCheckBox.setChecked(getChecked[mChildPosition]);
}
}
catch (Exception e)
{
}
}
} else {
Log.e("does not contains grpPos "," "+mGroupPosition);
boolean getChecked[] = new boolean[getChildrenCount(mGroupPosition)];
mChildCheckStates.put(mGroupPosition, getChecked);
childViewHolder.mCheckBox.setChecked(false);
}
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RelativeLayout rel = (RelativeLayout)v;
CheckBox cb = (CheckBox) rel.getChildAt(1);
TextView txtView = (TextView) rel.getChildAt(0);
String txtSubdept = txtView.getText().toString();//getChild(0,mChildPosition);
////Log.e("txtSubDept"," "+txtSubdept);
//
if(mGroupPosition == 1)
{
Log.e("mChildCheckStates for Group Product"," "+mChildCheckStates.get(1).length);
cb.setChecked(true);
return;
}
if (cb.isChecked() == false) {
////Log.e("checkbox is not selected", "");
if (Reusable_Functions.chkStatus(mContext))
{
//Log.e("mChildCheckStates"," "+mChildCheckStates.get(0).length);
SalesFilterActivity.pfilter_list.collapseGroup(1);
Reusable_Functions.sDialog(mContext, "Loading data...");
offsetvalue = 0;
count = 0;
limit = 100;
productList = new ArrayList<String>();
//Log.e("text value "," "+txtSubdept);
requestFilterProductAPI(offsetvalue, limit, txtSubdept);
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
getChecked[mChildPosition] = true;
mChildCheckStates.put(mGroupPosition, getChecked);
cb.setChecked(true);
} else {
// Reusable_Functions.hDialog();
Toast.makeText(mContext, "Check your network connectivity", Toast.LENGTH_LONG).show();
}
} else {
////Log.e("checkbox is selected", "");
////Log.e("selected text value "," "+txtSubdept);
for (int i = 0; i < arrfilter.size(); i++) {
if (arrfilter.get(i).getSubdept().equals(txtSubdept)) {
SalesFilterActivity.pfilter_list.collapseGroup(1);
productnamelist.removeAll(arrfilter.get(i).getprodarray());
arrfilter.remove(i);
boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
getChecked[mChildPosition] = false;
mChildCheckStates.put(mGroupPosition, getChecked);
cb.setChecked(false);
SalesFilterActivity.pfilter_list.expandGroup(1);
return;
}
}
}
}
});
return convertView;
}
@Override
public boolean isChildSelectable ( int groupPosition, int childPosition){
return false;
}
@Override
public boolean hasStableIds () {
return false;
}
public final class GroupViewHolder {
TextView mGroupText;
ImageView mImage;
}
public final class ChildViewHolder {
TextView mChildText;
CheckBox mCheckBox;
}
public void requestFilterProductAPI(int offsetvalue1, int limit1, final String subdeptName) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this.mContext);
String userId = sharedPreferences.getString("userId", "");
final String bearertoken = sharedPreferences.getString("bearerToken", "");
Cache cache = new DiskBasedCache(mContext.getCacheDir(), 1024 * 1024); // 1MB cap
BasicNetwork network = new BasicNetwork(new HurlStack());
RequestQueue queue = new RequestQueue(cache, network);
queue.start();
String url = ConstsCore.web_url + "/v1/display/hourlytransproducts/" + userId + "?view=productName&prodLevel3Desc=" + subdeptName.replaceAll(" ", "%20").replaceAll("&", "%26") + "&offset" + offsetvalue + "&limit" + limit;
Log.i("URL ", url);
final JsonArrayRequest postRequest = new JsonArrayRequest(Request.Method.GET, url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.i("Sub Dept Response", response.toString());
try {
if (response.equals(null) || response == null || response.length() == 0 && count == 0) {
Reusable_Functions.hDialog();
Toast.makeText(mContext, "no data found", Toast.LENGTH_LONG).show();
} else if (response.length() == limit) {
Reusable_Functions.hDialog();
for (int i = 0; i < response.length(); i++) {
JSONObject productName1 = response.getJSONObject(i);
ProductName = productName1.getString("productName");
//Log.e("Product Name:", ProductName);
productList.add(ProductName);
productnamelist.add(ProductName);
}
offsetvalue = (limit * count) + limit;
count++;
requestFilterProductAPI(offsetvalue, limit, subdeptName);
} else if (response.length() < limit) {
for (int i = 0; i < response.length(); i++) {
JSONObject productName1 = response.getJSONObject(i);
ProductName = productName1.getString("productName");
//Log.e("Product Name:", ProductName);
productList.add(ProductName);
productnamelist.add(ProductName);
}
Collections.sort(productnamelist);
mListDataChild.put(mListDataGroup.get(1), productnamelist);
FilterArray filterArray = new FilterArray();
filterArray.setSubdept(subdeptName);
filterArray.setprodArray((ArrayList) productList);
arrfilter.add(filterArray);
SalesFilterActivity.pfilter_list.expandGroup(1);
Reusable_Functions.hDialog();
}
} catch (Exception e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Reusable_Functions.hDialog();
error.printStackTrace();
}
}
) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Content-Type", "application/json");
params.put("Authorization", "Bearer " + bearertoken);
return params;
}
};
int socketTimeout = 60000;//5 seconds
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
postRequest.setRetryPolicy(policy);
queue.add(postRequest);
}
public void requestProductArticleAPI(int offsetvalue1, int limit1, final String prodName) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this.mContext);
String userId = sharedPreferences.getString("userId", "");
final String bearertoken = sharedPreferences.getString("bearerToken", "");
Cache cache = new DiskBasedCache(mContext.getCacheDir(), 1024 * 1024); // 1MB cap
BasicNetwork network = new BasicNetwork(new HurlStack());
RequestQueue queue = new RequestQueue(cache, network);
queue.start();
String url = ConstsCore.web_url + "/v1/display/hourlytransproducts/" + userId + "?view=articleOption&productName=" + prodName.replaceAll(" ", "%20").replaceAll("&", "%26") + "&offset=" + offsetvalue + "&limit=" + limit;
Log.e("requestProductArticleAPI URL ", url);
final JsonArrayRequest postRequest = new JsonArrayRequest(Request.Method.GET, url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.i("requestProductArticleAPI Response", response.toString());
try {
if (response.equals(null) || response == null || response.length() == 0 && count == 0) {
Reusable_Functions.hDialog();
Toast.makeText(mContext, "no article data found", Toast.LENGTH_LONG).show();
} else {
if (response.length() == limit) {
//Reusable_Functions.hDialog();
for (int i = 0; i < response.length(); i++) {
JSONObject productName1 = response.getJSONObject(i);
String ProductName = productName1.getString("productName");
//Log.e("Product Name:", ProductName);
ArticleOption = productName1.getString("articleOption");
//String option = productName.getString("articleOption");
articleList.add(ArticleOption);
articleOptionList.add(ArticleOption);
//Reusable_Functions.progressDialog.cancel();
}
offsetvalue = (limit * count) + limit;
count++;
requestProductArticleAPI(offsetvalue, limit, prodName);
} else if (response.length() < limit) {
for (int i = 0; i < response.length(); i++) {
JSONObject productName1 = response.getJSONObject(i);
String ProductName = productName1.getString("productName");
//Log.e("Product Name:", ProductName);
ArticleOption = productName1.getString("articleOption");
//String option = productName.getString("articleOption");
articleList.add(ArticleOption);
articleOptionList.add(ArticleOption);
}
Collections.sort(articleOptionList);
mListDataChild.put(mListDataGroup.get(2), articleOptionList);
FilterArray filterArray = new FilterArray();
filterArray.setprodname(prodName);
filterArray.setArticlearray((ArrayList) articleList);
arrfilter.add(filterArray);
SalesFilterActivity.pfilter_list.expandGroup(2);
Reusable_Functions.hDialog();
}
}
} catch (Exception e) {
//Log.e("Exception e", e.toString() + "");
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Reusable_Functions.hDialog();
error.printStackTrace();
}
}
) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Content-Type", "application/json");
params.put("Authorization", "Bearer " + bearertoken);
return params;
}
};
int socketTimeout = 60000;//5 seconds
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
postRequest.setRetryPolicy(policy);
queue.add(postRequest);
}
}
我已经完成了。它保留了第一组的位置，我使用了mChildCheckStates但是如果我为其他组位置调用了相同的功能，那么它就不起作用了。如何在滚动时保持复选框位置。