我想实现这种类型的列表视图.问题是当我滚动列表时,视图已刷新.任务是显示默认情况下最多可扩展到3个子组的组,当单击”(加号)按钮时,该组的子项将被扩展,新按钮将显示在该组下,以将该组折叠为默认布局.使用plus(”)按钮显示的3个子项目.当任何组的子项大于3时,将显示加号按钮,如果子项小于3或等于3,则所有子项将不带加号按钮显示,但如果子项大于3,则显示加号按钮将显示.这里的“ DIAPERS”和“ LAUNDRY DETERGENT”是组名.
当前方案：-如果子位置> 3,然后将文本视图的可见性设置为“ GONE”,将按钮的可见性设置为“ VISIBLE”.但是问题在于,如果子项大于4,并且我单击加号按钮以展开group,则仅显示4个子项5或不显示下一个子项.
如果您需要此代码,请在评论中提出,我将为您提供代码.
解决方法:
首先,您需要为可扩展列表视图的子视图设置一个最小限制.像2或3个孩子一样,第一次会从您的数据库或Web服务中下载或获取.
然后,在该限制变量上,您可以将可扩展列表视图限制为仅显示前2和3个子项.
然后,使用子限制变量,您还需要一个标志变量,其中包含以下信息：“如果列表包含3个以上的孩子,则值为1；如果列表包含3个或少于3个孩子,则值为0”.
在flag变量的值上,您可以在Android中设置加号按钮的隐藏值和可见值.
对于加号按钮,我认为下面给出的代码会有所帮助.单击后,只需再次调用数据库并获取所有子项并显示它们,然后刷新可扩展列表视图即可.
public class ProductListingExpandableAdapter extends Baseexpandablelistadapter { public String TAG = ProductListingExpandableAdapter.class.getSimplename(); private Context _context;int clickedposition; private List<String> _ListDataheader; // header Titles child data in format of header Title, child Title private HashMap<String, ArrayList<String>> _ListDataChild; ArrayList<String> categoryID; String stateID,countryID; ArrayList<ProductDataBean> ProductList; ArrayList<ProductListingdisplayCheck> checkArrayList; int _ListSize;String user_ID; ProductDataBean bean; /* Variable to do lazy loading of images */ Handler handler; Runnable runnable; /* array List to hold data */ ArrayList<String> BrandList; ImageLoader imageLoader; private displayImageOptions options; Activity a; String RetailerImageUrl,BrandImageUrl; public ProductListingExpandableAdapter(Context context, List<String> ListDataheader, HashMap<String, ArrayList<String>> ListChildData, int size,ArrayList<ProductDataBean> ProductList,ArrayList<ProductListingdisplayCheck> checkArrayList,ArrayList<String> categoryID, String user_ID,String stateID,String countryID) { this._context = context; this._ListDataheader = ListDataheader; this._ListDataChild = ListChildData; this.categoryID = categoryID; this.checkArrayList = checkArrayList; this._ListSize = size; this.ProductList = ProductList; this.checkArrayList = checkArrayList; this.user_ID = user_ID; this.countryID = countryID; this.stateID = stateID; options = new displayImageOptions.Builder() .showImageForEmptyUrl(R.drawable.thumb_demo).cacheInMemory() .cacheOndisc().build(); imageLoader = ImageLoader.getInstance(); Log.d("....return the the event image loader class...==", ""+imageLoader.getClass()); } @OverrIDe public Object getChild(int groupposition, int childPosititon) { //Log.i("Object getChild",String.valueOf(this._ListDataChild.get(this._ListDataheader.get(groupposition)).get(childPosititon))); return this._ListDataChild.get(this._ListDataheader.get(groupposition)).get(childPosititon); } @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 String childText = (String) getChild(groupposition, childposition); if (convertVIEw == null) { LayoutInflater infalinflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertVIEw = infalinflater.inflate(R.layout.custom_brand_retailer_layout_new, null); } relativeLayout ParentLayout= (relativeLayout) convertVIEw.findVIEwByID(R.ID.parentLayout); /* Retailer Image*/ ImageVIEw retailerImage = (ImageVIEw) convertVIEw.findVIEwByID(R.ID.retailerImage); /* Brand Image */ ImageVIEw brandImage = (ImageVIEw) convertVIEw.findVIEwByID(R.ID.brandImage); /* Product PricePerUnit */ TextVIEw pricePerUnit = (TextVIEw) convertVIEw.findVIEwByID(R.ID.pricePerItem); /* Product PricePerUnit */ TextVIEw packetPrice = (TextVIEw) convertVIEw.findVIEwByID(R.ID.pricePerPacket); /* Product name */ TextVIEw productname = (TextVIEw) convertVIEw.findVIEwByID(R.ID.Productname); /* Group close Images */ relativeLayout addMore = (relativeLayout) convertVIEw.findVIEwByID(R.ID.addMore); /* Minus button Image */ ImageVIEw minusItems = (ImageVIEw) convertVIEw.findVIEwByID(R.ID.minusItems); /* Minus button Image */ ImageVIEw plusItems = (ImageVIEw) convertVIEw.findVIEwByID(R.ID.plusItems); try { JsONObject jObject = new JsONObject(childText); // Log.i("jObject",String.valueOf(jObject)); pricePerUnit.setText ("$"+jObject.getString("pricePerItem")); packetPrice .setText ("$"+jObject.getString("product_price")); String itemnameString = ""; String Title = jObject.getString("product_name"); if (Title.length() > 44) { itemnameString = Title.substring(0, 45)+"..."; } else { itemnameString = Title; } productname.setText(itemnameString); RetailerImageUrl = jObject.getString("retailer_image_url_small"); BrandImageUrl = jObject.getString("brand_image_url"); // String RetailerImageUrl = jObject.getString("pricePerItem"); } catch (JsONException e) { e.printstacktrace(); } //========================================================================================= // Log.e("Pagination ArrayList size", String.valueOf(Constants.Paginationposition.size())); String PaginationPos = Constants.Paginationposition.get(groupposition); Log.e ("PaginationPos", String.valueOf(PaginationPos)); // Log.e("is last child", String.valueOf(isLastChild)); /* HIDe or Show Group Close option */ Log.e("Pagination ArrayList size", String.valueOf(Constants.Paginationposition.size())); if(PaginationPos.equals("1") && childposition == 2 && isLastChild == true ) { addMore.setVisibility(VIEw.VISIBLE); minusItems.setVisibility(VIEw.GONE ); plusItems.setVisibility(VIEw.VISIBLE); } else if(PaginationPos.equals("0") && childposition > 2 && isLastChild == true ) { addMore.setVisibility(VIEw.GONE); } else if(PaginationPos.equals("2") && childposition > 2 && isLastChild == true ) { plusItems.setVisibility(VIEw.GONE); addMore.setVisibility (VIEw.VISIBLE); minusItems.setVisibility(VIEw.VISIBLE); minusItems.setVisibility(VIEw.VISIBLE); minusItems.setimageResource(R.drawable.minus); } else { addMore.setVisibility(VIEw.GONE); } //================================================================================== minusItems.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw v) { Log.e("Constants.ListDataheader.get(groupposition)", Constants.ListDataheader.get(groupposition)); String keyword = Constants.ListDataheader.get(groupposition); String alternate = ProductListingExpandableListVIEwActivity.demoJsonObjectTesting; // check whether the List for keyword is present ArrayList<String> alternateList = _ListDataChild.get(keyword); if(alternateList == null) { Log.i(TAG, "List is null"); /* alternateList = new ArrayList<String>(); _ListDataChild.put(keyword, alternateList); */ } else { Constants.Paginationposition.set(groupposition, "1"); ArrayList<String> newList = new ArrayList<String>(); int size = alternateList.size(); Log.e("alternateList size", String.valueOf( alternateList.size())); for(int i=0;i<3;i++) { newList.add(alternateList.get(i)); } alternateList.clear(); for(int i=0;i<3;i++) { alternateList.add(newList.get(i)); } Log.i("alternate List size",String.valueOf( alternateList.size())); ProductListingExpandableAdapter.this.notifyDataSetChanged(); //ProductListingExpandableAdapter.this.notifyDataSetInvalIDated(); /*Intent showSearchResult = new Intent(_context,ProductListingExpandableListVIEwActivity.class); showSearchResult.putExtra("ShowSeachResult", "2"); _context.startActivity(showSearchResult); ((Activity)_context).finish(); Apply our splash exit (fade out) and main entry (fade in) animation Transitions. ((Activity)_context). overrIDePendingTransition(R.anim.mainfadein, R.anim.splashfadeout);*/ } } }); addMore.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw v) { Log.i("addMore images List clicked", "addMore image clicked"); //Clicked postion of group clickedposition = groupposition; String keyword = Constants.ListDataheader.get(groupposition); Log.i("keyword", keyword); for( int ii = 0;ii<Constants.ListDataheader.size();ii ++) { String currentKeyword = Constants.ListDataheader.get(ii); if(currentKeyword.equals(keyword)==false) { // check whether the List for keyword is present ArrayList<String> alternateList = _ListDataChild.get(currentKeyword); if(alternateList == null) { Log.i(TAG,Constants.ListDataheader.get(groupposition)+ " List is null"); /*alternateList = new ArrayList<String>(); _ListDataChild.put(keyword, alternateList); */ } else { if(alternateList.size()>2) { Constants.Paginationposition.set(ii, "1"); Log.i(TAG,Constants.ListDataheader.get(groupposition)+ "insIDe else"); ArrayList<String> newList = new ArrayList<String>(); int size = alternateList.size(); Log.e("alternateList size", String.valueOf( alternateList.size())); for (int i=0; i<3;i++) { newList.add(alternateList.get(i)); } alternateList.clear(); for (int j=0; j<3; j++) { alternateList.add(newList.get(j)); } Log.i("alternate List size",String.valueOf( alternateList.size())); }} } } /* Calling Json webservices */ new LoadProductData(_context,groupposition).execute(); } }); /* Lazy loading class method for loading Retailer images */ imageLoader.init(ImageLoaderConfiguration.createDefault(_context)); if(RetailerImageUrl.equals("no image")) { retailerImage.setBackgroundResource(R.drawable.no_img); } else { imageLoader.displayImage(RetailerImageUrl,retailerImage, options, new ImageLoadingListener() { @OverrIDe public voID onl oadingComplete() {} @OverrIDe public voID onl oadingFailed() {} @OverrIDe public voID onl oadingStarted() {} }); } int SDK_INT = androID.os.Build.VERSION.SDK_INT; if (SDK_INT>=16) { if(BrandImageUrl.equals("no image")==false) { Drawable Branddrawable= Loadimage(BrandImageUrl); brandImage.setBackground(Branddrawable); } } else { if(BrandImageUrl.equals("no image")==false) { Drawable Branddrawable= Loadimage(BrandImageUrl); brandImage.setBackgroundDrawable(Branddrawable); } } return convertVIEw; } @OverrIDe public int getChildrenCount(int groupposition) { return this._ListDataChild.get(this._ListDataheader.get(groupposition)).size(); } @OverrIDe public Object getGroup(int groupposition) { return this._ListDataheader.get(groupposition); } @OverrIDe public int getGroupCount() { return this._ListDataheader.size(); } @OverrIDe public long getGroupID(int groupposition) { return groupposition; } @OverrIDe public VIEw getGroupVIEw(int groupposition, boolean isExpanded,VIEw convertVIEw, VIEwGroup parent) { String headerTitle = (String) getGroup(groupposition); if (convertVIEw == null) { LayoutInflater infalinflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertVIEw = infalinflater.inflate (R.layout.List_group, null); } TextVIEw lblListheader = (TextVIEw) convertVIEw.findVIEwByID(R.ID.lblListheader); lblListheader.setTypeface (null, Typeface.BolD); lblListheader.setText (headerTitle); ExpandableListVIEw mExpandableListVIEw = (ExpandableListVIEw) parent; mExpandableListVIEw.expandGroup(groupposition); return convertVIEw; } @OverrIDe public boolean hasStableIDs() { return false; } @OverrIDe public boolean isChildSelectable(int groupposition, int childposition) { return true; } // Background async task /* State/Province List background thread */ class LoadProductData extends AsyncTask<VoID, VoID, VoID> { private ProgressDialog dialog;String response; Context context;int GroupPos; private JsONArray Jsonarray, stateJsonArray; public LoadProductData(Context context,int GroupPos) { super(); this.GroupPos = GroupPos; this.context = context; } @OverrIDe protected voID onPreExecute() { super.onPreExecute(); dialog = ProgressDialog.show(context, "","Please wait...", true, true);dialog.show(); Log.e("Adapter pre execute ", "in the pre-execute loop"); } @OverrIDe protected VoID doInBackground(VoID... params) { try { //Constants.ListDataChild.clear();Constants.ListDataheader.clear();Constants.productListing.clear(); Log.e(TAG , "in the background-execute loop"); UserFunctions userFunctions = new UserFunctions(); String categoryID = String.valueOf(Constants.categoryID.get(GroupPos)); Log.e("categoryID" , Constants.categoryID.get(GroupPos)); JsONObject categoryJson = userFunctions.SinglecategoryListRequest(categoryID,user_ID,stateID,countryID); // Log.i("Product lisiting Json Array",String.valueOf(categoryJson)); String result = categoryJson.getString("result"); Log.i("result",result); if(result.equals("no records found")) { response = "no records found"; } else { response = "record found"; // SearchResult refers to the current element in the array // "search_result" JsONObject questionMark = categoryJson.getJsONObject("result"); Iterator keys = questionMark.keys(); ProductListingdisplayCheck addCheck; int i = 0; while (keys.hasNext()) { // Loop to get the dynamic key String currentDynamicKey = (String) keys.next(); // Log.i("current Dynamic key", // String.valueOf(currentDynamicKey)); ArrayList<String> BrandList = new ArrayList<String>(); // Get the value of the dynamic key JsONObject currentDynamicValue = questionMark.getJsONObject(currentDynamicKey); // Log.i("current Dynamic Value"+String.valueOf(i), String product_List = currentDynamicValue.getString("product_Listing"); // Log.i("product_Listing",String.valueOf(product_List)); addCheck = new ProductListingdisplayCheck(); addCheck.setCheckStatus(0); checkArrayList . add(addCheck); Log.i("checkArrayList size",String.valueOf(checkArrayList.size())); JsONArray product_Listing = currentDynamicValue.getJsONArray ("product_Listing"); BrandList = Constants.ListDataChild.get(currentDynamicKey); Log.i("BrandList size", String.valueOf(BrandList.size())); BrandList.clear(); for (int ii = 0; ii < product_Listing.length(); ii++) { JsONObject Jsonobject = product_Listing.getJsONObject(ii); String JsonObjectString = String.valueOf(Jsonobject); if ( BrandList == null ) { BrandList = new ArrayList<String>(); Constants.ListDataChild.put(currentDynamicKey, BrandList); } BrandList.add(JsonObjectString); } //HashMap<String, ArrayList<String>> _ListDataChild = null; /* String keyword = "Wipes"; String alternate = ProductListingExpandableListVIEwActivity.demoJsonObjectTesting; // check whether the List for keyword is present ArrayList<String> alternateList = _ListDataChild.get(keyword); if(alternateList == null) { alternateList = new ArrayList<String>(); _ListDataChild.put(keyword, alternateList); } alternateList.add(ProductListingExpandableListVIEwActivity.demoJsonObjectTesting); */ Constants.Paginationposition.set(GroupPos, "2"); Constants.ListDataChild.put(Constants.ListDataheader.get(clickedposition), BrandList); Log.i("hash map size", String.valueOf(Constants.ListDataChild.size())); /* Update the value of position */ i++; } } } catch (Exception e) { e.printstacktrace(); } return null; } @OverrIDe protected voID onPostExecute(VoID result) { super.onPostExecute(result); dialog.dismiss(); if(response.equals("no records found")) { Toast.makeText(_context, "No Record Found.", 500).show(); } else { ProductListingExpandableAdapter.this.notifyDataSetChanged(); /*Intent showSearchResult = new Intent(_context,ProductListingExpandableListVIEwActivity.class); showSearchResult.putExtra("ShowSeachResult", "2"); _context.startActivity(showSearchResult); ((Activity)context).finish(); Apply our splash exit (fade out) and main entry (fade in) animation Transitions. ((Activity)context). overrIDePendingTransition(R.anim.mainfadein, R.anim.splashfadeout);*/ } } @OverrIDe protected voID onProgressUpdate(VoID... values) { super.onProgressUpdate(values); } } private Drawable Loadimage(String url) { try { inputStream is = (inputStream) new URL(url).getContent(); Drawable d = Drawable.createFromStream(is, "src name"); return d; } catch (Exception e) { // tv.setText("Exc="+e); return null; } } }以上是内存溢出为你收集整理的android-自定义ExpandableListview在子级中包含另一个扩展按钮全部内容，希望文章能够帮你解决android-自定义ExpandableListview在子级中包含另一个扩展按钮所遇到的程序开发问题。
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