android-自定义ExpandableListview在子级中包含另一个扩展按钮
作者：互联网
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;
}
}
}
标签：listview,expandablelistview,android-custom-view,android 来源： https://codeday.me/bug/20191121/2055367.html