解決android expandablelistview 裡面嵌入gridview行資料重複問題
阿新 • • 發佈：2019-01-04
最近做了一個“csdn專家部落格App” 當然了是android版本，在專家瀏覽頁面，我才用了expandablelistview 元件來顯示專家分類，每個分類點選之後可以顯示專家的頭像和名字。
很簡單一個功能，先看效果圖：
結果發現一個問題，就是每個分類裡的資料存在重複插入好幾次的現象；
ExpertGridAdapter.java gridview的adapter
public class ExpertGridAdapter extends BaseAdapter { private LayoutInflater inflater; private CsBlogger[] datals; private Context mContext; private String TAG="ExpertGridAdapter"; public ExpertGridAdapter(Context context,List<CsBlogger> childs) { this.inflater = LayoutInflater.from(context); datals=new CsBlogger[childs.size()]; childs.toArray(datals); CsLog.d("maomao", "childs.size:"+childs.size()); mContext=context; } @Override public int getCount() { return datals.length; } @Override public Object getItem(int position) { return datals[position]; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView==null) { holder=new ViewHolder(); convertView=this.inflater.inflate(R.layout.csblog_expert_item_menu, null); holder.iv=(ImageView) convertView.findViewById(R.id.item_image); holder.tv=(TextView) convertView.findViewById(R.id.item_text); convertView.setTag(holder); } else { holder=(ViewHolder) convertView.getTag(); } CsBlogger expert=datals[position]; DisplayImageOptions options; // 顯示影象設定 ImageLoader imageLoader = ImageLoader.getInstance();// 得到圖片載入器 // 圖片載入器初始化 imageLoader.init(ImageLoaderConfiguration.createDefault(mContext)); // 使用DisplayImageOptions.Builder()建立DisplayImageOptions options = new DisplayImageOptions.Builder() .showStubImage(R.drawable.blogger) // 設定圖片下載期間顯示的圖片 .showImageForEmptyUri(R.drawable.blogger) // 設定圖片Uri為空或是錯誤的時候顯示的圖片 .showImageOnFail(R.drawable.blogger) // 設定圖片載入或解碼過程中發生錯誤顯示的圖片 .cacheInMemory() // 設定下載的圖片是否快取在記憶體中 .cacheOnDisc() // 設定下載的圖片是否快取在SD卡中 .displayer(new RoundedBitmapDisplayer(20)) // 設定成圓角圖片 .build(); // 建立配置過得DisplayImageOption物件 // 非同步載入圖片 專家頭像 imageLoader .displayImage(expert.getUserface(), holder.iv, options); holder.tv.setText(expert.getNickname()); return convertView; } private class ViewHolder{ ImageView iv; TextView tv; } }
ExpertsListViewAdapter.java 可擴充套件的listview
public class ExpertsListViewAdapter extends BaseExpandableListAdapter implements OnItemClickListener { public static final int ItemHeight = 136;// 每項的高度 public static final int PaddingLeft = 96;// 每項的高度 private int myPaddingLeft = 0; private List<TreeNode> treeNodes = new ArrayList<TreeNode>(); private Context parentContext; private LayoutInflater layoutInflater; public ExpertsListViewAdapter(Context view, int myPaddingLeft,List<TreeNode> treeNodes) { parentContext = view; this.myPaddingLeft = myPaddingLeft; this.treeNodes=treeNodes; } public void RemoveAll() { treeNodes.clear(); } public CsBlogger getChild(int groupPosition, int childPosition) { return treeNodes.get(groupPosition).childs.get(childPosition); } @Override public int getChildrenCount(int groupPosition) { //return treeNodes.get(groupPosition).childs.size(); // 返回值必須為1，否則會重複資料 return 1; } public TextView getTextView(Context context) { AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, ItemHeight); TextView textView = new TextView(context); textView.setLayoutParams(lp); textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); return textView; } class ExpandableListHolder { CsGridView grdiview; } private ExpertGridAdapter adatper; /** * 可自定義ExpandableListView */ public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { CsLog.d("maomao", "getChildView, groupPosition:"+groupPosition+",childs size:"+treeNodes.get(groupPosition).childs.size()); //if (convertView == null) { CsLog.d("maomao", "converView is null"); layoutInflater = (LayoutInflater) parentContext .getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = layoutInflater.inflate(R.layout.csblog_expert_view, null); CsGridView toolbarGrid = (CsGridView) convertView .findViewById(R.id.GridView_toolbar); toolbarGrid.setNumColumns(4);// 設定每行列數 toolbarGrid.setGravity(Gravity.CENTER);// 位置居中 toolbarGrid.setHorizontalSpacing(10);// 水平間隔 adatper=new ExpertGridAdapter(parentContext,treeNodes.get(groupPosition).childs); toolbarGrid.setAdapter(adatper);// 設定選單Adapter toolbarGrid.setOnItemClickListener(this); adatper.notifyDataSetChanged(); } //else{ // CsLog.d("maomao", "convertView!=null"); //} return convertView; } /** * 可自定義list */ public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getTextView(this.parentContext); String gname=getGroup(groupPosition).toString()+"("+treeNodes.get(groupPosition).childs.size()+")"; textView.setText(gname); textView.setPadding(myPaddingLeft + PaddingLeft, 0, 0, 0); return textView; } public long getChildId(int groupPosition, int childPosition) { return childPosition; } public Object getGroup(int groupPosition) { return treeNodes.get(groupPosition).parent; } public int getGroupCount() { return treeNodes.size(); } public long getGroupId(int groupPosition) { return groupPosition; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public boolean hasStableIds() { return true; } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(parentContext, "當前選中的是:" + position, Toast.LENGTH_SHORT) .show(); } }
大家注意這個方法，知道這兩種寫法的區別嗎？ 當然 return1 ，就可以得到上面截圖的效果。
@Override
public int getChildrenCount(int groupPosition)
{
//return treeNodes.get(groupPosition).childs.size();
// 返回值必須為1，否則會重複資料
return 1;
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