listVIew中的自定義BaseAdapter無法通知數據集更改

我擴展了一個ViewGroup，其中包含listView。當我點擊列表項時，我調用了notifyDataChanged方法，但它沒有正常工作，getCount方法被調用，但getView方法不被調用，儘管getCount方法返回> 0。除此之外，我發現listView不再是可點擊的。那我不明白。如果我通過調用setAdapter（adpater）重置適配器，那麼listView將變爲空，（但getCount方法被調用，getView方法也不會調用。）任何人都可以幫助我嗎？listVIew中的自定義BaseAdapter無法通知數據集更改

代碼：

public class SelectDistrictView extends ViewGroup { 

private ListView districtList = null; 
private ListView sectionList = null; 
private SelectDistrictAdapter districtAdapter = null; 
private ArrayAdapter<String> sectionAdapter = null; 

private List<String> districtStrList = null; 
private int selectedDist = 2; 

private ImageButton dismissBtn = null; 
private PopupWindow pop = null; 


public SelectDistrictView(Context context) { 
    super(context); 
    // TODO Auto-generated constructor stub 
    ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); 

    districtList = new ListView(context); 
    sectionList = new ListView(context); 
    districtList.setLayoutParams(params); 
    sectionList.setLayoutParams(params);   

    districtStrList = new ArrayList<String>(); 
    districtStrList.add("區域1"); 
    districtStrList.add("區域2"); 
    districtStrList.add("區域3"); 
    districtAdapter = new SelectDistrictAdapter(context); 
    districtList.setAdapter(districtAdapter); 

    districtList.setBackgroundColor(Color.rgb(238, 238, 238)); 
    // districtList.setCacheColorHint(Color.argb(0, 0, 0, 0)); 
    // districtList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 
    // districtList.setSelector(R.drawable.bg_select_district); 

    final Context _context= context; 
    districtList.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
       long arg3) { 
      // TODO Auto-generated method stub 
      selectedDist = arg2; 
      districtList.setSelection(arg2); 
      //districtStrList.remove(0); 
      //UpdateList task = new UpdateList(); 
      //SherlockActivity a = (SherlockActivity)_context; 
      //a.runOnUiThread(task); 
      districtAdapter.notifyDataSetChanged(); 
      //districtList.setAdapter(districtAdapter); 
      Toast.makeText(_context, "" + arg2, Toast.LENGTH_SHORT).show(); 
     } 
    }); 
    //districtList.setDivider(getResources().getDrawable(R.color.select_district_delive_color)); 
    //districtList.setSelector(R.drawable.select_district_list_selector); 

    sectionAdapter = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1); 
    sectionAdapter.add("商圈1"); 
    sectionAdapter.add("商圈2"); 
    sectionAdapter.add("商圈3"); 
    sectionAdapter.add("商圈4"); 
    sectionAdapter.add("商圈5"); 
    sectionAdapter.add("商圈3"); 
    sectionAdapter.add("商圈4"); 
    sectionAdapter.add("商圈5"); 
    sectionAdapter.add("商圈3"); 
    sectionAdapter.add("商圈4"); 
    sectionAdapter.add("商圈5"); 
    sectionList.setAdapter(sectionAdapter); 
    sectionList.setBackgroundColor(Color.rgb(220, 220, 220)); 
    //sectionList.setSelector(Color.rgb(169, 207, 56)); 

    dismissBtn = new ImageButton(context); 
    //dismissBtn.setBackgroundResource(R.drawable.select_district_dismiss); 
    dismissBtn.setImageResource(R.drawable.select_district_dismiss); 
    dismissBtn.setBackgroundDrawable(null); 
    //dismissBtn.setGravity(Gravity.CENTER); 
    dismissBtn.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      if (null != pop && pop.isShowing()) { 
       pop.dismiss(); 
      } 
     } 
    }); 
} 

public PopupWindow getPop() { 
    return pop; 
} 

public void setPop(PopupWindow pop) { 
    this.pop = pop; 
} 

@Override 
protected void onLayout(boolean changed, int l, int t, int r, int b) { 
    // TODO Auto-generated method stub 
    boolean containDist = false, containSect = false, containDismiss = false; 
    for(int i = 0; i < this.getChildCount(); i++) { 
     View cView = this.getChildAt(i); 
     if (cView == districtList) { 
      containDist = true; 
      continue; 
     } 

     if (cView == sectionList) { 
      containSect = true; 
      continue; 
     } 

     if (cView == dismissBtn) { 
      containDismiss = true; 
      continue; 
     } 

    } 

    int lWidth = CommonFunction.dp2px(getContext(), 120); 
    int fHeight = CommonFunction.dp2px(getContext(), 48); 
    if (!containDist) { 
     districtList.layout(0, 0, lWidth, b - t - fHeight); 
     addViewInLayout(districtList, 0, null, true); 
    } 

    if (!containSect) { 
     sectionList.layout(lWidth, 0, r - l, b - t - fHeight); 
     addViewInLayout(sectionList, 0, null, true); 
    } 

    if (!containDismiss) { 
     dismissBtn.layout(0, b - t - fHeight, r - l, b - t); 
     addViewInLayout(dismissBtn, 0, null, true); 
    } 
    invalidate(); 
} 

public static PopupWindow popSelector(Context context, View parent) { 
    SelectDistrictView view = new SelectDistrictView(context); 
    PopupWindow pop = new PopupWindow(view, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); 
    pop.setFocusable(true); 
    pop.setOutsideTouchable(true); 
    pop.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.bg_select_district)); 
    //pop.showAtLocation(parent, Gravity.CENTER, 0, 0); 
    view.setPop(pop); 
    pop.showAsDropDown(parent, 0, 0); 
    return pop; 
} 

private final class SelectDistrictAdapter extends BaseAdapter { 

    private Context context = null; 
    private LayoutInflater inflater = null; 

    public SelectDistrictAdapter(Context context) { 
     super(); 
     this.context = context; 

     inflater = LayoutInflater.from(this.context); 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     Log.v("reflesh", "all:" + districtStrList.size()); 
     return districtStrList.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return districtStrList.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     Log.v("reflesh", "position:" + position); 
     ViewHolder holder; 
     if (null == convertView) { 
      convertView = inflater.inflate(R.layout.select_district_list_item, null); 

      holder = new ViewHolder(); 
      holder.tvName = (TextView)convertView.findViewById(R.id.select_district_list_item_name); 
      holder.viewSelect = convertView.findViewById(R.id.select_district_list_item_selected_underline); 
      holder.viewSelectTriangle = (ImageView)convertView.findViewById(R.id.select_district_list_item_selected_triangle); 

      convertView.setTag(holder); 
     } else { 
      holder = (ViewHolder)convertView.getTag(); 
     } 

     holder.tvName.setText(districtStrList.get(position)); 
     if(selectedDist == position) { 
      //convertView.setBackgroundColor(Color.rgb(220, 220, 220)); 
      holder.viewSelect.setVisibility(View.VISIBLE); 
      holder.viewSelectTriangle.setVisibility(View.VISIBLE); 
     } else { 
      //convertView.setBackgroundColor(Color.rgb(238, 238, 238)); 
      holder.viewSelect.setVisibility(View.GONE); 
      holder.viewSelectTriangle.setVisibility(View.GONE); 
     } 

     return convertView; 
    } 
    private class ViewHolder { 
     TextView tvName; 
     View viewSelect; 
     ImageView viewSelectTriangle; 
    } 
} 

private class UpdateList implements Runnable { 

    @Override 
    public void run() { 
     // TODO Auto-generated method stub 
     districtAdapter.notifyDataSetChanged(); 
    } 

} 

}

後，我看到了問題BaseAdapter notifyDatasetChanged() called but getView() is never called。

事實證明，我的getView（）沒有被調用的問題是因爲它不可見。我的佈局xml的上部TextView的高度爲 fill_parent。因此整個視圖只能看到單個文本視圖。

解決方案是：檢查問題的佈局的圖形視圖以確保ListView可見。

我認爲這可能是問題，但我不怎麼解決它。

項目佈局的xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="48dp" 
android:orientation="vertical" > 
<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:minWidth="120dp" > 

    <TextView 
     android:id="@+id/select_district_list_item_name" 
     android:textIsSelectable="false" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentRight="true" 
     android:padding="12dp" 
     android:textColor="#333333" 
     android:textSize="16sp" /> 

    <View 
     android:id="@+id/select_district_list_item_selected_underline" 
     android:layout_width="match_parent" 
     android:layout_height="2dp" 
     android:layout_alignBottom="@id/select_district_list_item_name" 
     android:background="#A9CF38" /> 

    <ImageView 
     android:id="@+id/select_district_list_item_selected_triangle" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_above="@id/select_district_list_item_selected_underline" 
     android:layout_alignParentRight="true" 
     android:contentDescription="@string/app_name" 
     android:src="@drawable/select_district_selected_triangle" /> 
</RelativeLayout> 
</LinearLayout>

來源

2013-06-23 chops

向我們展示代碼.. –

我剛剛複製了我的代碼！幫我...... – chops

只是好奇，是你擴展ViewGroup的原因嗎？ – pskink

解決：這個問題是奇怪的。當我想刷新listView時，我調用adapter.notifyDataSetChanged()方法，然後調用ListView.requestFocusFromTouch()方法。這對我有用。

下面是代碼：

adapter.notifyDataSetChanged(); 
listView.requestFocusFromTouch(); 
backBtn.requestFocusFromTouch();// it is requred too. backBtn is other view in your layout

有人能解釋一下嗎？

來源

2013-06-28 05:32:13 chops

listVIew中的自定義BaseAdapter無法通知數據集更改

回答

相關問題