子活動ListView更新父活動的ListView

我有一個問題，其中Child Activity的列表視圖更新了父活動的列表視圖的內容。子活動ListView更新父活動的ListView

基本上，在我父活動（DetailActivity）我有一個列表視圖叫我用下面的代碼填充lvContacts：

ListView lvDetail = (ListView)findViewById(R.id.lvContacts); 
SingleLineAdapter adapter = new SingleLineAdapter(this, Items); 
lvDetail.setAdapter(adapter); 
lvDetail.setSelector(R.drawable.generic_selector);

如果項目是GenericDataObject的ArrayList：

public class GenericDataObject implements Serializable { 
private static final long serialVersionUID = 7661717999129942666L; 
private String Id; 
private String Description; 
private String RawData; 

// getters and setters snipped for smaller code 
}

SingleLineAdapter看起來像這樣：

public class SingleLineAdapter extends CustomListAdapter implements Filterable { 
private static ArrayList<GenericDataObject> ObjectArray; 
private static ArrayList<GenericDataObject> OriginalArray; 
private LayoutInflater layoutInflater; 
private String SearchedText = ""; 
private Context OriginatingContext; 

public SingleLineAdapter(Context context, ArrayList<GenericDataObject> Objects) { 
    OriginatingContext = context; 
    ObjectArray = Objects; 
    OriginalArray = Objects; 
    layoutInflater = LayoutInflater.from(context); 
    if (Objects != null) 
     Collections.sort(Objects, ObjectComparator); 
} 

private Comparator<GenericDataObject> ObjectComparator = new Comparator<GenericDataObject>() { 
    @Override 
    public int compare(GenericDataObject object1, 
      GenericDataObject object2) { 
     return object1.getDescription().compareTo(object2.getDescription()); 
    } 
}; 

@Override 
public int getCount() { 
    return ObjectArray.size(); 
} 

@Override 
public Object getItem(int position) { 
    return ObjectArray.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    ViewHolder holder; 
    if (convertView == null) { 
     convertView = layoutInflater.inflate(R.layout.listitem_generic, null); 
      holder = new ViewHolder(); 
      holder.lblTitle = (TextView)convertView.findViewById(R.id.lblTitle); 

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

    holder.lblTitle.setText(ObjectArray.get(position).getDescription(), TextView.BufferType.SPANNABLE); 

    if (!SearchedText.equals("")) { 
     Spannable wordToSpan = (Spannable)holder.lblTitle.getText(); 
     String[] comps; 
     if (SearchedText.startsWith("\"")) 
      comps = new String[] { SearchedText.substring(1, SearchedText.length() - 1) }; 
     else 
      comps = SearchedText.split(" "); 

     String name = holder.lblTitle.getText().toString().toLowerCase(); 
     for(int i = 0; i < comps.length; i++) { 
      int Start = name.indexOf(comps[i]); 
      while (Start > -1) { 
       int End = Start + comps[i].length(); 
       wordToSpan.setSpan(new BackgroundColorSpan(0xFFFF9900), Start, End, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
       Start = name.indexOf(comps[i], End); 
      } 
     } 
    } 
    setFont(holder.lblTitle); 

    return convertView; 
} 

static class ViewHolder { 
    TextView lblTitle; 
} 

@Override 
public Filter getFilter() { 
    return new Filter() { 

     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      SearchedText = constraint.toString(); 
      final FilterResults result = new FilterResults(); 

      final ArrayList<GenericDataObject> custs = new ArrayList<GenericDataObject>(); 
      if(constraint != null) { 
       String[] searches; 
       if (constraint.toString().startsWith("\"") && constraint.toString().endsWith("\"")) 
        searches = new String[] { SearchedText.substring(1, SearchedText.length() - 1) }; 
       else 
        searches = constraint.toString().split(" "); 
       for(int i = 0; i < OriginalArray.size(); i++) { 
        String customerName = OriginalArray.get(i).getDescription().toLowerCase(); 

        boolean bNotFound = false; 
        for(int j = 0; j < searches.length && bNotFound == false; j++) { 
         String searchFor = searches[j]; 
         if (!customerName.contains(searchFor)) 
          bNotFound = true; 
        } 

        if (!bNotFound) 
        { 
         custs.add(OriginalArray.get(i)); 
        } 
       } 
       result.values = custs; 
      } 
      return result; 
     } 

     @Override 
     @SuppressWarnings("unchecked") 
     protected void publishResults(CharSequence constraint, 
       FilterResults results) { 
      ObjectArray = (ArrayList<GenericDataObject>)results.values; 
      notifyDataSetChanged(); 
     } 
    }; 
} 
}

The OnItemClic K表示用於在web服務的數據的查詢lvContacts然後示出了新的活動：

Intent detail = new Intent(DetailActivity.this, ContactDetailActivity.class); 
detail.putExtra("ListOfDetails", RowsFromService); 
startActivity(detail);

的RowsFromService是GenericDataObject的ArrayList爲好。

在ContactDetailActivity中，我有一個名爲lvContactDetail的ListView。

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    ArrayList<GenericDataObject> DetailRows = (ArrayList<GenericDataObject>)getIntent().getExtras().getSerializable("ListOfDetails"); 
    ListView lvContactDetail = (ListView)findViewById(R.id.lvContactDetail); 
    SingleLineAdapter detailAdapter = new SingleLineAdapter(this, DetailRows); 
    lvContactDetail.setAdapter(detailAdapter); 
    lvContactDetail.setSelector(R.drawable.generic_selector); 
}

一切到這一點的作品完美，但如果我用一個按鈕返回按鈕，甚至activity.finish（）回到DetailActivity（父活動），原來的名單：我通過這個填充（lvContacts）現在填充了lvContactDetail的結果。

這隻發生在我的應用程序中的兩個列表，其餘所有工作都正常工作。

從其他列表加載列表時，是否有任何特別的注意事項需要注意？值得注意的是，我的應用程序中的主要活動爲CLEAR_TOP和REORDER_TO_FRONT設置了標誌...

足夠奇怪：即使我在子活動中註釋掉setAdapter行，父活動仍然會與其他活動一起更新數據。這可能與創建SingleLineAdapter的新實例有關嗎？

來源

2013-02-27 user1147227