getFragmentManager（）內

Question

類

我試圖getFragmentManager內部類來說明我的dialogFragment但它扔錯誤...：

java.lang.ClassCastException：example.MyApplication不能轉換爲android.app .Activity

，這裏是我的滿級：

public class ExpandableListAdapter extends BaseExpandableListAdapter { 

private Context _context; 
private List<String> _listDataHeader; // header titles 
// child data in format of header title, child title 
private HashMap<String, List<String>> _listDataChild; 
private static final String TAG = "ExpandableListAdapter"; 
Activity activity; 

public ExpandableListAdapter(Context context, List<String> listDataHeader, 
          HashMap<String, List<String>> listChildData) { 
    this._context = context; 
    this._listDataHeader = listDataHeader; 
    this._listDataChild = listChildData; 

} 

@Override 
public Object getChild(int groupPosition, int 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(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.list_item, null); 
    } 

    TextView txtListChild = (TextView) convertView 
      .findViewById(R.id.viewEmployee); 


    txtListChild.setText(childText); 
    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.employeeType); 
    TextView addEmpolyee = (TextView) convertView.findViewById(R.id.addEmployee); 
    addEmpolyee.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      activity = (Activity) _context; 
      DataEntryEmpolyee empolyee = new DataEntryEmpolyee(); 
      empolyee.show(activity.getFragmentManager(), "DIALOG_FRAGMENT"); 
     } 
    }); 

    lblListHeader.setTypeface(null, Typeface.BOLD); 
    lblListHeader.setText(headerTitle); 

    return convertView; 
} 

@Override 
public boolean hasStableIds() { 
    return false; 
} 

@Override 
public boolean isChildSelectable(int groupPosition, int childPosition) { 
    return true; 
} 

} 

Answer 1

你可能會傳遞錯誤的情況下在您的適配器。在應用程序上下文中使用活動的上下文。

在活動

new ExpandableListAdapter(YourActivity.this,yourList,yourHashMap); 

在片段

new ExpandableListAdapter(getActivity(),yourList,yourHashMap); 

Answer 2

嘗試使用取決於在其中創建適配器對象的類YourActivity.this或的getContext（）或getActivity（）替換getApplicationContext。

E.g.

new ExpandableListAdapter(YourActivity.this, listDataHeader, listChildData);