將按鈕添加到expendableListView去年兒童

Question

我需要幫助的以下問題：

有沒有辦法添加在「expendableListView」一個按鈕，最後一個孩子？

的按鈕應該是下面的 「短文本」 字段。

如果您需要更多信息，請留下評論，我會提供。

Answer 1

您的ExpandableListView應該支持一些數據模型。在每個列表項行中，您將在View（TextView或Button）中顯示文本。所以首先讓自己保留此信息類：

public class RowData { 
    public static final int TYPE_TEXT = 0; 
    public static final int TYPE_BUTTON = 1; 
    private String label; 
    private int type; 

    public RowData(String label, int type) { 
     this.label = label; 
     this.type = type; 
    } 

    public RowData(String label) { 
     this.label = label; 
    } 

    public String getLabel() { 
     return label; 
    } 

    public int getType() { 
     return type; 
    } 

} 

最簡單的模型（因爲我們沒有你的代碼的理解），將是一個LinkedHashMap<String, List<RowData>>。密鑰是指組數據（「00010」，「00020」，「00030」等），而附加到這些密鑰的每個值指的是組子組（例如「00010」），您將擁有[「Material Group：No信息發現「等）]。現在，在您的活動保持對它的引用這個數據模型：

private Map<String, List<RowData>> myData = new LinkedHashMap<String, List<RowData>>(); 

你需要保持到ExpandableListView的適配器參考：

private BaseExpandableListAdapter adapter = new CustomSpecificAdapter(yourActivityContext, myData); 

當你需要添加額外的領域，你只要加入它的數據模型對象：

myData.get("00010").add(new RowData("Button value", RowData.TYPE_BUTTON)); 

或用於TextView： myData.get（ 「00010」）添加（新RowData（ 「TextView的值」））;。 並通知適配器：

adapter.notifyDataSetChanged(); 

這將更新可展開列表。但是，您需要爲每行指定您將擁有的視圖類型，您對每個位置的類型，因爲這與視圖回收非常相關。所以，你的相關CustomSpecificAdapter方法可能看起來是這樣的：public class CustomSpecificAdapter extends BaseExpandableListAdapter

private LinkedHashMap<String, List<RowData>> modelData; 
private Context context; 

public CustomSpecificAdapter(Context context, LinkedHashMap<String, List<RowData>> modelData) { 
    this.context = context; 
    this.modelData = modelData; 
} 

private RowData getMyDataObj(int groupPosition, int childPosition) { 
    /** 
    * safe to do this since we are using a LinkedHashMap 
    * */ 
    List<List<RowData>> children = new ArrayList<List<RowData>>(modelData.values()); 
    return children.get(groupPosition).get(childPosition); 
} 

@Override 
public Object getChild(int groupPosition, int childPosition) { 
    return getMyDataObj(groupPosition, childPosition); 
} 

@Override 
public int getChildTypeCount() { 
    /** 
    * since you will have a button and a textview there will be 2 types of views 
    * */ 
    return 2; 
} 

@Override 
public int getChildType(int groupPosition, int childPosition) { 
    RowData data = getMyDataObj(groupPosition, childPosition); 
    if (data.getType() == RowData.TYPE_TEXT) { 
     return 0; 
    } 
    // for button 
    return 1; 
} 

@Override 
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { 
    /** 
    * this is the intersting part 
    * */ 
    RowData data = getMyDataObj(groupPosition, childPosition); 
    TextView myTv = null; 
    if(convertView == null) { 
     if(data.getType() == RowData.TYPE_BUTTON) { 
      convertView = // inflate from button layout, in fact it's best to have only a <Button ... /> in the XML layout 
     } else { 
      convertView = // inflate from TextView layout, in fact it's best to have only a <Button ... /> in the XML layout 
     } 
    } 
    /** 
    * Have the same id for both TextView and Button - Button extends from TextView and so setText() method is available through polimorphysm. Also no need for ViewHolder as getViewById() will refer to itself. 
    * */ 
    myTv = (TextView) convertView.findViewById(the_same_id_in_both_xml_files); 
    myTv.setText(data.getLabel()); 
    return convertView; 
} 

Answer 2

有沒有一種方法來添加一個按鈕，最後一個孩子在 「expendableListView」？

我相信是的，你應該爲你需要的組中的最後一個孩子膨脹另一個視圖（包含按鈕的視圖）。

事情是這樣的：

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, 
      View convertView, ViewGroup parent) { 

    if (convertView == null) { 
     if(groupPosition == FIRST_GROUP_POSITION && isLasChild){ 
      convertView = inflater.inflate(R.layout.child_layout_with_buttons, null);    
     }else{ 
      convertView = inflater.inflate(R.layout.normal_child_layout, null); 
     } 
    } 
    //.... 
} 

Answer 3

首先，你需要實現自己的ExpandableListAdapter，並實現getChildView控制每個子行的看法。試試這個：

@Override 
     public View getChildView(int groupPosition, int childPosition, 
       boolean isLastChild, View convertView, ViewGroup parent) { 
      View view = convertView; 
      if(view == null){ 

       if(isLastChild){ 
        view = getLayoutInflater().inflate(R.layout.item_with_button, null); 
       }else{ 
        view = getLayoutInflater().inflate(R.layout.item, null); 
       } 
      } 
      return view; 
     } 

希望這會有所幫助。