如何從可擴展列表視圖中獲取某些孩子？

我正在開發一個Android應用程序來下訂單，我有一個Expandable ListView的活動，我通過解析一個JSON文件來填充它。現在，在Expandable ListView的每一行中，我都有一個用於輸入金額的EditText字段，並且在按鈕單擊時，我希望在EditText字段中獲取所有值不等於0的子元素，並將數據放入數據庫中（對於已訂購的產品和金額）。如何從可擴展列表視圖中獲取某些孩子？

我需要幫助創建一個函數來獲取這些元素，因爲我最近一直在努力。這裏是我的代碼

擴展列表適配器：

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<Artikl>> _listDataChild; 

    public ExpandableListAdapter(Context context, List<String> 
listDataHeader, 
           HashMap<String, List<Artikl>> 
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; 
    } 

    public int getChildAmount(int groupPosition, int childPosition,View 
    convertView) { 

     int kolicina; 
     if (convertView == null) { 
      LayoutInflater infalInflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = infalInflater.inflate(R.layout.list_item, null); 
     } 

     EditText amount = (EditText) 
convertView.findViewById(R.id.editText); 
     kolicina=Integer.parseInt(amount.getText().toString()); 

     return kolicina; 


    } 

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

     final Artikl child = (Artikl) getChild(groupPosition, 
childPosition); 
     final String childText = child.getNaziv(); 


     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.from_name); 


     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.lblListHeader); 
     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; 
    }}

List_item.xml

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:paddingTop="2.5dp" 
    android:paddingBottom="2.5dp" 
    android:paddingLeft="5dp" 
    android:paddingRight="5dp"> 

    <RelativeLayout 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:background="#fff" 
     android:orientation="horizontal" 
     android:padding="10dp" > 



     <TextView 
      android:id="@+id/from_name" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentTop="true" 
      android:layout_toRightOf="@+id/thumbnail" 
      android:text="Pineapple" 
      android:textColor="#040404" 
      android:textSize="15dip" 
      android:typeface="sans" /> 

     <LinearLayout 
      android:id="@+id/cart_plus_minus_layout" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_alignParentRight="true" 
      android:layout_below="@+id/from_name" 
      android:orientation="horizontal" 
      android:weightSum="1"> 


      <TextView 
       android:id="@+id/cena_view" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center_horizontal|center_vertical" 
       android:paddingRight="25dip" 
       android:text="100 gm" 
       android:textColor="#343434" 
       android:textSize="12dip" /> 

      <TextView 
       android:text="Amount" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:id="@+id/textView" /> 

      <EditText 
     android:layout_width="48dp" 
     android:layout_height="66dp" 
     android:inputType="textPersonName" 
       android:ems="10" 
     android:layout_alignParentBottom="true" 
     android:layout_toRightOf="@+id/from_name" 
     android:layout_toEndOf="@+id/from_name" 
     android:layout_marginLeft="21dp" 
     android:layout_marginStart="21dp" 
     android:id="@+id/editText" 
     android:layout_weight="0.08" 
       android:hint="0" 
       android:text="0" /> 

     </LinearLayout> 

     </RelativeLayout> 

     </LinearLayout>

ListGroup.xml

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:padding="8dp" 
    android:background="#0a2859"> 


    <TextView 
     android:id="@+id/lblListHeader" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:paddingLeft="? 
    android:attr/expandableListPreferredItemPaddingLeft" 
     android:textSize="17dp" 
     android:textColor="#ffffff" /> 

    </LinearLayout>

訂購活動佈局：

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" 
    android:background="#f4f4f4" > 

    <TextView android:layout_width="fill_parent" 
     android:layout_height="70dp" 
     android:id="@+id/market_dolg" 
     android:background="#8090aa" 
     android:textColor="@android:color/white" 
     android:textSize="18dp" 
     android:text="Hello!" 
     android:gravity="center"/> 

    <ExpandableListView 
     android:id="@+id/lvExp" 
     android:layout_height="wrap_content" 
     android:layout_width="fill_parent" 
     android:layout_below="@id/market_dolg" 
     android:layout_weight="1"/> 


    <Button 
    android:layout_width="wrap_content" 
    android:layout_height="50dp" 
    android:layout_below="@id/lvExp" 
    android:id="@+id/otkazi" 
    android:background="#9ea6a8" 
    android:textColor="@android:color/white" 
    android:textSize="18dp" 
    android:text="Cancel Order" 
    android:onClick="Otkazi_nar" 
    android:gravity="center" 
    android:layout_alignParentLeft="true" 
    android:orientation="horizontal" 

    /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="50dp" 
     android:layout_below="@id/lvExp" 
     android:id="@+id/order" 
     android:background="#3fa5ba" 
     android:textColor="@android:color/white" 
     android:textSize="18dp" 
     android:text="Order" 
     android:gravity="center" 
     android:layout_alignParentRight="true" 
     android:orientation="horizontal" 

     /> 

    </RelativeLayout>

訂單活動的Java代碼：

public class Order extends Activity { 


private static final String TAG = Order.class.getSimpleName(); 
private static final String url = "artikli.json"; 
ExpandableListAdapter listAdapter; 
ExpandableListView expListView; 
List<String> listDataHeader; 
public List<Artikl> voda = new ArrayList<Artikl>(); 
public List<Artikl> sok = new ArrayList<Artikl>(); 

HashMap<String, List<Artikl>> listDataChild; 

Button button; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_naracka); 

    // get the listview 
    expListView = (ExpandableListView) findViewById(R.id.lvExp); 

    // preparing list data 
    prepareListData(); 

    listAdapter = new ExpandableListAdapter(this, listDataHeader, 
listDataChild); 

    // setting list adapter 
    expListView.setAdapter(listAdapter); 

    // Listview Group click listener 
    expListView.setOnGroupClickListener(new OnGroupClickListener() { 

     @Override 
     public boolean onGroupClick(ExpandableListView parent, View v, 
            int groupPosition, long id) { 

      return false; 
     } 
    }); 


} 

/* 
* Preparing the list data 
*/ 
private void prepareListData() { 
    listDataHeader = new ArrayList<String>(); 
    listDataChild = new HashMap<String, List<Artikl>>(); 

    // Adding child data 
    listDataHeader.add("Вода"); 
    listDataHeader.add("Сок"); 


    // Adding child data 

    JsonArrayRequest Req = new JsonArrayRequest(url, 
      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 
        Log.d(TAG, response.toString()); 


        // Parsing json 
        for (int i = 0; i < response.length(); i++) { 
         try { 

          JSONObject obj = response.getJSONObject(i); 
          String sifra = obj.getString("sifra"); 

          if (sifra.equals("1")) { 
           Artikl artikl = new Artikl(); 
           artikl.setNaziv(obj.getString("naziv")); 
           artikl.setCena(obj.getInt("cena")); 

           artikl.setSifra(sifra); 
           artikl.setEdm(obj.getString("edm")); 

           voda.add(artikl); 
          } 

         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 

        } 

       } 
      }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 


     } 
    }); 

    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(Req); 


    JsonArrayRequest Req1 = new JsonArrayRequest(url, 
      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 
        Log.d(TAG, response.toString()); 


        // Parsing json 
        for (int i = 0; i < response.length(); i++) { 
         try { 

          JSONObject obj = response.getJSONObject(i); 
          String sifra = obj.getString("sifra"); 
          if (sifra.equals("2")) { 
           Artikl artikl1 = new Artikl(); 
           artikl1.setNaziv(obj.getString("naziv")); 
           artikl1.setCena(obj.getInt("cena")); 
           artikl1.setSifra(obj.getString("sifra")); 
           artikl1.setEdm(obj.getString("edm")); 

           sok.add(artikl1); 
          } 

         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 

        } 

       } 
      }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 


     } 
    }); 

    AppController.getInstance().addToRequestQueue(Req1); 


    listDataChild.put(listDataHeader.get(0), voda); 
    listDataChild.put(listDataHeader.get(1), sok); 


}}

和模型（Artikl.java）只get和set方法

來源

2017-09-13 Janna

在適配器的getChildView方法添加到addTextChangedListener EDITTEXT和afterTextChanged方法保存輸入文本在數據庫中，如果你想獲得唯一編號，然後限制了鍵盤上的數字

mEtReference.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { 
     } 

     @Override 
     public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { 

     } 

     @Override 
     public void afterTextChanged(Editable editable) { 
      if (editable.length() > 0) { 
       int value = Integer.parseInt(editable + ""); 
       // save value 
      } 
     } 
    });

來源

2017-09-13 12:44:53

，而不是mEtReference把你EDITTEXT –

但問題是，應該有取消訂單的可能性，這就是爲什麼我想將數據保存在「訂單」按鈕單擊...有可能我可以將數據保存在其他數據結構中，然後將其傳遞給其他數據結構活動？ – Janna

取消訂單意味着您要從編輯文本中刪除輸入的值，然後在afterTextChanged方法if（editable.length（）> 0）int value = Integer.parseInt（editable +「」）; //保存值 }其他{// //在此處刪除值 } –

如何從可擴展列表視圖中獲取某些孩子？

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