指定的孩子已经有一位家长。您必须先调用子对象的父对象的removeView（）。 （与工具栏）

Question

我尝试用自定义适配器工具栏和巡航能力的IM这个错误添加微调： 指定的孩子已经有一个父。您必须先调用子对象的父对象的removeView（）。 这是我的微调适配器类：

public class SpinnerAdapter extends BaseAdapter { 
    ArrayList<ShopCartModel> list; 
    Context context; 
    LayoutInflater inflater; 

    public SpinnerAdapter (Context c , ArrayList<ShopCartModel> list){ 
     this.context = c; 
     this.list = list; 
     inflater = (LayoutInflater.from(c)); 
    } 

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

    @Override 
    public Object getItem(int position) { 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     convertView = inflater.inflate(R.layout.custom_spinner_item , null); 
     TextView name = (TextView)convertView.findViewById(R.id.textView); 
     ShopCartModel tmp = list.get(position); 
     name.setText(tmp.getName()); 
     return convertView; 
    } 
} 

，这是我的主类时，即时通讯试着微调添加到工具栏：

public class ShopCartScreen extends AppCompatActivity implements AdapterView.OnItemSelectedListener{ 
    Spinner spin; 
    ArrayList<ShopCartModel> shopCarts; 
SpinnerAdapter spinnerAdapter; 
    DBHelper db; 
    ApartmentModel apartment; 
    GetShopLists g; 
    SharedPreferences preferences; 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.shop_carts_list); 

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     getSupportActionBar().setDisplayShowTitleEnabled(false); 


     items = (ListView)findViewById(R.id.shop_carts_lists); 
     spin = (Spinner)findViewById(R.id.spinner); 
     db = DBHelper.getInstance(this); 
     preferences = getSharedPreferences("appData", 0); 
     boolean flag = preferences.getBoolean("ShopCartListsLoadedFromDB" , false); // 
     int apartmentNumber = preferences.getInt("apartmentNumber" , 0); 
     apartment = new ApartmentModel(apartmentNumber); 
     if(flag == true){ 
      shopCarts = db.getshopLists(apartment); 
      spinnerAdapter = new SpinnerAdapter(getApplicationContext(),shopCarts); 
      spin.setAdapter(spinnerAdapter); 
     } 
     else{ 
      g = new GetShopLists(this, shopCarts , spin , spinnerAdapter); 
      g.execute("this is where i set the items on the spinner"); 

      preferences = getSharedPreferences("appData", 0); 
      SharedPreferences.Editor editor = preferences.edit(); 
      editor.putBoolean("ShopCartListsLoadedFromDB" , true); 
      editor.apply(); 
     } 
toolbar.addView(spin, 0); //this is where the application crushes 

     spin.setOnItemSelectedListener(this); 

    } 

编辑：我主要的XML文件：

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

    <!--list of all shop carts of an apartment--> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:minHeight="?attr/actionBarSize" 
     android:background="#ff1e8622" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
    </android.support.v7.widget.Toolbar> 

    <LinearLayout 
     android:orientation="horizontal" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:gravity="right" 
     android:weightSum="1" 
     android:id="@+id/newList" 
     android:baselineAligned="false"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="@string/newList" 
      android:id="@+id/textView" 
      android:layout_weight="0.12" 
      android:layout_gravity="center" 
      /> 

     <ImageButton 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/imageButton" 
      android:src="@android:drawable/ic_input_add" 
      android:background="#ffffff" 
      android:layout_marginLeft="@dimen/activity_horizontal_margin" 
      android:layout_gravity="center" 
      android:onClick="createNewList" 
      /> 

    </LinearLayout> 

    <Spinner 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/spinner" /> 

    <ListView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/shop_carts_lists" 
     android:layout_gravity="center_horizontal" 
     android:layout_below="@id/newList" 
     android:paddingTop="10dp"/> 

</LinearLayout> 

and my spinner 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="horizontal"> 

    <TextView 
     android:id="@+id/textView" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center" 
     android:padding="@dimen/activity_horizontal_margin" 
     android:text="Demo" 
     android:textColor="#000" /> 
</LinearLayout> 

Answer 1

微调的Cuz在一些布局已经存在。你可以做两种类型。

1. 删除toolbar.addView(spin, 0);一行。

   或者

2. 变化喷丝初始化为..

   微调自旋=新微调（YourACtivity.this）;

并将其从布局xml中移除。