在OnItemClickListener无法显示吐司里面片段 [英] Can not show Toast in OnItemClickListener inside Fragment

问题描述

我想在片段来创建一个的ListView 。列表视图显示正确，但是当我遵循的code会显示错误。

 进口android.app.Fragment;
    进口android.content.Context;
    进口android.os.Bundle;
    进口android.view.LayoutInflater;
    进口android.view.View;
    进口android.view.ViewGroup;
    进口android.widget.AdapterView;
    进口android.widget.ArrayAdapter;
    进口android.widget.ListView;
    进口android.widget.Toast;    公共类ServiceFragment扩展片段{
        私人的ListView serviceList;
        私有String [] serviceString;
        公共ServiceFragment（）{}
        @覆盖
        公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
         捆绑savedInstanceState）{
         查看rootView = inflater.inflate（R.layout.fragment_service，集装箱，FALSE）;           //生成列表服务
            serviceList =（ListView控件）rootView.findViewById（R.id.ServiceList）;
            serviceString = getResources（）getStringArray（R.array.service_list）。            ArrayAdapter＆LT;串GT; objAdapter =新ArrayAdapter＆LT;串GT;（this.getActivity（），android.R.layout.simple_list_item_1，serviceString）;
            serviceList.setAdapter（objAdapter）;           //上点击项侦听器
           serviceList.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
             @覆盖
             公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
                字符串itemValue =（字符串）serviceList.getItemAtPosition（位置）;
                INT itemPosition =位置;                Toast.makeText（ServiceFragment.this，位置：+ itemPosition +列表项：+ itemValue，Toast.LENGTH_LONG）.show（）;             }
          }）;         返回rootView;
        } // onCreateView结束} //类ServiceFragment结束
 

这有什么错我的code？为什么没有吐司显示？

有可能在点击项目启动活动的细节，我可以描述项目的意义

假设
列表项=苹果，芒果，香蕉
的onClick项目细节视图=苹果是一个品牌或水果，香蕉是一种水果，芒果是一个很好的水果，

解决方案

  

有什么毛病我code？为什么吐司不显示

既然你是一个片段您必须使用 getActivity（）而不是 yourClass.this 。

更改吐司来的：

  Toast.makeText（getActivity（），位置：+ itemPosition +列表项：+ itemValue，Toast.LENGTH_LONG）.show（）;
 

修改

有关细节的活动必须创建一个活动首先，让我们把它叫做 DetailActivity ，那么你必须改变你的 onItemClickListener（）来的：

  serviceList.setOnItemClickListener（新AdapterView.OnItemClickListener（）{
         @覆盖
         公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
            字符串itemValue =（字符串）serviceList.getItemAtPosition（位置）;
            INT itemPosition =位置;            Toast.makeText（getActivity（），位置：+ itemPosition +列表项：+ itemValue，Toast.LENGTH_LONG）.show（）;          意向意图=新意图（getActivity（），DetailActivity.class）;
          intent.putExtra（DetailProductClicked，itemValue）;
          startActivity（意向）;         }
      }）;
 

因此​​，在您 DetailActivity.class 你必须把这个在你的的onCreate（）

 字符串nameFruit = intent.getStringExtra（DetailProductClicked）;
 

然后，要看你对这个活动，你可以这样做的：

 如果（nameFruit.equals（苹果）{
   tv.setText（nameFruit +是一个品牌或水果）;
}
如果（nameFruit.equals（芒果）{
   tv.setText（nameFruit +是一个很好的水果）;
}
如果（nameFruit.equals（香蕉）{
   tv.setText（nameFruit +是一种水果）;
}
 

I am trying to create a ListView in a Fragment. The listView appear correctly but when I complied the code shows error.

    import android.app.Fragment;
    import android.content.Context;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import android.widget.Toast;

    public class ServiceFragment extends Fragment {
        private ListView serviceList;
        private String[] serviceString;
        public ServiceFragment(){}


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
         Bundle savedInstanceState) {
         View rootView = inflater.inflate(R.layout.fragment_service, container, false);

           //build the list service
            serviceList = (ListView) rootView.findViewById(R.id.ServiceList);
            serviceString = getResources().getStringArray(R.array.service_list);

            ArrayAdapter<String> objAdapter = new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1,serviceString );
            serviceList.setAdapter(objAdapter);

           //on click item Listener
           serviceList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
             @Override
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String  itemValue    = (String) serviceList.getItemAtPosition(position);
                int itemPosition     = position;

                Toast.makeText(ServiceFragment.this,"Position :"+itemPosition+"  ListItem : " +itemValue , Toast.LENGTH_LONG).show();

             }
          });

         return rootView;
        }//end of onCreateView

}//end of class ServiceFragment

What's wrong with my code? Why doesn't Toast show up?

is it possible on click item start a detail activity where I can describe the meaning of item

Suppose List Item = Apple ,Mango, Banana onClick Item Details view = Apple is a brand or fruit, Banana is a fruit,Mango is a good fruit,

解决方案

What Wrong with my code ? Why the Toast does not show

Since you are on a Fragment you must use getActivity() instead of yourClass.this.

Change your Toast to this :

Toast.makeText(getActivity(),"Position :"+itemPosition+" ListItem : " +itemValue , Toast.LENGTH_LONG).show();

EDIT

For a detail Activity you must create an Activity first let's call it DetailActivity then you have to change your onItemClickListener() to this :

 serviceList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
         @Override
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String  itemValue    = (String) serviceList.getItemAtPosition(position);
            int itemPosition     = position;

            Toast.makeText(getActivity(),"Position :"+itemPosition+"  ListItem : " +itemValue , Toast.LENGTH_LONG).show();

          Intent intent = new Intent(getActivity(), DetailActivity.class);
          intent.putExtra("DetailProductClicked", itemValue);
          startActivity(intent);

         }
      });

So in your DetailActivity.class you have to put this on your onCreate()

String nameFruit = intent.getStringExtra("DetailProductClicked");

Then depends what you have on this Activity you can do something like :

if (nameFruit.equals("Apple"){
   tv.setText(nameFruit +" is a brand or fruit");
}
if (nameFruit.equals("Mango"){
   tv.setText(nameFruit +" is a good fruit");
}
if (nameFruit.equals("Banana"){
   tv.setText(nameFruit +" is a fruit");
}

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