Android，按钮片段不工作

Question

我已经阅读了很多帖子，问题和答案，但我无法解决我的问题。它不工作。

我有一个Android Studio的Mainmenu-Activity应用程序。现在我有一些碎片被设置到容器中（通过替换）。

现在我在Fragment中添加了一个按钮，并希望它能进行一些计算。但这是问题。这个Button没有做任何事情。

这里我的代码：

package eu.terratex.terratextoolbox; 

import android.app.Activity; 
import android.net.Uri; 
import android.os.Bundle; 
import android.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.RatingBar; 
import android.view.View.OnClickListener; 
import android.widget.Spinner; 
import android.widget.TextView; 
import android.widget.Toast; 


/** 
* A simple {@link Fragment} subclass. 
* Activities that contain this fragment must implement the 
* {@link Knastrechner.OnFragmentInteractionListener} interface 
* to handle interaction events. 
* Use the {@link Knastrechner#newInstance} factory method to 
* create an instance of this fragment. 
* 
*/ 
public class Knastrechner extends Fragment { 

    private OnFragmentInteractionListener mListener; 
    private Button btnClick; 

    /** 
    * Use this factory method to create a new instance of 
    * this fragment using the provided parameters. 
    * 
    * @return A new instance of fragment Knastrechner. 
    */ 
    // TODO: Rename and change types and number of parameters 
    public static Knastrechner newInstance() { 
     Knastrechner fragment = new Knastrechner(); 
     Bundle args = new Bundle(); 
     return fragment; 
    } 
    public Knastrechner() { 
     // Required empty public constructor 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     super.onCreateView(inflater, container, savedInstanceState); 
     // Inflate the layout for this fragment 
     View view = null; 
     view = inflater.inflate(R.layout.fragment_knastrechner, container, false); 
     Button mButton = (Button) view.findViewById(R.id.berechnenButton); 


     mButton.setOnClickListener(new OnClickListener(){ 

      @Override 
      public void onClick(View view) { 
       System.out.println("abc"); 
      } 
     }); 

     return inflater.inflate(R.layout.fragment_knastrechner, container, false); 
    } 



    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     try { 
      mListener = (OnFragmentInteractionListener) activity; 
     } catch (ClassCastException e) { 
      throw new ClassCastException(activity.toString() 
        + " must implement OnFragmentInteractionListener"); 
     } 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
     mListener = null; 
    } 


    /** 
    * This interface must be implemented by activities that contain this 
    * fragment to allow an interaction in this fragment to be communicated 
    * to the activity and potentially other fragments contained in that 
    * activity. 
    * <p> 
    * See the Android Training lesson <a href= 
    * "http://developer.android.com/training/basics/fragments/communicating.html" 
    * >Communicating with Other Fragments</a> for more information. 
    */ 
    public interface OnFragmentInteractionListener { 
     // TODO: Update argument type and name 
     public void onFragmentInteraction(Uri uri); 
    } 

} 

我添加的onclick这里： @覆盖 公共查看onCreateView（LayoutInflater吹气，ViewGroup中容器， 捆绑savedInstanceState）{

super.onCreateView(inflater, container, savedInstanceState); 
    // Inflate the layout for this fragment 
    View view = null; 
    view = inflater.inflate(R.layout.fragment_knastrechner, container, false); 
    Button mButton = (Button) view.findViewById(R.id.berechnenButton); 


    mButton.setOnClickListener(new OnClickListener(){ 

     @Override 
     public void onClick(View view) { 
      System.out.println("abc"); 
     } 
    }); 

    return inflater.inflate(R.layout.fragment_knastrechner, container, false); 
} 

谁能帮助我？

Answer 1

你应该做return view;而不是做return inflater.inflate(R.layout.fragment_knastrechner, container, false);因为否则你只是放弃你以前在代码中做过的事情。

Answer 2

改变这种从

return inflater.inflate(R.layout.fragment_knastrechner, container, false); 

到

return view; 

，因为你已经在view对象虚增布局。