GridView项目是不可选片段

Question

我有Fragment在Activity，我试图显示一个自定义适配器的GridView`。我能够显示GridView，但无法选择网格视图中的任何项目，任何人都可以帮助我找出问题。请找到我使用的代码

//MainActivity 

package com.example.frag; 

import java.util.ArrayList; 
import android.app.Activity; 
import android.app.ActionBar; 
import android.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.GridView; 
import android.os.Build; 

public class MainActivity extends Activity { 



    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     if (savedInstanceState == null) { 
      getFragmentManager().beginTransaction() 
        .add(R.id.container, new PlaceholderFragment()).commit(); 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 
     GridView optionsGridView; 
     ArrayList<InfoItems> items = new ArrayList<InfoItems>(); 
     OptionsAdapter adapter; 
     String items2[] = {"1","2","3","4"}; 

     public PlaceholderFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_main, container, 
        false); 
//   implentation of display of options in GridView 

      optionsGridView = (GridView) rootView.findViewById(R.id.optionsGrid); 

      /*items.add(new InfoItems("Passport")); 
      items.add(new InfoItems("Aadhar")); 
      items.add(new InfoItems("Pan")); 
      items.add(new InfoItems("DL"));*/ 




      adapter = new OptionsAdapter(this.getActivity(), items2); 

      optionsGridView.setAdapter(adapter); 
      return rootView; 
     } 
    } 
} 


Custom Adapter 

package com.example.frag; 

import java.util.ArrayList; 
import dalvik.bytecode.OpcodeInfo; 

import android.app.Activity; 
import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.TextView; 

public class OptionsAdapter extends BaseAdapter{ 
    private Context context; 
    private ArrayList<InfoItems> infoItems; 
    String items[]; 

    public OptionsAdapter(Context context,ArrayList<InfoItems> items) { 
     // TODO Auto-generated constructor stub 
     this.context = context; 
     this.infoItems = items; 
    } 

    public OptionsAdapter(Context contsxt,String txt[]) { 
     // TODO Auto-generated constructor stub 
     this.context = contsxt; 
     this.items = txt; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return items.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return infoItems.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 

     if(convertView == null){ 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.info_options, null); 
     } 

     TextView option = (TextView) convertView.findViewById(R.id.optionsItem); 
     option.setText(items[position]); 

     return convertView; 
    } 

} 


    fragment xml -- layout which will be displayed in the fragment 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.frag.MainActivity$PlaceholderFragment" > 

    <GridView android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/optionsGrid" 
     android:horizontalSpacing="5dp" 
     android:verticalSpacing="5dp" 
     android:numColumns="2" 
     android:gravity="center" 
     android:layout_marginTop="10dp"/> 


</RelativeLayout> 

item xml -- list item of the custom adapter 

<?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="match_parent" 
    android:orientation="vertical" 
    android:background="#000" 
    android:clickable="true"> 

    <TextView android:layout_width="100dp" 
     android:layout_height="100dp" 
     android:layout_margin="10dp" 
     android:gravity="center" 
     android:textColor="#f000ff" 
     android:textSize="20sp" 
     android:textStyle="bold" 
     android:id="@+id/optionsItem" 
     android:text="passport" 
     android:clickable="true" 
     android:layout_gravity="center"/> 

</LinearLayout> 

Answer 1

Squonk是正确的，您需要调用optionsGridView.setAdapter（new OnItemClickListener ....）。你也可以在片段中实现OnItemClickListener，并调用optionsGridView.setAdapter（this）。