我在片段中调用列表视图，如果我注释代码lview.setOnItemClickListener，它正确显示结果。否则它会抛出异常01-03 17:51:38.381:E/AndroidRuntime(3578）：at com.example.listviewtest.Committees.onCreateView（Committees.java:90）。代码出了什么问题？
Committees .java
================
package com.example.listviewtest;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.app.Dialog;
import android.app.ListFragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;
public class Committees extends Fragment {
ListView list;
String[] web = { "Test", "Test", "Test", "Test", "Test", "Test", "Test" };
Integer[] arrowImage = { R.drawable.image1, R.drawable.image2,
R.drawable.image3, R.drawable.image4, R.drawable.image5,
R.drawable.image6, R.drawable.image7 };
com.example.listviewtest listAdapter;
ListView lView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
int Position;
int FirstTime = 1;
// final Context context = this;
private ListAdapter listAdapter1;
private ListView lview;
View convertView = null;
int web1 = 1;
String Locationname = "Test";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
// View view = inflater.inflate(R.layout.outagereport, container,
// false);
View view = inflater.inflate(R.layout.committees, container, false);
listAdapter = new FedStateCommList(getActivity(), arrowImage.length,
arrowImage, web);
lView = (ListView) view.findViewById(R.id.FedStateComm);
lView.setAdapter(listAdapter);
lview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(), "Inside Item Clicked",
Toast.LENGTH_SHORT).show();
}
});
return view;
}
}
committees.xml ===============
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/FedStateCommitte"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#04B486"
android:scaleType="fitXY" >
<ListView
android:id="@+id/FedStateComm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:gravity="center"
android:layout_marginLeft="0dp"
android:divider="#ffffff"
android:dividerHeight="4dp"
>
</ListView>
</RelativeLayout>
</FrameLayout>
federalstatecommitteelist.xml ==============================
<?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:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false">
<ImageButton
android:id="@+id/FedState"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:layout_alignParentRight="true"
android:src="@drawable/ic_launcher"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false"
android:descendantFocusability="blocksDescendants" />
<TextView
android:id="@+id/fedStateCom"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_centerVertical="true"
android:gravity="center"
android:layout_weight="1"
android:text="Medium Text"
android:textColor="#ffffff"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false"/>
</RelativeLayout>
FedStateCommList.java
=====================
package com.example.listviewtest;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
public class FedStateCommList extends ArrayAdapter<String> {
private final Activity context;
private final int web;
private final Integer[] arrowImage;
private final String [] Title;
ImageButton imageButton;
//private final Integer[] imageId;
public FedStateCommList(Activity context,
int web,Integer [] arrowImage,String [] Title) {
super(context,web);
this.context = context;
this.web = web;
this.arrowImage = arrowImage;
this.Title = Title;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View convertView= inflater.inflate(R.layout.federalstatecommitteelist, parent, false);
TextView lblListHeader = (TextView) convertView.findViewById(R.id.fedStateCom);
ImageButton arrowimage = (ImageButton) convertView.findViewById(R.id.FedState);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setTextColor(Color.WHITE);
lblListHeader.setText(Title[position]);
arrowimage.setImageResource(arrowImage[position]);
arrowimage.setFocusable(false);
return convertView;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return web;
}
@Override
public boolean isEnabled(int position)
{
return true;
}
}
我只使用了它。但我仍然得到例外和细节......
01-03 18:52:07.012: E/AndroidRuntime(3966): FATAL EXCEPTION: main
01-03 18:52:07.012: E/AndroidRuntime(3966): java.lang.NullPointerException
01-03 18:52:07.012: E/AndroidRuntime(3966): at com.example.listviewtest.Committees.onCreateView(Committees.java:90)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.os.Handler.handleCallback(Handler.java:605)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.os.Handler.dispatchMessage(Handler.java:92)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.os.Looper.loop(Looper.java:137)
01-03 18:52:07.012: E/AndroidRuntime(3966): at android.app.ActivityThread.main(ActivityThread.java:4340)
01-03 18:52:07.012: E/AndroidRuntime(3966): at java.lang.reflect.Method.invokeNative(Native Method)
01-03 18:52:07.012: E/AndroidRuntime(3966): at java.lang.reflect.Method.invoke(Method.java:511)
01-03 18:52:07.012: E/AndroidRuntime(3966): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-03 18:52:07.012: E/AndroidRuntime(3966): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-03 18:52:07.012: E/AndroidRuntime(3966): at dalvik.system.NativeStart.main(Native Method)