错误日志：
06-28 12:07:38.227: E/AndroidRuntime(1199): FATAL EXCEPTION: main
06-28 12:07:38.227: E/AndroidRuntime(1199): java.lang.NullPointerException
06-28 12:07:38.227: E/AndroidRuntime(1199): at com.innoventes.cpea.view.DashboardAdapter.getView(DashboardAdapter.java:55)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.AbsListView.obtainView(AbsListView.java:1409)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.ListView.makeAndAddView(ListView.java:1745)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.ListView.fillSpecific(ListView.java:1290)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.ListView.layoutChildren(ListView.java:1576)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.AbsListView.onLayout(AbsListView.java:1260)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.view.View.layout(View.java:7175)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1254)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1130)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.LinearLayout.onLayout(LinearLayout.java:1047)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.view.View.layout(View.java:7175)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.FrameLayout.onLayout(FrameLayout.java:338)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.view.View.layout(View.java:7175)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.widget.FrameLayout.onLayout(FrameLayout.java:338)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.view.View.layout(View.java:7175)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.view.ViewRoot.performTraversals(ViewRoot.java:1140)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.os.Handler.dispatchMessage(Handler.java:99)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.os.Looper.loop(Looper.java:130)
06-28 12:07:38.227: E/AndroidRuntime(1199): at android.app.ActivityThread.main(ActivityThread.java:3683)
06-28 12:07:38.227: E/AndroidRuntime(1199): at java.lang.reflect.Method.invokeNative(Native Method)
06-28 12:07:38.227: E/AndroidRuntime(1199): at java.lang.reflect.Method.invoke(Method.java:507)
06-28 12:07:38.227: E/AndroidRuntime(1199): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-28 12:07:38.227: E/AndroidRuntime(1199): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-28 12:07:38.227: E/AndroidRuntime(1199): at dalvik.system.NativeStart.main(Native Method)
我的适配器：
public class DashboardAdapter extends ArrayAdapter<ProductModel>{
Context context;
List<ProductModel> item;
public DashboardAdapter(Context context, int resourceId,List<ProductModel> items)
{
super(context, resourceId, items);
this.context = context;
this.item = items;
}
/*private view holder class*/
private class ViewHolder
{
ImageButton rightCaret;
TextView txtTitle;
}
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = new ViewHolder();
ProductModel rowItem = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.dashboard_item,parent,false);
holder = new ViewHolder();
holder.txtTitle = (TextView) convertView.findViewById(R.id.dashboardItem_description);
holder.rightCaret = (ImageButton) convertView.findViewById(R.id.rightCaretDash);
holder.rightCaret.setTag(position);
holder.txtTitle.setText(rowItem.getProductTitle());
convertView.setTag(holder);
holder.rightCaret.setClickable(true);
holder.rightCaret.setId(position);
DashboardAdapter.this.notifyDataSetChanged();
}
holder.rightCaret.setOnClickListener(new View.OnClickListener()
{
public void onClick(final View view)
{
Integer index = (Integer) view.getTag();
String header = item.get(index).toString();
Intent intent = new Intent(context,ListProduct.class);
intent.putExtra("value",header);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
context.startActivity(intent);
notifyDataSetChanged();
}
});
convertView.setClickable(true);
return convertView;
}
}
当我调试时，rightCaret imageButton 为空。请帮助我不知道如何走得更远。