我一直在谷歌搜索和搜索解决这个错误一段时间,我似乎无法找出原因以及如何解决它.

我正在使用customAdapter填写我的列表视图.我膨胀描述我的listItem的xml.我使用findViewById创建viewHolder对象并在textview中加载.之后,我想设置该textview的文本,但findViewbyid返回一个空值.所以自动解析为nullpointerexception.

适配器：

/** CLASS : Custom Adapter for the listview */
private class CustomAdapter extends ArrayAdapter<Track>{
    private List<Track> items;
    private Context mContext;
    private int layoutResourceId;       
    private ViewHolder mHolder;

    public CustomAdapter(Context context, int layoutId, List<Track> objects) {
        super(context, layoutId, objects);
        layoutResourceId=layoutId;
        items = objects;
        mContext=context;       
    }       

    public View getView(int position, View convertView, ViewGroup parent) {
         if(convertView == null){
             LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
             convertView = inflater.inflate(layoutResourceId, parent, false);
             mHolder = new ViewHolder();
             ****** RETURNS NULL DURING DEBUGGING ******
             mHolder.textViewCenter = (TextView)findViewById(R.id.textview_list_item_central);
             convertView.setTag(mHolder);
         }else{
             mHolder = (ViewHolder) convertView.getTag();
         }
         Track track = items.get(position);
         ****** ERROR HAPPENS HERE ******
         mHolder.textViewCenter.setText(track.getTrack());
         return convertView;
    }

    class ViewHolder{
        ImageView imageView;
        TextView textViewCenter;
        TextView textViewRight;
    }
}

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="wrap_content"
android:orientation="horizontal" >

<ImageView
    android:id="@+id/imageview_list_albumart_icon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="left"
    android:src="@drawable/ic_music" />

<TextView
    android:id="@+id/textview_list_item_central"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_weight="0.5"
    android:text="Center"
    android:textSize="20sp" >
</TextView>

<TextView
    android:id="@+id/textview_list_item_right"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="right"
    android:paddingRight="10dip"
    android:text="Right" />

任何帮助表示赞赏！

解决方法:

在convertView中搜索您膨胀的视图(而不是像当前那样在当前的Activity布局中)：

 mHolder.textViewCenter = (TextView) 
                convertView.findViewById(R.id.textview_list_item_central);