Android 不幸的是，当我使用Eclipse在emulator中启动我的应用程序时，Myapp已经停止

MainActivity.java//这是我的主要java活动文件

当我启动这个程序时，我会很不幸地发现Myapp停止了，所以我认为这是NULLPOINTER异常，但我仍然无法修复它 所以请大家帮帮我

activity_main.xml
<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.news.MainActivity" >

   <ListView 
       android:id="@+id/list1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_alignParentTop="true"
       android:layout_alignParentLeft="true">

   </ListView>
</RelativeLayout>

---

getView方法不正确。请按以下方式更改getView：

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

      ViewHolder view;

            if(convertView==null)
            {
                view = new ViewHolder();
                convertView=inflater.inflate(R.layout.single_row,null);
                view. textView=(TextView)convertView.findViewById(R.id.title);

                view.imageView=(ImageView)convertView.findViewById(R.id.list_image);


                convertView.setTag(view);
            }
            else
            {
                view = (ViewHolder) convertView.getTag();
            }

            view.textView.setText(data[position]);
            view.imageView.setImageResource(image_id[position]);

            return convertView;

        }

        public static class ViewHolder
        {
            public TextView textView;
            public ImageView imageView;
        }
}

另外，在适配器构造中初始化充气机：

---

要正确理解listview的回收机制，您必须查阅。

但是，先生，当我没有在listview上使用evenhalders时，它工作正常，可以用它们的名称视图显示图像

activity_main.xml
<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.news.MainActivity" >

   <ListView 
       android:id="@+id/list1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_alignParentTop="true"
       android:layout_alignParentLeft="true">

   </ListView>
</RelativeLayout>

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

      ViewHolder view;

            if(convertView==null)
            {
                view = new ViewHolder();
                convertView=inflater.inflate(R.layout.single_row,null);
                view. textView=(TextView)convertView.findViewById(R.id.title);

                view.imageView=(ImageView)convertView.findViewById(R.id.list_image);


                convertView.setTag(view);
            }
            else
            {
                view = (ViewHolder) convertView.getTag();
            }

            view.textView.setText(data[position]);
            view.imageView.setImageResource(image_id[position]);

            return convertView;

        }

        public static class ViewHolder
        {
            public TextView textView;
            public ImageView imageView;
        }
}

 LayoutInflater inflater;
 public Customlistadapter(Activity context,int[] image_id2, String[] text){
     super(context, R.layout.single_row,text);
     // TODO Auto-generated constructor stub
     this.data=text;
     this.image_id=image_id2;
     this.context=context;
     inflater = LayoutInflater.from(this.context);
     }