NullPointerException异常与simpleAdapter在android系统 [英] NullPointerException with simpleAdapter in android

问题描述

我使用的是simpleAdapter创建一个列表视图，但是我得到这个错误：

I am using a simpleAdapter to create a listview, however I get this error:

Caused by: java.lang.NullPointerException
at com.tab.Activity.onCreate(Activity.java:36)

和这个code，我现在用：

and this the code that I am using:

ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>();
 private SimpleAdapter notes;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout);

    notes = new SimpleAdapter( 
            this, 
            list,
            R.layout.display_layout,
            new String[] { "line1" },
            new int[] { R.id.text1}  );
   ListView lv = (ListView) findViewById(R.id.listview);
   lv.setAdapter( notes );
}

第36行是

new int[] { R.id.text1}  );

text1的定义，所以为什么我收到空指针错误？

text1 is defined, so why I am getting nullpointer error?

推荐答案

最后，我通过实施以下这个教程新SimpleAdapter解决该问题：
的http://kurtchen.com/blog/2010/07/30/use-simpleadapter-to-make-a-list-with-icons/

Finally, I solved the issue by implementing new SimpleAdapter following this tutorial: http://kurtchen.com/blog/2010/07/30/use-simpleadapter-to-make-a-list-with-icons/

我觉得问题是，ArrayList的名单变量为空，因此SimpleAdapter不能映射到R.id.text1列中的任意值。

I think the problem was that "ArrayList list" variable was null and therefore SimpleAdapter could not map any value to the "R.id.text1" column.

感谢大家对你的答案

这篇关于NullPointerException异常与simpleAdapter在android系统的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！