对listview item加监听，单击跳转新得activity报空指针错误，value值明明放在intent里了，还是空指针错误
mainavtivity：
public class MainActivity extends Activity {
private List listNews;
private ListView list;
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch (msg.what) {
case GetXmlAndParse.PARSESUCCWSS:
listNews = (List) msg.obj;
initData();
break;
}
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.list);
GetXmlAndParse getXmlAndParse = new GetXmlAndParse(mHandler);
getXmlAndParse.getXml();
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
switch (parent.getId())
{
case R.id.list:
expressItemClick(position);//position 代表你点的哪一个
break;
}
}
private void expressItemClick(int position) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainActivity.this,NewsActivity.class);
Map<String, String> item = (Map<String, String>) list.getAdapter().getItem(position);
String essay = item.get("description");
//添加到intent域中
intent.putExtra("description",essay );
startActivity(intent);
finish();
}});
}
/**
* 将解析后的xml填充到ListView
*/
protected void initData() {
// TODO Auto-generated method stub
List items = new ArrayList();
for (News news : (List<News>)listNews) {
Map item = new HashMap();
item.put("title", news.getTitle());
item.put("description", news.getDescription());
items.add(item);
}
SimpleAdapter adapter = new SimpleAdapter(this, items, R.layout.news_view,
new String[] { "title" }, new int[] { R.id.textView1 });
list.setAdapter(adapter);
}
}
newsactivity：
public class NewsActivity extends Activity {
private TextView myTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
String value = intent.getStringExtra("description");
myTextView = (TextView) findViewById(R.id.textview2);
//
myTextView.setText(value);
}
}
