我刚刚为Fedor的LazyLoading ListView实现了GSON。这意味着应用程序通过ImageLoader类将下载的图像和文本从网络保存到外部存储器。Android:使GSON的LazyLoading ListView可以在没有互联网的情况下使用
我想知道为什么如何使这个列表视图没有互联网连接访问。 在这里,我给你我的ListView类的一个片段:
public class ProjectsList extends Activity {
ListView lstTest;
ProjectAdapter arrayAdapter;
ArrayList<Project> prjcts=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.projects_list);
//Initialize ListView
lstTest= (ListView)findViewById(R.id.lstText);
prjcts = new ArrayList<Project>();
arrayAdapter = new ProjectAdapter(ProjectsList.this, R.layout.listitems,prjcts,ProjectsList.this);
lstTest.setAdapter(arrayAdapter);
if (isOnline())
{
WebService webService = new WebService("http://liebenwald.spendino.net/admanager/dev/android/projects.json");
Map<String, String> params = new HashMap<String, String>();
params.put("var", "");
String response = webService.webGet("", params);
try
{
Type collectionType = new TypeToken<ArrayList<Project>>(){}.getType();
List<Project> lst= new Gson().fromJson(response, collectionType);
for(Project l : lst)
{
prjcts.add(l);
ConstantData.projectsList.add(l);
}
arrayAdapter.notifyDataSetChanged();
}
catch(Exception e)
{
Log.d("Error: ", e.getMessage());
}
}
lstTest.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent care = new Intent(ProjectsList.this, ProjectDetail.class);
care.putExtra("spendino.de.ProjectDetail.position",position);
startActivity(care);
}
});
}
@Override
public void onDestroy()
{
yAdapter.imageLoader.stopThread();
lstTest.setAdapter(null);
super.onDestroy();
}
protected boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected()) {
return true;
} else {
}
});
return false;
}
}
}
如果更多的我的代码需要请指教。 感谢
只要在这里写你的代码'catch(Exception e) { //你的代码,,,,,,,} – 2011-05-16 10:10:30
我应该在哪写这个?在onCreate内? – hectichavana 2011-05-16 10:11:46
是的,在'OnCreate'里面..当你没有从你的web服务器得到任何回应时。只要做你想做的事情。 – 2011-05-16 10:44:25