我正在尝试实施此库https://github.com/ShirwaM/Simplistic-RSS。
库如上所述,但我不喜欢如何处理Feed输出。基本上在主活动的私有类中,它直接调用ListView和ArrayAdapter。这意味着如果我想要两个显示两个Feed的ListView,我必须复制整个私有类。我想要做的是让它接受一个ArrayAdapater和ListView传递给它,这样我就可以关闭该类,然后只需调用它两次传递相关的feed URL和ListView输出。
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends Activity
{
private ListView mList;
private ListView lList;
ArrayAdapter<String> adapter;
ArrayAdapter<String> adapterSecond;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.rss_layout);
lList = (ListView) findViewById(R.id.listTwo);
mList = (ListView) findViewById(R.id.listOne);
adapterSecond = new ArrayAdapter<String>(this, R.layout.basic_list_item);
adapter = new ArrayAdapter<String>(this, R.layout.basic_list_item);
new GetRssFeed().execute("http://feeds.arstechnica.com/arstechnica/index");
new GetRssFeedSecond().execute("http://feeds.skynews.com/feeds/rss/home.xml");
}
private class GetRssFeed extends AsyncTask<String, Void, Void>
{
@Override
protected Void doInBackground(String... params)
{
try
{
RssReader rssReader = new RssReader(params[0]);
Integer i = 0;
for (RssItem item : rssReader.getItems())
{
adapter.add(item.getTitle());
i++;
if(i == 7)
{
break;
}
}
} catch (Exception e)
{
Log.v("Error Parsing Data", e + "");
}
return null;
}
@Override
protected void onPostExecute(Void aVoid)
{
super.onPostExecute(aVoid);
adapter.notifyDataSetChanged();
mList.setAdapter(adapter);
}
}
private class GetRssFeedSecond extends AsyncTask<String, Void, Void>
{
@Override
protected Void doInBackground(String... params)
{
try
{
RssReader rssReader = new RssReader(params[0]);
Integer i = 0;
for (RssItem item : rssReader.getItems()) {
adapter.add(item.getTitle());
i++;
if (i == 7) {
break;
}
}
} catch (Exception e)
{
Log.v("Error Parsing Data", e + "");
}
return null;
}
@Override
protected void onPostExecute(Void aVoid)
{
super.onPostExecute(aVoid);
adapterSecond.notifyDataSetChanged();
lList.setAdapter(adapterSecond);
}
}
}
正如您所看到的,因为GetRssFeed
是使用Adapter和ListView进行硬编码的,根据Simplistic-RSS示例代码,我需要创建两个GetRssFeed
类来生成两个不同的ListView。我想这样做,所以我有一个GetRssFeed
我可以调用相关的Adapter和ListView传递给它。
答案 0 :(得分:1)
在GetRssFeed类中,添加一个接受2个参数url和listview的构造函数,如果要更改适配器,则添加3个参数,如下所示。
public GetRssFeed(String feedUrl, ListView listView) {
this.feedUrl = feedUrl;
this.listView = listView;
}
将GetRssFeed类中的这2个变量定义为实例变量并使用它们。
然后,从onCreate,你打电话如下,
new GetRssFeed("http://feeds.arstechnica.com/arstechnica/index", listView).execute();
您的单个AsyncTask看起来像这样,
private class GetRssFeed extends AsyncTask<String, Void, Void>
{
ListView listView;
String url;
ArrayAdapter adapter;
public GetRssFeed(String url, ListView listView, ArrayAdapter adapter) {
this.listView = listView;
this.url = url;
this.adapter = adapter;
}
@Override
protected Void doInBackground(String... params)
{
try
{
Log.d("tag", "nayana url "+url);
RssReader rssReader = new RssReader(params[0]);
Integer i = 0;
for (RssItem item : rssReader.getItems())
{
adapter.add(item.getTitle());
i++;
if(i == 7)
{
break;
}
}
} catch (Exception e)
{
Log.v("Error Parsing Data", e + "");
}
return null;
}
@Override
protected void onPostExecute(Void aVoid)
{
super.onPostExecute(aVoid);
adapter.notifyDataSetChanged();
mList.setAdapter(adapter);
}
}
从onCreate,你打电话
new GetRssFeed("http://feeds.arstechnica.com/arstechnica/index", lList, ADAPTER).execute();
new GetRssFeed("http://feeds.skynews.com/feeds/rss/home.xml", mList, adapterSECOND).execute();