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java - Android 切换 View

转载 作者:行者123 更新时间:2023-12-02 08:07:43 25 4
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我构建了一个 RSS 阅读器,当单击列表项时,它会切换到详细 View 。我在打开新 View 时遇到问题。我的代码在这里:

public void onItemClick(AdapterView parent, View v, int position, long id)
{

//Log.i(tag,"item clicked! [" + feed.getItem(position).getTitle() + "]");

Intent itemintent = new Intent(this,ShowDescription.class);

Bundle b = new Bundle();
b.putString("title", feed.getItem(position).getTitle());
b.putString("description", feed.getItem(position).getDescription());
b.putString("link", feed.getItem(position).getLink());
b.putString("pubdate", feed.getItem(position).getPubDate());

itemintent.putExtra("android.intent.extra.INTENT", b);

}

整个类的代码如下:

package com.CalvaryChapelMelbourne.feedparser;


import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.widget.TextView;
import android.widget.ListView;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AdapterView.OnItemClickListener;
import android.util.Log;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URL;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

import android.content.Intent;

import com.CalvaryChapelMelbourne.feedparser.ShowDescription;

public class RSSReader extends Activity implements OnItemClickListener
{

public final String RSSFEEDOFCHOICE = "http://app.calvaryccm.com/mobile/android/v1/devos";

public final String tag = "RSSReader";
private RSSFeed feed = null;

/** Called when the activity is first created. */

public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);

// go get our feed!
feed = getFeed(RSSFEEDOFCHOICE);

// display UI
UpdateDisplay();

}


private RSSFeed getFeed(String urlToRssFeed)
{
try
{
// setup the url
URL url = new URL(urlToRssFeed);

// create the factory
SAXParserFactory factory = SAXParserFactory.newInstance();
// create a parser
SAXParser parser = factory.newSAXParser();

// create the reader (scanner)
XMLReader xmlreader = parser.getXMLReader();
// instantiate our handler
RSSHandler theRssHandler = new RSSHandler();
// assign our handler
xmlreader.setContentHandler(theRssHandler);
// get our data via the url class
InputSource is = new InputSource(url.openStream());
// perform the synchronous parse
xmlreader.parse(is);
// get the results - should be a fully populated RSSFeed instance, or null on error
return theRssHandler.getFeed();
}
catch (Exception ee)
{
// if we have a problem, simply return null
System.out.println(ee.getMessage());
System.out.println(ee.getStackTrace());
System.out.println(ee.getCause());
return null;
}
}
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
menu.add(Menu.NONE, 0, 0, "Refresh");
Log.i(tag,"onCreateOptionsMenu");
return true;
}

public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case 0:

Log.i(tag,"Set RSS Feed");
return true;
case 1:
Log.i(tag,"Refreshing RSS Feed");
return true;
}
return false;
}


private void UpdateDisplay()
{
TextView feedtitle = (TextView) findViewById(R.id.feedtitle);
TextView feedpubdate = (TextView) findViewById(R.id.feedpubdate);
ListView itemlist = (ListView) findViewById(R.id.itemlist);


if (feed == null)
{
feedtitle.setText("No RSS Feed Available");
return;
}

if(feedtitle != null)
feedtitle.setText(feed.getTitle());
if(feedpubdate != null)
feedpubdate.setText(feed.getPubDate());


ArrayAdapter<RSSItem> adapter = new ArrayAdapter<RSSItem>(this,android.R.layout.simple_list_item_1,feed.getAllItems());

itemlist.setAdapter(adapter);

itemlist.setOnItemClickListener(this);

itemlist.setSelection(0);

}


public void onItemClick(AdapterView parent, View v, int position, long id)
{

//Log.i(tag,"item clicked! [" + feed.getItem(position).getTitle() + "]");

Intent itemintent = new Intent(this,ShowDescription.class);

Bundle b = new Bundle();
b.putString("title", feed.getItem(position).getTitle());
b.putString("description", feed.getItem(position).getDescription());
b.putString("link", feed.getItem(position).getLink());
b.putString("pubdate", feed.getItem(position).getPubDate());

itemintent.putExtra("android.intent.extra.INTENT", b);

}

}

最佳答案

您需要在 onItemClick 方法末尾调用 startActivity(itemintent)。另外,您要切换的是“Activity ”,而不是“ View ”。请参阅this documentationthis documentation on UI以获得更好的理解。

关于java - Android 切换 View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7894162/

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