需要在我的 Android 应用中更改日期格式

Question

更新。我真的在为给出的答案而苦苦挣扎（它们的答案还不错，我只是在苦苦挣扎） 这真的有助于获得更详细的答案

我正在将 RSS 提要拉入我的应用程序，pubDate 当前显示为例如 Mon, 10 Nov 2014 03:34:38 +0000。

我需要它以更加用户友好的方式显示。我查看了所有选项，SimpleDateFormat..etc，我对 Java 有点陌生，所以以前的所有建议都在我脑海中，我正在寻找我真正需要在我的代码中放入的内容。

代码如下 AndroidXMLParsingActivity.java

package com.example.myapp;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Locale;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import java.util.Calendar;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;


public class AndroidXMLParsingActivity extends ListActivity {

// All static variables
static final String URL = "http://example.xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_DATE = "pubDate";
static final String KEY_DESC = "description";
static final String KEY_ID = "title";
static final String KEY_LDESC = "content:encoded";


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

    ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

    XMLParser parser = new XMLParser();
    String xml = parser.getXmlFromUrl(URL); // getting XML
    Document doc = parser.getDomElement(xml); // getting DOM element

    NodeList nl = doc.getElementsByTagName(KEY_ITEM);
    // looping through all item nodes <item>
    for (int i = 0; i < nl.getLength(); i++) {
        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();
        Element e = (Element) nl.item(i);
        // adding each child node to HashMap key => value
        map.put(KEY_ID, parser.getValue(e, KEY_ID));
        map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
        map.put(KEY_DATE, parser.getValue(e, KEY_DATE));
        map.put(KEY_DESC, parser.getValue2(e, KEY_DESC));
        map.put(KEY_LDESC, parser.getValue2(e, KEY_LDESC));

        // adding HashList to ArrayList
        menuItems.add(map);
    }

    // Adding menuItems to ListView

    ListAdapter adapter = new SimpleAdapter(this, menuItems,
            R.layout.list_item,
            new String[] { KEY_ID, KEY_LDESC, KEY_DATE}, new int[] {
                    R.id.name, R.id.content_encoded, R.id.pubDate });

    setListAdapter(adapter);

    // selecting single ListView item
    ListView lv = getListView();

    lv.setOnItemClickListener(new OnItemClickListener() {



        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
            String description = ((TextView) view.findViewById(R.id.description)).getText().toString();
            String Ldescription = ((TextView) view.findViewById(R.id.content_encoded)).getText().toString();
            String pubDate = ((TextView) view.findViewById(R.id.pubDate)).getText().toString();



            // Starting new intent
            Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
            in.putExtra(KEY_ID, name);
            in.putExtra(KEY_DESC, description);
            in.putExtra(KEY_LDESC, Ldescription);
            in.putExtra(KEY_DATE, pubDate);
            startActivity(in);



        }
    });
}
}

XMLParser.java

package com.example.myapp;

import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;


import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import android.util.Log;

public class XMLParser {

// constructor
public XMLParser() {

}

/**
 * Getting XML from URL making HTTP request
 * @param url string
 * */
public String getXmlFromUrl(String url) {
    String xml = null;

    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        xml = EntityUtils.toString(httpEntity);

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    // return XML
    return xml;
}

/**
 * Getting XML DOM element
 * @param XML string
 * */
public Document getDomElement(String xml){
    Document doc = null;
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    try {

        DocumentBuilder db = dbf.newDocumentBuilder();

        InputSource is = new InputSource();
            is.setCharacterStream(new StringReader(xml));
            doc = db.parse(is); 

        } catch (ParserConfigurationException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        } catch (SAXException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        } catch (IOException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        }

        return doc;
}

/** Getting node value
  * @param elem element
  */
 public final String getElementValue( Node elem ) {
     Node child;
     if( elem != null){
         if (elem.hasChildNodes()){
             for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
                 if( child.getNodeType() == Node.TEXT_NODE  ){
                     return child.getNodeValue();
                 }
             }
         }
     }
     return "";
 }










 public final String getElementValue2( Node elem ) {
     Node child;
     if( elem != null){
         if (elem.hasChildNodes()){
             for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
                 //if( child.getNodeType() == Node.TEXT_NODE  ){
                 if(child.getNodeType() == Node.CDATA_SECTION_NODE){
                     return child.getNodeValue();
                 }
             }
         }
     }
     return "";
     //return elem.getTextContent();
 }

 public static String getCharacterDataFromElement(Node elem) {
        Node child = elem.getFirstChild();
        if (child instanceof CharacterData) {
          CharacterData cd = (CharacterData) child;
          return cd.getData();
        }
        return "";
      }

 public String getValue3(Element item, String str){
     NodeList n = item.getElementsByTagNameNS("http://purl.org/rss/1.0/modules/content/", str);
     String ses = this.getElementValue2(n.item(0));
     //return this.getElementValue2(n.item(0));
     //return ses;
     String mim =ses.replaceAll("(?s)\\<.*?\\>", " \n");
     //return Promjena(ses);
     return mim;
 }







 /**
  * Getting node value
  * @param Element node
  * @param key string
  * */
 public String getValue(Element item, String str) {     
        NodeList n = item.getElementsByTagName(str);        
        return this.getElementValue(n.item(0));
    }


 public String getValue2(Element item, String str) {        
        NodeList n = item.getElementsByTagName(str);        
        return XMLParser.getCharacterDataFromElement(n.item(0));
    }



}

我不确定您是否需要更多信息。 我也确信有很多错误或冗余代码，任何帮助都会很棒！

非常感谢！

Answer 1

String date = "Mon, 10 Nov 2014 03:34:38 +0000";


SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm");
Date _date = null;
try {
    _date = sourceFormat.parse(date);
} catch (ParseException e) {
    e.printStackTrace();
}
System.out.println(_date .toString()); 



 // print the Date in year month and date


SimpleDateFormat targetFormat = new SimpleDateFormat("yyyy-MM-dd");
System.out.println(targetFormat.format(_date));

Answer 2

您可以使用 SimpleDateFormat 类来转换友好日期，如下所示

public String getFriendlyDayString(Date pubDate){
     SimpleDateFormat shortenedDateFormat = new SimpleDateFormat("EEE MMM dd");
     return shortenedDateFormat.format(pubDate);
}

您可以将您的 pubDate 传递给喜欢这个 getFriendlyDateString(pubDate);

Answer 3

我尝试替换

String pubDate = ((TextView) view.findViewById(R.id.pubDate)).getText().toString();

与

String pubDate = "Mon, 10 Nov 2014 03:34:38 +0000";


            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm");
            Date _date = null;
            try {
                _date = dateFormat.parse(pubDate);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            System.out.println(_date .toString()); 



             // print the Date in year month and date


            SimpleDateFormat targetFormat = new SimpleDateFormat("yyyy-MM-dd");
            ((TextView) view.findViewById(R.id.pubDate)).getText().toString();

没有工作...我在正确的轨道上吗？