設置OnItemClick以在WebView中打開RSS提要的URL

Question

我知道我已經過分考慮或思考過，但是我似乎無法弄清楚用戶單擊它時如何啟動rss feed的鏈接。 我正在使用DOM解析器將xml文件解析為列表視圖，並從xml文件中獲取所有信息。 我遇到的問題是將其解析為我具有的Custom WebActivity，它應該也加載我擁有的webview客戶端。 這是我正在使用的代碼。

主要活動

 public class CustomizedListView extends Activity {
// All static variables
static final String URL = "http://treymorgan.net/feed";
// XML node keys
static final String KEY_ITEM = "item"; // parent node 
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_PUB_DATE = "pubDate";
static final String KEY_LINK = "guid";

ListView list;
LazyAdapter adapter;

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


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

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

    NodeList nl = doc.getElementsByTagName(KEY_ITEM);
    // looping through all song nodes <song>
    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_TITLE, parser.getValue(e, KEY_TITLE));
        map.put(KEY_PUB_DATE, parser.getValue(e, KEY_PUB_DATE));
        map.put(KEY_LINK, parser.getValue(e, KEY_LINK));

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


    list=(ListView)findViewById(R.id.list);

    // Getting adapter by passing xml data ArrayList
    adapter=new LazyAdapter(this, songsList);        
    list.setAdapter(adapter);


    // Click event for single list row
    list.setOnItemClickListener(new OnItemClickListener() {

編輯：這是我遇到問題的代碼部分... onItemClick方法將rss feed中的url發送到webview活動，以便可以在應用程序中查看而不是通過設備上的本機瀏覽器查看

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            Intent intent = new Intent(CustomizedListView.this, WebviewActivity.class);  
            Bundle b = new Bundle();
            intent.putExtra("KEY_LINK", b);
            startActivity(intent); 



             }

    });
}   
 }

這是我的Webview活動

 public class WebviewActivity extends Activity{
  private WebView webview;

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

    Bundle b = getIntent().getExtras(); 
    String KEY_LINK = b.getString("KEY_LINK");

    webview = (WebView) findViewById(R.id.webView1);
    webview.setWebViewClient(new MyWebViewClient(this));
    webview.getSettings().setAppCacheEnabled(false);
    webview.getSettings().setBuiltInZoomControls(true);
    webview.setInitialScale(1);
    webview.loadUrl(KEY_LINK);



  }


       }

因此，從根本上講，我想要做的是將KEY_GUID字符串連接到WebviewActivity，而我似乎無法弄清楚如何將字符串從一個活動獲取到另一個活動。 預先感謝您的任何幫助

編輯：好的，我已經做了一段時間，並且我更新了我正在使用的代碼，以解決此問題。 現在，我沒有任何錯誤，當我單擊一個項目時，它將打開WebviewActivity，但它不會加載網站，也不會將我的Webview客戶端附加到該網站上。 誰能幫我解決這個問題？

編輯：當我加載這樣的代碼時：

 @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            Intent intent = new Intent(CustomizedListView.this,    WebviewActivity.class);  
            Bundle b = new Bundle();
            intent.putExtra("b", "http://www.google.com" );
            startActivity(intent); 

它會打開webview活動並加載google。 因此，也許我現在遇到的問題是如何從DOM解析器中獲取所需的鏈接。 有人有想法么？

Answer 1

在您的通話活動中：

Intent i = new Intent(this, WebActivity.class);
i.putExtra(MY_KEY, "http://http://stackoverflow.com");
startActivity(i);

在您的接收活動中：

protected void onStart() {
  super.onStart();
  String myUrl = getExtras().getString(MY_KEY);
  webView.loadUrl(myUrl);
}

---

編輯：

假設您的適配器包含HashMaps（根據我對您如何解析XML的了解）

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
  HashMap<String, String> selectedSong = (HashMap<String, String>) parent.getItemAtPosition(position);

  Intent intent = new Intent(CustomizedListView.this, WebviewActivity.class);  
  intent.putExtra("KEY_LINK", selectedSong.get(KEY_LINK));
  startActivity(intent); 
}

Answer 2

對於從一個活動到另一個活動的傳遞字符串

第一次活動：

Intent indisplay = new Intent(FirstClass.this,SecondClass.class);
indisplay.putExtra("link",your link here);
startActivity(indisplay);

第二項活動：

 Intent indispaly = getIntent();
 String url = indispaly.getStringExtra("link");
    // your link from previous activity is stored into the url

並顯示到webview中 ，例如：

    protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
    setContentView(R.layout.newsdisplay);
    getWindow().setFeatureInt( Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON); 


    Intent indispaly = getIntent();
    String url = indispaly.getStringExtra("link");

    newswebview = (WebView) findViewById(R.id.news_webView);
    newswebview.setWebViewClient(new WebViewClient());

    WebSettings webSettings = newswebview.getSettings();
    webSettings.setJavaScriptEnabled(true);

    newswebview.getSettings().setSupportZoom(true);       //Zoom Control on web (You don't need this 
     //if ROM supports Multi-Touch      
    newswebview.getSettings().setBuiltInZoomControls(true); //Enable Multitouch if supported by ROM


    newswebview.loadUrl(url);


    final Activity MyActivity = this;


newswebview.setWebChromeClient(new WebChromeClient() {
    public void onProgressChanged(WebView view, int progress) 
       {

        //Make the bar disappear after URL is loaded, and changes string to Loading...
        MyActivity.setTitle("  Loading...");
        MyActivity.setProgress(progress * 100); //Make the bar disappear after URL is loaded

        // Return the app name after finish loading
           if(progress == 100){

               MyActivity.setTitle(R.string.app_name);

           }


    }
});

}

 @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event)   
    {  
        if ((keyCode == KeyEvent.KEYCODE_BACK) && newswebview.canGoBack()) {  
            newswebview.goBack();  
            return true;  
        }  
        return super.onKeyDown(keyCode, event);  
    }   

Answer 3

好的，這是我提出的問題的答案。 這對我來說非常有效，並且完全按照我的意願進行。 這是它的工作代碼

 public class CustomizedListView extends Activity {
// All static variables
static final String URL = "http://treymorgan.net/feed";
// XML node keys
static final String KEY_ITEM = "item"; // parent node 
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_PUB_DATE = "pubDate";
static final String KEY_LINK = "link";

ListView list;
LazyAdapter adapter;

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

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


    final ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

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

    NodeList nl = doc.getElementsByTagName(KEY_ITEM);
    // looping through all song nodes <song>
    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_ITEM));
        map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
        map.put(KEY_PUB_DATE, parser.getValue(e, KEY_PUB_DATE));
        map.put(KEY_LINK, parser.getValue(e, KEY_LINK));

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


    list=(ListView)findViewById(R.id.list);

    // Getting adapter by passing xml data ArrayList
    adapter=new LazyAdapter(this, songsList);        
    list.setAdapter(adapter);


    // Click event for single list row
    list.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            Intent intent = new Intent(CustomizedListView.this, WebviewActivity.class);  
            new Bundle();
            intent.putExtra( "b", songsList.get(position).get(KEY_LINK));
            startActivity(intent); 



             }

    });
}   
 }