在Android中为ListView解析XML

Question

我目前正在为android listview解析xml。 我能够解析并获取我的列表视图的数据。 但是，如果我想从该XML获取特定数据，该怎么办？嗯像执行 东西在SQL“select * from [table] where id = 1”。 类似的东西......我怎么用我的XML来做到这一点？ 谢谢

Answer 1

您应该只解析xml文件一次，并从中创建一个数组或对象列表。一旦你拥有了内存中的所有东西，你就可以使用这个数组来填充你的列表，使用ArrayAdapter。数组中的位置可以用作你的id。如果你宁愿让对象的属性成为id而不是位置，那么你可以相应地对数组进行排序。

Answer 2

public class XMLParsing_DisplayListviewActivity extends Activity { 
    String res1   = null; 
    InputStream is  = null; 
    StringBuilder sb = null; 

    public String[] mCD; 
    public String[] mTitle; 
    public String[] mArtist; 
    public String[] mCountry; 
    public String[] mCompany; 
    public String[] mPrice; 
    public String[] mYear; 

    ListView listview; 

    ProgressDialog mDialog = null; // thread code 
    private Runnable viewOrders; // thread code 
    private Thread thread1; 

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

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

     mDialog = new ProgressDialog(this); // thread code 
     mDialog.setMessage("Please wait..."); 

     viewOrders = new Runnable(){ 
     public void run(){ 
      load(); 
      runOnUiThread(returnRes); 
     } 
    }; 
    thread1 = new Thread(null, viewOrders, "Background"); // thread 
    thread1.start(); // thread code 
    mDialog.show(); 

} 

private Runnable returnRes = new Runnable(){ 
    public void run(){ 
     mDialog.cancel(); 
     for(int i=0;i<mCD.length;i++){ 
       System.out.println("======================"); 
       System.out.println("Title :- "+mTitle[i]); 
       System.out.println("Artist :- "+mArtist[i]); 
       System.out.println("Country :- "+mCountry[i]); 
       System.out.println("Company :- "+mCompany[i]); 
       System.out.println("Price :- "+mPrice[i]); 
       System.out.println("Year :- "+mYear[i]); 
      } 


     listview.setAdapter(new CustomAdapter(XMLParsing_DisplayListviewActivity.this));  

    } 
}; 

public void load() { 
    //mLoading = true; 
    Document doc = null; 
    HttpURLConnection urlConnection = null; 
    URL url = null; 
    try { 
     //url = new URL(urlString.toString()); 
     url = new URL("http://www.xmlfiles.com/examples/cd_catalog.xml"); 
     urlConnection = (HttpURLConnection) url.openConnection(); 
     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 
     urlConnection.setDoInput(true); 
     urlConnection.connect(); 
     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder db = dbf.newDocumentBuilder(); 
     doc = db.parse(urlConnection.getInputStream()); 
    } catch (Exception e) { 
     System.out.println("e"+e.toString()); 
    } 
    try { 
     NodeList nodes = doc.getElementsByTagName("CD"); 
     // iterate the employees 

     mCD=new String[nodes.getLength()]; 
     mTitle=new String[nodes.getLength()]; 
     mArtist=new String[nodes.getLength()]; 
     mCountry=new String[nodes.getLength()]; 
     mCompany=new String[nodes.getLength()]; 
     mPrice=new String[nodes.getLength()]; 
     mYear=new String[nodes.getLength()]; 

     for (int i = 0; i < nodes.getLength(); i++) { 
      Element element = (Element) nodes.item(i); 

      NodeList cd = element.getElementsByTagName("CD"); 
      Element line = (Element) cd.item(0); 
      mCD[i]=getCharacterDataFromElement(line);    

      NodeList title = element.getElementsByTagName("TITLE"); 
      line = (Element) title.item(0); 
      mTitle[i]=getCharacterDataFromElement(line); 
      //System.out.println("catcatcatmidmidmidmidName: " + getCharacterDataFromElement(line)); 

      NodeList artist = element.getElementsByTagName("ARTIST"); 
      line = (Element) artist.item(0); 
      mArtist[i]=getCharacterDataFromElement(line); 
      //System.out.println("salary: " + getCharacterDataFromElement(line)); 

      NodeList country = element.getElementsByTagName("COUNTRY"); 
      line = (Element) country.item(0); 
      mCountry[i]=getCharacterDataFromElement(line); 

      NodeList company = element.getElementsByTagName("COMPANY"); 
      line = (Element) company.item(0); 
      mCompany[i]=getCharacterDataFromElement(line); 

      NodeList price = element.getElementsByTagName("PRICE"); 
      line = (Element) price.item(0); 
      mPrice[i]=getCharacterDataFromElement(line); 

      NodeList year = element.getElementsByTagName("YEAR"); 
      line = (Element) year.item(0); 
      mYear[i]=getCharacterDataFromElement(line); 

     } 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

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


    public class CustomAdapter extends BaseAdapter { 
    private Context mContext; 
    Application app; 
    private LayoutInflater inflater=null; 

    public CustomAdapter(Context c) { 
     mContext = c; 
     inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    public int getCount() { 
     return mTitle.length; 

    } 

    public Object getItem(int position) { 
     return null; 
    } 

    public long getItemId(int position) { 
     return 0; 
    } 

    // create a new ImageView for each item referenced by the Adapter 
    public View getView(int position, View convertView, ViewGroup parent) { 

     View vi=convertView; 
     if (convertView == null)   
      vi = inflater.inflate(R.layout.list, null); 


     TextView txt=(TextView)vi.findViewById(R.id.txtview_title); 
     TextView txt1=(TextView)vi.findViewById(R.id.txtview_artist); 
     TextView txt2=(TextView)vi.findViewById(R.id.txtview_country); 
     TextView txt3=(TextView)vi.findViewById(R.id.txtview_company); 
     TextView txt4=(TextView)vi.findViewById(R.id.txtview_price); 
     TextView txt5=(TextView)vi.findViewById(R.id.txtview_year); 

     txt.setText("Title : " + mTitle[position]); 
     txt1.setText("Artist : " + mArtist[position]); 
     txt2.setText("Country : " + mCountry[position]); 
     txt3.setText("Company : " + mCompany[position]); 
     txt4.setText("Price : " + mPrice[position]); 
     txt5.setText("Year : " + mYear[position]); 

     return vi; 
    }; 
    } 
}