從android的

Question

XML文件中獲取來自 標記的驅動指令我需要從Google Directions返回的XML文件的html_instructions標記中獲取驅動方向。返回的XML文件具有標籤層次結構，如route - > leg - > step。一個路由標記具有多個腿標記，一個腿標記具有多個步驟標記。每個步驟標籤都有一個標籤。我需要通過XML解析從文件中檢索所有html_instructions標記的內容。

我不知道如何通過解析文件並獲得Android的

所需的輸出

請幫助..

我的代碼來獲取XML文件：

private void fetchData() { 
    StringBuilder urlString = new StringBuilder(); 
    urlString 
      .append("http://maps.google.com/maps/api/directions/xml?origin="); 
    urlString.append(lat1); 
    urlString.append(","); 
    urlString.append(lon1); 
    urlString.append("&destination=");// to 
    urlString.append(lat2); 
    urlString.append(","); 
    urlString.append(lon2); 
    urlString.append("&sensor=true&mode=driving"); 
    Log.d("url", "::" + urlString.toString()); 
    HttpURLConnection urlConnection = null; 
    URL url = null; 
    try { 
     url = new URL(urlString.toString()); 
     urlConnection = (HttpURLConnection) url.openConnection(); 
     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 
     urlConnection.setDoInput(true); 
     urlConnection.connect(); 
     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder db = dbf.newDocumentBuilder(); 
     doc = (Document) db.parse(urlConnection.getInputStream());// Util.XMLfromString(response); 

    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (ParserConfigurationException e) { 
     e.printStackTrace(); 
    } catch (SAXException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
} 

我需要解析文檔對象'doc'。由谷歌返回 示例文件：

<DirectionsResponse> 
<status>OK</status> 
<route> 
    <summary>I-40 W</summary> 
    <leg> 
    <step> 
    <travel_mode>DRIVING</travel_mode> 
    <start_location> 
    <lat>41.8507300</lat> 
    <lng>-87.6512600</lng> 
    </start_location> 
    <end_location> 
    <lat>41.8525800</lat> 
    <lng>-87.6514100</lng> 
    </end_location> 
    <polyline> 
    <points>a~l~Fjk~uOwHJy@P</points> 
    </polyline> 
    <duration> 
    <value>19</value> 
    <text>1 min</text> 
    </duration> 
    <html_instructions>Head <b>north</b> on <b>S Morgan St</b> toward <b>W Cermak Rd</b></html_instructions> 
    <distance> 
    <value>207</value> 
    <text>0.1 mi</text> 
    </distance> 
    </step> 
    ... 
    ... additional steps of this leg 
    ... 
    ... additional legs of this route 
    <duration> 
    <value>74384</value> 
    <text>20 hours 40 mins</text> 
    </duration> 
    <distance> 
    <value>2137146</value> 
    <text>1,328 mi</text> 
    </distance> 
    <start_location> 
    <lat>35.4675602</lat> 
    <lng>-97.5164276</lng> 
    </start_location> 
    <end_location> 
    <lat>34.0522342</lat> 
    <lng>-118.2436849</lng> 
    </end_location> 
    <start_address>Oklahoma City, OK, USA</start_address> 
    <end_address>Los Angeles, CA, USA</end_address> 
    <copyrights>Map data ©2010 Google, Sanborn</copyrights> 
    <overview_polyline> 
    <points>a~l~Fjk~uOnzh@vlbBtc~@tsE`vnApw{A`dw@~w\|tNtqf@l{Yd_Fblh@rxo@b}@xxSfytAblk@xxaBeJxlcBb~t@zbh@jc|Bx}C`rv@rw|@rlhA~dVzeo@vrSnc}Axf]fjz@xfFbw~@dz{A~d{A|zOxbrBbdUvpo@`cFp~xBc`Hk@nurDznmFfwMbwz@bbl@lq~@loPpxq@bw_@v|{CbtY~jGqeMb{iF|n\~mbDzeVh_Wr|Efc\x`Ij{kE}mAb~uF{cNd}xBjp]fulBiwJpgg@|kHntyArpb@bijCk_Kv~eGyqTj_|@`uV`k|DcsNdwxAott@r}q@_gc@nu`CnvHx`k@dse@j|p@zpiAp|gEicy@`omFvaErfo@igQxnlApqGze~AsyRzrjAb__@ftyB}pIlo_BflmA~yQftNboWzoAlzp@mz`@|}_@fda@jakEitAn{fB_a]lexClshBtmqAdmY_hLxiZd~XtaBndgC</points> 
    </overview_polyline> 
    <optimized_waypoint_index>0</optimized_waypoint_index> 
    <optimized_waypoint_index>1</optimized_waypoint_index> 
    <bounds> 
    <southwest> 
    <lat>34.0523600</lat> 
    <lng>-118.2435600</lng> 
    </southwest> 
    <northeast> 
    <lat>41.8781100</lat> 
    <lng>-87.6297900</lng> 
    </northeast> 
    </bounds> 
</route> 
</DirectionsResponse> 

Answer 1

public ArrayList<String> getInstructions (Document doc) { 
     NodeList nl1, nl2; 
     ArrayList<String> listDirections = new ArrayList<String>(); 
     nl1 = doc.getElementsByTagName("step"); 
     if (nl1.getLength() > 0) { 
      for (int i = 0; i < nl1.getLength(); i++) { 
       Node node1 = nl1.item(i); 
       nl2 = node1.getChildNodes(); 
       Node directionNode = nl2.item(getNodeIndex(nl2, "html_instructions")); 
       String instruction = directionNode.getTextContent(); 
       listDirections.add(instruction.replaceAll("\\<.*?>","")); 
      } 
     } 
     return listDirections; 
    } 

Answer 2

您可以使用 'Html.fromHtml（HTML_TEXT）'

public ArrayList<String> getInstructions (Document doc) { 
    NodeList nl1, nl2; 
    ArrayList<String> listDirections = new ArrayList<String>(); 
    nl1 = doc.getElementsByTagName("step"); 
    if (nl1.getLength() > 0) { 
     for (int i = 0; i < nl1.getLength(); i++) { 
      Node node1 = nl1.item(i); 
      nl2 = node1.getChildNodes(); 
      Node directionNode = nl2.item(getNodeIndex(nl2, "html_instructions")); 
      String instruction = directionNode.getTextContent(); 

      listDirections.add(Html.fromHtml(instruction)); 
     } 
    } 
    return listDirections;