我怎样在一个AsyncTask的添加到这个？ [英] How do I add an AsyncTask to this?
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问题描述
我创建一个Android应用程序，我是相当新的，一般我有，我用它来调用两个不同的Web服务，如下图所示两种不同的方法来穿线，让我怎么改变这些使用AsyncTask的在后台运行线程？
我的code：
公开名单＆LT;串GT; getEvacRouteNames（）{
如果（android.os.Build.VERSION.SDK_INT＆GT; 9）{
。StrictMode.ThreadPolicy政策=新StrictMode.ThreadPolicy.Builder（）permitAll（）建（）;
StrictMode.setThreadPolicy（政策）;
}
在的BufferedReader = NULL;
字符串的页面; 尝试{
HttpClient的客户端=新DefaultHttpClient（）;
HttpPost要求=新HttpPost（）;
request.setURI（URI）
//添加参数。该ASMX Web服务需要一个双，但被张贴在一个文本字段中输入字符串
清单＆LT;＆的NameValuePair GT; nameValPairs =新的ArrayList＆LT;＆的NameValuePair GT;（0）;
request.setEntity（新UrlEn codedFormEntity（nameValPairs））; HTT presponse响应= client.execute（请求）;
在=新的BufferedReader
（新的InputStreamReader（response.getEntity（）的getContent（）））;
StringBuffer的SB =新的StringBuffer（）;
串线=;
串NL = System.getProperty（line.separator）;
而（（行= in.readLine（））！= NULL）{
sb.append（行+ NL）; }
附寄（）;
页= sb.toString（）;
DBF的DocumentBuilderFactory = DocumentBuilderFactory.newInstance（）;
的DocumentBuilder分贝= dbf.newDocumentBuilder（）;
文档的文档= db.parse（新的InputSource（新StringReader（页）））;
//规范化文件
doc.getDocumentElement（）正常化（）。
//获取根节点
节点列表节点列表= doc.getElementsByTagName（字符串）;
//节点有三个子节点
对于（INT N = 0; N＆LT; nodeList.getLength（）; N ++）{
节点node = nodeList.item（N）;
串upperNode = node.getNodeName（）;
。节点温度= node.getChildNodes（）项（N）;
如果（upperNode.equals（字符串））{
串routeName = node.getTextContent（）;
routeNamesList.add（node.getTextContent（））;
}
} //System.out.println(page）;
}赶上（例外五）{
E.printStackTrace（）;
}
最后{
如果（在！= NULL）{
尝试{
附寄（）;
}赶上（IOException异常五）{
e.printStackTrace（）;
}
}
}
返回routeNamesList;
}公共EvacRoute getEvacuationRoute（字符串routeName，经纬度currentLocation，纬度字符串，字符串LON）抛出的URISyntaxException，ClientProtocolException，IOException异常，的ParserConfigurationException，SAXException中{
evacRouteList =新的ArrayList＆LT; EvacRoute＆GT;（）;
如果（android.os.Build.VERSION.SDK_INT＆GT; 9）{
。StrictMode.ThreadPolicy政策=新StrictMode.ThreadPolicy.Builder（）permitAll（）建（）;
StrictMode.setThreadPolicy（政策）;
}
EvacRoute evacRoute =新EvacRoute（）;
evacRoute.setDestinationName（routeName）;
在的BufferedReader = NULL;
字符串的页面;
latslngsList =新的ArrayList＆LT;＆经纬度GT;（）;
尝试{ latslngsList.add（currentLocation）;
HttpClient的客户端=新DefaultHttpClient（）;
HttpPost要求=新HttpPost（）;
request.setURI（URI）
//添加参数。该ASMX Web服务需要一个双，但被张贴在一个文本字段中输入字符串
清单＆LT;＆的NameValuePair GT; nameValPairs =新的ArrayList＆LT;＆的NameValuePair GT;（2）;
nameValPairs.add（新BasicNameValuePair（ROUTE_NAMErouteName））;
nameValPairs.add（新BasicNameValuePair（In_Lat，纬度））;
nameValPairs.add（新BasicNameValuePair（In_LonLON））;
request.setEntity（新UrlEn codedFormEntity（nameValPairs））; HTT presponse响应= client.execute（请求）;
在=新的BufferedReader
（新的InputStreamReader（response.getEntity（）的getContent（）））;
StringBuffer的SB =新的StringBuffer（）;
串线=;
串NL = System.getProperty（line.separator）;
而（（行= in.readLine（））！= NULL）{
sb.append（行+ NL）; }
附寄（）;
页= sb.toString（）;
DBF的DocumentBuilderFactory = DocumentBuilderFactory.newInstance（）;
的DocumentBuilder分贝= dbf.newDocumentBuilder（）;
文档的文档= db.parse（新的InputSource（新StringReader（页）））;
//规范化文件
doc.getDocumentElement（）正常化（）。
//获取根节点
节点列表节点列表= doc.getElementsByTagName（simple_ll_waypoint）;
双纬度= 0;
双经度= 0;
//节点有三个子节点
对于（INT N = 0; N＆LT; nodeList.getLength（）; N ++）{
串latString =;
串longString =; 节点node = nodeList.item（N）;
串upperNode = node.getNodeName（）;
StringBuilder的addressStrBlder =新的StringBuilder（）;
的for（int i = 0; I＆LT; node.getChildNodes（）的getLength（）;我++）{
节点温度= node.getChildNodes（）（i）项。
字符串节点名称= temp.getNodeName（）;
串的nodeValue = temp.getNodeValue（）;
如果（temp.getNodeName（）。equalsIgnoreCase（纬度））{
latString = temp.getTextContent（）;
纬度= Double.parseDouble（latString）; }否则如果（temp.getNodeName（）。equalsIgnoreCase（经度））{
longString = temp.getTextContent（）;
经度= Double.parseDouble（longString）;
经纬度经纬度=新的经纬度（纬度，经度）;
latslngsList.add（经纬度）;
} }
//Log.e(\"Fuel停止，fuelStop.toString（））;
} //System.out.println(page）;
}赶上（例外五）{
E.printStackTrace（）;
}
最后{
如果（在！= NULL）{
尝试{
附寄（）;
}赶上（IOException异常五）{
e.printStackTrace（）;
}
}
}
evacRoute.setLatLngList（latslngsList）;
evacRouteList.add（evacRoute）;
返回evacRoute;
}
解决方案
您可以从的AsyncTask 扩展您的类，做这样的：
公共类AsyncCustomTask扩展的AsyncTask＆LT;太虚，太虚，列表与LT;弦乐＆GT;＆GT; { @覆盖
保护列表与LT;弦乐＆GT; doInBackground（虚空...... PARAMS）{
返回getEvacRouteNames（）;
} @覆盖
保护无效onPostExecute（列表＆LT;串GT;的结果）{
//函数结束和价值又回来了。
} }
和调用它：
新AsyncCustomTask（）执行（）;
更新了第二个问题
对于有参数的方法，你可以用你喜欢的类构造器：
公共类AsyncSecondCustomTask扩展的AsyncTask＆LT;太虚，太虚，EvacRoute＆GT; { 私人最终字符串routeName;
私人最终经纬度currentLocation;
私人最终字符串纬度;
私人最终字符串LON; 公共AsyncSecondCustomTask（字符串routeName，经纬度currentLocation，纬度字符串，字符串LON）{
this.routeName = routeName;
this.currentLocation = currentLocation;
this.lat =纬度;
this.lon = LON;
} @覆盖
保护EvacRoute doInBackground（虚空...... PARAMS）{
返回getEvacuationRoute（routeName，currentLocation，纬度，经度）;
} @覆盖
保护无效onPostExecute（EvacRoute结果）{
//函数结束和价值又回来了。
} }
和你可以说它是这样的：
新AsyncSecondCustomTask（，NULL，，）.execute（）;
I am creating a Android app and I am fairly new to threading in general I have two different methods that I use to call two different webservices as shown below, so how do I change these to use the AsyncTask to run on a background thread?
My Code:
public List<String> getEvacRouteNames(){
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
BufferedReader in = null;
String page;
try {
HttpClient client = new DefaultHttpClient();
HttpPost request = new HttpPost();
request.setURI(URI)
//Add The parameters. The asmx webservice requires a double but gets posted as a string in a text field
List<NameValuePair> nameValPairs = new ArrayList<NameValuePair>(0);
request.setEntity(new UrlEncodedFormEntity(nameValPairs));
HttpResponse response = client.execute(request);
in = new BufferedReader
(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
page = sb.toString();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(new StringReader(page)));
// normalize the document
doc.getDocumentElement().normalize();
// get the root node
NodeList nodeList = doc.getElementsByTagName("string");
// the node has three child nodes
for (int n = 0; n < nodeList.getLength(); n++) {
Node node=nodeList.item(n);
String upperNode = node.getNodeName();
Node temp=node.getChildNodes().item(n);
if (upperNode.equals("string")){
String routeName = node.getTextContent();
routeNamesList.add(node.getTextContent());
}
}
//System.out.println(page);
} catch (Exception E) {
E.printStackTrace();
}
finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return routeNamesList;
}
public EvacRoute getEvacuationRoute(String routeName, LatLng currentLocation, String lat, String lon) throws URISyntaxException, ClientProtocolException, IOException, ParserConfigurationException, SAXException{
evacRouteList = new ArrayList<EvacRoute>();
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
EvacRoute evacRoute = new EvacRoute();
evacRoute.setDestinationName(routeName);
BufferedReader in = null;
String page;
latslngsList = new ArrayList<LatLng>();
try {
latslngsList.add(currentLocation);
HttpClient client = new DefaultHttpClient();
HttpPost request = new HttpPost();
request.setURI(URI)
//Add The parameters. The asmx webservice requires a double but gets posted as a string in a text field
List<NameValuePair> nameValPairs = new ArrayList<NameValuePair>(2);
nameValPairs.add(new BasicNameValuePair("Route_Name", routeName));
nameValPairs.add(new BasicNameValuePair("In_Lat", lat));
nameValPairs.add(new BasicNameValuePair("In_Lon", lon));
request.setEntity(new UrlEncodedFormEntity(nameValPairs));
HttpResponse response = client.execute(request);
in = new BufferedReader
(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
page = sb.toString();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(new StringReader(page)));
// normalize the document
doc.getDocumentElement().normalize();
// get the root node
NodeList nodeList = doc.getElementsByTagName("simple_ll_waypoint");
double latitude = 0;
double longitude= 0;
// the node has three child nodes
for (int n = 0; n < nodeList.getLength(); n++) {
String latString = "";
String longString = "";
Node node=nodeList.item(n);
String upperNode = node.getNodeName();
StringBuilder addressStrBlder = new StringBuilder();
for (int i = 0; i < node.getChildNodes().getLength(); i++) {
Node temp=node.getChildNodes().item(i);
String nodeName = temp.getNodeName();
String nodevalue = temp.getNodeValue();
if(temp.getNodeName().equalsIgnoreCase("Lat")){
latString = temp.getTextContent();
latitude = Double.parseDouble(latString);
} else if(temp.getNodeName().equalsIgnoreCase("Lon")){
longString = temp.getTextContent();
longitude = Double.parseDouble(longString);
LatLng latlng = new LatLng(latitude, longitude);
latslngsList.add(latlng);
}
}
//Log.e("Fuel Stop", fuelStop.toString());
}
//System.out.println(page);
} catch (Exception E) {
E.printStackTrace();
}
finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
evacRoute.setLatLngList(latslngsList);
evacRouteList.add(evacRoute);
return evacRoute;
}
解决方案
You can extend your class from AsyncTask and do like this:
public class AsyncCustomTask extends AsyncTask<Void, Void, List<String>> {
@Override
protected List<String> doInBackground(Void... params) {
return getEvacRouteNames();
}
@Override
protected void onPostExecute(List<String> result) {
// Function finished and value has returned.
}
}
And to call it:
new AsyncCustomTask().execute();
Updated for second question
For the method that have parameters, you can use constructor of your class like:
public class AsyncSecondCustomTask extends AsyncTask<Void, Void, EvacRoute> {
private final String routeName;
private final LatLng currentLocation;
private final String lat;
private final String lon;
public AsyncSecondCustomTask(String routeName, LatLng currentLocation, String lat, String lon) {
this.routeName = routeName;
this.currentLocation = currentLocation;
this.lat = lat;
this.lon = lon;
}
@Override
protected EvacRoute doInBackground(Void... params) {
return getEvacuationRoute(routeName, currentLocation, lat, lon);
}
@Override
protected void onPostExecute(EvacRoute result) {
// Function finished and value has returned.
}
}
And you can call it like:
new AsyncSecondCustomTask("", null, "", "").execute();
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