我有列表视图，我在其中放置使用Web服务asynctask在服务器中的图像。图像被放置。每当我尝试点击图像上的列表视图时，它就会卡在模拟器和手机中..
WebServiceTask wst = new WebServiceTask(WebServiceTask.GET_TASK, this, "Loading.....");
wst.execute(new String[]{sampleURL});
private class WebServiceTask extends AsyncTask<String, Integer, String> {
public static final int POST_TASK = 1;
public static final int GET_TASK = 2;
private static final String TAG = "WebServiceTask";
// connection timeout, in milliseconds (waiting to connect)
private static final int CONN_TIMEOUT = 3000;
// socket timeout, in milliseconds (waiting for data)
private static final int SOCKET_TIMEOUT = 5000;
private int taskType = GET_TASK;
private Context mContext = null;
private String processMessage = "Processing...";
private ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
private ProgressDialog pDlg = null;
public WebServiceTask(int taskType, Context mContext, String processMessage) {
this.taskType = taskType;
this.mContext = mContext;
this.processMessage = processMessage;
}
public void addNameValuePair(String name, String value) {
params.add(new BasicNameValuePair(name, value));
}
private void showProgressDialog() {
pDlg = new ProgressDialog(mContext);
pDlg.setMessage(processMessage);
pDlg.setProgressDrawable(mContext.getWallpaper());
pDlg.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pDlg.setCancelable(false);
pDlg.show();
}
@Override
protected void onPreExecute() {
//hideKeyboard();
showProgressDialog();
}
protected String doInBackground(String... urls) {
String url = urls[0];
String result = "";
HttpResponse response = doResponse(url);
if (response == null) {
return result;
} else {
try {
result = inputStreamToString(response.getEntity().getContent());
} catch (IllegalStateException e) {
Log.e(TAG, e.getLocalizedMessage(), e);
} catch (IOException e) {
Log.e(TAG, e.getLocalizedMessage(), e);
}
}
return result;
}
@Override
protected void onPostExecute(String response) {
handleResponse(response);
//aa.clear();
pDlg.dismiss();
}
// Establish connection and socket (data retrieval) timeouts
private HttpParams getHttpParams() {
HttpParams htpp = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(htpp, CONN_TIMEOUT);
HttpConnectionParams.setSoTimeout(htpp, SOCKET_TIMEOUT);
return htpp;
}
private HttpResponse doResponse(String url) {
// Use our connection and data timeouts as parameters for our
// DefaultHttpClient
HttpClient httpclient = new DefaultHttpClient(getHttpParams());
HttpResponse response = null;
try {
switch (taskType) {
case POST_TASK:
HttpPost httppost = new HttpPost(url);
//httppost.setHeader("Authorization","" );
//httppost.addHeader("Authorization", apikey);
httppost.setEntity(new UrlEncodedFormEntity(params));
response = httpclient.execute(httppost);
break;
case GET_TASK:
HttpGet httpget = new HttpGet(url);
//httpget.addHeader("Authorization", apikey);
//httpget.setHeader("Authorization",apikey );
response = httpclient.execute(httpget);
break;
}
} catch (Exception e) {
Log.e(TAG, e.getLocalizedMessage(), e);
}
return response;
}
public void handleResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
JSONArray jso = jsonObject.getJSONArray("search_result");
if(jso.length() != 0) {
for (int i = 0; i < jso.length(); i++) {
Person resultRow = new Person();
resultRow.id = jso.getJSONObject(i).getString("property_id");
resultRow.ProjectName = jso.getJSONObject(i).getString("property_name");
JSONObject ppty_image_object = jso.getJSONObject(i);
JSONArray ppty_image_array = ppty_image_object.getJSONArray("property_image");
for (int j = 0; j < ppty_image_array.length(); j++) {
resultRow.logo =ppty_image_array.getJSONObject(j).getString("image");
// resultRow.logo[j] = ppty_image_array.getJSONObject(j).getString("image");
}
// resultRow.logo =jso.getJSONObject(i).getString("image");
resultRow.id = jso.getJSONObject(i).getString("user_id");
resultRow.ProjectName = jso.getJSONObject(i).getString("property_name");
resultRow.bathrooms = jso.getJSONObject(i).getString("bathrooms");
resultRow.Host_Name = jso.getJSONObject(i).getString("user_name");
resultRow.city = jso.getJSONObject(i).getString("city");
resultRow.price = jso.getJSONObject(i).getString("price");
resultRow.bed = jso.getJSONObject(i).getString("bed");
resultRow.bedrooms = jso.getJSONObject(i).getString("bedrooms");
resultRow.guest_allow = jso.getJSONObject(i).getString("guest_allow");
resultRow.roomtype = jso.getJSONObject(i).getString("room_type");
resultRow.property_type = jso.getJSONObject(i).getString("property_type");
resultRow.user_ppty_id = jso.getJSONObject(i).getString("property_id");
resultRow.check_in_time = jso.getJSONObject(i).getString("check_in_time");
resultRow.check_out_time = jso.getJSONObject(i).getString("check_out_time");
if(jso.getJSONObject(i).getString("host_image").toString().equals("{}")){
resultRow.host_image= (getResources().getDrawable(R.drawable.close)).toString();
}else {
resultRow.host_image = jso.getJSONObject(i).getString("host_image");
}
ImageAdapter adapter = new ImageAdapter(this);
resultRow.city = jso.getJSONObject(i).getString("city");
resultRow.descrip = jso.getJSONObject(i).getString("description");
resultRow.latitude=jso.getJSONObject(i).getString("latitude");
resultRow.longlati=jso.optJSONObject(i).getString("longitude");
resultRow.minstay=jso.getJSONObject(i).getString("minimum_stay");
resultRow.cancelation=jso.getJSONObject(i).getString("cancellation_policy");
resultRow.houserules=jso.getJSONObject(i).getString("house_rules");
// resultRow.logo=jso.getJSONObject(i).getString("logo");
arrayOfwebData.add(resultRow);
}
}
}
catch (NullPointerException np){
Log.e(TAG, np.getLocalizedMessage(), np);
}
catch (Exception e) {
Log.e(TAG, e.getLocalizedMessage(), e);
}
ListView myListView = (ListView)findViewById(R.id.listview);
aa=new FancyAdapter();
myListView.setAdapter(aa);
// ViewHolder aa1= new ViewHolder();
}
我想停止并恢复后台运行过程，每当我尝试点击列表视图行时，它将重定向到下一页，每当我按下后退按钮时，后台将恢复... 有人帮帮我。