我是android开发的新手。我正在尝试创建一个应用程序，它需要同时执行“发布”请求和“获取”请求，我正在使用asynctask。它工作正常，但有时发生问题是当应用程序尝试执行两个或多个“发布”请求时，它只执行一个“帖子”。但我需要同时或逐步执行所有“发布”请求。下面给出的代码：
import android.content.Context;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class GetPostAsyncTask extends AsyncTask<String, Void, String> {
// HttpURLConnection httpURLConnection;
private static String responseStr = "";
private static String responseStrLogin = "";
private static String responseStrSignUp = "";
private static String responseStrFriendList = "";
private static String responseStrUpdateLocation = "";
private static String responseStrSettings = "";
private static String responseStrSearchFriendForRequest = "";
private static String responseStrSendFriendRequest = "";
private static String responseStrUserFriendRequestList = "";
private static String responseStrApproveFriendRequest = "";
private static String responseStrProfileDetails = "";
private static String responseStrCarDetails="";
private static String responseStrCorporateDetails="";
private static String responseStrPasswordChange="";
private static String responseStrLocationShareToggle="";
private static String responseStrToggleStatus="";
private static String responseStrForgetPassword="";
private static String responseStrSearchResult="";
private static String responseStrDeleteFriend="";
private static String responseStrSearchResultFriendList="";
private static String responseStrShowFriendList="";
private static String responseStrShowFriendProfileDetails="";
private static String responseStrTimeSetForIndividuals="";
private static String responseStrFriendListPeriod="";
private static String responseStrFriendsRouteLatLng="";
private static String responseStrDangerNotification="";
private static String responseStrDangerNotificationPost="";
private final String baseUrl = UserInfo.getSiteUrl();
Context context;
GetPostAsyncTask(Context context) {
this.context = context;
}
@Override
protected void onPreExecute() {
//Toast.makeText(context,"Loading..",Toast.LENGTH_SHORT).show();
}
@Override
protected String doInBackground(String... args) {
try {
// setting the URL
URL url = new URL(baseUrl+args[1]);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.addRequestProperty("User-Agent", "RealTimeApps/1.0");
// setting the method type
httpURLConnection.setRequestMethod(args[0]);
// httpURLConnection.setChunkedStreamingMode(0);
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
Log.v("Url",args[2]);
// setting the identification key name with query params
bufferedWriter.write(args[2]);
bufferedWriter.flush();
bufferedWriter.close();
Log.v("GetPostA", url.toString());
httpURLConnection.setReadTimeout(15*1000);
httpURLConnection.connect();
int getPostStatus = httpURLConnection.getResponseCode();
Log.v("GetPostSts", String.valueOf(getPostStatus));
String line = "";
String res = "";
// if(getPostStatus == 200){
// prepare the output buffer
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((line = bufferedReader.readLine()) != null) {
res += line;
}
inputStream.close();
// }
httpURLConnection.disconnect();
switch (args[3]){
case "1":
responseStrLogin = res.toString();
break;
case "2":
responseStrSignUp = res.toString();
break;
case "3":
responseStrFriendList = res.toString();
break;
case "4":
responseStrUpdateLocation = res.toString();
break;
case "5":
responseStrSettings = res.toString();
break;
case "6":
responseStrSearchFriendForRequest = res.toString();
break;
case "7":
responseStrSendFriendRequest = res.toString();
break;
case "8":
responseStrUserFriendRequestList = res.toString();
break;
case "9":
responseStrApproveFriendRequest = res.toString();
break;
case "10":
responseStrProfileDetails = res.toString();
break;
case "11":
responseStrCarDetails = res.toString();
break;
case "12":
responseStrCorporateDetails=res.toString();
break;
case "13":
responseStrPasswordChange=res.toString();
break;
case "14":
responseStrLocationShareToggle=res.toString();
break;
case "15":
responseStrToggleStatus=res.toString();
break;
case "16":
responseStrForgetPassword=res.toString();
break;
case "17":
responseStrSearchResult=res.toString();
break;
case "18":
responseStrDeleteFriend=res.toString();
break;
case "19":
responseStrSearchResultFriendList=res.toString();
break;
case "20":
responseStrShowFriendList=res.toString();
break;
case "21":
responseStrShowFriendProfileDetails=res.toString();
break;
case "22":
responseStrTimeSetForIndividuals=res.toString();
break;
case "23":
responseStrFriendListPeriod=res.toString();
break;
case "24":
responseStrFriendsRouteLatLng=res.toString();
break;
case "25":
responseStrDangerNotification=res.toString();
break;
case "26":
responseStrDangerNotificationPost=res.toString();
break;
default:
responseStr = res.toString();
break;
}
// Log.v("ResD", res.toString());
return res.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
Log.v("GetPostCatchMal",e.toString());
} catch (IOException e) {
e.printStackTrace();
Log.v("GetPostCatchIOE", e.toString());
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
}
public String getResponse(int param){
String tmpStr = "Error";
switch (param){
case 1:
tmpStr = responseStrLogin;
break;
case 2:
tmpStr = responseStrSignUp;
break;
case 3:
tmpStr = responseStrFriendList;
break;
case 4:
tmpStr = responseStrUpdateLocation;
break;
case 5:
tmpStr = responseStrSettings;
break;
case 6:
tmpStr = responseStrSearchFriendForRequest;
break;
case 7:
tmpStr = responseStrSendFriendRequest;
break;
case 8:
tmpStr = responseStrUserFriendRequestList;
break;
case 9:
tmpStr = responseStrApproveFriendRequest;
break;
case 10:
tmpStr = responseStrProfileDetails;
break;
case 11:
tmpStr = responseStrCarDetails;
break;
case 12:
tmpStr=responseStrCorporateDetails;
break;
case 13:
tmpStr=responseStrPasswordChange;
break;
case 14:
tmpStr=responseStrLocationShareToggle;
break;
case 15:
tmpStr=responseStrToggleStatus;
break;
case 16:
tmpStr=responseStrForgetPassword;
break;
case 17:
tmpStr=responseStrSearchResult;
break;
case 18:
tmpStr=responseStrDeleteFriend;
break;
case 19:
tmpStr=responseStrSearchResultFriendList;
break;
case 20:
tmpStr=responseStrShowFriendList;
break;
case 21:
tmpStr=responseStrShowFriendProfileDetails;
break;
case 22:
tmpStr=responseStrTimeSetForIndividuals;
break;
case 23:
tmpStr=responseStrFriendListPeriod;
break;
case 24:
tmpStr=responseStrFriendsRouteLatLng;
break;
case 25:
tmpStr=responseStrDangerNotification;
break;
case 26:
tmpStr=responseStrDangerNotificationPost;
break;
default:
tmpStr = responseStr;
break;
};
return tmpStr;
}
}
答案 0 :(得分：0)
将Executer与线程池一起使用以启动AsyncTask。在你的情况下：
backgroundTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,"POST","main/getFriendInDanger",dangerQuery,"25");
AsyncTask.THREAD_POOL_EXECUTOR是预先声明的Executer。当然，您可以自定义Executer（在您的情况下可能不需要）。如果你想使用java.util.concurrent.Executers helper方法，请注意你必须保持执行者的应用程序生命周期，并且不要随时创建执行者想要执行AsyncTask。（你可以将你的执行者留在静态字段中）。 / p>