我在一个Fragment中执行一个AsyncTask，我想操纵onPostExecute（）的结果。为了做到这一点，我遵循了How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
我现在需要通过新的Request.Builder（）对其进行操作。这就是我崩溃的地方。我无法执行以下代码行：
mResponseBody = Objects.requireNonNull(mClient.newCall(mRequest).execute().body().string();
当我无法通过时有人可以向我解释吗？知道我需要它才能继续。
AsyncTask
private class IOAsyncTask extends AsyncTask<String, Void, String> {
private AsyncResponse mDelegate;
public IOAsyncTask(AsyncResponse delegate) {
this.mDelegate = delegate;
}
@Override
protected String doInBackground(String... index) {
try {
int mMaxSize = 50;
for (int i = 20; i < mMaxSize; i += 20) {
RequestBody mFormBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart(ConstantsClass.TRI, "DESC")
.addFormDataPart(ConstantsClass.TRI_COLONNE, "0")
.addFormDataPart(ConstantsClass.STATUT, "2")
.addFormDataPart(ConstantsClass.REPONSE, "0")
.build();
Request mRequest = new Request.Builder()
.url(ConstantsClass.URL_LISTE)
.post(mFormBody)
.build();
Response mResponse = mClient.newCall(mRequest).execute();
if (mResponse.code() != 200) {
this.cancel(true);
ArrayList<Application> mApplicationArray = new ArrayList<>();
mDataCurrentApplication.put(index[0], mApplicationArray);
break;
} else {
mResponseBody = mResponse.body().string();
}
}
} catch (IOException e) {
e.getMessage();
}
return mResponseBody;
}
@Override
protected void onPostExecute(String response) {
try {
JSONArray mJSONArray = new JSONArray(response);
if (mJSONArray.length() != 0) {
for (int i = 0; i < mJSONArray.length(); i++) {
JSONObject mApplicationJSON = mJSONArray.getJSONObject(i);
Application mApplication = new Application(
mApplicationJSON.getInt("ID"),
mApplicationJSON.getString("Reference"),
new Delay(mApplicationJSON.getString("Delai"), mApplicationJSON.getInt("Credits_Utilises"), mApplicationJSON.getString("Date_Reponse_Estime")),
mApplicationJSON.getString("Date_Demande"),
mApplicationJSON.getString("Statut"),
null,
Arrays.asList(mApplicationJSON.getString("Photo")),
new Article(
new Brand(mApplicationJSON.getInt("ID_Marque"), mApplicationJSON.getString("Marque")),
mApplicationJSON.getString("Marque"),
mApplicationJSON.getString("Categorie"),
mApplicationJSON.getString("No_Marquage"),
mApplicationJSON.getString("Attestation")
)
);
mListOfApplications.add(mApplication);
}
} else {
mNoDataTV = (TextView) mView.findViewById(R.id.fragmentAnsweredApplicationNoDataTV);
mNoDataTV.setText(R.string.noData);
}
} catch (JSONException e) {
e.getMessage();
}
try {
mDelegate.processFinish(mListOfApplications);
} catch (IOException | JSONException e) {
e.printStackTrace();
}
}
}
在onPostExecute（）之后立即调用其结果的方法
@Override
public void processFinish(ArrayList output) throws IOException, JSONException {
// Scan the whole tab
for (int i = 0; i < output.size(); i++) {
Application mApplication = (Application) output.get(i);
Request mRequest = new Request.Builder()
.url(ConstantsClass.URL_EXPERTISE + mApplication.getmReference())
.get()
.build();
// CAN'T EXECUTE NEXT LINE
mResponseBody = Objects.requireNonNull(mClient.newCall(mRequest).execute().body()).string();
JSONArray mJSONArray = new JSONArray(mResponseBody);
if (mJSONArray.length() != 0) {
for (int j = 0; j < mJSONArray.length(); j++) {
JSONObject mObject = mJSONArray.getJSONObject(j);
ArrayList<String> mListOfPhotos = new ArrayList<>();
mListOfPhotos.add(mObject.getString("Photo"));
mListOfApplications.get(j).setmListOfViews(mListOfPhotos);
}
}
}
mAdapter.setmListOfApplications(mListOfApplications);
mRecyclerView.setAdapter(mAdapter);
Logcat显示以下内容：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.applicationpro, PID: 28440
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1318)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)
at java.net.SocketOutputStream.write(SocketOutputStream.java:157)
at okio.Okio$1.write(Okio.java:79)
at okio.AsyncTimeout$1.write(AsyncTimeout.java:180)
at okio.RealBufferedSink.flush(RealBufferedSink.java:224)
at okhttp3.internal.http1.Http1Codec.finishRequest(Http1Codec.java:166)
at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:84)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at com.burgstaller.okhttp.AuthenticationCacheInterceptor.intercept(AuthenticationCacheInterceptor.java:50)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
at okhttp3.RealCall.execute(RealCall.java:92)
at com.example.applicationpro.fragment.CurrentApplicationFragment.processFinish(CurrentApplicationFragment.java:119)
at com.example.applicationpro.fragment.CurrentApplicationFragment$IOAsyncTask.onPostExecute(CurrentApplicationFragment.java:226)
at com.example.applicationpro.fragment.CurrentApplicationFragment$IOAsyncTask.onPostExecute(CurrentApplicationFragment.java:140)
at android.os.AsyncTask.finish(AsyncTask.java:660)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:677)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6361)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
答案 0 :(得分：0)
在 processFinish（）方法下
您正在尝试通过以下行进行网络通话。
// CAN'T EXECUTE NEXT LINE
mResponseBody = Objects.requireNonNull(mClient.newCall(mRequest).execute().body()).string();
processFinish（）在UI线程上运行，不允许调用网络操作。仅在 doInBackground（）方法中允许网络操作。
答案 1 :(得分：0)
在完成Asynctask之后，您就创建了一个调用函数的接口，将从UI线程中调用该函数。
但是在您的回调函数中，您将进行另一个引发异常的Networkcall，因为UI线程上禁止进行网络操作。您必须开始通话
mResponseBody = Objects.requireNonNull(mClient.newCall(mRequest).execute().Body()).string();
在另一个Asynctask中，并通过另一个回调接收mResponseBody。