[英]Android failed GET retrofit API call to server
我正在開發一個Android項目。 我正在使用改型來調用API。 因此,我正在進行API調用以獲取與證書相關的課程列表。
來自服務器get(BASE_URL / certificates / 1)的響應是:
{
"id": 1,
"name": "Arts-certificate",
"authorized_by": "priya",
"created_by": "self",
"created_by_id": "1",
"description": "awarded to the best",
"doc_url": "http://f8rentals.com/wp-content/uploads/2015/03/IMG_0067ft.jpg?189db0",
"category_id": "2",
"cateogory": "Arts",
"courses": [
{
"id": 1,
"course_id": "CRSXQHGZ0SCTLhklhk6JL",
"number_of_sessions": 1,
"created_at": "2015-12-16T07:10:37.000+00:00",
"updated_at": "2015-12-16T07:10:37.000+00:00",
"tags": null
},
{
"id": 1,
"course_id": "CRSXQHGZ0SCTLhklhk6JL",
"number_of_sessions": 1,
"created_at": "2015-12-16T07:10:37.000+00:00",
"updated_at": "2015-12-16T07:10:37.000+00:00",
"tags": null
}
.
.
.
.
]
}
我有證書列表,並且需要采取的措施是,在單擊證書后,它應該轉到具有與該證書相關聯的所有課程的新片段(在其中單擊)。 為此,我進行了上述API調用。
問題是,當我單擊列表中的第一個證書時,它將轉到下一個片段並列出所有課程。 但是,當我單擊任何其他證書時,它將顯示空白片段。 當我調試代碼時,在fetchCourses() CoursesListOfCertificatesFragment.java中 ,將調用onFailure()函數。
工作流程為CertificateFragment是列出所有證書的類。 單擊后,會觸發CertificateFragment中的CertificateClickListner()並依次啟動CoursesListOfCertificatesFragment,並在此片段的構造函數中傳遞證書對象。 在這里,我將API調用為GET(BASE_URL / certificates / 1)。
這在CoursesListOfCertificatesFragment中的fetchCourses()中。 但是,除了第一個證書之外,還會調用onFailure()方法。
感謝您的幫助。....如果需要其他信息,請詢問。
謝謝。
以下是列出的相關類別:
CoursesListOfCertificatesFragment.java
package com.localjini.learner.fragments;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.localjini.learner.R;
import com.localjini.learner.adapters.CourseListingRVAdapter;
import com.localjini.learner.api.RestClient;
import com.localjini.learner.main.HomeActivity;
import com.localjini.learner.models.Certificates;
import com.localjini.learner.models.Course;
import com.localjini.learner.models.CoursesResponse;
import com.localjini.learner.models.GetCertificateResponse;
import com.localjini.learner.utils.LogUtils;
import com.localjini.learner.utils.UIHelper;
import java.util.List;
import butterknife.Bind;
import butterknife.ButterKnife;
import retrofit.Call;
import retrofit.Callback;
import retrofit.Response;
import retrofit.Retrofit;
public class CoursesListOfCertificatesFragment extends BaseFragment {
@Bind(R.id.tv_category)
TextView tvCategory;
@Bind(R.id.tv_sort_filter)
TextView tvSortFilter;
@Bind(R.id.pb_course_listing)
ProgressBar pbCourseListing;
@Bind(R.id.rv_course_listing)
RecyclerView rvCourseListing;
public UIHelper uiHelper;
List<Course> courses;
private Certificates certificate;
private int certificate_id;
public CoursesListOfCertificatesFragment(){
}
private CourseListingRVAdapter.CourseClickListener listener = new CourseListingRVAdapter.CourseClickListener() {
@Override
public void onCourseClicked(Course course) {
interactionListener.launchCourseDetailFragment();
}
};
public CoursesListOfCertificatesFragment(Certificates certificate){
this.certificate = certificate;
this.certificate_id = certificate.getId();
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (root == null) {
root = (ViewGroup) inflater.inflate(R.layout.fragment_course_listing, container, false);
ButterKnife.bind(this, root);
initInstances();
fetchCourses();
}
return root;
}
private void initInstances() {
uiHelper = new UIHelper(getActivity());
((HomeActivity) getActivity()).getSupportActionBar().setHomeButtonEnabled(true);
((HomeActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
((HomeActivity) getActivity()).getSupportActionBar().setTitle("");
rvCourseListing.setItemAnimator(new DefaultItemAnimator());
rvCourseListing.setLayoutManager(new LinearLayoutManager(getActivity()));
rvCourseListing.setHasFixedSize(true);
}
private void fetchCourses() {
Call<GetCertificateResponse> call = RestClient.getCMSServiceInstance().getCertificateById(certificate_id);
call.enqueue(new Callback<GetCertificateResponse>() {
@Override
public void onResponse(Response<GetCertificateResponse> response, Retrofit retrofit) {
if (response != null) {
GetCertificateResponse resp = response.body();
if (resp != null) {
showCourses(resp.getCourses());
} else {
uiHelper.showToast("response contain null data");
}
}
}
@Override
public void onFailure(Throwable t) {
LogUtils.d("coursesFailed", t.getMessage());
}
});
}
private void showCourses(List<Course> courses) {
if(courses != null) {
CourseListingRVAdapter courseListingRVAdapter = new CourseListingRVAdapter(getActivity(), courses);
courseListingRVAdapter.setCourseClickListener(listener);
rvCourseListing.setAdapter(courseListingRVAdapter);
}
}
public FragmentId getFragmentId() {
return FragmentId.COURSE_LISTING_FRAGMENT;
}
}
CertificateFragment.java
public class CertificateFragment extends BaseFragment {
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
//protected ViewGroup root;
protected Context context;
@Bind(R.id.rv_Certificates) RecyclerView rvCertificates;
private CertificateRVAdapter.CertificateClickListener listener = new CertificateRVAdapter.CertificateClickListener() {
@Override
public void onCertificateClicked(Certificates certificate) {
Toast.makeText(getActivity(), certificate.getName() +" Clicked", Toast.LENGTH_SHORT).show();
//interactionListener.launchCourseListingFragment();
interactionListener.launchCoursesListOfCertificatesFragment(certificate);
}
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(root==null) {
root = (ViewGroup) inflater.inflate(R.layout.fragment_certificate, container, false);
ButterKnife.bind(this, root);
initInstances();
getCertificates();
}
return root;
}
// rvCourseListing.setItemAnimator(new DefaultItemAnimator());
// rvCourseListing.setLayoutManager(new LinearLayoutManager(getActivity()));
// rvCourseListing.setHasFixedSize(true);
//
private void initInstances() {
//uiHelper = new UIHelper(getActivity());
((HomeActivity) getActivity()).getSupportActionBar().setHomeButtonEnabled(true);
((HomeActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
((HomeActivity) getActivity()).getSupportActionBar().setTitle("");
rvCertificates.setItemAnimator(new DefaultItemAnimator());
rvCertificates.setLayoutManager(new LinearLayoutManager(getActivity()));
rvCertificates.setHasFixedSize(true);
}
private void getCertificates() {
Call<AllCertificateResponse> call = RestClient.getCMSServiceInstance().getCertificates();
call.enqueue(new Callback<AllCertificateResponse>() {
@Override
public void onResponse(Response<AllCertificateResponse> response, Retrofit retrofit) {
if (response.isSuccess()) {
//com.squareup.okhttp.Response raw = response.body().raw();
List<Certificates> certificates = response.body().getCertificates();
if (certificates != null)
showCertificates(certificates);
Toast.makeText(getActivity(), "Success in getting certificates", Toast.LENGTH_SHORT).show();
} else {
Log.d("CERT", "response is failure");
}
}
@Override
public void onFailure(Throwable t) {
Toast.makeText(getActivity(), "Failure", Toast.LENGTH_SHORT).show();
}
});
}
public void showCertificates(List<Certificates> certificates){
CertificateRVAdapter adapter = new CertificateRVAdapter(getActivity(), certificates);
adapter.setCertificateClickListener(listener);
rvCertificates.setAdapter(adapter);
}
public FragmentId getFragmentId() {
return FragmentId.COURSE_LISTING_FRAGMENT;
}
}
我解決了這個問題。 事實證明服務器給出了錯誤的響應(它仍處於測試階段)。 我期待的是字符串數組。 對於第一個證書,所有課程都具有字符串數組,但是對於第二個以后,所有課程都具有字符串值而不是數組。
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