我已经建立了一个RetroFitService来返回一些对象。在MainActivity中,我通过简单的按钮点击调用服务。我似乎得到了某种对象,但我感觉它实际上并没有从我指定的REST API返回。它出现在调试器中,但其属性为null:
bFetch.setOnClickListener(v -> {
v.startAnimation(AnimationUtils.loadAnimation(this, R.anim.image_click));
RetrofitService service = ServiceFactory.createRetrofitService(RetrofitService.class, RetrofitService.SERVICE_ENDPOINT);
service.getPosts()
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber < Post > () {
@Override
public final void onCompleted() {
Log.e("RetrofitService", "Retrofit Request Completed!");
}
@Override
public final void onError(Throwable e) {
Log.e("RetrofitService", e.getMessage());
}
@Override
public final void onNext(Post post) {
if (post != null) {
// TODO: Some object is returned but its properties are null
Log.e("RetrofitService", "Returned objects: " + post);
Log.e("RetrofitService", "Object Id: " + post.getObjectId());
mCardAdapter.addData(post);
} else {
Log.e("RetrofitService", "Object returned is null.");
}
}
});
});
}
Service:
public interface RetrofitService {
String SERVICE_ENDPOINT = "https://parseapi.back4app.com/";
@Headers({
"X-Parse-Application-Id: asdf",
"X-Parse-REST-API-Key: asdf"
})
@GET("/classes/Post")
Observable < Post > getPosts();
/*curl -X GET \
-H "X-Parse-Application-Id: asdf" \
-H "X-Parse-REST-API-Key: asdf" \
https://parseapi.back4app.com/classes/Post*/
}
curl命令很好用,我没有遇到任何错误。问题可能出在哪里?我的@GET
方法有问题吗?
为了完整起见,这是ServiceFactory类:
public class ServiceFactory {
/**
* Creates a retrofit service from an arbitrary class (clazz)
* @param clazz Java interface of the retrofit service
* @param endPoint REST endpoint url
* @return retrofit service with defined endpoint
*/
public static <T> T createRetrofitService(final Class<T> clazz, final String endPoint) {
final RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(endPoint)
.build();
T service = restAdapter.create(clazz);
return service;
}
}
我的build.gradle文件,因为我知道不同版本的Retrofit存在不一致性:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
/* ReactiveX */
compile 'io.reactivex:rxjava:1.0.17'
compile 'io.reactivex:rxandroid:0.23.0'
/* Retrofit */
compile 'com.squareup.retrofit:retrofit:1.9.0'
/* OkHttp3 */
compile 'com.squareup.okhttp3:okhttp:3.8.1'
/* RecylerView */
compile 'com.android.support:recyclerview-v7:25.3.1'
/* CardView */
compile 'com.android.support:cardview-v7:25.3.1'
/* Parse */
compile 'com.parse:parse-android:1.13.0'
}
文章类:
public class Post implements Serializable {
private static final String CLASS_NAME = "Post";
private String objectId;
private String text;
public Post(String objectId) {
this.setObjectId(objectId);
}
public static String getClassName() {
return CLASS_NAME;
}
public String getObjectId() {
return objectId;
}
private void setObjectId(String objectId) {
this.objectId = objectId;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
响应结果:
> https://parseapi.back4app.com/classes/Post/
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 259 100 259 0 0 360 0 --:--:-- --:--:-- --:--:-- 395{"results":[{"objectId":"ktEfgr1pFt","text":"Hello World.","createdAt":"2017-08-14T14:07:52.826Z","updatedAt":"2017-08-14T14:07:52.826Z"},{"objectId":"Mmh8l9gjCk","text":"Hello?","createdAt":"2017-08-14T15:19:01.515Z","updatedAt":"2017-08-14T15:19:03.743Z"}]}
最终更新:我已经修改了RetrofitService
的onNext()
方法,使其能够传递给CardAdapter
,尽管这里没有显示它,并超出了问题的范围。
@Override
public final void onNext(PostResponse postResponse) {
if (postResponse != null) {
// TODO: Some object is returned but its properties are null
Log.e("RetrofitService", "Objects successfully added to RecyclerView Adapter.");
Log.e("RetrofitService", "Returned objects: " + postResponse.getResults());
Log.e("RetrofitService", "Text " + postResponse.getResults().get(0).getText());
mCardAdapter.addData(postResponse);
//
} else {
Log.e("RetrofitService", "Object returned is null.");
}
}