我正在尝试使用GET请求调用api，但出现错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.movino, PID: 20106
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.movino/com.example.movino.MainActivity}: java.lang.IllegalArgumentException: Unable to create converter for class com.example.movino.MoviesResponse
for method TMBDApi.getPopular
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: java.lang.IllegalArgumentException: Unable to create converter for class com.example.movino.MoviesResponse
for method TMBDApi.getPopular
at retrofit2.Utils.methodError(Utils.java:52)
at retrofit2.HttpServiceMethod.createResponseConverter(HttpServiceMethod.java:115)
at retrofit2.HttpServiceMethod.parseAnnotations(HttpServiceMethod.java:82)
at retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:37)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170)
at retrofit2.Retrofit$1.invoke(Retrofit.java:149)
at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
at $Proxy0.getPopular(Unknown Source)
at com.example.movino.MoviesRepository.getMovies(MoviesRepository.java:38)
at com.example.movino.MainActivity.onCreate(MainActivity.java:29)
at android.app.Activity.performCreate(Activity.java:7224)
at android.app.Activity.performCreate(Activity.java:7213)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
... 11 more
Caused by: java.lang.IllegalArgumentException: class com.example.movino.Movie declares multiple JSON fields named title
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:170)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:100)
at com.google.gson.Gson.getAdapter(Gson.java:423)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:53)
at com.google.gson.Gson.getAdapter(Gson.java:423)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:115)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:164)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:100)
at com.google.gson.Gson.getAdapter(Gson.java:423)
at retrofit2.converter.gson.GsonConverterFactory.responseBodyConverter(GsonConverterFactory.java:64)
at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:330)
at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:313)
at retrofit2.HttpServiceMethod.createResponseConverter(HttpServiceMethod.java:113)
... 23 more
这是代码：
MainActivity：
public class MainActivity extends AppCompatActivity {
private RecyclerView moviesList;
private MovieAdapter adapter;
private MoviesRepository moviesRepository;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
moviesRepository = MoviesRepository.getInstance();
moviesList = findViewById(R.id.recycler_view);
moviesList.setLayoutManager(new LinearLayoutManager(this));
moviesRepository.getMovies(new OnGetMoviesCallBack() {
@Override
public void onSuccess(List<Movie> movies) {
adapter = new MovieAdapter(movies);
moviesList.setAdapter(adapter);
}
@Override
public void onError() {
Toast.makeText(MainActivity.this, "Please check your internet connection.", Toast.LENGTH_SHORT).show();
}
});
}
}
MovieRepository：
public class MoviesRepository {
public final static String BASE_URL="Base_Url";
public final static String LANGUAGE="en-US";
public static MoviesRepository repository;
private TMBDApi api;
private MoviesRepository(TMBDApi api){
this.api=api;
}
public static MoviesRepository getInstance(){
if(repository==null){
Retrofit retrofit= new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
repository=new MoviesRepository(retrofit.create(TMBDApi.class));
}
return repository;
}
public void getMovies(final OnGetMoviesCallBack callBack){
api.getPopular("api_key",LANGUAGE,1)
.enqueue(new Callback<MoviesResponse>() {
@Override
public void onResponse(Call<MoviesResponse> call, Response<MoviesResponse> response) {
if(response.isSuccessful()){
MoviesResponse moviesResponse=response.body();
if(moviesResponse!=null && moviesResponse.getMovies()!=null){
callBack.onSuccess(moviesResponse.getMovies());
}
else callBack.onError();
}
else callBack.onError();
}
@Override
public void onFailure(Call<MoviesResponse> call, Throwable t) {
callBack.onError();
}
});
}
}
MovieResponse：
public class MoviesResponse {
@SerializedName("page")
@Expose
private int page;
@SerializedName("total_results")
@Expose
private int totalResults;
@SerializedName("results")
@Expose
private List<Movie> movies;
@SerializedName("total_pages")
@Expose
private int totalPages;
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getTotalResults() {
return totalResults;
}
public void setTotalResults(int totalResults) {
this.totalResults = totalResults;
}
public List<Movie> getMovies() {
return movies;
}
public void setMovies(List<Movie> movies) {
this.movies = movies;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
}
使用Gson Converter之后，我仍然收到此错误。在这里，我通过MainActivity调用MovieRepository类。在MovieReposirtory中，我们定义存储库。之后，我们使用api变量获取响应。我不明白该错误。我是api调用的新手，所以我真的需要了解的解决方案。