I'm new with retrofit and I want to make my getData method to return a feature object. What is the easiest way to do that?
DataService.java
public class DataService {
private static final String TAG = MainActivity.class.getSimpleName();
private final ApiClient apiClient;
public DataService() {
apiClient = new ApiClientFactory().createApiClient();
}
public List<Feature> getData(){
apiClient.getData().enqueue(new Callback<DataResponse>() {
@Override
public void onResponse(Call<DataResponse> call, Response<DataResponse> response) {
List<Feature> features = response.body().getFeatures();
Log.d(TAG, "Data successfully downloaded");
}
@Override
public void onFailure(Call<DataResponse> call, Throwable t) {
Log.e(TAG, t.toString());
}
});
//I need to return features in getData method
}
}
You can't return, you must "call back".
Extract that inner Callback class to a parameter.
public void getData(Callback<DataResponse> callback){
apiClient.getData().enqueue(callback);
}
In your other code
// DataService service = ...;
// Define Callback
Callback<DataResponse> responseCallback = new Callback<DataResponse>() {
@Override
public void onResponse(Call<DataResponse> call, Response<DataResponse> response) {
List<Feature> features = response.body().getFeatures();
Log.d(TAG, "Data successfully downloaded");
// Data is returned here
for (Feature f: features) {
Log.d("feature", String.valueOf(f)); // for example
}
}
@Override
public void onFailure(Call<DataResponse> call, Throwable t) {
Log.e(TAG, t.toString());
}
};
// Call it
service.getData(responseCallback);
You can also do service.getData(new Callback<DataResponse>() { ... });