How to use the @GET method to make API call?

Question

I'm trying to make a call to youtube data API to retrieve the subscriber count of a particular channel. But I don't know how to implement the API interface and define the endpoints so I pasted my whole remaining URL in the @GET method. But my app is crashing when started.

My complete URL is: https://www.googleapis.com/youtube/v3/channels?part=statistics&id=+UC-lHJZR3Gqxm24_Vd_AJ5Yw&key=AIzaSyAyON6YdgkFrtNHrGGs3IFS4groadJhhts

Here is my interface :

public interface ApiInterface 
{
    @GET("/channels?part=statistics&id=+UC-lHJZR3Gqxm24_Vd_AJ5Yw&key=AIzaSyAyON6YdgkFrtNHrGGs3IFS4groadJhhts")
    Call<Mainjson> getMainJson();
}

Main Activity :

public class MainActivity extends AppCompatActivity 
{
    private Statistics statistics;
    private String subscribers;
    private TextView subscribersPreview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        subscribersPreview=(TextView) findViewById(R.id.textView3);

        ApiInterface service = ApiClient.getClient().create(ApiInterface.class);

        Call<Mainjson> call = service.getMainJson();

        call.enqueue(new Callback<Mainjson>() {
            @Override
            public void onResponse(Call<Mainjson> call, Response<Mainjson> response) {
                List<Items> items = response.body().getItems();
                statistics=items.get(0).getStatistics();
                subscribers=statistics.getSubscriberCount();
                subscribersPreview.setText(subscribers);
            }

            @Override
            public void onFailure(Call<Mainjson> call, Throwable t) {
                Toast.makeText(MainActivity.this,"Failed to retrieve data",Toast.LENGTH_SHORT).show();
            }
        });

    }
}

The retrofit instance :

public class ApiClient {

    public static final String BASE_URL = "https://www.googleapis.com/youtube/v3";
    private static Retrofit retrofit = null;


    public static Retrofit getClient() {
        if (retrofit==null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}

Perhaps you have not added **httpClient or Okhttp** in your retrofit builder (since you are making an httprequest) with `.client()`. — Sheetal gupta, Dec 29 '18 at 04:43
Secondly you should also check for **nullness ** of the text before applying it to any textView so as to handle any network error or system errors — Sheetal gupta, Dec 29 '18 at 04:44
Use this as baseURL:`https://www.googleapis.com` not `https://www.googleapis.com/youtube/v3` this — Prashant Pimpale, Dec 29 '18 at 04:49
and query params as:`?part=statistics&id=+UC-lHJZR3Gqxm24_Vd_AJ5Yw&key=AIzaSyAyON6YdgkFrtNHrGGs3IFS4groadJhhts` — Prashant Pimpale, Dec 29 '18 at 04:51
Have a look at:https://stackoverflow.com/questions/36730086/retrofit-2-url-query-parameter — Prashant Pimpale, Dec 29 '18 at 04:58

score 1 · Accepted Answer · answered Dec 29 '18 at 04:37

problem with BASE_URL. BASE_URL should be end with / and remove / on start of interface method.

public static final String BASE_URL = "https://www.googleapis.com/youtube/v3/";

@GET("channels?part=statistics&id=+UC-lHJZR3Gqxm24_Vd_AJ5Yw&key=AIzaSyAyON6YdgkFrtNHrGGs3IFS4groadJhhts")
Call<Mainjson> getMainJson();

score 0 · Answer 2 · answered Dec 29 '18 at 05:36

0

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answered Dec 29 '18 at 05:36

Chirag Nahar

159
8

How to use the @GET method to make API call?

2 Answers2