Retrofit Android Application Example

Hello friends
today we are going to learn about RETROFIT in android. it's s REST API in java and android. it's an easy way to upload and store json formate API data in an android application. Retrofit is a REST Client for Android and Java by Square. Let's take an example of this in android.

We need to add some dependencies in our gradle file.

compile 'com.google.code.gson:gson:2.6.2'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
compile 'com.squareup.okhttp3:okhttp:3.4.1'

APIForClient.java

public class APIForClient {
    private static Retrofit retrofit = null;
    static Retrofit getApiCllient() {
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();
        retrofit = new Retrofit.Builder()
                .baseUrl("https://demorequest/")
                .addConverterFactory(GsonConverterFactory.create())
                .client(client)
                .build();


        return retrofit;
    }
}


APIInterface.java

public interface APIInterface {
    @GET("/api/unknown")
    Call<UserDetails> doGetListResources();
}

UserDetails.java

This is our pojo class for store api json response in android.

public class UserDetails {
    @SerializedName("fname")
    public Integer fname;
    @SerializedName("mname")
    public Integer mname;
    @SerializedName("lname")
    public Integer lname;

    public Integer getFname() {
        return fname;
    }

    public void setFname(Integer fname) {
        this.fname = fname;
    }

    public Integer getMname() {
        return mname;
    }

    public void setMname(Integer mname) {
        this.mname = mname;
    }

    public Integer getLname() {
        return lname;
    }

    public void setLname(Integer lname) {
        this.lname = lname;
    }
}



MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        apiInterface = APIForClient.getApiCllient().create(APIInterface.class);
        retrofit2.Call<UserDetails> call = apiInterface.doGetListResources();
        call.enqueue(new Callback<UserDetails>() {
            @Override
            public void onResponse(retrofit2.Call<UserDetails> call, Response<UserDetails> response) {
                //Store response data
            }

            @Override
            public void onFailure(retrofit2.Call<UserDetails> call, Throwable t) {
                //something is wrong
            }
        });
    }
}