I asked :

I am designing an application using android studio, to track heart rate using fitbit smart watch,

I register application: for Fitbit API, i have OAuth 2.0 Client ID, Client Secret , access token

but i need code in android studio java ,Because I can't find anything on the internet about connecting via android studio with java.

your solution :

but i want ask :

in your code , i dont see use anythings from access token and client id and secert, moreover , there some error

@GET("1/user/-/activities/heart/date/{date}/1d.json") ; get not found 

To connect to the Fitbit API using Android Studio and Java, you can use the following steps:

Add the required dependencies to your project. You will need to add the following dependencies to your app-level build.gradle file:

implementation 'com.squareup.okhttp3:okhttp:4.9.2'

implementation 'com.squareup.okhttp3:logging-interceptor:4.9.2'

implementation 'com.google.code.gson:gson:2.8.8'

EXPLANATION

Here adding required dependencies

Step 2/4

For example, if you want to retrieve the user's heart rate data, you can create a service interface like this:

public interface FitbitService {

@GET("1/user/-/activities/heart/date/{date}/1d.json")

Call getHeartRateData(@Path("date") String date);

}

This interface defines a method to retrieve the heart rate data for a specific date.

EXPLANATION

Creating a Retrofit service interface to define the API endpoints you want to use.

Step 3/4

Create an instance of the Retrofit object and configure it with your Fitbit API credentials. For example:

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

httpClient.addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY));

Retrofit retrofit = new Retrofit.Builder()

.baseUrl("https://api.fitbit.com/")

.addConverterFactory(GsonConverterFactory.create())

.client(httpClient.build())

.build();

FitbitService service = retrofit.create(FitbitService.class);

EXPLANATION

This code creates an instance of the OkHttpClient, sets up logging, and creates an instance of the Retrofit object with the base URL of the Fitbit API and a Gson converter factory

Step 4/4

Call the API endpoint using the service interface you defined earlier. For example:

Call call = service.getHeartRateData("2022-03-03");

call.enqueue(new Callback() {

@Override

public void onResponse(Call call, Response response) {

if (response.isSuccessful()) {

HeartRateData heartRateData = response.body();

// Process heart rate data

} else {

// Handle error

}

}

@Override

public void onFailure(Call call, Throwable t) {

// Handle error

}

});

EXPLANATION

This code calls the getHeartRateData() method on the service interface, passing in the desired date, and then processes the response using the onResponse() method of the Callback interface.