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How to handle network connectivity issues in OKHTTP in Kotlin Android

How to handle network connectivity issues in OKHTTP in Kotlin Android.

Here's a detailed step-by-step tutorial on how to handle network connectivity issues in OKHTTP in Kotlin for Android.

Step 1: Add dependencies​

First, you need to add the OKHTTP library to your project. Open your app-level build.gradle file and add the following dependency:

dependencies {
    implementation 'com.squareup.okhttp3:okhttp:4.9.1'
}

Sync your project to make sure the library is added successfully.

Step 2: Check network connectivity​

To handle network connectivity issues, you need to check if the device is connected to the internet. You can use the following method to check connectivity:

fun isNetworkAvailable(context: Context): Boolean {
    val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val networkInfo = connectivityManager.activeNetworkInfo
    return networkInfo != null && networkInfo.isConnected
}

Make sure to replace context with the appropriate context object.

Step 3: Create an OkHttpClient instance​

Next, you need to create an instance of OkHttpClient. This class is responsible for making HTTP requests. You can configure it to handle network connectivity issues by setting a custom Interceptor. Here's an example:

val client = OkHttpClient.Builder()
    .addInterceptor { chain ->
        val request = chain.request()
        if (!isNetworkAvailable(context)) {
            throw NoConnectivityException("No internet connection")
        }
        chain.proceed(request)
    }
    .build()

In this example, we add an interceptor that checks the network connectivity before making any request. If there is no internet connection, we throw a custom NoConnectivityException.

Step 4: Make a request​

Now that you have your OkHttpClient instance, you can use it to make HTTP requests. Here's an example of making a GET request to a URL:

val request = Request.Builder()
    .url("https://api.example.com/data")
    .build()

client.newCall(request).enqueue(object : Callback {
    override fun onFailure(call: Call, e: IOException) {
        // Handle network failure
    }

    override fun onResponse(call: Call, response: Response) {
        // Handle response
    }
})

In the onFailure method, you can handle network failure, such as displaying an error message to the user. In the onResponse method, you can handle the response data.

Step 5: Handle network connectivity exceptions​

To handle the custom NoConnectivityException that we threw earlier, you can catch it when making the request. Here's an example:

try {
    client.newCall(request).enqueue(object : Callback {
        // ...
    })
} catch (e: NoConnectivityException) {
    // Handle no connectivity exception
}

In this example, we catch the NoConnectivityException and handle it accordingly.

That's it! You now know how to handle network connectivity issues in OKHTTP in Kotlin for Android.