How to Convert Base64 Value into Hexa Decimal String and Send that Hexa Decimal String to Server by Using Volley in Java Android

Base64 encoding is commonly used to convert binary data into a text format, which is easily transmitted over the network. However, in certain scenarios, it may be necessary to convert the Base64 value into a hexadecimal string before sending it to the server. In this article, we will explore how to achieve this conversion and send the hexadecimal string using Volley, a popular networking library in Java Android.

Converting Base64 to Hexadecimal String

To convert a Base64 value into a hexadecimal string, we can follow these steps:

1. Decode the Base64 value to obtain the binary data.
2. Convert the binary data into a hexadecimal string.

Let's take a look at the code snippet below:

import java.util.Base64;

public class Base64ToHexConverter {
    public static String convert(String base64Value) {
        byte[] decodedBytes = Base64.getDecoder().decode(base64Value);
        return bytesToHex(decodedBytes);
    }

    private static String bytesToHex(byte[] bytes) {
        StringBuilder hexString = new StringBuilder();
        for (byte b : bytes) {
            hexString.append(String.format("%02x", b));
        }
        return hexString.toString();
    }
}

In the code above, we first decode the Base64 value using the Base64.getDecoder().decode() method provided by the java.util.Base64 class. Then, we convert the decoded bytes into a hexadecimal string using the bytesToHex() method.

Sending Hexadecimal String to Server using Volley

Now that we have the hexadecimal string, we can proceed to send it to the server using Volley. Volley provides an easy-to-use API for making network requests.

Here's an example of how to send the hexadecimal string to the server:

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

public class HexStringSender {
    public static void send(String hexString) {
        RequestQueue queue = Volley.newRequestQueue(context);
        String url = "http://example.com/api";

        StringRequest request = new StringRequest(Request.Method.POST, url,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        // Handle response from the server
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        // Handle error
                    }
                }) {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<>();
                params.put("hexString", hexString);
                return params;
            }
        };

        queue.add(request);
    }
}

In the code snippet above, we create a StringRequest object with the desired HTTP method, URL, and response/error listeners. We override the getParams() method to include the hexadecimal string as a parameter in the request. Finally, we add the request to the Volley request queue using queue.add(request).

And that's it! We have successfully converted the Base64 value into a hexadecimal string and sent it to the server using Volley.

Conclusion

Converting a Base64 value into a hexadecimal string and sending it to the server is a common requirement in certain scenarios. By following the steps outlined in this article, you can easily achieve this conversion and use Volley to send the hexadecimal string. So go ahead and give it a try in your next Java Android project!

References

• java.util.Base64 - Java SE 11 Documentation
• Volley - Android Developers

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