(Android™) REST with Query Params

See more REST Examples

Demonstrates how to add query params for a REST request.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Let's say we want to send a GET request to 
    // https://example.com/search?query=hello%20world&category=books&sortBy=price&filterBy=inStock

    // Notice that the query parameter values must be URL encoded.

    // Let's also explain the parts of the above URL:

    //     Scheme: https
    //         The scheme specifies the protocol used to access the resource. 
    //         In this case, it is "https," which indicates that the resource is accessed using the Hypertext Transfer Protocol Secure (HTTPS).
    // 
    //     Host: example.com
    //         The host part of the URL identifies the domain name or IP address of the server hosting the resource. In this case, "example.com" is the host.
    // 
    //     Path: /search
    //         The path is the specific location or resource on the server that the client wants to access. 
    //         In this URL, the path is "/search," indicating that the client is requesting the "search" resource on the server.
    // 
    //     Query Parameters:
    //         Query parameters are used to send additional data to the server as key-value pairs. 
    //         They are separated from the path by a question mark ? and each parameter is separated by an ampersand &.
    // 
    //         The above URL has four query parameters:
    //             query=hello%20world: The "query" parameter with the value "hello world". The %20 represents the URL-encoded space character in the value.
    //             category=books: The "category" parameter with the value "books".
    //             sortBy=price: The "sortBy" parameter with the value "price".
    //             filterBy=inStock: The "filterBy" parameter with the value "inStock".

    CkRest rest = new CkRest();

    // Connect to the REST server.

    // The Host part of the URL is passed in the 1st argument.
    // The Scheme part of the URL ("https") is indicated by the 2nd and 3rd arguments (port and bTls).
    boolean bTls = true;
    int port = 443;
    boolean bAutoReconnect = true;
    boolean success = rest.Connect("example.com",port,bTls,bAutoReconnect);

    // There are 3 ways to send the above GET request.

    // 1) Send the request with path and query params pre-built, where the query param values are URL encoded.
    String responseJson = rest.fullRequestNoBody("GET","/search?query=hello%20world&category=books&sortBy=price&filterBy=inStock");
    if (rest.get_LastMethodSuccess() != true) {
        Log.i(TAG, rest.lastErrorText());
        return;
        }

    // 2) Pass only the Path part of the URL, and specify the query params separately by calling AddQueryParams beforehand.
    //    Again, the query params must be already URL encoded when passed to AddQueryParams
    rest.ClearAllQueryParams();
    rest.AddQueryParams("query=hello%20world&category=books&sortBy=price&filterBy=inStock");
    responseJson = rest.fullRequestNoBody("GET","/search");
    // ...
    // ...

    // 3) Pass each query parameter separately by calling AddQueryParam.  In this case, the query param value should be passed without URL encoding.
    //    (ClearAllQueryParams ensures any params set for previous request are cleared.)
    rest.ClearAllQueryParams();
    rest.AddQueryParam("query","hello world");
    rest.AddQueryParam("category","books");
    rest.AddQueryParam("sortBy","price");
    rest.AddQueryParam("filterBy","inStock");
    responseJson = rest.fullRequestNoBody("GET","/search");
    // ...
    // ...

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}