(Android™) URL Signing for Google Maps API

Demonstrates how to sign a URL for the Google Maps API.

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

    CkCrypt2 crypt = new CkCrypt2();

    // The output will be modified Base64.
    // Modified Base64 for URLs replaces the '+' and '/' characters 
    // of standard Base64 with '-' and '_' respectively, so that these 
    // Base64 signatures no longer need to be URL-encoded.
    crypt.put_EncodingMode("modBase64");

    // Set the hash algorithm to sha-1
    crypt.put_HashAlgorithm("sha-1");

    String sig;

    // Set the HMAC key (this is the private key provided by Google)
    crypt.SetHmacKeyEncoded("vNIXE0xscrmjlyV-12Nj_BvUPaw=","modBase64");

    // Compute the URL signature
    sig = crypt.hmacStringENC("/maps/api/geocode/json?address=New+York&sensor=false&client=clientID");

    // The result should be KrU1TzVQM7Ur0i8i7K3huiw3MsA=
    Log.i(TAG, sig);

  }

  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."
  }
}