Help Center/ DataArts Studio/ SDK Reference/ DataArts DataService SDK Reference/ Calling APIs Through App Authentication/ Android
Updated on 2024-06-12 GMT+08:00
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Android

Scenarios

To use Android to call an API through App authentication, obtain the Go SDK, create a project, and then call the API by referring to the API calling example.

Preparing the Environment

  • You have obtained the domain name, request URL, and request method of the API to be called, and the AppKey and AppSecret of the App for calling the API. For more information, see Preparation.
  • You have installed Android Studio. If not, download Android Studio from the official Android Studio website and install it.

Obtaining the SDK

  1. Log in to the DataArts Studio console.
  2. Click DataArts DataService.
  3. In the navigation pane, choose DataArts DataService Exclusive > SDKs.
  4. On the SDKs page, download the SDK package.
  5. Verify integrity of the SDK package. In Windows, open the CLI and run the following command to generate the SHA-256 value of the downloaded SDK package. In the command, D:\java-sdk.zip is an example local path and name of the SDK package. Replace it with the actual value. 

    certutil -hashfile D:\java-sdk.zip SHA256

    The following is an example command output:

    SHA-256 hash value of D:\java-sdk.zip
3a86f1ba249a00727db506e4075ec9630e6cf74f312bddf6c3901c9d0786f53e
CertUtil: -hashfile command executed.
3a86f1ba249a00727db506e4075ec9630e6cf74f312bddf6c3901c9d0786f53e

    Compare the SHA-256 value of the downloaded SDK package with that provided in the following table. If they are the same, no tampering or packet loss occurred during the package download.

    Table 1 SDK packages and the corresponding SHA-256 values

    Language

    SHA-256 Value of the SDK Package

    Java

    3a86f1ba249a00727db506e4075ec9630e6cf74f312bddf6c3901c9d0786f53e

    Go

    23734867eae2e7ef61427c64aa33aa89512571946f2f43a1a5fef5e801e3129f

    Python

    57636d8bacc459cab9dc08c70d01ccc42391ace60e6960c4e947566da1dc5d26

    C#

    e5a3b677f75c28ba3f1e16645d8171f7b6f34a42143f8a32a68bb18719b5e65d

    JavaScript

    442ac2fcb41d84525dc0139ec3f05d190e4e337cdbcdfdfc82a09d79d2ecd25e

    PHP

    2cc76bd2ecd48f00899d18b0f76d05ce2623065180f111c3f70ac14ddf0506f3

    C++

    2a54c3f2486d562ea6af1384eca40b301918bdc02f98bbf2c114f282dc059c00

    C

    4957556c108e0174d55b4b8d720f296967a9367ca54010792b1b3de039b87363

    Android

    0fdcc6fd93a68dce5c3e1b8e6370cc9340429cabfb0f268c3f9e5ea05238ae96

Obtain the ApiGateway-android-sdk.zip package. The following table shows the files decompressed from the package.

Name

Description

app\

Android project code

gradle\

Gradle files

build.gradle

Gradle configuration files

gradle.properties

settings.gradle

gradlew

Gradle Wrapper scripts

gradlew.bat

Opening a Project

  1. Start the Android Studio and choose File > Open.

    Select the directory where the SDK is decompressed.

  2. View the directory structure shown in the following figure.

    Figure 1 Project directory structure

API Calling Example

  1. Add required JAR files to the app/libs directory of the Android project. The following JAR files must be included:

    • java-sdk-core-x.x.x.jar
    • commons-logging-1.2.jar
    • joda-time-2.9.9.jar

  2. Add dependencies of the okhttp library to the build.gradle file.

    Add implementation 'com.squareup.okhttp3:okhttp:3.11.0' in the dependencies field of the build.gradle file. 
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    dependencies {    
    ...
    ...
    implementation 'com.squareup.okhttp3:okhttp:3.11.0'
}

  3. Create a request, enter an AppKey and AppSecret, and specify the domain name, method, request URI, and body. 

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    Request request = new Request();
try {
        // Coded or plaintext AK and SK in code pose significant security risks. You are advised to encrypt and store them in configuration files or environment variables and decrypt them when needed.
        // In this example, the AK and SK stored in the environment variables are used for identity authentication. Before running this example, configure environment variables SDK_AK and SDK_SK in the local environment.
        String ak = System.getenv("SDK_AK");
        String sk = System.getenv("SDK_SK");

        request.setKey(ak);
        request.setSecret(sk);

	request.setMethod("POST");
	request.setUrl("https://{apig-endpoint}/app1");
	request.addQueryStringParam("name", "value");
	request.addHeader("Content-Type", "text/plain");
        request.addHeader("name", "value");
	request.setBody("demo");
} catch (Exception e) {
	e.printStackTrace();
	return;
}

  4. Sign the request and add the x-Authorization header to the request. The value of the x-Authorization header is the same as that of the Authorization header. The okhttp3.Request object is then generated to access the API. 

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    okhttp3.Request signedRequest = Client.signOkhttp(request);
String authorization = signedRequest.header("Authorization");
signedRequest = signedRequest.newBuilder().addHeader("x-Authorization",authorization).build();
OkHttpClient client = new OkHttpClient.Builder().build();
Response response = client.newCall(signedRequest).execute();