tencent cloud

import android.content.Context;
import com.tencent.cos.xml.*;
import com.tencent.qcloud.core.auth.*;
import com.tencent.qcloud.core.common.*;
import com.tencent.qcloud.core.http.*;
import java.net.*;


Context context = ...;
CosXmlServiceConfig cosXmlServiceConfig = ...;

/**
 * Get the authorization service URL
 */
URL url = null; // URL of the backend authorization service
try{
    url = new URL("your_auth_server_url");
} catch (MalformedURLException e) {
    e.printStackTrace();
}

/**
 * Initialize the {@link QCloudCredentialProvider} object to provide a temporary key to the SDK.
 */
QCloudCredentialProvider credentialProvider = new SessionCredentialProvider(new HttpRequest.Builder<String>()
                .url(url)
                .method("GET")
                .build());

CosXmlService cosXmlService = new CosXmlService(context, cosXmlServiceConfig, credentialProvider);                

import android.content.Context;
import com.tencent.cos.xml.*;
import com.tencent.qcloud.core.auth.*;
import com.tencent.qcloud.core.common.*;
import com.tencent.qcloud.core.http.*;
import java.net.*;


public class MyCredentialProvider extends BasicLifecycleCredentialProvider {

    @Override
    protected QCloudLifecycleCredentials fetchNewCredentials() throws QCloudClientException {

        // First, get the response containing a signature from your temporary key server.
        ....

        // Then, parse the response to get the key.
        String tmpSecretId = ...;
        String tmpSecretKey = ...;
        String sessionToken = ...;
        long expiredTime = ...;

        // Return server time as the start time of the signature.
        long beginTime = ...;

        // todo something you want

        // Finally return the temporary key info. 
        return new SessionQCloudCredentials(tmpSecretId, tmpSecretKey, sessionToken, beginTime, expiredTime);
    }
}