Question

I am trying to use the Google generated API library for the first time for Android. I have taken code from the the Sample Program provided by Google. My code looks like

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import android.app.Activity;
import android.os.Bundle;

// Core Google API
import com.google.api.client.auth.oauth2.draft10.AccessTokenResponse;
import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAccessProtectedResource;
import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAccessTokenRequest.GoogleAuthorizationCodeGrant;
import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAuthorizationRequestUrl;
import com.google.api.client.http.ByteArrayContent;
import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestFactory;
import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson.JacksonFactory;

// Google+ API
import com.google.api.services.plus.*;

public class GooglePlusActivity extends Activity {

    // Want data about authenticated user
    private static final String SCOPE = "https://www.googleapis.com/auth/plus.me";
    //
    private static final String CALLBACK_URL = "urn:ietf:wg:oauth:2.0:oob";
    //
    private static final HttpTransport TRANSPORT = new NetHttpTransport();
    private static final JsonFactory JSON_FACTORY = new JacksonFactory();

    private static final String CLIENT_ID = "XXXXXXXXXXXXXXX";
    private static final String CLIENT_SECRET = "XXXXXXXXXXXXXX";

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

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Generate the URL to which we will direct users
        String authorizeUrl = new GoogleAuthorizationRequestUrl(CLIENT_ID,
                CALLBACK_URL, SCOPE).build();

        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

        try {
            String authorizationCode = in.readLine();

            // Exchange for an access and refresh token
            GoogleAuthorizationCodeGrant authRequest = new GoogleAuthorizationCodeGrant(TRANSPORT,
                JSON_FACTORY, CLIENT_ID, CLIENT_SECRET, authorizationCode, CALLBACK_URL);

            authRequest.useBasicAuthorization = false;

            AccessTokenResponse authResponse = authRequest.execute();

            String accessToken = authResponse.accessToken;

            GoogleAccessProtectedResource access = new GoogleAccessProtectedResource(accessToken,
                TRANSPORT, JSON_FACTORY, CLIENT_ID, CLIENT_SECRET, authResponse.refreshToken);

            HttpRequestFactory rf = TRANSPORT.createRequestFactory(access);
            System.out.println("Access token: " + authResponse.accessToken);


        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Plus plus = new Plus(new NetHttpTransport(), new JacksonFactory());

    }
}

However the following line:

private static final HttpTransport TRANSPORT = new NetHttpTransport();

cause an exception:

10-04 13:33:28.954: ERROR/AndroidRuntime(5925): Caused by: java.lang.NoClassDefFoundError: com.google.api.client.http.javanet.NetHttpTransport

I have the following libraries added to the build path:

google-api-client-1.5.0-beta.jar
google-api-services-plus-v1-1.2.2-beta.jar

and these dependency libraries:

guava-r09
httpclient-4.0.3
jackson-core-asl-1.6.7
gson-1.6

I added the dependencies only out of desperation…since I cannot see that I need them. All my import statements are resolved correctly at compile time, so why would I get this error?

I’m using Eclipse Indigo on Windows 7.

I added the following jar files:

google-api-client-1.5.0-beta
google-api-client-extensions-1.5.0-beta
google-api-client-extensions-android2-1.5.0-beta
google-api-services-plus-v1-1.2.2-beta
google-http-client-1.5.0-beta
google-http-client-extensions-1.5.0-beta
google-http-client-extensions-android2-1.5.0-beta
google-oauth-client-1.5.0-beta
google-oauth-client-extensions-1.5.0-beta
gson-1.6
guava-r09
httpclient-4.0.3
httpcore-4.0.1
jackson-core-asl-1.6.7

this resolved my problem. However I am still unsure about how these files correspond to the libraries list on the wiki page and also why they’re required when my imports are resolved during compile time.

Answer 1

You must explicit add library reference of google-http-client-1.5.0-beta.jar(right click project->Properties->Java Build Path->Add External JARs), don’t believe class path.
If you do not do this, in the apk file does not contain the required data。
You can download Google plus library from here google-plus-java-starter_v5.zip