AsyncTask Android OAuth2Client 的方法

Question

我正在尝试使用此代码：

public static Token getAccessToken(OAuth2Config oauthDetails) {
    HttpPost post = new HttpPost(oauthDetails.getTokenEndPointUrl());
    String clientId = oauthDetails.getClientId();
    String clientSecret = oauthDetails.getClientSecret();
    String scope = oauthDetails.getScope();
    List<BasicNameValuePair> parametersBody = new ArrayList<BasicNameValuePair>();
    parametersBody.add(new BasicNameValuePair(OAuthConstants.GRANT_TYPE,
            oauthDetails.getGrantType()));
    parametersBody.add(new BasicNameValuePair(OAuthConstants.USERNAME,
            oauthDetails.getUsername()));
    parametersBody.add(new BasicNameValuePair(OAuthConstants.PASSWORD,
            oauthDetails.getPassword()));
    if (isValid(clientId)) {
        parametersBody.add(new BasicNameValuePair(OAuthConstants.CLIENT_ID,
                clientId));
    }
    if (isValid(clientSecret)) {
        parametersBody.add(new BasicNameValuePair(
                OAuthConstants.CLIENT_SECRET, clientSecret));
    }
    if (isValid(scope)) {
        parametersBody.add(new BasicNameValuePair(OAuthConstants.SCOPE,
                scope));
    }
    DefaultHttpClient client = new DefaultHttpClient();
    HttpResponse response = null;
    Token accessToken = null;
    try {
        post.setEntity(new UrlEncodedFormEntity(parametersBody, HTTP.UTF_8));
        response = client.execute(post);
        int code = response.getStatusLine().getStatusCode();
        if (code >= 400) {
            Log.d(TAG, "Authorization server expects Basic authentication");
                // Add Basic Authorization header
            post.addHeader(
                    OAuthConstants.AUTHORIZATION,
                    getBasicAuthorizationHeader(oauthDetails.getUsername(),
                            oauthDetails.getPassword()));
            Log.d(TAG, "Retry with login credentials");
            try {
                response.getEntity().consumeContent();
            } catch (IOException e) {
                    // TODO Auto-generated catch block
                e.printStackTrace();
            }
            response = client.execute(post);
            code = response.getStatusLine().getStatusCode();
            if (code >= 400) {
                Log.d(TAG, "Retry with client credentials");
                post.removeHeaders(OAuthConstants.AUTHORIZATION);
                post.addHeader(
                        OAuthConstants.AUTHORIZATION,
                        getBasicAuthorizationHeader(
                                oauthDetails.getClientId(),
                                oauthDetails.getClientSecret()));
                try {
                    response.getEntity().consumeContent();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                response = client.execute(post);
                code = response.getStatusLine().getStatusCode();
                if (code >= 400) {
                    throw new RuntimeException(
                            "Could not retrieve access token for user: "
                                    + oauthDetails.getUsername());
                }
            }
        }
        Map map = handleResponse(response);
        accessToken = new Token(Long.valueOf((Integer) map.get(OAuthConstants.EXPIRES_IN)), (String) map.get(OAuthConstants.TOKEN_TYPE), (String) map.get(OAuthConstants.REFRESH_TOKEN), (String) map.get(OAuthConstants.ACCESS_TOKEN));
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
           // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return accessToken;
}

是我在我的 Android 应用程序中使用的 OAuth2Client 的一部分。 我收到此错误：

android.os.NetworkOnMainThreadException

我正在阅读我应该使用 AsyncTask，但我不知道如何将此方法转换为 AsyncTask。

我会感谢一些帮助。

谢谢

Answer 1

首先，您需要一个片段来包装您的asynctask，因此如果设备旋转，您不会创建多个请求并泄漏它。您还需要监听器 (GetAccessTokenCallbacks) 来通知您的活动您已完成并返回结果。

public class GetAccessTokenFragment extends Fragment {


OAuth2Config mOauthDetails;

static interface GetAccessTokenCallbacks {
  void onPostExecute(Token token);
}

private GetAccessTokenCallbacks mCallbacks;
private AccessTokenTask mTask;


@Override
public void onAttach(Activity activity) {
  super.onAttach(activity);
  mCallbacks = (GetAccessTokenCallbacks) activity;
}


@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setRetainInstance(true);
  // you must do it as follow
  // first create new instance
  // mOauthDetails = new OAuth2Config(....)
  // then use the values of MainActivity.this.mOauthDetails to initialize it


  mTask = new AccessTokenTask();
  mTask.execute();

}

@Override
public void onDetach() {
  super.onDetach();
  mCallbacks = null;
}



private class AccessTokenTask extends AsyncTask<Void, Void, Token> {

  @Override
  protected Token doInBackground(Void... param) {

    Token token = TheClassOfThisFunction.getAccessToken(mOauthDetails);
    return token;
  }

  @Override
  protected void onPostExecute(Token token) {
    if (mCallbacks != null) {
      mCallbacks.onPostExecute(token[0]);
    }
  }
 }
}

在您的MainActivity 中，您必须实现GetAccessTokenFragment.GetAccessTokenCallbacks 并创建GetAccessTokenFragment。

public class MainActivity extends FragmentActivity implements GetAccessTokenFragment.GetAccessTokenCallbacks {

      public OAuth2Config mOauthDetails;

      private static final String TAG_GetAccessTokenFragment = "GetAccessToken";

      private GetAccessTokenFragment mGetAccessTokenFragment;

      @Override
      protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // Initialize mOauthDetails here


        FragmentManager fm = getSupportFragmentManager();
        mGetAccessTokenFragment = (GetAccessTokenFragment) fm.findFragmentByTag(TAG_GetAccessTokenFragment);

        if (mGetAccessTokenFragment == null) {
          mGetAccessTokenFragment = new GetAccessTokenFragment();
          fm.beginTransaction().add(mGetAccessTokenFragment, TAG_GetAccessTokenFragment).commit();
        }

      }

      @Override
      public void onPostExecute(Token token) {
          //you got your token here
      }
    }

好像在下面调用了OAuthConfig：

public class OAuth2Client {
private final String username;
private final String password;
private final String clientId;
private final String clientSecret;
private final String site;
public OAuth2Client(String username, String password, String clientId, String clientSecret, String site) {
    this.username = username;
    this.password = password;
    this.clientId = clientId;
    this.clientSecret = clientSecret;
    this.site = site;
}
public String getUsername() {
    return username;
}
public String getPassword() {
    return password;
}
public String getClientId() {
    return clientId;
}
public String getClientSecret() {
    return clientSecret;
}
public String getSite() {
    return site;
}
public Token getAccessToken() {
    OAuth2Config oauthConfig = new OAuth2Config.OAuth2ConfigBuilder(username, password, clientId, clientSecret, site)
            .grantType("password").build();
    return OAuthUtils.getAccessToken(oauthConfig);
}

}