CloudEndpointUtils.java

/*
 * Copyright (c) 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.cloud.backend.android;

import android.app.Activity;
import android.util.Log;
import android.widget.Toast;

import com.google.api.client.googleapis.json.GoogleJsonError;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.googleapis.services.AbstractGoogleClient;
import com.google.api.client.googleapis.services.AbstractGoogleClientRequest;
import com.google.api.client.googleapis.services.GoogleClientRequestInitializer;

import java.io.IOException;

/**
 * Common utilities.
 */
public class CloudEndpointUtils {

  public static final boolean LOCAL_ANDROID_RUN = false;
  private static final String LOCAL_APP_ENGINE_SERVER_URL = "http://10.0.2.2:8888";

  /**
   * Updates the Google client builder to connect the appropriate server based
   * on whether LOCAL_ANDROID_RUN is true or false.
   * 
   * @param builder
   *          Google client builder
   * @return same Google client builder
   */
  public static <B extends AbstractGoogleClient.Builder> B updateBuilder(B builder) {
    if (LOCAL_ANDROID_RUN) {
      builder.setRootUrl(LOCAL_APP_ENGINE_SERVER_URL + "/_ah/api/");
    }

    // only enable GZip when connecting to remote server
    final boolean enableGZip = builder.getRootUrl().startsWith("https:");

    builder.setGoogleClientRequestInitializer(new GoogleClientRequestInitializer() {
      public void initialize(AbstractGoogleClientRequest<?> request) throws IOException {
        if (!enableGZip) {
          request.setDisableGZipContent(true);
        }
      }
    });

    return builder;
  }

  /**
   * Logs the given message and shows an error alert dialog with it.
   * 
   * @param activity
   *          activity
   * @param tag
   *          log tag to use
   * @param message
   *          message to log and show or {@code null} for none
   */
  public static void logAndShow(Activity activity, String tag, String message) {
    Log.e(tag, message);
    showError(activity, message);
  }

  /**
   * Logs the given throwable and shows an error alert dialog with its message.
   * 
   * @param activity
   *          activity
   * @param tag
   *          log tag to use
   * @param t
   *          throwable to log and show
   */
  public static void logAndShow(Activity activity, String tag, Throwable t) {
    Log.e(tag, "Error", t);
    String message = t.getMessage();
    if (t instanceof GoogleJsonResponseException) {
      GoogleJsonError details = ((GoogleJsonResponseException) t).getDetails();
      if (details != null) {
        message = details.getMessage();
      }
    }
    showError(activity, message);
  }

  /**
   * Shows an error alert dialog with the given message.
   * 
   * @param activity
   *          activity
   * @param message
   *          message to show or {@code null} for none
   */
  public static void showError(final Activity activity, String message) {
    final String errorMessage = message == null ? "Error" : "[Error ] " + message;
    activity.runOnUiThread(new Runnable() {
      public void run() {
        Toast.makeText(activity, errorMessage, Toast.LENGTH_LONG).show();
      }
    });
  }
}