In the start up flow, ask the user if he wants to enable Google Drive sync.

MyTracks/src/com/google/android/apps/mytracks/AbstractSendToGoogleActivity.java

@@ -32,6 +32,7 @@ import com.google.android.apps.mytracks.io.sendtogoogle.SendRequest;
 import com.google.android.apps.mytracks.io.sendtogoogle.SendToGoogleUtils;
 import com.google.android.apps.mytracks.io.sendtogoogle.UploadResultActivity;
 import com.google.android.apps.mytracks.io.spreadsheets.SendSpreadsheetsActivity;
+import com.google.android.apps.mytracks.io.sync.SyncUtils;
 import com.google.android.apps.mytracks.util.IntentUtils;
 import com.google.android.apps.mytracks.util.PreferencesUtils;
 import com.google.android.maps.mytracks.R;
@@ -43,6 +44,7 @@ import android.accounts.AccountManagerFuture;
 import android.accounts.AuthenticatorException;
 import android.accounts.OperationCanceledException;
 import android.app.Activity;
+import android.content.ContentResolver;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
@@ -287,7 +289,19 @@ public abstract class AbstractSendToGoogleActivity extends AbstractMyTracksActiv
   private void startNextActivity() {
     Class<?> next;
     if (sendRequest.isSendDrive()) {
-      if (sendRequest.isDriveShare()) {
+      if (sendRequest.isDriveEnableSync()) {
+        PreferencesUtils.setBoolean(this, R.string.drive_sync_key, true);
+
+        // Turn off everything
+        SyncUtils.disableSync(this);
+
+        // Turn on sync
+        ContentResolver.setMasterSyncAutomatically(true);
+
+        // Enable sync for account
+        SyncUtils.enableSync(sendRequest.getAccount());     
+        return;
+      } else if (sendRequest.isDriveShare()) {
         AddEmailsDialogFragment.newInstance(sendRequest.getTrackId())
             .show(getSupportFragmentManager(), AddEmailsDialogFragment.ADD_EMAILS_DIALOG_TAG);
         return;

MyTracks/src/com/google/android/apps/mytracks/TrackListActivity.java

@@ -28,6 +28,8 @@ import com.google.android.apps.mytracks.fragments.ConfirmDialogFragment.ConfirmC
 import com.google.android.apps.mytracks.fragments.DeleteAllTrackDialogFragment;
 import com.google.android.apps.mytracks.fragments.DeleteOneTrackDialogFragment;
 import com.google.android.apps.mytracks.fragments.DeleteOneTrackDialogFragment.DeleteOneTrackCaller;
+import com.google.android.apps.mytracks.fragments.EnableSyncDialogFragment;
+import com.google.android.apps.mytracks.fragments.EnableSyncDialogFragment.EnableSyncCaller;
 import com.google.android.apps.mytracks.fragments.EulaDialogFragment;
 import com.google.android.apps.mytracks.fragments.EulaDialogFragment.EulaCaller;
 import com.google.android.apps.mytracks.fragments.WelcomeDialogFragment;
@@ -93,7 +95,7 @@ import java.util.Locale;
  * @author Leif Hendrik Wilden
  */
 public class TrackListActivity extends AbstractSendToGoogleActivity
-    implements EulaCaller, WelcomeCaller, ConfirmCaller, DeleteOneTrackCaller {
+    implements EulaCaller, WelcomeCaller, EnableSyncCaller, ConfirmCaller, DeleteOneTrackCaller {
 
   private static final String TAG = TrackListActivity.class.getSimpleName();
   private static final String START_GPS_KEY = "start_gps_key";
@@ -720,8 +722,32 @@ public class TrackListActivity extends AbstractSendToGoogleActivity
           });
       if (dialog != null) {
         dialog.show();
+        return;
       }
     }
+    showEnableSync();
+  }
+
+  private void showEnableSync() {
+    if (EulaUtils.getShowEnableSync(this)) {
+      Fragment fragment = getSupportFragmentManager()
+          .findFragmentByTag(EnableSyncDialogFragment.ENABLE_SYNC_DIALOG_TAG);
+      if (fragment == null) {
+        new EnableSyncDialogFragment().show(
+            getSupportFragmentManager(), EnableSyncDialogFragment.ENABLE_SYNC_DIALOG_TAG);
+      }
+    }
+  }
+
+  @Override
+  public void onEnableSyncDone(boolean enable) {
+    EulaUtils.setShowEnableSync(this);
+    if (enable) {
+      SendRequest sendRequest = new SendRequest(-1L);
+      sendRequest.setSendDrive(true);
+      sendRequest.setDriveEnableSync(true);
+      sendToGoogle(sendRequest);
+    }
   }
 
   /**

MyTracks/src/com/google/android/apps/mytracks/fragments/EnableSyncDialogFragment.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 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.android.apps.mytracks.fragments;
+
+import com.google.android.maps.mytracks.R;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.app.FragmentActivity;
+
+/**
+ * A DialogFrament to enable sync.
+ * 
+ * @author Jimmy Shih
+ */
+public class EnableSyncDialogFragment extends DialogFragment {
+
+  /**
+   * Interface for caller of this dialog fragment.
+   * 
+   * @author Jimmy Shih
+   */
+  public interface EnableSyncCaller {
+
+    /**
+     * Called when enable sync is done.
+     */
+    public void onEnableSyncDone(boolean enable);
+  }
+
+  public static final String ENABLE_SYNC_DIALOG_TAG = "enableSyncDialog";
+
+  private EnableSyncCaller caller;
+  private FragmentActivity fragmentActivity;
+
+  @Override
+  public void onAttach(Activity activity) {
+    super.onAttach(activity);
+    try {
+      caller = (EnableSyncCaller) activity;
+    } catch (ClassCastException e) {
+      throw new ClassCastException(
+          activity.toString() + " must implement " + EnableSyncCaller.class.getSimpleName());
+    }
+  }
+
+  @Override
+  public Dialog onCreateDialog(Bundle savedInstanceState) {
+    fragmentActivity = getActivity();
+    return new AlertDialog.Builder(fragmentActivity).setNegativeButton(
+        R.string.generic_cancel, new OnClickListener() {
+            @Override
+          public void onClick(DialogInterface dialog, int which) {
+            caller.onEnableSyncDone(false);
+          }
+        }).setPositiveButton(R.string.generic_ok, new OnClickListener() {
+        @Override
+      public void onClick(DialogInterface dialog, int which) {
+        caller.onEnableSyncDone(true);
+      }
+    }).setTitle(R.string.enable_sync_title).setMessage(R.string.enable_sync_message).create();
+  }
+
+  @Override
+  public void onCancel(DialogInterface arg0) {
+    caller.onEnableSyncDone(false);
+  }
+}

MyTracks/src/com/google/android/apps/mytracks/io/sendtogoogle/SendRequest.java

@@ -36,6 +36,7 @@ public class SendRequest implements Parcelable {
   private boolean sendFusionTables = false;
   private boolean sendSpreadsheets = false;
 
+  private boolean driveEnableSync = false;
   private boolean driveShare = false;
   private String driveShareEmails = null;
 
@@ -97,6 +98,14 @@ public class SendRequest implements Parcelable {
     this.sendSpreadsheets = sendSpreadsheets;
   }
 
+  public boolean isDriveEnableSync() {
+    return driveEnableSync;
+  }
+
+  public void setDriveEnableSync(boolean driveEnableSync) {
+    this.driveEnableSync = driveEnableSync;
+  }
+
   public boolean isDriveShare() {
     return driveShare;
   }
@@ -199,6 +208,7 @@ public class SendRequest implements Parcelable {
     sendMaps = in.readByte() == 1;
     sendFusionTables = in.readByte() == 1;
     sendSpreadsheets = in.readByte() == 1;
+    driveEnableSync = in.readByte() == 1;
     driveShare = in.readByte() == 1;
     driveShareEmails = in.readString();
     mapsShare = in.readByte() == 1;
@@ -225,6 +235,7 @@ public class SendRequest implements Parcelable {
     out.writeByte((byte) (sendMaps ? 1 : 0));
     out.writeByte((byte) (sendFusionTables ? 1 : 0));
     out.writeByte((byte) (sendSpreadsheets ? 1 : 0));
+    out.writeByte((byte) (driveEnableSync ? 1 : 0));    
     out.writeByte((byte) (driveShare ? 1 : 0));
     out.writeString(driveShareEmails);
     out.writeByte((byte) (mapsShare ? 1 : 0));

MyTracks/src/com/google/android/apps/mytracks/util/EulaUtils.java

@@ -31,6 +31,7 @@ public class EulaUtils {
   // Accepting Google mobile terms of service
   private static final String ACCEPT_EULA_PREFERENCE_KEY = "eula.google_mobile_tos_accepted";
   private static final String SHOW_WELCOME_PREFERENCE_KEY = "showWelcome";
+  private static final String SHOW_ENABLE_SYNC_PREFERENCE_KEY = "showEnableSync";
   
   private EulaUtils() {}
 
@@ -49,7 +50,15 @@ public class EulaUtils {
   public static void setShowWelcome(Context context) {
     setValue(context, SHOW_WELCOME_PREFERENCE_KEY, false);
   }
- 
+
+  public static boolean getShowEnableSync(Context context) {
+    return getValue(context, SHOW_ENABLE_SYNC_PREFERENCE_KEY, true);
+  }
+
+  public static void setShowEnableSync(Context context) {
+    setValue(context, SHOW_ENABLE_SYNC_PREFERENCE_KEY, false);
+  }
+  
   private static boolean getValue(Context context, String key, boolean defaultValue) {
     SharedPreferences sharedPreferences = context.getSharedPreferences(
         EULA_PREFERENCE_FILE, Context.MODE_PRIVATE);