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我尝试了关于Android Maps V2快速入门的教程 但是当我运行应用程序时,会显示一个空白的地图屏幕.我的手机使用Android 2.2.1.

这是logcat中显示的内容:

12-07 18:07:52.479: W/dalvikvm(1654): VFY: unable to resolve instance field 24
12-07 18:07:53.129: W/dalvikvm(1654): Unable to resolve superclass of Lmaps/a/du; (411)
12-07 18:07:53.129: W/dalvikvm(1654): Link of class 'Lmaps/a/du;' failed
12-07 18:07:53.139: W/dalvikvm(1654): Unable to resolve superclass of Lmaps/a/ej; (2363)
12-07 18:07:53.139: W/dalvikvm(1654): Link of class 'Lmaps/a/ej;' failed
12-07 18:07:53.139: W/dalvikvm(1654): Unable to resolve superclass of Lmaps/j/k; (2379)
12-07 18:07:53.139: W/dalvikvm(1654): Link of class 'Lmaps/j/k;' failed
12-07 18:07:53.149: E/dalvikvm(1654): Could not find class 'maps.j.k', …

我正在尝试为Android应用程序实施谷歌加登录.我按照谷歌开发者页面" https://developers.google.com/+/mobile/android/getting-started " 上的指南进行操作.我唯一的问题是,当设备上只有一个Google帐户时,帐户选择器对话框不会显示.有没有解决的办法？