关于1.)据此 Google I/O对话当您使用PendingIntents时，即使在后台运行，Location API仍应唤醒您的应用程序，尽管根据我的经验，地理围栏事件非常不可靠，但这可能与GPS不良有关我用于测试的设备中的接收器.

About 1.) According to this Google I/O Talk When you're using PendingIntents the Location API should wake up your app even if it's runnning in the background, although from my experience the Geofencing events are quite unreliable, but this might be related to a bad GPS receiver in the device I used for testing.