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App Inventor 2 地图与电子围栏教程 - LocationSensor与地图组件 · App Inventor 2 中文网
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Q3: 如何计算两个GPS点之间的距离？
Q4: 电子围栏后台运行？
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概述
App Inventor 2内置了 Map 组件（基于OpenStreetMap），可以实现：
地图显示和交互
地图标记（Marker）...
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