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java - cellIdentityLte.getBands() 总是返回带的空数组

如何获得正确的频带和带宽值？，我按照官方文档使用下面的代码。

参考：getBands() - https://developer.android.com/reference/android/telephony/CellIdentityLte#getBands() 参考：getBandwidth() - https://developer.android.com/reference/android/telephony/CellIdentityLte #getBandwidth()

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