目录1、SystemServer2、BluetoothService3、BluetoothManagerService 首先我们要知道，主要系统服务都是在 SystemServer 启动的，蓝牙也是如此：
How can i check the read/ write permission of the file storing media? ie assume i have to write some file inside a directory and that directory may be av开发者_开发知识库ailable on read only media lik
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