SDK path: frameworks/base/core/java/android/bluetooth/
Service path: packages/apps/Bluetooth/src/com/android/bluetooth/
This class cannot be found when using the protocol class, because the Client part or related interfaces of the Bluetooth protocol in the Android source code are hidden by @hide, so android.jar cannot meet the needs of Android source code framework layer developers. Reflection mechanism or reference framework.jar instead of android.jar.
位置：out\target\common\obj\JAVA_LIBRARIES\framework_intermediates\classes.jar
1. SDK interface
BluetoothMapClient.java: The proxy class of the MAP protocol in the Bluetooth apk, and the application accesses the method of the MAP protocol through this proxy class.
| interface name | describe |
|---|---|
| connect | Connect to specified device |
| disconnect | Disconnect the designated device |
| isConnected | Determine whether the specified device is connected, and return true if connected, otherwise false |
| getConnectedDevices | Get a list of connected devices |
| getDevicesMatchingConnectionStates | Get a list of devices in a specified state |
| getConnectionState | Get the status of the specified device |
| setPriority |