源码分析
蓝牙连接状态定义位于
packages/modules/Bluetooth/framework/java/android/bluetooth/BluetoothProfile.java
共有四个状态如下
/** The profile is in disconnected state */
int STATE_DISCONNECTED = 0;
/** The profile is in connecting state */
int STATE_CONNECTING = 1;
/** The profile is in connected state */
int STATE_CONNECTED = 2;
/** The profile is in disconnecting state */
int STATE_DISCONNECTING = 3;状态变更回调源码
packages/services/Telecomm/src/com/android/server/telecom/bluetooth/BluetoothStateReceiver.java
当主板主动连接蓝牙设备时会，经历状态1 2 的过程
当主板主动断开蓝牙设备时，会经历状态3 0 的过程
如果是蓝牙设备主动断开，则直接从2变为0，不会经过状态3
日志分析
以下就是蓝牙设备主动断开，抓状态日志
$ logcat | grep "changed state"
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 1: BSR.oR@ACM
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 2: BSR.oR@ACU
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 0: BSR.oR@ADc如果是主板端主动断开，抓日志如下
$ logcat | grep "changed state"
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 1: BSR.oR@ACM
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 2: BSR.oR@ACU
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 3: BSR.oR@ACE
Telecom : BluetoothStateReceiver: Device 70:56:BA:0B:E0:AA changed state to 0: BSR.oR@ADc
