A2DP connect flow code

xref:/frameworks/base/core/java/android/bluetooth/BluetoothA2dp.java 通過Binder 通信機制，調用到packages/apps/Bluetooth/src/com.android.bluetooth.a2dp/A2dpService.java下一個內部私有類. 接着調用A2dpServive裏面得connect（）方法 A2d

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