[移动开发]android 9 让蓝牙开启 即可被发现

默认打开蓝牙开关 蓝牙是不可以被其他设备发现的

只能在蓝牙界面才可以被发现

如果想打开开关就被发现

需修改代码

btservice/AdapterProperties.java

?void onBluetoothReady() {
? ? ? ? debugLog("onBluetoothReady, state=" + BluetoothAdapter.nameForState(getState())
? ? ? ? ? ? ? ? + ", ScanMode=" + mScanMode);

? ? ? ? synchronized (mObject) {
? ? ? ? ? ? // Reset adapter and profile connection states
? ? ? ? ? ? setConnectionState(BluetoothAdapter.STATE_DISCONNECTED);
? ? ? ? ? ? mProfileConnectionState.clear();
? ? ? ? ? ? mProfilesConnected = 0;
? ? ? ? ? ? mProfilesConnecting = 0;
? ? ? ? ? ? mProfilesDisconnecting = 0;
? ? ? ? ? ? // adapterPropertyChangedCallback has already been received. ?Set the scan mode.
? ? ? ? ? ? //setScanMode(AbstractionLayer.BT_SCAN_MODE_CONNECTABLE);

? ? ? ? ? ? //可以连接 不能被发现
?? ??? ??? ?setScanMode(AbstractionLayer.BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);

? ? ? ? ? ? //可以连接 也可以被发现
?? ??? ??? ?
? ? ? ? ? ? // This keeps NV up-to date on first-boot after flash.
? ? ? ? ? ? setDiscoverableTimeout(mDiscoverableTimeout);
? ? ? ? }
? ? }