Android BLE蓝牙扫描系统源码解析学习笔记

以下是用于记录本人学习中的分析Android BLE蓝牙扫描系统源码分析笔记：

我们从BluetoothLeScanner中的startScan开始分析

1，public void startScan(final ScanCallback callback) {
        startScan(null, new ScanSettings.Builder().build(), callback);
    }

2，private int startScan(List<ScanFilter> filters, ScanSettings settings,
            final WorkSource workSource, final ScanCallback callback,
            final PendingIntent callbackIntent,
            List<List<ResultStorageDescriptor>> resultStorages) {
        BluetoothLeUtils.checkAdapterStateOn(mBluetoothAdapter);
        if (callback == null && callbackIntent == null) {
            throw new IllegalArgumentException("callback is null");
        }
        if (settings == null) {
            throw new IllegalArgumentException("settings is null");
        }
        synchronized (mLeScanClients) {
        //这里是为了确保扫描回调和扫描操作是一一对应关系
            if (callback != null && mLeScanClients.containsKey(callback)) {
                return postCallbackErrorOrReturn(callback,
                            ScanC