蓝色商务网站模板,抄袭网站违法,华为云企业邮箱,做导航网站成本接(一百五十五)Android P wifi 扫描失败结果上报流程梳理-扫描上报梳理 扫描失败上报梳理发现梳理的差了很多#xff0c;特补充1.WificondScannerImplOverridepublic boolean startSingleScan(WifiNative.ScanSettings settings,WifiNative.ScanEventHandler eventHandler) {i…接(一百五十五)Android P wifi 扫描失败结果上报流程梳理-扫描上报梳理 扫描失败上报梳理发现梳理的差了很多特补充1.WificondScannerImplOverridepublic boolean startSingleScan(WifiNative.ScanSettings settings,WifiNative.ScanEventHandler eventHandler) {if (eventHandler null || settings null) {Log.w(TAG, Invalid arguments for startSingleScan: settings settings ,eventHandler eventHandler);return false;}synchronized (mSettingsLock) {if (mLastScanSettings ! null) {Log.w(TAG, A single scan is already running);return false;}ChannelCollection allFreqs mChannelHelper.createChannelCollection();boolean reportFullResults false;for (int i 0; i settings.num_buckets; i) {WifiNative.BucketSettings bucketSettings settings.buckets[i];if ((bucketSettings.report_events WifiScanner.REPORT_EVENT_FULL_SCAN_RESULT) ! 0) {reportFullResults true;}allFreqs.addChannels(bucketSettings);}Set hiddenNetworkSSIDSet new HashSet();if (settings.hiddenNetworks ! null) {int numHiddenNetworks Math.min(settings.hiddenNetworks.length, MAX_HIDDEN_NETWORK_IDS_PER_SCAN);for (int i 0; i numHiddenNetworks; i) {hiddenNetworkSSIDSet.add(settings.hiddenNetworks[i].ssid);}}mLastScanSettings new LastScanSettings(mClock.getElapsedSinceBootMillis(),reportFullResults, allFreqs, eventHandler);boolean success false;Set freqs;if (!allFreqs.isEmpty()) {freqs allFreqs.getScanFreqs();success mWifiNative.scan(mIfaceName, settings.scanType, freqs, hiddenNetworkSSIDSet);if (!success) {Log.e(TAG, Failed to start scan, freqs freqs);}} else {// There is a scan request but no available channels could be scanned for.// We regard it as a scan failure in this case.Log.e(TAG, Failed to start scan because there is no available channel to scan);}if (success) {if (DBG) {Log.d(TAG, Starting wifi scan for freqs freqs);}mScanTimeoutListener new AlarmManager.OnAlarmListener() {Override public void onAlarm() {handleScanTimeout();}};mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,mClock.getElapsedSinceBootMillis() SCAN_TIMEOUT_MS,TIMEOUT_ALARM_TAG, mScanTimeoutListener, mEventHandler);} else {// indicate scan failure asyncmEventHandler.post(new Runnable() {Override public void run() {reportScanFailure();}});}return true;}}1.1 命令下发成功后的失败下发扫描命令成功后会设立一个15s的倒计时若15s没有失败或者成功上报就会上报一个失败最终触发广播通知/*** Duration to wait before timing out a scan.** The expected behavior is that the hardware will return a failed scan if it does not* complete, but timeout just in case it does not.*/private static final long SCAN_TIMEOUT_MS 15000;private void handleScanTimeout() {synchronized (mSettingsLock) {Log.e(TAG, Timed out waiting for scan result from wificond);reportScanFailure();mScanTimeoutListener null;}}Overridepublic boolean handleMessage(Message msg) {switch(msg.what) {case WifiMonitor.SCAN_FAILED_EVENT:Log.w(TAG, Scan failed);cancelScanTimeout();reportScanFailure();break;case WifiMonitor.PNO_SCAN_RESULTS_EVENT:pollLatestScanDataForPno();break;case WifiMonitor.SCAN_RESULTS_EVENT:cancelScanTimeout();pollLatestScanData();break;default:// ignore unknown event}return true;}另外扫描结果获取失败也会回调上来告诉上层获取扫描结果失败与扫描结果成功对应的有个失败的回调scanner_impl.javavoid ScannerImpl::OnScanResultsReady(uint32_t interface_index, bool aborted,vector ssids,vector frequencies) {if (!scan_started_) {LOG(INFO) Received external scan result notification from kernel.;}scan_started_ false;if (scan_event_handler_ ! nullptr) {// TODO: Pass other parameters back once we find framework needs them.if (aborted) {LOG(WARNING) Scan aborted;scan_event_handler_-OnScanFailed();} else {scan_event_handler_-OnScanResultReady();}} else {LOG(WARNING) No scan event handler found.;}}http://androidxref.com/9.0.0_r3/xref/frameworks/opt/net/wifi/service/java/com/android/server/wifi/WificondControl.java#9783 private class ScanEventHandler extends IScanEvent.Stub {84 private String mIfaceName;8586 ScanEventHandler(NonNull String ifaceName) {87 mIfaceName ifaceName;88 }8990 Override91 public void OnScanResultReady() {92 Log.d(TAG, Scan result ready event);93 mWifiMonitor.broadcastScanResultEvent(mIfaceName);94 }9596 Override97 public void OnScanFailed() {98 Log.d(TAG, Scan failed event);99 mWifiMonitor.broadcastScanFailedEvent(mIfaceName);100 }101 }http://androidxref.com/9.0.0_r3/xref/frameworks/opt/net/wifi/service/java/com/android/server/wifi/scanner/WificondScannerImpl.java#268265 Override266 public boolean handleMessage(Message msg) {267 switch(msg.what) {268 case WifiMonitor.SCAN_FAILED_EVENT:269 Log.w(TAG, Scan failed);270 cancelScanTimeout();271 reportScanFailure();272 break;1.2 命令下发的失败可以看到这个扫描命令流程下发一直会有个执行成功or失败的返回值这会告诉上层执行命令的成功与否。2.总结扫描失败分扫描命令下发失败扫描过程中失败扫描结果获取超时扫描命令下发成功其实就是打个log后续失败一直会上报给上层上层会以广播的形式告知命令下发后kernel去扫描扫描到结果后会告诉上层来取上层这时会再下发命令将扫描结果取上来而不是之前想的kernel扫描到结果后就直接将结果报上来上层直接就用了上层并没有用回调上来的结果而是自己知道结果好了又向kernel要了下结果。这段逻辑在http://androidxref.com/9.0.0_r3/xref/frameworks/opt/net/wifi/service/java/com/android/server/wifi/scanner/WificondScannerImpl.java#276http://androidxref.com/9.0.0_r3/xref/system/connectivity/wificond/scanning/scan_utils.cpp#77
