我正在为我的研究开发wifi室内定位应用程序。我从https://github.com/Talentica/WifiIndoorPositioning获得附加的wifi扫描服务和广播接收器，以获得wifi扫描结果并使用它来获取室内位置。我的问题是wifi扫描结果不随时间从一个地方移动到另一个地方，它似乎给了私有扫描结果而不是新列表。如何编辑它以获得实际更新的扫描结果
public class WifiService extends Service {
private final String TAG = "WifiService";
WifiConfiguration wifiConfiguration = new WifiConfiguration();
private WifiManager mWifiManager;
private ScheduledFuture<?> scheduleReaderHandle;
private ScheduledExecutorService mScheduler;
private WifiData mWifiData;
private long initialDelay = 0;
private long periodReader = AppContants.FETCH_INTERVAL;
List<ScanResult> mResults;
/**
* It creates a new Thread that it is executed periodically reading the last
* scanning of WiFi networks (if WiFi is available).
*/
@Override
public void onCreate() {
Log.d(TAG, "WifiService onCreate");
mWifiData = new WifiData();
mWifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
mScheduler = Executors.newScheduledThreadPool(1);
scheduleReaderHandle = mScheduler.scheduleAtFixedRate(new ScheduleReader(), initialDelay, periodReader,
TimeUnit.MILLISECONDS);
mResults = new ArrayList<ScanResult>() {};
}
/**
* Kills the periodical Thread before destroying the service
*/
@Override
public void onDestroy() {
// stop read thread
scheduleReaderHandle.cancel(true);
mScheduler.shutdown();
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
/**
* Performs a periodical read of the WiFi scan result, then it creates a new
* {@link WifiData ()} object containing the list of networks and finally it
* sends it to the main activity for being displayed.
*/
class ScheduleReader implements Runnable {
@Override
public void run() {
if (mWifiManager.isWifiEnabled()) {
mResults = mWifiManager.getScanResults();
Log.d(TAG, "New scan result: (" + mResults.size() + ") networks found");
// store networks
mWifiData.addNetworks(mResults);
// send data to UI
Intent intent = new Intent(AppContants.INTENT_FILTER);
intent.putExtra(AppContants.WIFI_DATA, mWifiData);
LocalBroadcastManager.getInstance(WifiService.this).sendBroadcast(intent);
mResults.clear();
}
}
}
}
public class MainActivityReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
NumberFormat formatter = new DecimalFormat("#0.0000");
mWifiData = (WifiData) intent.getParcelableExtra(AppContants.WIFI_DATA);
if (mWifiData.getNetworks().size() != 0) {
List<WifiDataNetwork> latestScanList = mWifiData.getNetworks();
LocationWithNearbyPlaces loc = AlgorithmTxtDb.processingAlgorithms(fingerprintRefPointsList, routersList, latestScanList, 2);
}
}
public class MainActivityReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
NumberFormat formatter = new DecimalFormat("#0.0000");
mWifiData = (WifiData) intent.getParcelableExtra(AppContants.WIFI_DATA);
if (mWifiData.getNetworks().size() != 0) {
List<WifiDataNetwork> latestScanList = mWifiData.getNetworks();
LocationWithNearbyPlaces loc = AlgorithmTxtDb.processingAlgorithms(fingerprintRefPointsList, routersList, latestScanList, 2);
}
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mWifiData = null;
// set receiver
LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver, new IntentFilter(AppContants.INTENT_FILTER));
// launch WiFi service
wifiServiceIntent = new Intent(this, WifiService.class);
startService(wifiServiceIntent);
// recover retained object
mWifiData = (WifiData) getLastNonConfigurationInstance();
}
在您的应用中添加以下依赖项。
implementation 'com.easyconnectlibrary.library:easyconnectlibrary:1.0.5'
使用下面的代码每10秒获得一次wifi扫描结果。但是，您可以根据您的要求将10秒更改为5秒。
private WifiConnection mWifiConnection;
private Handler mHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWifiConnection = WifiConnection.getInstance(this);
mWifiConnection.registerWifiScanListener(new WifiScanListener() {
@Override
public void onWifiScanList(List<ScanResult> scanResultList) {
int i = 1;
if (scanResultList.size() == 0) {
Log.i("MainActivity Result " + i, "No Wifi available");
} else {
for (ScanResult scanResult : scanResultList) {
Log.i("MainActivity Result " + i, scanResult.SSID);
i++;
}
}
}
@Override
public void onLocationServiceOff() {
Log.i("MainActivity", "Location service should be turned on");
}
@Override
public void onError(WIFI_SCAN_ERROR wifi_scan_error) {
Log.i("MainActivity", wifi_scan_error + " Error");
}
});
mHandler = new Handler();
final Runnable runnable = new Runnable() {
@Override
public void run() {
Log.i("MainActivity", "Handler Started");
mWifiConnection.getWifiScanList();
}
};
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
mHandler.post(runnable);
try {
//sleep for 10 second before making another scan request
Thread.sleep(10000);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}).start();
}
问题来自android 9.0最新版本的android（android 9（Pie））对WIFI扫描有新的限制和限制，因为它是由android记录的。它们为前景和后台场景的扫描间隔添加了限制，以节省功耗。 Android 9及更高版本：每个前台应用程序可以在2分钟内扫描四次。这允许在短时间内进行扫描。所有后台应用程序组合可以在30分钟内扫描一次。 android wifi scan以下链接代表这种节流的反应：links represent the response of this throttling，link 2，link 3，link 4