initial version

_android/src/MyActivity.java

@@ -0,0 +1,23 @@
+package our.java.stuff;
+
+import android.os.Bundle;
+import org.qtproject.qt5.android.bindings.QtActivity;
+
+public class MyActivity extends QtActivity {
+
+    public static MyActivity act;
+
+    @Override
+    public void onCreate(Bundle savedState) {
+        MyActivity.act = this;
+        super.onCreate(savedState);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        MyActivity.act = null;
+    }
+
+
+}

_android/src/WiFi.java

@@ -0,0 +1,101 @@
+package java.indoor;
+
+import android.app.Activity;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.wifi.ScanResult;
+import android.net.wifi.WifiManager;
+import android.os.Debug;
+import android.util.Log;
+import java.util.List;
+import java.io.ByteArrayOutputStream;
+
+public class WiFi {
+
+    private static Activity act;
+    private static WifiManager manager;
+    private static BroadcastReceiver receiver;
+
+
+
+    /** called when a scan is completed successfully */
+    public static native void onScanComplete(final byte[] result);
+
+    /**
+     * start WiFi scanning in the background.
+     * will call onScanComplete() once a scan is available
+     */
+    public static int start() {
+
+        Log.d("wifi", "start()");
+
+        MyActivity act = MyActivity.act;
+        manager = (WifiManager) act.getSystemService(Context.WIFI_SERVICE);
+
+        reset();
+
+        WiFi.receiver = new BroadcastReceiver() {
+            public final void onReceive(final Context context, final Intent intent) {
+                final byte[] result = serialize(manager.getScanResults());
+                WiFi.onScanComplete(result);
+                triggerOneScan();
+            }
+        };
+
+        // register scan callback
+        act.registerReceiver(WiFi.receiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
+
+        // start the first scan
+        triggerOneScan();
+
+        return 0;
+
+    }
+
+    /** convert the given scan-result to a binary byte[] representation */
+    private static byte[] serialize(final List<ScanResult> lst) {
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try {
+            for (final ScanResult res : lst) {
+                baos.write(res.BSSID.getBytes());
+                baos.write((byte)res.level);
+                baos.write((byte)0);
+                baos.write((byte)0);
+            }
+        } catch (final Exception e) {;}
+        return baos.toByteArray();
+    }
+
+
+
+    /** reset the WiFi subsystem (better scanning) */
+    private static void reset() {
+        WiFi.manager.disconnect();
+        WiFi.manager.createWifiLock(manager.WIFI_MODE_SCAN_ONLY, "Indoor");
+        //WiFi.manager.setWifiEnabled(false);
+        //WiFi.manager.setWifiEnabled(true);
+        WiFi.manager.disconnect();
+        WiFi.manager.disconnect();
+        WiFi.manager.disconnect();
+        WiFi.manager.disconnect();
+        WiFi.manager.disconnect();
+        WiFi.manager.disconnect();
+    }
+
+    /** try to trigger one scan process */
+    private static void triggerOneScan() {
+
+        Log.d("wifi", "triggerOneScan()");
+
+        try {
+            if(!manager.startScan()) {throw new RuntimeException("Cant start WiFi!");}
+        }catch (final Exception e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+
+
+}