started to add ble functions

added ble as sensor to java and c++
added sensorlistener for ble
added ble to observation and onDataSensor in filter
started to work on ble fingerprints for optimization

sensors/android/BLESensorAndroid.cpp

@@ -0,0 +1,18 @@
+#ifdef ANDROID
+
+#include "BLESensorAndroid.h"
+
+extern "C" {
+
+    /** called after each successful WiFi scan */
+    JNIEXPORT void JNICALL Java_indoor_java_BLE_onScanComplete(JNIEnv* env, jobject jobj, jbyteArray arrayID) {
+        (void) env; (void) jobj;
+        jsize length = env->GetArrayLength(arrayID);
+        jbyte* data = env->GetByteArrayElements(arrayID, 0);
+        std::string str((char*)data, length);
+        env->ReleaseByteArrayElements(arrayID, data, JNI_ABORT);
+        BLESensorAndroid::get().handle(str);
+    }
+}
+
+#endif