Gears Android WIFI/基站定位源代码分析

核心提示：filter.addAction(mWifiManager.SCAN_RESULTS_AVAILABLE_ACTION);mContext.registerReceiver(this, filter, null, handler);当收到WIFI扫描结果后，调用Native函数onUpdateAvailable，Gea

filter.addAction(mWifiManager.SCAN_RESULTS_AVAILABLE_ACTION);

mContext.registerReceiver(this, filter, null, handler);

当收到WIFI扫描结果后，调用Native函数onUpdateAvailable，并把WIFI的扫描结果传递过去。

public void onReceive(Context context, Intent intent) {

if (intent.getAction().equals(

mWifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {

if (Config.LOGV) {

Log.v(TAG, "Wifi scan resulst available");

}

onUpdateAvailable(mWifiManager.getScanResults(), mNativeObject);

}

}

4.Native函数onUpdateAvailable是在wifi_data_provider_android.cc里实现的。

JNINativeMethod AndroidWifiDataProvider::native_methods_[] = {

{"onUpdateAvailable",

"(Ljava/util/List;J)V",

reinterpret_cast(AndroidWifiDataProvider::OnUpdateAvailable)

},

};

void AndroidWifiDataProvider::OnUpdateAvailable(JNIEnv* ,

jclass ,

jobject wifi_data,

jlong self) {

assert(self);

AndroidWifiDataProvider *self_ptr =

reinterpret_cast(self);

WifiData new_wifi_data;

if (wifi_data) {

InitFromJava(wifi_data, &new_wifi_data);

}

// We notify regardless of whether new_wifi_data is empty

// or not. The arbitrator will decide what to do with an empty

// WifiData object.

self_ptr->NewWifiDataAvailable(&new_wifi_data);

}

void AndroidWifiDataProvider::NewWifiDataAvailable(WifiData* new_wifi_data) {

assert(supported_);

assert(new_wifi_data);

bool is_update_available = false;

data_mutex_.Lock();

is_update_available = wifi_data_.DiffersSignificantly(*new_wifi_data);

wifi_data_ = *new_wifi_data;