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[英]When downloading data over WiFi, how do I know I am connected using Wifi
[英]How do I know the wifi connection worked?
终于找到了答案,请参阅下面的答案
我目前正在开始wifi扫描
wifiReceiver = new WifiReceiver();
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifiManager.startScan();
并在我的广播接收器中连接到wifi
class WifiReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Log.e("DEBUG", "Wifi scanned");
SmartWifiChange(); //connect to certain wifi if stuff.
unregisterReceiver(this);
stopSelf(); //end of a running service
}
}
SmartWifiChange()部分:
WifiConfiguration wifiToConnect = presentWifis.get(resultToConnect);
success = wifiManager.enableNetwork(wifiToConnect.networkId, true);
if(success)
Toast.makeText(getApplicationContext(), "Now connected to: "
+resultToConnect.SSID,Toast.LENGTH_LONG).show();
else presentWifis.remove(resultToConnect);
我实际上想执行此操作,然后检查我是否已真正连接,如果没有,请再试一次。 现在,我只是do{
}while(!success)
,但无论连接是否实际起作用,似乎成功始终是正确的。
最后,我如何询问或广播有关wifi连接是否有效的信息?
编辑:
找到ConnectivityManager.NetworkCallback
并想在这里使用它,我只需要正确地了解一下:
最后,我想知道我当前命令的连接是否失败,所以我可以继续。 所以我实际上需要一种onConnectionFailed()。 如果了解给定的回调,也许我仍然可以构建它。
通常,当通过OS手动连接到网络时,您会获得有关“正在连接...”和“身份验证失败”的状态更新。 实际上,这正是我所需要的“失败”消息。 在这些回调上,我基本上得到了onAvailable(),onLost()和onLosing()...如何使用那里获得“身份验证失败”消息?
编辑2:
经过一个小时的反复讨论,我实际上找到了一个可能的解决方案,我将尝试利用该解决方案,然后报告:
编辑3:尝试了该解决方案,似乎是正确的,但由于某些原因无法正常工作。 我仍然对这种联系的东西还不够了解,无法说明原因。 我没有主意,所以这里是我的代码和LogCat; WLAN-R44是我的,我将其更改为密码错误,因此希望我的手机连接到我的邻居的“ Fritzbox ... bla ...” Wifi,这是我的手机所知道的,但从未出现过在这里试用:
接收器:
class WifiReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
switch(intent.getAction()) {
case WifiManager.SCAN_RESULTS_AVAILABLE_ACTION:
Log.e("DEBUG", "Wifi scanned");
unregisterReceiver(this);
if(SmartWifiChange(true)){
registerReceiver(this, new IntentFilter(WifiManager
.SUPPLICANT_STATE_CHANGED_ACTION));
}else {
Log.e("Debug", "Off");
stopSelf();
}
break;
case WifiManager.SUPPLICANT_STATE_CHANGED_ACTION:
Log.e("Debug", "State changed action");
Log.e("Debug", "New state: "+intent.getParcelableExtra(WifiManager
.EXTRA_NEW_STATE).toString());
if (intent.getIntExtra(WifiManager.EXTRA_SUPPLICANT_ERROR, -1)==WifiManager.ERROR_AUTHENTICATING)
Log.e("Debug", "Error authenticating");
if (!SmartWifiChange(false)){
unregisterReceiver(this);
Log.e("AfterError", "Off");
stopSelf();
}
else if ((intent.getParcelableExtra(WifiManager
.EXTRA_NEW_STATE))==SupplicantState.COMPLETED){
Log.e("Debug", "Completed");
Toast.makeText(context, "Done", Toast.LENGTH_LONG).show();
unregisterReceiver(this);
Log.e("Completed", "Off");
stopSelf();
}else{
Toast.makeText(context, "Problem", Toast.LENGTH_SHORT).show();
Log.e("Problem", intent.getParcelableExtra(WifiManager
.EXTRA_NEW_STATE).toString());
Log.e("Problem", "Off");
unregisterReceiver(this);
stopSelf();
}
break;
default:
stopSelf();
}
}
}
连接方式:
private boolean SmartWifiChange(boolean success) {
boolean connectToWifi = true;
parseWifis();
//Keine bekannten Wifis vorhanden
if (presentWifis.isEmpty()){
wifiManager.setWifiEnabled(false); //WLAN aus
Toast.makeText(getApplicationContext(), "No known Wifis -> mobile data",
Toast.LENGTH_LONG).show();
setMobileData(true);//Datenverbindung an
connectToWifi=false;
}else{
if(success) {
ScanResult[] keysArray = presentWifis.keySet().toArray(new ScanResult[presentWifis
.keySet().size()]);
resultToConnect = keysArray[0];
for (int i = 1; i < presentWifis.size(); i++) {
if (keysArray[i].level > resultToConnect.level) {
resultToConnect = keysArray[i];
}
}
WifiConfiguration wifiToConnect = presentWifis.get(resultToConnect);
wifiManager.enableNetwork(wifiToConnect.networkId, true);
Toast.makeText(getApplicationContext(), "Now connecting to: " + resultToConnect
.SSID,
Toast.LENGTH_SHORT).show();
Log.e("Debug", resultToConnect.SSID);
}
else {
Log.e("Debug", "Neuer Versuch");
presentWifis.remove(resultToConnect);
connectToWifi=SmartWifiChange(true);
}
if(connectToWifi)
setMobileData(false);
}
return connectToWifi;
}
logcat的:
04-21 15:39:30.025 16243-16243/de.regenhardt.smartwifiwidget E/DEBUG﹕ Service started
04-21 15:39:30.057 16243-16243/de.regenhardt.smartwifiwidget E/TextView﹕ get resource from application failed.
04-21 15:39:32.828 16243-16243/de.regenhardt.smartwifiwidget E/DEBUG﹕ Wifi scanned
04-21 15:39:33.105 16243-16243/de.regenhardt.smartwifiwidget E/TextView﹕ get resource from application failed.
04-21 15:39:33.230 16243-16243/de.regenhardt.smartwifiwidget E/Debug﹕ WLAN-R44
04-21 15:39:33.237 16243-16243/de.regenhardt.smartwifiwidget E/DEBUG﹕ Data: false
04-21 15:39:33.244 16243-16243/de.regenhardt.smartwifiwidget E/Debug﹕ State changed action
04-21 15:39:33.245 16243-16243/de.regenhardt.smartwifiwidget E/Debug﹕ New state: FOUR_WAY_HANDSHAKE
04-21 15:39:33.263 16243-16243/de.regenhardt.smartwifiwidget E/Debug﹕ Neuer Versuch
04-21 15:39:33.280 16243-16243/de.regenhardt.smartwifiwidget E/TextView﹕ get resource from application failed.
04-21 15:39:33.285 16243-16243/de.regenhardt.smartwifiwidget E/Debug﹕ WLAN-R44
04-21 15:39:33.285 16243-16243/de.regenhardt.smartwifiwidget E/DEBUG﹕ Data: false
04-21 15:39:33.286 16243-16243/de.regenhardt.smartwifiwidget E/DEBUG﹕ Data: false
04-21 15:39:33.288 16243-16243/de.regenhardt.smartwifiwidget E/TextView﹕ get resource from application failed.
04-21 15:39:33.291 16243-16243/de.regenhardt.smartwifiwidget E/Problem﹕ FOUR_WAY_HANDSHAKE
04-21 15:39:33.291 16243-16243/de.regenhardt.smartwifiwidget E/Problem﹕ Off
我想检查您是否有WiFi的最简单方法是从互联网上实际检索一个页面,例如Google的主页。 我通常在应用程序中执行此操作以测试是否有连接。
class TestConnectionTask extends AsyncTask<Void, Void, Boolean>
{
private String mUrl;
public TestConnectionTask(String url)
{
this.mUrl = url;
}
@Override
protected Boolean doInBackground(Void... params)
{
try
{
URL urlConnection = new URL(mUrl);
HttpURLConnection connection = (HttpURLConnection) urlConnection
.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
return Boolean.TRUE;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Boolean result)
{
if ( result != null)
{
// Connection was successful
// Do something here
}
super.onPostExecute(result);
}
}
然后可以在代码中的某处这样调用它:
new TestConnectionTask("http://www.google.com").execute();
因此,在尝试了许多失败的事情之后,我终于找到了答案:
为了按预期停止服务,我的onReceive现在几乎只这样做:
public void onReceive(Context context, Intent intent) {
Log.e("DEBUG", "Received");
try {
switch(intent.getAction()) {
case WifiManager.SUPPLICANT_STATE_CHANGED_ACTION:
Log.e("Debug", "State changed action");
Log.e("Debug", "New state: "+intent.getParcelableExtra(WifiManager
.EXTRA_NEW_STATE).toString());
if (intent.getIntExtra(WifiManager.EXTRA_SUPPLICANT_ERROR, -1)==WifiManager.ERROR_AUTHENTICATING) {
Log.e("Debug", "Error authenticating");
if (!SmartWifiChange(false)) { //retry with next available Wifi
unregisterReceiver(this);
Log.e("AfterError", "Off");
stopSelf();
}
}
else if ((intent.getParcelableExtra(WifiManager
.EXTRA_NEW_STATE))==SupplicantState.COMPLETED){
Log.e("Debug", "Completed");
Toast.makeText(context, "Done", Toast.LENGTH_LONG).show();
unregisterReceiver(this);
Log.e("Completed", "Off");
stopSelf();
}
break;
default:
stopSelf();
}
} catch (Exception e) {
e.printStackTrace();
unregisterReceiver(this);
stopSelf();
}
}
现在,我的Smart Wifi Widget实际上运行良好,并且有人为我支付了一个开发人员帐户的费用,它在Play商店是免费的,因为我没有这么做,因为应该有这样的东西。
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