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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?
終於找到了答案,請參閱下面的答案
我目前正在開始wifi掃描
wifiReceiver = new WifiReceiver();
registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifiManager.startScan();
並在我的廣播接收器中連接到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);
我實際上想執行此操作,然后檢查我是否已真正連接,如果沒有,請再試一次。 現在,我只是do{
}while(!success)
,但無論連接是否實際起作用,似乎成功始終是正確的。
最后,我如何詢問或廣播有關wifi連接是否有效的信息?
編輯:
找到ConnectivityManager.NetworkCallback
並想在這里使用它,我只需要正確地了解一下:
最后,我想知道我當前命令的連接是否失敗,所以我可以繼續。 所以我實際上需要一種onConnectionFailed()。 如果了解給定的回調,也許我仍然可以構建它。
通常,當通過OS手動連接到網絡時,您會獲得有關“正在連接...”和“身份驗證失敗”的狀態更新。 實際上,這正是我所需要的“失敗”消息。 在這些回調上,我基本上得到了onAvailable(),onLost()和onLosing()...如何使用那里獲得“身份驗證失敗”消息?
編輯2:
經過一個小時的反復討論,我實際上找到了一個可能的解決方案,我將嘗試利用該解決方案,然后報告:
編輯3:嘗試了該解決方案,似乎是正確的,但由於某些原因無法正常工作。 我仍然對這種聯系的東西還不夠了解,無法說明原因。 我沒有主意,所以這里是我的代碼和LogCat; WLAN-R44是我的,我將其更改為密碼錯誤,因此希望我的手機連接到我的鄰居的“ Fritzbox ... bla ...” Wifi,這是我的手機所知道的,但從未出現過在這里試用:
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();
}
}
}
連接方式:
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
我想檢查您是否有WiFi的最簡單方法是從互聯網上實際檢索一個頁面,例如Google的主頁。 我通常在應用程序中執行此操作以測試是否有連接。
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);
}
}
然后可以在代碼中的某處這樣調用它:
new TestConnectionTask("http://www.google.com").execute();
因此,在嘗試了許多失敗的事情之后,我終於找到了答案:
為了按預期停止服務,我的onReceive現在幾乎只這樣做:
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();
}
}
現在,我的Smart Wifi Widget實際上運行良好,並且有人為我支付了一個開發人員帳戶的費用,它在Play商店是免費的,因為我沒有這么做,因為應該有這樣的東西。
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