DataBase db = DataBase();
bool result= db.connect();
if (result){
print("It connected");
}else{
print("It doesn't match");
}
class DataBase {
String username = "asd";
int password = 1234;
bool connect() {
if (username == "asd" && password == 1234) {
return true;
} else
return false;
}
}
I'm trying to learn dart language. I'm having a problem with using " If " in here. I wanna use " If " for result but it says "if' can't be used as an identifier because it's a keyword.
Try renaming this to be an identifier that isn't a keyword.".
it's because you use it outside the main method, try to put it into main like this:
void main() {
DataBase db = DataBase();
bool result= db.connect();
if (result) {
print("It connected");
} else {
print("It doesn't match");
}
}
You should use a main function:
Related
Dart Language:
This is plugin issue
xmpp_stone plugin
I can't fix this issue
anyone known please replay
[![enter image description here]
https://i.stack.imgur.com/FHe0O.png
Dart Language:
This is plugin issue
xmpp_stone plugin
I can't fix this issue
anyone known please replay
[![enter image description here]
https://i.stack.imgur.com/FHe0O.png
This is full code issue in xmpp_stone plugin
import 'dart:io';
import 'package:xmpp_stone/src/logger/Log.dart';
import 'package:console/console.dart';
import 'dart:async';
import 'dart:convert';
import 'package:xmpp_stone/xmpp_stone.dart' as xmpp;
import 'package:image/image.dart' as image;
final String TAG = 'example';
class ExampleConnectionStateChangedListener implements xmpp.ConnectionStateChangedListener {
late xmpp.Connection _connection;
late xmpp.MessagesListener _messagesListener;
StreamSubscription<String>? subscription;
ExampleConnectionStateChangedListener(xmpp.Connection connection, xmpp.MessagesListener messagesListener) {
_connection = connection;
_messagesListener = messagesListener;
_connection.connectionStateStream.listen(onConnectionStateChanged);
}
#override
void onConnectionStateChanged(xmpp.XmppConnectionState state) {
if (state == xmpp.XmppConnectionState.Ready) {
Log.d(TAG, 'Connected');
_connection.getMamModule().queryAll();
var vCardManager = xmpp.VCardManager(_connection);
vCardManager.getSelfVCard().then((vCard) {
if (vCard != null) {
Log.d(TAG, 'Your info' + vCard.buildXmlString());
}
});
var messageHandler = xmpp.MessageHandler.getInstance(_connection);
var rosterManager = xmpp.RosterManager.getInstance(_connection);
messageHandler.messagesStream.listen(_messagesListener.onNewMessage);
sleep(const Duration(seconds: 1));
var receiver = 'yyy#gmail.com';
var receiverJid = xmpp.Jid.fromFullJid(receiver);
rosterManager.addRosterItem(xmpp.Buddy(receiverJid)).then((result) {
if (result.description != null) {
print("TAG, 'add roster'" + result.description!);
}
});
sleep(const Duration(seconds: 1));
vCardManager.getVCardFor(receiverJid).then((vCard) {
if (vCard != null) {
print("TAG, 'Receiver info'" + vCard.buildXmlString());
if (vCard != null && vCard.image != null) {
var file = File('test456789.jpg')..writeAsBytesSync(image.encodeJpg(vCard.image!));
print("TAG, IMAGE SAVED TO: ${file.path}");
}
}
});
var presenceManager = xmpp.PresenceManager.getInstance(_connection);
presenceManager.presenceStream.listen(onPresence);
}
}
void onPresence(xmpp.PresenceData event) {
Log.d(TAG, 'presence Event from ' + event.jid!.fullJid! + ' PRESENCE: ' + event.showElement.toString());
}
}
Stream<String> getConsoleStream() {
return Console.adapter.byteStream().map((bytes) {
var str = ascii.decode(bytes);
str = str.substring(0, str.length - 1);
return str;
});
}
class ExampleMessagesListener implements xmpp.MessagesListener {
#override
void onNewMessage(xmpp.MessageStanza? message) {
if (message!.body != null) {
Log.d(TAG ,format(
'New Message from {color.blue}${message.fromJid!.userAtDomain}{color.end} message: {color.red}${message.body}{color.end}'));
}
}
#override
void onChatMessage(xmpp.MessageStanza? message) {
print(message);
if (message!.body != null) {
Log.d(TAG,format(
'New Message from {color.blue}${message.fromJid!.userAtDomain}{color.end} message: {color.red}${message.body}{color.end}'));
}
}
}
sendmessageforxmpp(){
var userAtDomain = 'xxx#gmail.com';
var password = 'password';
var jid = xmpp.Jid.fromFullJid(userAtDomain);
var account = xmpp.XmppAccountSettings(userAtDomain, jid.local,
jid.domain, password, 5222, resource: 'xmppstone');
var connection = xmpp.Connection(account);
var receiver = 'yyy#gmail.com';
var receiverJid = xmpp.Jid.fromFullJid(receiver);
Log.d(TAG, receiverJid.fullJid.toString());
var messageHandler =
xmpp.MessageHandler.getInstance(connection);
messageHandler.sendMessage(receiverJid, "str");
}
Your problem is that you are not using xmpp_stone correctly and therefore ends up in a situation where the internal state of xmpp_stone does not match what the developer of the package have intended.
I do, however, think the package are badly designed in such a way that wrong usage are very likely to happen so I would not blame you for getting into trouble.
The problem is the following in your code:
var connection = xmpp.Connection(account);
// ..
var messageHandler = xmpp.MessageHandler.getInstance(connection);
messageHandler.sendMessage(receiverJid, "str");
You are here creating a Connection but the underlying socket are never created. The default value for the internal state of Connection are XmppConnectionState.Idle. But when you are later trying to sendMessage, your code ends up running this from the package:
void write(message) {
Log.xmppp_sending(message);
if (isOpened()) {
_socket!.write(message);
}
}
bool isOpened() {
return state != XmppConnectionState.Closed &&
state != XmppConnectionState.ForcefullyClosed &&
state != XmppConnectionState.Closing &&
state != XmppConnectionState.SocketOpening;
}
The isOpened() ends up returning true since it sees XmppConnectionState.Idle as an open state where messages are allowed to be sent.
But that is not the case here since we never asked Connection to open actually do any connection and therefore _socket ends up being null. Since the package are trying to do ! on null, the application crashes.
For an actual solution, we can get inspired from the example implementation from xmpp_dart:
https://github.com/vukoye/xmpp_dart/blob/master/example/example.dart
We can here see they have a connection.connect(); call. But, I am going to guess this really only works because the example are not going to use the connection right after this call. The problem is that it is implemented like the following:
void connect() {
if (_state == XmppConnectionState.Closing) {
_state = XmppConnectionState.WouldLikeToOpen;
}
if (_state == XmppConnectionState.Closed) {
_state = XmppConnectionState.Idle;
}
if (_state == XmppConnectionState.Idle) {
openSocket();
}
}
Future<void> openSocket() async {
connectionNegotatiorManager.init();
setState(XmppConnectionState.SocketOpening);
try {
return await Socket.connect(account.host ?? account.domain, account.port)
.then((Socket socket) {
// if not closed in meantime
if (_state != XmppConnectionState.Closed) {
setState(XmppConnectionState.SocketOpened);
So connect() returns void but calls openSocket() which does return a Future that would be able to tell us when the connection are actually ready.
I would therefore instead suggest using openSocket() directly and make your sendmessageforxmpp() method async so we can await on the connection being open.
So your code should look like:
Future<void> sendmessageforxmpp() async {
var userAtDomain = 'xxx#gmail.com';
var password = 'password';
var jid = xmpp.Jid.fromFullJid(userAtDomain);
var account = xmpp.XmppAccountSettings(
userAtDomain, jid.local, jid.domain, password, 5222,
resource: 'xmppstone');
var connection = xmpp.Connection(account);
await connection.openSocket(); // <--- the important change :)
var receiver = 'yyy#gmail.com';
var receiverJid = xmpp.Jid.fromFullJid(receiver);
Log.d(TAG, receiverJid.fullJid.toString());
var messageHandler = xmpp.MessageHandler.getInstance(connection);
messageHandler.sendMessage(receiverJid, "str");
}
This error is usually occurring when you use the bang operator (!) on a nullable value that was not properly initialized, like
yourvariable!.somefield
The above assumes that yourvariable will not be null as this point. If it's null, then reality is in conflict with the assumption I have just described.
here is the code can anyone tell how can I setSkuDetails()
as I was using vision one now I update it to 4
However, setSku and setType seem to be deprecated in the BillingFlowParams.Builder class. Instead, we should be using setSkuDetails(SkuDetails).
private void BillingFunction() {
mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
// Establish connection to billing client
mBillingClient = BillingClient.newBuilder(MainActivity.this).setListener(MainActivity.this).build();
mBillingClient.startConnection(new BillingClientStateListener() {
#Override
public void onBillingSetupFinished(#NonNull BillingResult billingResult) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
// The billing client is ready. You can query purchases here.
getPricesMonthlyTime();
getPricesYearlyTime();
getPricesONeTime();
}
}
#Override
public void onBillingServiceDisconnected() {
//TODO implement your own retry policy
Toast.makeText(MainActivity.this, getResources().getString(R.string.billing_connection_failure), Toast.LENGTH_SHORT);
// Try to restart the connection on the next request to
// Google Play by calling the startConnection() method.
}
});
continue_button.setOnClickListener(view -> {
if (select_radio_one.getVisibility() == View.VISIBLE) {
BillingFlowParams flowParams = BillingFlowParams.newBuilder()
.setSkuDetails()
.build();
BillingResult responseCode = mBillingClient.launchBillingFlow(MainActivity.this, flowParams);
brandDialogInAppPurchase.dismiss();
} else if (select_radio_two.getVisibility() == View.VISIBLE) {
BillingFlowParams flowParams = BillingFlowParams.newBuilder()
.setSkuDetails()
.build();
BillingResult responseCode = mBillingClient.launchBillingFlow(MainActivity.this, flowParams);
brandDialogInAppPurchase.dismiss();
} else if (select_radio_three.getVisibility() == View.VISIBLE) {
BillingFlowParams flowParams = BillingFlowParams.newBuilder()
.setSkuDetails()
.build();
BillingResult responseCode = mBillingClient.launchBillingFlow(MainActivity.this, flowParams);
brandDialogInAppPurchase.dismiss();
} else {
Toast.makeText(MainActivity.this, "Nothing selected", Toast.LENGTH_SHORT).show();
}
});
// queryPrefPurchases();
queryPurchases();
}
You should send the object skuDetail.
To do so you need to retrieve it by calling querySkuDetailsAsync().
fun querySkuDetails() {
val skuList = ArrayList<String>()
skuList.add("premium_upgrade")
skuList.add("gas")
val params = SkuDetailsParams.newBuilder()
params.setSkusList(skuList).setType(SkuType.INAPP)
// leverage querySkuDetails Kotlin extension function
val skuDetailsResult = withContext(Dispatchers.IO) {
billingClient.querySkuDetails(params.build())
}
// Process the result.
}
I have created Blackberry Application which is working perfectly fine on wi-fi. But when I turn off wi-fi and use Mobile Network then I am not able to run application. It shows No Internet connection available.
I had written these lines.
if (DeviceInfo.isSimulator())
{
deviceinfo = deviceinfo.concat(";deviceside=true");
}
Here is My Http Connection Class
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import net.rim.device.api.system.DeviceInfo;
import net.rim.device.api.system.RadioInfo;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
public class HttpConn
{
public String jsonresponse (String url)
{
String response = null;
HttpConnection httpConnection = null;
InputStream inStream = null;
int code;
StringBuffer stringBuffer = new StringBuffer();
String deviceinfo=url;
try
{
if (DeviceInfo.isSimulator())
{
deviceinfo = deviceinfo.concat(";deviceside=true");
}
/* else if (WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)
{
deviceinfo = ";interface=wifi";
}*/
else if ( (RadioInfo.getActiveWAFs() & RadioInfo.WAF_WLAN) != 0 && RadioInfo.getSignalLevel( RadioInfo.WAF_WLAN ) != RadioInfo.LEVEL_NO_COVERAGE )
{
deviceinfo = deviceinfo.concat(";interface=wifi");
}
// else if (WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)
// {
// deviceinfo = ";interface=wifi";//
// }
if ( (RadioInfo.getActiveWAFs() & RadioInfo.WAF_WLAN) != 0 && RadioInfo.getSignalLevel( RadioInfo.WAF_WLAN ) != RadioInfo.LEVEL_NO_COVERAGE )
{
deviceinfo = deviceinfo.concat(";interface=wifi");
}
// else if ((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_DIRECT) == CoverageInfo.COVERAGE_DIRECT)
// {
// String carrierUid = getCarrierBIBSUid();
//
// if (carrierUid == null)
// {
// // Has carrier coverage, but not BIBS. So use the carrier's TCP
// // network
//
// deviceinfo = ";deviceside=true";
//
// }
// else
// {
// // otherwise, use the Uid to construct a valid carrier BIBS
// // request
//
// deviceinfo = ";deviceside=false;connectionUID="+carrierUid + ";ConnectionType=mds-public";
//
// }
// }
//
// // Check for an MDS connection instead (BlackBerry Enterprise Server)
// else if ((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_MDS) == CoverageInfo.COVERAGE_MDS)
// {
//
// deviceinfo = ";deviceside=false";
//
// }
//
// // If there is no connection available abort to avoid hassling the user
// // unnecssarily.
// else if (CoverageInfo.getCoverageStatus() == CoverageInfo.COVERAGE_NONE)
// {
// deviceinfo = "none";
//
//
// }
// else
// {
// deviceinfo=";deviceside=true";
// }
//if(CoverageInfo.isCoverageSufficient(CoverageInfo.COVERAGE_DIRECT,RadioInfo.WAF_WLAN,false))
// httpConnection = (HttpConnection) Connector.open(url+";interface=wifi", Connector.READ);
httpConnection = (HttpConnection) Connector.open(deviceinfo, Connector.READ);
httpConnection.setRequestMethod(HttpConnection.GET);
code = httpConnection.getResponseCode();
if(code == HttpConnection.HTTP_OK)
{
inStream=httpConnection.openInputStream();
int c;
while((c=inStream.read())!=-1)
{
stringBuffer.append((char)c);
}
response=stringBuffer.toString();
System.out.println("Response Getting from Server is ================" + response);
}
// Is the carrier network the only way to connect?
// In theory, all bases are covered by now so this shouldn't be reachable.But hey, just in case ...
else
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
Dialog.inform("Connection error");
}
});
}
// return deviceinfo;
}
catch (Exception e)
{
System.out.println("caught exception in jsonResponse method"+e.getMessage());
}
finally
{
// if (outputStream != null)
// {
// outputStream.close();
// }
if (inStream != null)
{
try
{
inStream.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (httpConnection != null )
{
try
{
httpConnection.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return response;
}
// private synchronized static String getCarrierBIBSUid() {
// ServiceRecord[] records = ServiceBook.getSB().getRecords();
// int currentRecord;
//
// for (currentRecord = 0; currentRecord < records.length; currentRecord++) {
// if (records[currentRecord].getCid().toLowerCase().equals("ippp")) {
// if (records[currentRecord].getName().toLowerCase()
// .indexOf("bibs") >= 0) {
// return records[currentRecord].getUid();
// }
// }
// }
//
// return null;
// }
}
Actually solution is found.
java.io.IOException:APN is not specified . what APN i have to set manually to device for Wi-Fi network?
http://m2m.icpdas.com/download/gtm-201_modem/manual/gprs_apn.pdf
http://www.faqspedia.com/list-of-all-indian-mobile-operators-access-point-names
Refer this link.
Actually we have to set APN manually. We get it from the Provider.
I hope someone get solution from my this answer. Thanks a lot for your support.
Hi am trying to run my app on blackberry device using Edge gprs connection but its not rendering the pages.i have tried lot to get the connection,also i tried the various links to solve, one of the simple code i have attached here, kindly guide me to solve this
public static String getConnectionString() {
String value="" ;
if(WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)
{
value=";interface=wifi";
}else{
value=";deviceside=true";
}
return value;
}
Append the connection string to your url. Then try
public static String getConnectionString() {
// This code is based on the connection code developed by Mike Nelson of
// AccelGolf.
// http://blog.accelgolf.com/2009/05/22/blackberry-cross-carrier-and-cross-network-http-connection
String connectionString = null;
// Simulator behavior is controlled by the USE_MDS_IN_SIMULATOR
// variable.
if (DeviceInfo.isSimulator()) {
connectionString = ";deviceSide=true";
}
// Wifi is the preferred transmission method
else if (WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED) {
// System.out.println("Device is connected via Wifi.");
connectionString = ";interface=wifi";
}
// Is the carrier network the only way to connect?
else if ((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_DIRECT) == CoverageInfo.COVERAGE_DIRECT) {
// System.out.println("Carrier coverage.---->>" + CoverageInfo.getCoverageStatus());
String carrierUid = getCarrierBIBSUid();
// DebugScreen.Log(" carrierUid is: " + carrierUid);
if (carrierUid == null) {
// Has carrier coverage, but not BIBS. So use the carrier's TCP
// network
// System.out.println("No Uid");
String wapString = getAvailableConnectionsString();
// DebugScreen.Log("from wap2 connection--->" + wapString);
if(wapString == null){
connectionString = ";deviceside=true";
}else{
connectionString = wapString;
}
} else {
// otherwise, use the Uid to construct a valid carrier BIBS
// request
connectionString = ";deviceside=true;connectionUID=" + carrierUid + ";ConnectionType=mds-public";
}
}
// Check for an MDS connection instead (BlackBerry Enterprise Server)
else if ((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_MDS) == CoverageInfo.COVERAGE_MDS) {
// System.out.println("MDS coverage found");
connectionString = ";deviceside=false";
}
// If there is no connection available abort to avoid bugging the user
// unnecssarily.
else if (CoverageInfo.getCoverageStatus() == CoverageInfo.COVERAGE_NONE) {
// System.out.println("There is no available connection.");
}
// In theory, all bases are covered so this shouldn't be reachable.
else {
// System.out.println("no other options found, assuming device.");
connectionString = ";deviceside=true";
}
return connectionString;
}
Add this method and append connection String to url.
private static String getCarrierBIBSUid() {
ServiceRecord[] records = ServiceBook.getSB().getRecords();
int currentRecord;
for (currentRecord = 0; currentRecord < records.length; currentRecord++) {
// DebugScreen.Log("Util.getCarrierBIBSUid() for ippp--------->>" + records[currentRecord].getCid().toLowerCase());
if (records[currentRecord].getCid().toLowerCase().equals("ippp")) {
// DebugScreen.Log("Util.getCarrierBIBSUid() for bibs..........'''''" + records[currentRecord].getName().toLowerCase().indexOf("bibs") );
if (records[currentRecord].getName().toLowerCase().indexOf("bibs") >= 0) {
return records[currentRecord].getUid();
}
}
}
return null;
}
public static String getAvailableConnectionsString() {
String conns = null;
ServiceBook sb = ServiceBook.getSB();
ServiceRecord[] records = sb.getRecords();
String cid;
String uid;
for (int i = 0; i < records.length; i++) {
ServiceRecord myRecord = records[i];
// System.out.println("record name:"+myRecord.getName()+" cid:"+myRecord.getCid().toLowerCase()+" "+myRecord.getUid().toLowerCase());
if (myRecord.isValid() && !myRecord.isDisabled()) {
cid = myRecord.getCid().toLowerCase();
uid = myRecord.getUid().toLowerCase();
//Wap2.0
if (cid.indexOf("wptcp") != -1 && uid.indexOf("wifi") == -1 && uid.indexOf("mms") == -1 ) {
conns = ";deviceside=true" + ";ConnectionUID="+ myRecord.getUid();
if(myRecord.getUid().equalsIgnoreCase("GTCP BIBS")){
return conns;
}
}
}
}
return conns;
}
This code is work for me..
I have developed an application for blackberry devices. The application is working fine if it uses internet via data service provider.
I have BB 9550 and I want to use my application using wifi. I tried a lot but I cant get proper answer to check wifi condition.
How we can differentiate to run our application for wifi or data service provider?
For checking wifi is connected or not the following method will help you.
public static boolean isWifiConnected()
{
try
{
if (RadioInfo.getSignalLevel(RadioInfo.WAF_WLAN) != RadioInfo.LEVEL_NO_COVERAGE)
{
return true;
}
}
catch(Exception e)
{
System.out.println("Exception during get WiFi status");
}
return false;
}
if wifi is not connected the following methods will help to add data service.
public static String getConnParam(){
String connectionParameters = "";
if (WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED) {
// Connected to a WiFi access point
connectionParameters = ";interface=wifi";
} else {
int coverageStatus = CoverageInfo.getCoverageStatus();
ServiceRecord record = getWAP2ServiceRecord();
if (record != null
&& (coverageStatus & CoverageInfo.COVERAGE_DIRECT) ==
CoverageInfo.COVERAGE_DIRECT) {
// Have network coverage and a WAP 2.0 service book record
connectionParameters = ";deviceside=true;ConnectionUID="
+ record.getUid();
} else if ((coverageStatus & CoverageInfo.COVERAGE_MDS) ==
CoverageInfo.COVERAGE_MDS) {
// Have an MDS service book and network coverage
connectionParameters = ";deviceside=false";
} else if ((coverageStatus & CoverageInfo.COVERAGE_DIRECT) ==
CoverageInfo.COVERAGE_DIRECT) {
// Have network coverage but no WAP 2.0 service book record
connectionParameters = ";deviceside=true";
}
}
return connectionParameters;
}
private static ServiceRecord getWAP2ServiceRecord() {
ServiceBook sb = ServiceBook.getSB();
ServiceRecord[] records = sb.getRecords();
for(int i = 0; i < records.length; i++) {
String cid = records[i].getCid().toLowerCase();
String uid = records[i].getUid().toLowerCase();
if (cid.indexOf("wptcp") != -1 &&
uid.indexOf("wifi") == -1 &&
uid.indexOf("mms") == -1) {
return records[i];
}
}
return null;
}
Example to use above methods.
String connParams=(isWifiConnected())?";interface=wifi":getConnParam();
Hope This will help you
try this:
private static String getParameters() {
if (GetWiFiCoverageStatus()) {
return ";deviceside=true;interface=wifi";
}
else {
return yourParametersForEdge
}
}
private static boolean GetWiFiCoverageStatus() {
if((WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)) {
return true;
}
else
return false;
}
And when you need to connect, you'll have to add the parameters to the URL:
yourUrl = yourUrl + getParameters();