Develop Reference

Update and retrieve chat history in smack with openfire -Android

I am making a chat application with smack library and openfire as a server but everytime i exit the chat conversation activity between two users and come back, the whole chat gets erased. I have already enabled archive settings to store one to one messages in the server but i do not know how to implement it in the app.
I want to show chats history in recyclerview by the sender and the receiver in the recyclerview.
currently i have implemented this function which caused error
private void setChatHistory(String entityBareId) {
EntityBareJid jid = null;
try {
jid = JidCreate.entityBareFrom(entityBareId);
} catch (XmppStringprepException e) {
e.printStackTrace();
}
MamManager manager = MamManager.getInstanceFor(mConnection);
MamManager.MamQueryResult r = null;
try {
try {
r = manager.mostRecentPage(jid, 10);
} catch (SmackException.NotConnectedException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
} catch (XMPPException.XMPPErrorException e) {
e.printStackTrace();
} catch (SmackException.NotLoggedInException e) {
e.printStackTrace();
} catch (SmackException.NoResponseException e) {
e.printStackTrace();
}
if (r.forwardedMessages.size() >= 1) //printing first of them
{
Message message = (Message) r.forwardedMessages.get(0).getForwardedStanza();
Log.i("mam", "message received" + message.getBody());
MessagesData data = new MessagesData("send",message.getBody());
mMessagesData.add(data);
mAdapter = new ConversationAdapter(mMessagesData);
recyclerView.setAdapter(mAdapter);
}
}
Error was
Attempt to read from field 'java.util.List org.jivesoftware.smackx.mam.MamManager$MamQueryResult.forwardedMessages' on a null object reference
At r.forwardedmessages.size()>=1.
Thanks in advance

If you want to keep history of conversation, you must save them in database. MAM just for fetching old conversation from server like when you uninstall or logout the app and decide to reinstall and get old messages.
For getting messages from server be sure you already enabled it, then forwarded messages shouldnt be null. here is a guide to enable it.

Web3j new account transacting with testrpc

I'm new to blockchain development. Currently, I'm learning the Ethereum platform and it sounds a very good environment to start with. I tested the web3j library on my Android application and it works fine. I used the following code to connect to my testrpc node:
Web3j web3 = Web3jFactory.build(new HttpService("http://192.168.1.108:8545"));
BigInteger gasPrice = BigInteger.valueOf(20000000000L);
BigInteger gasLimit = BigInteger.valueOf(500000L);
BigInteger nonce = null;
String contractAddress="0x0dd3b0efbce5c4eba2dc9b8500ecafb0b1cec28f";
String from = "0x2d6fcee3c3435ebda9184bdddf8481a87b7d1948";
List<Type> inputParameters = new ArrayList<>();
String hash ="232131231232141231231231231232123123123";
byte[] b =Arrays.copyOfRange(new BigInteger(hash, 16).toByteArray(), 1, 33);
Type _telNumber = new Bytes32(b);
Type _publicKey = new Bytes32(b);
inputParameters.add(_telNumber);
inputParameters.add(_publicKey);
Function function = new Function("addPerson",
inputParameters,
Collections.<TypeReference<?>>emptyList());
String functionEncoder = FunctionEncoder.encode(function);
Transaction transaction = Transaction.createFunctionCallTransaction(from, nonce,gasPrice,gasLimit,contractAddress,new BigInteger("0"), functionEncoder);
try {
EthSendTransaction transactionResponse = web3.ethSendTransaction(transaction).sendAsync().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
The above code worked and I was able to interact with a smart contract (call a function).
The main problem is that the from parameter is hardcoded (I got it from the testrpc list of accounts).
What I want to achieve: I want to create an application in which the users can create new wallets (accounts), and use them to transact with the network. I created the wallets succesfully using the following code:
String filePath = Environment.getExternalStorageDirectory().toString() + "/Pictures";
Web3j web3 = Web3jFactory.build(new HttpService("http://192.168.1.108:8545"));
Web3ClientVersion web3ClientVersion = null;
try {
String fileName = WalletUtils.generateNewWalletFile("your password",new File(filePath),false);
Log.d("FILENAME",fileName);
Credentials credentials = WalletUtils.loadCredentials(
"your password",
filePath+"/"+fileName);
myAddress = credentials.getAddress();
Log.d("My address",credentials.getAddress());
} catch (CipherException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
What's the next step? Should I broadcast my address to the network?

The main problem is that the from parameter is hardcoded (I got it from the testrpc list of accounts).
You can call your file and decrypt it to get your address, every time you create a new account you generate a file with your keys.
val credentialsOne = WalletUtils.loadCredentials("your password", "your path")
When you connect with your node, it will automatically detect the address

SMACK 4.1 Account manager: Private Access Error in account registration

I am getting a strange error while working with account manager in Smack 4.1 for android.
Below is the code snippet:
am = new AccountManager(connection);
Map<String, String> mp = new HashMap<String, String>();
// adding or set elements in Map by put method key and value
// pair
mp.put("username", "user3");
mp.put("password", "ps3");
mp.put("name", "user3");
mp.put("email", "user3#user.com");
try {
am.createAccount("user3", "user3", mp);
} catch (SmackException.NoResponseException e) {
e.printStackTrace();
} catch (XMPPException.XMPPErrorException e) {
e.printStackTrace();
} catch (SmackException.NotConnectedException e) {
e.printStackTrace();
}
The code I've used to connect to Openfire Server is:
XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
configBuilder.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
configBuilder.setServiceName("host_name");
configBuilder.setHost("host_name");
configBuilder.setPort(5222);
configBuilder.setCompressionEnabled(false).build();
AbstractXMPPConnection connection = new XMPPTCPConnection(configBuilder.build());
try {
System.out.println("connecting");
connection.setPacketReplyTimeout(10000);
connection.connect();
System.out.println("connected");
SASLAuthentication.unBlacklistSASLMechanism("PLAIN");
SASLAuthentication.blacklistSASLMechanism("DIGEST-MD5");
} catch (SmackException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (XMPPException e) {
e.printStackTrace();
}
and is running perfect.
The exact error is: "Error:(66, 18) error: AccountManager(XMPPConnection) has private access in AccountManager"
I've wasted like 2-3 hours trying to find it but got no answers. I'm a noob so please forgive me if this is a basic question. Also please reply on that as I am stuck and can not move forward.
Thanks alot for the time!!

You need to get an instance from the accountManager that's relevant to your Xmpp connection.
AccountManager ac = AccountManager.getInstance(XMPPConnection connection)

send sms in pdu mode using android

I am developing an application which needs to send sms in pdu mode.
I am using this code but it gives NoSuchElementException on first line.
try {
Method m2 = sms.getClass().getDeclaredMethod("sendRawPdu", pdu.getClass(), pdu.getClass(), piSent.getClass(), piDelivered.getClass());
m2.setAccessible(true);
SmsMessage.SubmitPdu pdus = SmsMessage.getSubmitPdu(null, "", "Test", false);
Object[] arrayOfObject2 = new Object[5];
arrayOfObject2[0] = pdus.encodedScAddress;
arrayOfObject2[1] = pdus.encodedMessage;
arrayOfObject2[2] = piSent;
arrayOfObject2[3] = piDelivered;
arrayOfObject2[4] = null;
try {
m2.invoke(sms, arrayOfObject2);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
Any help will be appreciated.

I tried it on Lollipop, but there is no method related to sendRawPdu
Do a little more thing just print the list of methods available to check if there is any method related to sendRawPdu
Method[] methods = sms.getClass().getDeclaredMethods();
boolean methodAvailable = false;
for(Method m : methods) {
Log.d("SmsManager", m.toString());
if(m.toString().contains("sendRawPdu")) {
methodAvailable = true;
}
}
now you have methodAvailable, if it is true you can send Raw PDU, if not then you can't. sendRawPdu was available before JellyBeans. Try to run this on Pre JellyBeans devices.

Window Azure Mobile Service select Query issue. how to make query on same column of multiple value instead only single?

I am working on android to access window azure database..
My qtn is How to make an query to access data based on single column but multiple values.?
Here is my code :
try {
mClient = new MobileServiceClient(Constant.AZURE_URL, Constant.AZURE_API_KEY, getApplicationContext());
mUsersTable = mClient.getTable(Users.class);
MobileServiceTable<Users> table = mClient.getTable(Constant.TABLE_USERS, Users.class);
table.where().field("id").eq(11)
.execute(new TableQueryCallback<Users>() {
#Override
public void onCompleted(List<Users> result, int count,
Exception exception, ServiceFilterResponse response) {
if (exception != null) {
Log.d("Exception at complete::",""+exception.getCause().getMessage());
} else {
StringBuffer sb = new StringBuffer();
for (Users users_obj : result) {
System.out.println("NAMESS::::"+users_obj.getFirstName());
// userID_arr.add(users_obj.getFirstName());
}
//System.out.println("User Array"+userID_arr);
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
Log.e("Error Mobile Service Authentication", "There was an error creating the Mobile Service. Verify the URL");
}
catch (Exception e) {
e.printStackTrace();
}
There for I am able to get complete row on the basis of single parameter in table.where().feilds.eq(11)................... so instead 11 i want to add dynamic values on .eq() ....what is approach in Android auzre to get values on multiple id request ?