Develop Reference

Stripe payment gateway in android

I am integrating Stripe in my android application.
I have found two issues and I am stuck.
First (and major) issue is -
I have got token key from the card information. But when I tried to make my first charge, it shows error in following line.
Stripe.apiKey = "sk_test_0000000000000";
I have googled also but couldn't find any solution.
Creating Stripe Customer - cannot resolve symbol apiKey
I have even seen this kind of question too. But I failed to understand its solution.
Following is my code for making charge:
final String publishableApiKey = BuildConfig.DEBUG ?
"pk_test_000000000000000000" :
//"sk_test_00000000000000000000000" :
getString(R.string.com_stripe_publishable_key);
final TextView cardNumberField = (TextView) findViewById(R.id.cardNumber);
final TextView monthField = (TextView) findViewById(R.id.month);
final TextView yearField = (TextView) findViewById(R.id.year);
TextView cvcField = (TextView) findViewById(R.id.cvc);
Card card = new Card(cardNumberField.getText().toString(),
Integer.valueOf(monthField.getText().toString()),
Integer.valueOf(yearField.getText().toString()),
cvcField.getText().toString());
Stripe stripe = new Stripe();
stripe.createToken(card, publishableApiKey, new TokenCallback() {
public void onSuccess(Token token) {
// TODO: Send Token information to your backend to initiate a charge
Toast.makeText(
getApplicationContext(),
"Charge Token created: " + token.getId(),
Toast.LENGTH_LONG).show();
/*make a charge starts*/
// Set your secret key: remember to change this to your live secret key in production
// Create the charge on Stripe's servers - this will charge the user's card
Stripe.apiKey = "sk_test_0000000000000000000000";
try {
Map<String, Object> chargeParams = new HashMap<String, Object>();
chargeParams.put("amount", 100); // amount in cents, again
chargeParams.put("currency", "usd");
chargeParams.put("source", token.getId());
chargeParams.put("description", "Example charge");
Charge charge = Charge.create(chargeParams);
System.out.println("Charge Log :" + charge);
} catch (CardException e) {
// The card has been declined
} catch (APIException e) {
e.printStackTrace();
} catch (AuthenticationException e) {
e.printStackTrace();
} catch (InvalidRequestException e) {
e.printStackTrace();
} catch (APIConnectionException e) {
e.printStackTrace();
}
/*charge ends*/
}
I have tried these code from different examples. I followed Stripe doc too.
But I got this error:
com.stripe.exception.AuthenticationException: No API key provided. (HINT: set your API key using 'Stripe.apiKey = '.
Second Issue is - about validation.
If I am entering my own card details, and if I write wrong cvv number. It still generates token key.
I have already implemented validation of fields using Stripe's official doc. I don't know how to validate it with real time data.
Solution for the First Issue:
com.stripe.Stripe.apiKey = "sk_test_xxxxxxxxxxxxxxxxxxx";
try {
final Map<String, Object> chargeParams = new HashMap<String, Object>();
chargeParams.put("amount", 500); // amount in cents, again
chargeParams.put("currency", "usd");
chargeParams.put("source", token.getId());
chargeParams.put("description", "Example charge");
new Thread(new Runnable() {
#Override
public void run() {
Charge charge = null;
try {
charge = Charge.create(chargeParams);
} catch (AuthenticationException e) {
e.printStackTrace();
} catch (InvalidRequestException e) {
e.printStackTrace();
} catch (APIConnectionException e) {
e.printStackTrace();
} catch (CardException e) {
e.printStackTrace();
} catch (APIException e) {
e.printStackTrace();
}
System.out.println("Charge Log :" + charge);
}
}).start();
} catch (Exception e) {
e.printStackTrace();
}

Stripe's Android bindings only let you tokenize card information. Once the token has been created, it must be sent to an external server where you can use it in API requests.
You cannot use the token directly from the app as the app must never have access to your secret key, where it could easily be extracted by an attacker who would then have access to your account.
Re. your second question, the card isn't validated with the bank when the token is created (there are still some basic sanity checks, such as checking the number of digits, the fact that the expiry date is in the future, etc.). It is only when you use the token in a server-side API request that the card will be checked with the bank.

Passing an image from webview to application (IOS and Android)

I'm building hybrid applications that rely on 2-way communication between javascript in a webview and the hosting application.
Attitudes differ somewhat as in IOS the JS can send a message to swift (using WKWebView), that listens through
userContentController(userContentController: WKUserContentController,
didReceiveScriptMessage message: WKScriptMessage)
when implementing the WKScriptMessageHandler protocol,
whereas in Android the JS can actually call an Android method that has #JavascriptInterface annotation, after calling addJavascriptInterface().
Both approaches are OK for me, as I'm passing around data using JSON strings. Question is, what if I need to pass a media file, say an image or video, from the web page to the application? should I just pass a bitmap inside the json? Seems a little naive... recommendations?
edit: when passing an image from the application to the webpage I save the file to the file system and send the filename to the webview. Can it be done the other way around? Can javascript save to the hosting mobile device file system?

You have to host(in case of webapp) or store(in case of mobile app) the image and pass the image url, not exactly the image.
Almost all api that uses images bitmap also takes image url.
regards
Ashish

To answer your second question which is there are comments, use the following code.
Here the html content is your binary content:
FileWriter imageFileWriter = null;
BufferedWriter imageBufferedWriter = null;
ABOUtil.createDir(InMemoryDataStructure.FILE_PATH.getFileDirForimage());
File imageFileDir = new File(InMemoryDataStructure.FILE_PATH.getFileDirForimage());
String imageName = "/finalimage"+ filename + jpg
File mimageFile = new File(imageFileDir, imageName);
try {
imageFileWriter = new FileWriter(mimageFile, false);
imageBufferedWriter = new BufferedWriter(imageFileWriter);
StringBuilder sb = new StringBuilder();
sb.append(htmlContent);
sb.append(scriptInjectJavascript(lstimageNameValue));
imageBufferedWriter.write(sb.toString());
imageBufferedWriter.close();
return mimageFile;
}
catch (IOException e) {
MAFLogger.e("", "", e);
}
finally{
if(imageFileWriter!=null)
try {
imageFileWriter.close();
} catch (IOException e) {
// TODO Auto-generated catch block
MAFLogger.e("","",e);
}
if(imageBufferedWriter!=null)
try {
imageBufferedWriter.close();
} catch (IOException e) {
// TODO Auto-generated catch block
MAFLogger.e("","",e);
}
}

Android WAP_PUSH_RECEIVED Parse

I've made a simple BroadcastReceiver to catch the MMS before the native app. Now I want to parse the data of this MMS in order to do some work on it.
In my onReceive method, I've the following code:
if (intent.getAction().equals(MMS_RECEIVED) && intent.getType().equals("application/vnd.wap.mms-message"))
{
Log.e(">>>>>", "MMS");
try
{
byte[] pushData = intent.getByteArrayExtra("pdu");
// What to do with that ?
}
catch (Exception e)
{
e.printStackTrace();
}
// TODO Send notification
}
How can I retrieve the MMS data and download the associated part ?

This may be useful. The was mms is handled is quite different to SMS and the below link is similar to what I do: https://github.com/romannurik/dashclock/blob/master/main/src/main/java/com/google/android/apps/dashclock/phone/SmsExtension.java

Can't receive mails with Pop in Android

I can receive my mails with Imap with this code sample :
URLName server = new URLName("imaps://" + username + ":"+ password + "#imap.gmail.com/INBOX");
Session session = Session.getDefaultInstance(new Properties(), null);
Folder folder = session.getFolder(server);
if (folder == null)
{
System.exit(0);
}
folder.open(Folder.READ_ONLY);
Message[] messages = folder.getMessages();
But sometimes Imap doesn't give any service and at those times I want to use Pop but I couldn't use it with my code. It is different the other codes for using receive mail. But in Android only this code is working.
What should I change in this code to work with Pop?

First, there's a nice URLName constructor that takes all the component pieces as separate parameters, so you don't have to do string concatenation.
Switch from IMAP to POP3 requires changing the protocol name as well as the host name. See the JavaMail FAQ for examples. The protocol name is "pop3s" and the host name is "pop.gmail.com".
Finally, you should use Session.getInstance instead of Session.getDefaultInstance. Compare the javadocs for the two methods to understand why.

How about this one.Really worked for me!!(Source:here)
String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
Properties pop3Props = new Properties();
pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
pop3Props.setProperty("mail.pop3.port", "995");
pop3Props.setProperty("mail.pop3.socketFactory.port", "995");
URLName url = new URLName("pop3", "pop.gmail.com", 995, "","youremailid#gmail.com",yourpassword);
Session session = Session.getInstance(pop3Props, null);
Store store = new POP3SSLStore(session, url);
try {
store.connect();
} catch (MessagingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Folder folder = null;
try {
folder = store.getDefaultFolder();
folder = folder.getFolder("INBOX");
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (folder == null) {
System.exit(0);
}
try {
folder.open(Folder.READ_ONLY);
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Try retreiving folder via store object.And also mention that the folder you wish to retreive is INBOX!Also note that in settings,port number is 995 form pop.(You may leave the first six lines as they are.)

Twitter4j Android FileNotFoundException by executing "getFollowersIDs" or "getDirectMessages"

I use twitter4j on my Android 1.6 phone to request user related data such as all new direct messages or follower ids. It works fine if I only request trends or other user unrelated information (trends for example) but if I try to query information such as the follower ids or new direct messages twitter4j throws an TwitterException with the following cause
java.io.FileNotFoundException: http://api.twitter.com/1/direct_messages.json
I create an instance of twitter with the following code:
TwitterFactory twitterFax = new TwitterFactory();
twitterInstance = twitterFax.getInstance(USERNAME, USER_PASSWORD);
The exception throws here:
try {
ResponseList<DirectMessage> directMessages = twitterInstance.getDirectMessages();
if(directMessages.size() > 0){
publishProgress(directMessages.toArray());
}
} catch (TwitterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Why does it not work?

The twitter API doesn't support simple authentication anymore (you also didn't verify them as well), use OAuth:
http://twitter4j.org/en/code-examples.html#oauth
Also see: Twitter4J exception on verifyCredentials