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With this certificate installed on the web server, all information passed through the secure channel will be encrypted and therefore will prevent someone from intercepting the transmission from the client to the server Another option to consider is to not use and implement your own SSL certificate and instead leverage that of the processing company For instance, when using PayPal as the credit card processing company, you have many options The ability is available to process your own transactions in the sense of implementing your own SSL certificate, or you can leverage a premade shopping cart and use the associated security that the processing company ultimately provides The decision will usually become clear after the system or application that is being built is defined In either case, it is good to always be aware of the options available.

The insert() method returns a Uri for you to use for future operations on that new object. The bulkInsert() method returns the number of created rows; you would need to do a query to get back at the data you just inserted. For example, here is a snippet of code from ConstantsBrowser to insert a new constant into the content provider, given a DialogWrapper that can provide access to the title and value of the constant: private void processAdd(DialogWrapper wrapper) { ContentValues values=new ContentValues(2); values.put(Provider.Constants.TITLE, wrapper.getTitle()); values.put(Provider.Constants.VALUE, wrapper.getValue()); getContentResolver().insert(Provider.Constants.CONTENT_URI, values); constantsCursor.requery(); } Since we already have an outstanding Cursor for the content provider s contents, we call requery() on that to update the Cursor s contents. This, in turn, will update any SimpleCursorAdapter you may have wrapping the Cursor and that will update any selection widgets (e.g., ListView) you have using the adapter. To delete one or more rows from the content provider, use the delete() method on ContentResolver. This works akin to a SQL DELETE statement and takes three parameters: 1. A Uri representing the collection (or instance) you wish to update 2. A constraint statement, functioning like a SQL WHERE clause, to determine which rows should be updated 3. An optional set of parameters to bind into the constraint clause, replacing any s that appear there

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If you have a lot of preferences for users to set, putting them all in one big list may not be the best idea. Android s preference framework gives you a few ways to impose a bit of structure on your bag of preferences, including categories and screens. Categories are added via a PreferenceCategory element in your preference XML and are used to group together related preferences. Rather than have your preferences all as children of the root PreferenceScreen, you can place a few PreferenceCategory elements in the PreferenceScreen, and then put your preferences in their appropriate categories. Visually, this adds a divider with the category title between groups of preferences. If you have a whole lot of preferences more than are convenient for users to scroll through you can also put them on separate screens by introducing the PreferenceScreen element. Yes, that PreferenceScreen element. Any children of PreferenceScreen go on their own screen. If you nest PreferenceScreens, the parent screen displays the screen as a placeholder entry, and tapping that entry brings up the child screen. For example, from the Prefs/Structured sample project, here is a preference XML file that contains both PreferenceCategory and nested PreferenceScreen elements:

Lastly, the best practice to use when and if it is necessary to store any sensitive data within the system is to encrypt the data, making it difficult for an intruder to access and interpret this data You should implement this regardless of how you will actually process the credit card transactions..

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> <PreferenceCategory android:title="Simple Preferences"> <CheckBoxPreference android:key="checkbox"

Having any system available to anyone on the Internet poses the risk of it being attacked by an intruder. This form of attack can be malicious and be by someone purposely looking for sensitive data such as Social Security numbers, credit card data, or checking account information. Another kind of attack could be to simply disrupt your system from running properly by infecting it with a virus or just slowing down the system. Let s look at these different types of attacks in more detail.

Beware of the BLOB!

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