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You have almost arrived at where you can implement the code and API into your application. To this point, you have entered all the information necessary for the test account, but you must complete one last item. Specifically, you have to create and configure a test certificate for use within the sandbox account, which will provide an additional layer of security. I ll first explain what the test certificate is. The test certificate is linked to the sandbox account and needs to be created to use the PayPal web services and API within the code of your application. You need to submit a username and password to obtain a certificate from the PayPal servers prior to any submission of credit card data or product data that is being tendered. This is not to say that you won t need a Secure Sockets Layer (SSL) certificate installed on the web server, but the certificate does provide additional security because the account that uses the API code will not simply accept a username and password combination. It will also require that the correct associated certificate appears in the same executing file location. In other words, you will need a test certificate for the test environment and then a live certificate for the live PayPal services. Before you configure the test certificate, be aware that it is not simply as easy as downloading a certificate and adding it to the web project. You need to perform a number of steps to set it up successfully. Don t worry, because I will outline all these details in the following exercise, which shows how to create the test certificate.

< xml version="1.0" encoding="utf-8" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <AnalogClock android:id="@+id/analog" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_alignParentTop="true" /> <DigitalClock android:id="@+id/digital" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_below="@id/analog" /> </RelativeLayout>

This exercise shows all the intricacies involved in obtaining the test certificate to be prepared for use within the transactions. Follow these steps: 1. If you happen to have the PayPal Development Central (https://developer.paypal.com/) account still open in your browser from the previous exercise, it is a good bet that the session has timed out. So, log out of the account, and reenter your credentials. When arriving at the home page, click the Sandbox tab, and then click the Launch Sandbox button with the sandbox account selected that you created earlier in this chapter, as shown in Figure 18-20.

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We have been implementing onCreate() in all of our Activity subclasses in every example. This will get called in three situations: When the activity is first started (e.g., since a system restart), onCreate() will be invoked with a null parameter. If the activity had been running, then sometime later was killed off, onCreate() will be invoked with the Bundle from onSaveInstanceState() as a parameter. If the activity had been running and you have set up your activity to have different resources based on different device states (e.g., landscape versus portrait), your activity will be re-created and onCreate() will be called. Here is where you initialize your user interface and set up anything that needs to be done once, regardless of how the activity gets used. On the other end of the lifecycle, onDestroy() may be called when the activity is shutting down, either because the activity called finish() (which finishes the activity) or because Android needs RAM and is closing the activity prematurely. Note that onDestroy() may not get called if the need for RAM is urgent (e.g., incoming phone call) and that the activity will just get shut down regardless. Hence, onDestroy() is mostly for cleanly releasing resources you obtained in onCreate() (if any).

Without any Java code other than the generated stub, we can build this project and get the activity shown in Figure 9 4.

Figure 18-20. Clicking the Launch Sandbox button 2. When you click the Launch Sandbox button, the site will launch a new browser window where you will be again asked to log in using your sandbox test account, as shown in Figure 18-21.

3. Once you have logged into the sandbox account successfully, from the home page, click the Profile tab, as shown in Figure 18-22.

If you are looking for more of a timer, Chronometer may be of interest. With a Chronometer, you can track elapsed time from a starting point. You simply tell it when to start() and stop(), and possibly override the format string that displays the text. Figure 9 5 shows an example.

onStart(), onRestart(), and onStop()

Figure 18-22. Clicking the Profile tab 4. When directed to the Profile page, from the column on the left, click the API Access link, as shown in Figure 18-23.

If you need to be doing something for a long period of time, you owe it to your users to do two things: Use a background thread. Keep them apprised of your progress, lest they think your activity has wandered away and will never come back. The typical approach to keeping users informed of progress is to display some form of progress bar, or throbber (like the animated graphic that appears near the upper-right corner of many web browsers). Android supports this through the ProgressBar widget.

5. After clicking the API Access link, you will see the API Set-up page with two options. Select the option on the right, Request API Credentials, as shown in Figure 18-24.

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