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A logic circuit is one designed to give an output of either on or off, which are represented by the binary numbers 1 and 0. The off (or zero) state is a voltage near to zero volts at the output; a state of on (or 1) is represented by a higher level, closer to the supply voltage. The simplest representation of a logic circuit is a switch (see Figure 2-9).

You may have introduced a TabHost into your UI to allow you to display more widgets in the available screen space. As long as the widget space you save by moving them to a separate tab is more than the space taken up by the tabs themselves, you win. However, having multiple tabs means more user steps to navigate your UI, particularly if the user needs to flip back and forth between tabs frequently. If you have only two tabs, consider changing your UI to offer a large-screen layout that removes the tabs and puts all the widgets on one screen. This places everything in front of the user, without needing to switch tabs all the time. If you have three or more tabs, you probably will lack screen space to put all those tabs contents on one activity. However, you might consider going half and half: have popular widgets be on the activity all of the time, leaving your TabHost to handle the rest on (roughly) half of the screen.

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In this chapter, you learned how to store the shopping cart information in the database, and you learned a few things in the process as well. Probably the most interesting was the way you can store the shopping cart ID as a cookie on the client, because you haven t done anything similar so far in this book. When writing the code for the user interface, you learned how to allow the visitor to update multiple GridView records with a single click, and you also implemented a clever strategy for the Continue Shopping functionality. At the end, you updated the administrative part of the web site to deal with the new challenges implied by your custom-created shopping cart. You ll complete the functionality offered by the custom shopping cart in the next chapter with a custom checkout system. You ll add a Place Order button to the shopping cart, which allows you to save the shopping cart information as a separate order in the database. See you in the next chapter!

When the switch is open, no current can flow through it and no voltage can be measured at the output. When you close the switch, the current can flow through it, thus a voltage can be measured at the output. The open state can be thought of as a 0 and the closed state as a 1 in a logic circuit. In a logic circuit, if the expected voltage to represent the on (or 1) state is 5v, it s important that when the circuit outputs a 1 that the voltage is as close to 5v as possible. Similarly, when the output is a zero (or off), it is important that the voltage is as close to zero volts as possible. If you do not ensure that the states are close to the required voltages, that part of the circuit may be considered to be floating (it is neither in a high or low state). The floating state is also known as electrical noise, and noise in a digital circuit may be interpreted as random 1 s and 0 s. This is where pull up or pull down resistors can be used to ensure the state is high or low. If you let that node in the circuit float, it may be interpreted as either a zero or a one, which is not desirable. It s better to force it towards a desired state.

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