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an implementation, including the required onCallStateChanged method. When you have a valid PhoneStateListener instance, you attach it by assigning it to the manager with the listen method. Listing 7.2 shows how to listen for any PhoneStateListener.LISTEN_CALL_STATE change in the phone state. This constant value comes from a list of available states that are in PhoneStateListener class. You can use a single value when assigning a listener with the listen method, as demonstrated in listing 7.2, or you can combine multiple values to listen for multiple states. If a call state change does occur, it triggers the action defined in the onCallStateChanged method of your PhoneStateListener. In this example, we reset the details on the screen using the getTelephonyOverview method from listing 7.1. You can filter this method further, based on the passed-in int state. To see the values in this example change while you re working with the emulator, you can use the SDK tools to send incoming calls or text messages and change the state of the voice connection. You can access these options from the DDMS perspective in Eclipse. Additionally, the emulator includes a mock GSM modem that you can manipulate using the gsm command from the console. Figure 7.3 shows an example session from the console that demonstrates using the gsm command. For complete details, see the emulator telephony documentation at http://code.google.com/ android/reference/emulator.html#telephony. Now that we ve covered the major elements of telephony, let s start exploring basic uses of the telephony APIs and other related facilities. We ll intercept calls, leverage telephony utility classes, and make calls from within applications.

$oldw $oldh $step $max $ratio $j Integer representing the image s current width Integer representing the image s current height Float representing the amount of each enlargement Integer representing the number of steps to take Float representing the new width relative to the height Temporary counter to track iterations

' * ' *** ' * * * ' * ' * ' * ' *

In regular development, you ll often want to use your Android device as a phone. You might dial outbound calls through simple built-in intents, or intercept calls to modify them in some way. In this section, we ll cover these basic tasks and examine some of the phone-number utilities Android provides for you. One of the more common things you ll do with Android telephony support doesn t even require using the telephony APIs directly: making calls using built-in intents.

4:

As we demonstrated in chapter 4, to invoke the built-in dialer and make a call all you need to use is the Intent.ACTION_CALL action and the tel: Uri. This approach invokes the dialer application, populates the dialer with the provided telephone number (taken from the Uri), and initiates the call. Alternatively, you can invoke the dialer application with the Intent.ACTION_DIAL action, which also populates the dialer with the supplied phone number but stops short of initiating the call. The following listing demonstrates both techniques using their respective actions.

' * ' * ' * ' * ' * * * ' *** ' *

This plug-in first makes a note of the image s current dimensions, placing them in $oldw and $oldh, and then calculates the step size between each of the enlargements This is derived by multiplying the value of (31415927) by the amount of smoothing required You may ask, Why this formula Well, I have to be honest here I tried dozens of different step sizes until it occurred to me to enter , and then the amount of smoothing increased substantially Without being able to explain why, I suspect it has something to do with sines and cosines and the resampling routines used by the GD library Anyway, armed with these values, a for loop then iterates through all the steps, enlarging the original image a little at a time by passing it to plug-in number 12, Image Resize Because each step is a floating point number, the final image will be close to, but rarely exactly, the new dimensions required Therefore, before returning the final enlargement, PIPHP_ImageResize() is called one last time to ensure the exact size needed is returned

dialintent = (Button) findViewById(R.id.dialintent_button); dialintent.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(Intent.DIAL_ACTION, Uri.parse("tel:" + NUMBER)); startActivity(intent); } }); callintent = (Button) findViewById(R.id.callintent_button); callintent.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(Intent.CALL_ACTION, Uri.parse("tel:" + NUMBER)); startActivity(intent); } });

By now you should feel quite comfortable using intents in the Android platform. In this listing, we again take advantage of Android s loose coupling, in this case to make outgoing calls to specified numbers. First, you set the action you want to take place, either populating the dialer with ACTION_DIAL or populating the dialer and initiating a call with ACTION_CALL. In either case, you also need to specify the telephone number you want to use with the Intent Uri. Dialing calls also requires the proper permissions, which your application manifest includes in order to access and modify the phone state, dial the phone, or intercept

To enlarge an image with this plug-in, you must already have it stored as a GD image object, which you then pass to PIPHP_ImageEnlarge(), along with the new width and height, and a smoothing level, like this:

' ============================= Begin Main Program =============================== dirsB = %10111111 dirsC = %10111111 hsersetup B4800_64, %111 ' configure portB (B6 is hserin pin) ' configure portC (C6 is input only) ' setup for background serial receive