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Android: A Programmer s Guide
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Using the Dialer
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Now that you know what an Intent is, it is time to see one in action This section shows you how to use the DIAL_ACTION Intent to open the phone dialer You will pass a telephone number with your Intent If your application works correctly, you should see displayed in the dialer the number you pass with your Intent The first step is to create a new project for this Activity (see 5 for instructions) Name the project AndroidPhoneDialer The following illustration shows the New Android Project wizard for this project
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With your new application open in Eclipse, the first order of business is to remove the TextView from mainxml that contains that Hello World statement The mainxml file should look like this after you remove the TextView:
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< xml version="10" encoding="utf-8" > <LinearLayout xmlns:android=http://schemasandroidcom/apk/res/android
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Using Intents and the Phone Dialer
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android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > </LinearLayout>
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You need to add two new packages to your project to utilize the DIAL_ACTION Intent, as follows The first package allows you to set up Intents and the second allows you to parse URIs
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import androidcontentIntent; import androidnetUri;
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NOTE
There are several different Intent Filters on the DIAL_ACTION Intent that you can use You are using the Filter that lets you pass a phone number as a URI
The next step is to create your Intent The syntax for creating an Intent is as follows:
Intent <intent_name> = new Intent(<Android_Intent>,<data>)
For your application, replace the first parameter, <intent_name>, with DialIntent To get the value for the second parameter, <Android_Intent>, refer to the list of Activity Actions in Table 7-1 You ll find that, to call the dialer, you need to use the DIAL_ACTION Intent To call the Intent properly, use the format IntentDIAL_ ACTION The last parameter, <data>, is the phone number The DIAL_ACTION Intent takes in data as a URI Thus, you need to use Uriparse to parse out your phone number Using Uriparse will ensure that the DIAL_ACTION Intent understands the number you are trying to dial You pass Uriparse a string that represents the phone number you want to dial, "tel:5551212" in this example The final call to create an Intent for your project should look like this:
Intent DialIntent = new Intent(IntentDIAL_ACTION,Uriparse("tel:5551212"));
You use the notation tel:<phone_number> to dial a specific phone number You can also use voicemail: instead of tel: to dial the phone s voicemail shortcut
Android: A Programmer s Guide
With the Intent created, you now have to tell Android that you want the dialer to be launched in a new Activity To do this, you use the setLaunchFlags( ) method of the Intent You must pass setLaunchFlags( ) the appropriate parameter for launching The following is a list of the possible launch flags that you can set:
NOTE
In some cases, more than one of the following flags may be set to accomplish the desired outcome
NO_HISTORY_LAUNCH Launches the Activity without recording it in the system s launch history SINGLE_TOP_LAUNCH Tells the system not to launch the Activity if it is already running NEW_TASK_LAUNCH Launches the Activity MULTIPLE_TASK_LAUNCH Launches the Activity even if it is already running FORWARD_RESULT_LAUNCH Allows the new Activity to receive results that would normally be forwarded to the existing Activity
In this case, you want to use IntentNEW_TASK_LAUNCH, which simply lets you open a new instance of the dialer Activity:
DialIntentsetLaunchFlags(IntentNEW_TASK_LAUNCH );
The last step to creating your dialer Intent is to actually launch the Activity (More accurately, you are telling Android that you have an intent to launch the dialer as a New Task It is ultimately up to Android to launch the Dialer Activity) To tell Android that you want to start the dialer, you need to use startActivity( ):
startActivity(DialIntent);
Notice that you pass to startActivity( ) your Intent The Intent is then passed to Android, and the action is resolved The full code for AndroidPhoneDialerjava should look like this:
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