Android Programming Tutorials

Look Inside Yourself

Step #3: Find the Correct Contact Uri

Since we want this particular code to run on a variety of Android releases,

we need to figure out the right Uri to use to wrap in an ACTION_PICK Intent

to let the user pick a contact. In Android 2.0 and newer, the Uri is

android.provider.ContactsContract.Contacts.CONTENT_URI, while in Android

1.6 and earlier, the Uri is android.provider.Contacts.People.CONTENT_URI.

Fortunately, this value will not change during the execution of our

application, so we can find out the right value via a static initializer, then

use the value throughout the application.

Hence, add the following static data member and initializer block to

Contacter, along with the required imports:

private static Uri CONTENT_URI=null;

static {

int sdk=new Integer(Build.VERSION.SDK).intValue();

if (sdk>= 5 ) {

try {

Class clazz=Class.forName("android.provider.ContactsContract$Contacts");

CONTENT_URI=(Uri)clazz.getField("CONTENT_URI").get(clazz);

}

catch (Throwable t) {

Log.e("PickDemo", "Exception when determining CONTENT_URI", t);

}

}

else {

CONTENT_URI=Contacts.People.CONTENT_URI;

}

}

Step #4: Attach the Button to the Contacts

Next, we want to arrange to let the user pick a contact when the button is

clicked.

To do this, add the following implementation of onCreate() to Contacter:

307