.net barcode reader camera Managing contacts in Java

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Listing 15.4
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Retrieving email information for a selected contact
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public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case (CONTACT_SELECTED): if (resultCode == Activity.RESULT_OK) { Uri contactData = data.getData(); Cursor c = managedQuery(contactData, null, null, null, null); if (c.moveToFirst()) { try { int contactID = c.getInt(c.getColumnIndexOrThrow (ContactsContract.Contacts._ID)); Look up email Uri uri = ContactsContract. information CommonDataKinds.Email.CONTENT_URI; Only retrieve String[] projection = new String[] { email value ContactsContract.CommonDataKinds. Email.DATA }; #B String selection = ContactsContract. CommonDataKinds.Email.CONTACT_ID + Limit results "= "; to this contact String[] selectionArgs = new String[] { "" + contactID }; c.close(); c = managedQuery(uri, projection, selection, selectionArgs, null); String message; if (c.moveToFirst()) { message = "Selected email address " + c.getString(0); } else { message = "No email address found."; } Toast.makeText(this, message, 2000).show(); } finally { c.close(); } } } break; } }
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If you run this code, you ll see a Toast with either a selected email address or a graceful error message. Please review chapter 8 if you d like a reminder of how Toast objects work. The data table is open-ended, so a user may have multiple email addresses. Depending on the needs of your application, you could choose to iterate through all of them or only pick one, as shown in this example. You can adopt this technique to retrieve any other data about a contact selected by the user. Browse the classes within ContactsContract.CommonDataKinds for natively supported fields, or use custom fields added by your own application.
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Integration
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An Android contact is a transient thing. Users may join different contacts together, split them apart, or delete them altogether. As such, you should avoid holding onto a contact ID for a long time and using it in future queries. If you need to retain a longlived reference to a contact, such as a list of the user s gaming buddies, then instead of the contact ID you should use the lookup key, which is a column defined by ContactsContract.Contacts.LOOKUP_KEY. The lookup key will continue to work even if the user joins or separates the contact. But using the lookup key is slower than the contact ID, so if speed is critical in your application, you may want to keep both the contact ID and the lookup key, and only use the lookup key if retrieving by ID fails.
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15.3.2 Requesting operations from your app
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Now that we ve retrieved contact data from the native app, let s see how to edit that data. You ll often want to use the native contact app to perform edits, because users are comfortable and familiar with this interface. To create a new contact, use Intent.ACTION_INSERT. By itself this will pop open an empty contact for the user to fill out, which isn t terribly useful. Most often, you ll have some pieces of information about a new contact and ask the user to supply the rest. For example, your app might retrieve screen names and email addresses from a social networking service. You could fill out these portions of the contact ahead of time and let the user finish adding the person s name in the native contacts app. Figure 15.7 shows a prepopulated contacts screen that was generated by an application. Listing 15.5 shows how to generate this sort of screen. The fields that you can optionally prepopulate are available as static fields in the ContactsContract. Intents.Insert convenience class.
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Listing 15.5
Figure 15.7 Partially complete contact requested by application
Adding a contact using the native contacts app
private void createContact() { Intent creator = new Intent(Intent.ACTION_INSERT, ContactsContract.Contacts.CONTENT_URI); creator.putExtra(ContactsContract.Intents.Insert. NAME, "Oedipa Maas"); creator.putExtra(ContactsContract.Intents.Insert. EMAIL, "oedipa@waste.example.com"); startActivity(creator); }
Insert contact Define initial values
Managing contacts
To edit a contact, request Intent.ACTION_EDIT. But unlike creating or picking a contact, when editing a contact you need a reference to a specific person. You could retrieve one by launching the picker, but that s needlessly cumbersome. Instead, query for a particular contact, and then use its returned ID to launch the edit activity, as shown in the next listing.
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