Android (Java) Learning note 249:contentprovider Use to get system contact information

1. Database of system contacts (3 most important tables)

(1) Raw_contacts Contact Form

Save the contact's ID contact_id

(2) Data sheet

Save the contact's data

(3) Mimetypes

MIME Data type Table

2. Thinking? How to get the data for a contact.

(1) query raw_contacts get all the contact ID;

(2) according to the ID query data table, to obtain the current contact information;

3. Because if you want to access ContentProvider, you must understand the URI settings (Authority,path, etc.); only the source code can be seen; Androidmanifest.xml is a manifest file that lists the authorities of Contactprovider and the permissions required to access the Address book;

4. Address Book Database structure introduction:

The table structure is as follows:

The contacts are stored in/data/data/com.android.providers.contacts/databases/contacts2.db, and the main tables are:

(1) Raw_contacts: The ID of the person who stored the contact,

The _id property is the primary key, declared as AutoIncrement, i.e. no manual setting is required, and other properties do not need to be manually set to have default values;

Display_name attribute is name;

(2) Mimetypes: The type of data stored, such as "Vnd.android.cursor.item/name" for "name" type of data, "VND.ANDROID.CURSOR.ITEM/PHONE_V2" for "phone" type of data ；

(3) Data: storage of specific information;

The Raw_contact_id property is used to connect the Raw_contacts table, each record represents a specific data, and our main data (email, phone, etc.) are stored in the database table;

DATA1 attribute holds total data;

DATA2 Properties:

-If the record holds a name, data2 the name of the store;

-If this record holds the phone, then data2 storage type, such as mobile phone, home appliance;

-If this record holds the organization, then the DATA2 storage type, such as company, other;

-If this record holds the address, then data2 storage type, such as residential, unit, etc.;

5. Programming Tips:

Uri

Add, delete, update operations to the Raw_contacts table:

URI = content://com.android.contacts/raw_contacts;

Add, delete, update operations to the data table: URI = content://com.android.contacts/data; Query the data table according to email:

URI = content://com.android.contacts/data/emails/filter/*

Query the data table based on the phone number

URI = content://com.android.contacts/data/phone/filter/*

if you want to query the phone by ID, you can URI = content://com.android.contacts/data; then the WHERE condition is: raw_contact_id=? and mimetype =?

 

MIMETYPE Tel: vnd.android.cursor.item/phone_v2 Name: Vnd.android.cursor.item/name Mail: Vnd.android.cursor.item/email_v2 Correspondence Address: Vnd.android.cursor.item/postal-address_v2 Organization: Vnd.android.cursor.item/organization Photo: Vnd.android.cursor.item/photo

Constants in data

data._id: "_id"

Data.display_name: "Display_name"

DATA.DATA1: "Data1"

DATA.DATA2: "Data2"

data.raw_contact_id: "raw_contact_id"

Data.mimetype: "MIMETYPE"

Android (Java) Learning note 249:contentprovider Use to get system contact information