利用内容观察者操作系统的联系人(查询，加入)

系统联系人的源代码包位于/data/data/com.android.providers.contacts文件夹下，导出contacts2,db。用SQLLite查看数据库结构：

raw_contacts表：保存联系人的引用，当中contact_id存放联系人的id

data表：联系人信息的详细数据

                raw_contact_id与raw_contacts表中的contact_id相相应

                data1表示联系人的详细数据信息，

               mimetype_id表示详细的类型，与mimetypes表的id相应

mimetypes表：数据的详细类型。

所以联系人的信息要存放在数据库。须要使用三张表。

获取联系人信息步骤：

1、查询raw_contacts表，获取联系人的id

2、依据id查询data表，得到联系人的详细数据

3、依据数据类型，到mimetypes表中查询数据代表的是什么

因为google在实现内容提供者时。对data和mimetypes表实现了关联查询，相应的ContactsProvider2.java中处理关联的源码为：

 第624行：sDataProjectionMap.put(Data.MIMETYPE, Data.MIMETYPE);

所以查询操作仅仅有两步：

处理代码为：

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.fragment_main);
//		queryContact();
		insertContact();
	}
	private void insertContact() {
		//1、向raw_contact表中加入一条id,获取此表中最大的id值进行加1
		Uri uri=Uri.parse("content://com.android.contacts/raw_contacts");
		Uri datauri=Uri.parse("content://com.android.contacts/data");
		Cursor cursor=getContentResolver().query(uri, new String[]{"contact_id"}, null, null, null);
		int id=1;
		if(cursor.moveToLast()){
			id=cursor.getInt(0);
		}
		int newid=id+1;
		ContentValues values= new ContentValues();
		values.put("contact_id", newid);
		getContentResolver().insert(uri, values);
		//2、向data表中插入数据
		ContentValues nameValue=new ContentValues();
		nameValue.put("raw_contact_id", newid);
		nameValue.put("mimetype", "vnd.android.cursor.item/name");
		nameValue.put("data1", "lili");
		getContentResolver().insert(datauri, nameValue);
		
		ContentValues emailValue=new ContentValues();
		emailValue.put("raw_contact_id", newid);
		emailValue.put("mimetype", "vnd.android.cursor.item/email_v2");
		emailValue.put("data1", "aa@163.com");
		getContentResolver().insert(datauri, emailValue);
		
		ContentValues phoneValue=new ContentValues();
		phoneValue.put("raw_contact_id", newid);
		phoneValue.put("mimetype", "vnd.android.cursor.item/phone_v2");
		phoneValue.put("data1", "18623567655");
		getContentResolver().insert(datauri, phoneValue);
	}

	private void queryContact() {
		//查询raw_contacts表【是操作另外应用程序的数据库。须要用到内容提供者，到系统源码中查找ContactsProvider清单文件，获得Uri】
		//【查找ContactsProvider2.java知道系统源码数据库的表名怎样定义】
		Uri uri=Uri.parse("content://com.android.contacts/raw_contacts");
		//data表相应的uri
		Uri datauri=Uri.parse("content://com.android.contacts/data");
		//此处仅仅关心从raw_contacts表中获取联系人id
		Cursor cursor=getContentResolver().query(uri, new String[]{"contact_id"}, null, null, null);
	    while(cursor.moveToNext()){
	    	String id=cursor.getString(0);
	    	//依据获得的联系人id查询data表里的内容
	    	Cursor dataCursor=getContentResolver().query(datauri, new String[]{"data1","mimetype"}, "raw_contact_id=?", new String[]{id}, null);
	    	while(dataCursor.moveToNext()){
	    		System.out.println(dataCursor.getString(0)+"  ：     "+dataCursor.getString(1));
	    	}
	    	dataCursor.close();
	    	System.out.println("=======================");
	    }
	    cursor.close();
	}
}

附加：ContactsProvider项目清单文件内容能够查看URI和利用该内容提供者必须设置的权限：

        <provider android:name="ContactsProvider2"
            android:authorities="contacts;com.android.contacts"
            android:label="@string/provider_label"
            android:multiprocess="false"
            android:readPermission="android.permission.READ_CONTACTS"
            android:writePermission="android.permission.WRITE_CONTACTS">
            <path-permission
                    android:pathPrefix="/search_suggest_query"
                    android:readPermission="android.permission.GLOBAL_SEARCH" />
            <path-permission
                    android:pathPrefix="/search_suggest_shortcut"
                    android:readPermission="android.permission.GLOBAL_SEARCH" />
            <path-permission
                    android:pathPattern="/contacts/.*/photo"
                    android:readPermission="android.permission.GLOBAL_SEARCH" />
            <grant-uri-permission android:pathPattern=".*" />
        </provider>

ContactsProvider2.java中数据库表名的定义：

static {
        // Contacts URI matching table
        final UriMatcher matcher = sUriMatcher;
        matcher.addURI(ContactsContract.AUTHORITY, "contacts", CONTACTS);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/#", CONTACTS_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/#/data", CONTACTS_DATA);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/#/suggestions",
                AGGREGATION_SUGGESTIONS);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/#/suggestions/*",
                AGGREGATION_SUGGESTIONS);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/#/photo", CONTACTS_PHOTO);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/filter/*", CONTACTS_FILTER);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/lookup/*", CONTACTS_LOOKUP);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/lookup/*/#", CONTACTS_LOOKUP_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/as_vcard/*", CONTACTS_AS_VCARD);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/as_multi_vcard/*",
                CONTACTS_AS_MULTI_VCARD);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/strequent/", CONTACTS_STREQUENT);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/strequent/filter/*",
                CONTACTS_STREQUENT_FILTER);
        matcher.addURI(ContactsContract.AUTHORITY, "contacts/group/*", CONTACTS_GROUP);

        matcher.addURI(ContactsContract.AUTHORITY, "raw_contacts", RAW_CONTACTS);
        matcher.addURI(ContactsContract.AUTHORITY, "raw_contacts/#", RAW_CONTACTS_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "raw_contacts/#/data", RAW_CONTACTS_DATA);
        matcher.addURI(ContactsContract.AUTHORITY, "raw_contacts/#/entity", RAW_CONTACT_ENTITY_ID);

        matcher.addURI(ContactsContract.AUTHORITY, "raw_contact_entities", RAW_CONTACT_ENTITIES);

        matcher.addURI(ContactsContract.AUTHORITY, "data", DATA);
        matcher.addURI(ContactsContract.AUTHORITY, "data/#", DATA_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "data/phones", PHONES);
        matcher.addURI(ContactsContract.AUTHORITY, "data/phones/#", PHONES_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "data/phones/filter", PHONES_FILTER);
        matcher.addURI(ContactsContract.AUTHORITY, "data/phones/filter/*", PHONES_FILTER);
        matcher.addURI(ContactsContract.AUTHORITY, "data/emails", EMAILS);
        matcher.addURI(ContactsContract.AUTHORITY, "data/emails/#", EMAILS_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "data/emails/lookup/*", EMAILS_LOOKUP);
        matcher.addURI(ContactsContract.AUTHORITY, "data/emails/filter", EMAILS_FILTER);
        matcher.addURI(ContactsContract.AUTHORITY, "data/emails/filter/*", EMAILS_FILTER);
        matcher.addURI(ContactsContract.AUTHORITY, "data/postals", POSTALS);
        matcher.addURI(ContactsContract.AUTHORITY, "data/postals/#", POSTALS_ID);

        matcher.addURI(ContactsContract.AUTHORITY, "groups", GROUPS);
        matcher.addURI(ContactsContract.AUTHORITY, "groups/#", GROUPS_ID);
        matcher.addURI(ContactsContract.AUTHORITY, "groups_summary", GROUPS_SUMMARY);
}