在android中读取联系人信息的程序，包括读取联系人姓名、手机号码和邮箱

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.itcast.contacts"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
     <uses-library android:name="android.test.runner" />
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="8" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
    
     <instrumentation android:name="android.test.InstrumentationTestRunner"
     android:targetPackage="cn.itcast.contacts" android:label="Tests for My App" />
</manifest> 

/*
     * 读取联系人的信息
     */
    public void testReadAllContacts() {
        Cursor cursor = this.getContext().getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, 
                 null, null, null, null);
        int contactIdIndex = 0;
        int nameIndex = 0;
        
        if(cursor.getCount() > 0) {
            contactIdIndex = cursor.getColumnIndex(ContactsContract.Contacts._ID);
            nameIndex = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
        }
        while(cursor.moveToNext()) {
            String contactId = cursor.getString(contactIdIndex);
            String name = cursor.getString(nameIndex);
            Log.i(TAG, contactId);
            Log.i(TAG, name);
            
            /*
             * 查找该联系人的phone信息
             */
            Cursor phones = this.getContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
                    null, 
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactId, 
                    null, null);
            int phoneIndex = 0;
            if(phones.getCount() > 0) {
                phoneIndex = phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
            }
            while(phones.moveToNext()) {
                String phoneNumber = phones.getString(phoneIndex);
                Log.i(TAG, phoneNumber);
            }
            
            /*
             * 查找该联系人的email信息
             */
            Cursor emails = this.getContext().getContentResolver().query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, 
                    null, 
                    ContactsContract.CommonDataKinds.Email.CONTACT_ID + "=" + contactId, 
                    null, null);
            int emailIndex = 0;
            if(emails.getCount() > 0) {
                emailIndex = emails.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA);
            }
            while(emails.moveToNext()) {
                String email = emails.getString(emailIndex);
                Log.i(TAG, email);
            }
            
        }
    }

Cursor groupInfoCursor = getContentResolver().query(ContactsContract.Groups.CONTENT_URI, null, null, null, null);
while(groupInfoCursor.moveToNext()) {
    int idIndex = groupInfoCursor.getColumnIndex(ContactsContract.Groups._ID);
    int titleIndex = groupInfoCursor.getColumnIndex(ContactsContract.Groups.TITLE);
    String id = groupInfoCursor.getString(idIndex);
    String title = groupInfoCursor.getString(titleIndex);
}
groupInfoCursor.close();