android 获取联系人头像

    public byte[] getPersonPhoto(String PersonID)
    {
         String photo_id = null;
         String[] projection1 = new String[] {ContactsContract.Contacts.PHOTO_ID};
         String selection1 = ContactsContract.Contacts._ID+ " = " + PersonID;
         Cursor cur1 = cr.query(
             ContactsContract.Contacts.CONTENT_URI, projection1, selection1,
             null, null);

if (cur1.getCount() > 0) {
cur1.moveToFirst();
photo_id = cur1.getString(0);
}
String[] projection = new String[] {
ContactsContract.Data.DATA15
};

String selection = "ContactsContract.Data._ID = " + photo_id;

Cursor cur = cr.query(
ContactsContract.Data.CONTENT_URI, projection, selection, null,
null);
cur.moveToFirst();
if(cur.getCount()<0 || cur.getCount() == 0){
return null;
}
byte[] contactIcon = cur.getBlob(0);
if (contactIcon == null) {
return null;
} else {
return contactIcon;
}
}