Android通讯录查询问题，求大神解答，感激~

Question

为什么我查不到 log日志也打不出来

ContentResolver contentResolver = getContentResolver();

                Uri uri = Uri.parse("content://com.android.contacts/raw_contacts"); //访问raw_contacts表
                //2.查询系统联系人数据库
                Cursor cursor = contentResolver.query(
                        uri,
                        new String[]{"contact_id"},
                        null,null,null);
                //3.循环游标
                while (cursor.moveToNext()){
                    String id = cursor.getString(0);
                    Log.i(tag,"id="+id);
                }
                cursor.close(); 

Answer 1

cursor没查到值