Android SQLiteConstraintException: error code 19: constraint failed

悲剧的问题竟然是这样产生的。

// 创建通话记录表，用户id，通话对象id， String callTable = "CREATE TABLE IF NOT EXISTS '%s'" + "(userid VARCHAR, callwith VARCHAR, calltype VARCHAR, callstart time, callend time, callmedia VARCHAR" + ");";

// 创建通话记录表，用户id，通话对象id， String callTable = "CREATE TABLE IF NOT EXISTS '%s'" + "(userid VARCHAR not Null , callwith VARCHAR not null, calltype VARCHAR, callstart time, callend time, callmedia VARCHAR" + ");";