android--------解决Entities and POJOs must have a usable public constructor

     今天在学习android数据库,运行程序的时候报错,错误是:Entities and POJOs must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).Tried the following constructors but they failed to match:

Word(java.lang.String,java.lang.String) -> [param:english_word -> matched field:unmatched, param:chinese_meaning -> matched field:unmatched]。

   解决方法:在实体类写一个空的构造函数即可。

  因为我有一个有参的构造函数,于是我写了一个空的构造函数即可运行。

  android--------解决Entities and POJOs must have a usable public constructor_第1张图片

 

   写一个空的构造函数:

 

 

 

 

 

  运行成功:

 

  android--------解决Entities and POJOs must have a usable public constructor_第2张图片

 

 

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