android中注解的简单实用

利用注解 实现findViewByID
//这是注解类

在这个注解类中我们声明了两个注解

1、@Target

/**
* Class, interface or enum declaration.
*/
TYPE
/**
* Field declaration.
*/
FIELD,
/**
* Method declaration.
*/
METHOD,
/**
* Parameter declaration.
*/
PARAMETER,
/**
* Constructor declaration.
*/
CONSTRUCTOR,
/**
* Local variable declaration.
*/
LOCAL_VARIABLE,
/**
* Annotation type declaration.
*/
ANNOTATION_TYPE,
/**
* Package declaration.
*/
PACKAGE

</pre><pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Menlo';font-size:15.0pt;"><span style="color:#bbb529;">@Target</span>(ElementType.<span style="color:#9876aa;"><em>FIELD</em></span>)
<span style="color:#bbb529;">@Retention</span>(RetentionPolicy.<span style="color:#9876aa;"><em>RUNTIME</em></span>)
<span style="color:#cc7832;">public </span>@<span style="color:#cc7832;">interface </span><span style="color:#bbb529;">ViewInject </span>{

<span style="color:#cc7832;">int </span><span style="color:#ffc66d;">value</span>() <span style="color:#cc7832;">default </span><span style="color:#6897bb;">0</span><span style="color:#cc7832;">;
</span>}