最近在看React-native，对内部实现很感兴趣，自己写了Module注册进去，并且在js中调用，很好奇自己的方法是怎么暴露给js的，看了BaseJavaModule的源码，里面有方法是如何暴露的。
@Override
public final Map<String, NativeMethod> getMethods() {
Map<String, NativeMethod> methods = new HashMap<String, NativeMethod>();
Method[] targetMethods = getClass().getDeclaredMethods();
for (int i = 0; i < targetMethods.length; i++) {
Method targetMethod = targetMethods[i];
//找有@ReactMethod注解的方法
if (targetMethod.getAnnotation(ReactMethod.class) != null) {
String methodName = targetMethod.getName();
if (methods.containsKey(methodName)) {
// We do not support method overloading since js sees a function as an object regardless
// of number of params.
throw new IllegalArgumentException(
"Java Module " + getName() + " method name already registered: " + methodName);
}
methods.put(methodName, new JavaMethod(targetMethod));
}
}
return methods;
}
React-native Android Java Module如何暴露自己的方法给js
原文：http://my.oschina.net/fengcunhan/blog/514966