jOOR
--摘自《android插件化开发指南》
1.jOOR库就一个Reflect.java类很重要
2.Reflect.java包括6个核心方法
1)on:包裹一个类或者对象,表示在这个类或对象上进行反射
2)create:用来调用之前的类的构造方法
3)call:方法调用
4)get:获取(field和method返回)值
5)set:设置属性值
No1:
根据字符串获取一个类
import static com.example.reflectiontest.Reflect.on; Reflect r1 = on(Object.class); Reflect r2 = on("java.lang.Object"); Reflect r3 = on("java.lang.Object",ClassLoader.getSystemClassLoader()); Object o1 = on(Object.class).<Object>get(); Object o2 = on("java.lang.Object").get(); String j2 = on((Object)"abc").get(); int j3 = on(1).get(); System.out.println(r1.toString()); System.out.println(r2.toString()); System.out.println(r3.toString()); System.out.println(o1.toString()); System.out.println(o2.toString()); System.out.println(j2.toString()); System.out.println(j3); ---------------------- class java.lang.Object class java.lang.Object class java.lang.Object class java.lang.Object class java.lang.Object abc 1
No2:
调用类的构造函数
public class TestClassCtor { private static String name; public TestClassCtor() { name = "baobao"; } public TestClassCtor(int a) { } public TestClassCtor(int a, String b) { name = b; } private TestClassCtor(int a, double c) { } @Override public String toString() { return name; } public static String getName() { return name; } }
TestClassCtor r = new TestClassCtor(); Class temp = r.getClass(); String className = temp.getName(); System.out.println(className); //public构造函数 Object obj = on(temp).create().get();//无参 Object obj2 = on(temp).create(1, "abc").get();//有参 System.out.println("obj:" + obj.toString()); System.out.println("obj2:" + obj2.toString()); //private构造函数 TestClassCtor obj3 = on(TestClassCtor.class).create(1, 1.1).get(); String a = obj3.getName(); System.out.println("a:" + a); ---------------- com.example.reflectiontest.TestClassCtor obj:abc obj2:abc a:abc
No3:
调用类的私有方法
public class TestClassCtor { private static String name; public TestClassCtor() { name = "baobao"; } public TestClassCtor(int a) { } public TestClassCtor(int a, String b) { name = b; } private TestClassCtor(int a, double c) { } private String doSomething(String d) { System.out.println("TestClassCtor,doSomething"); return "123" + d; } }
TestClassCtor r = new TestClassCtor(); Class temp = r.getClass(); Reflect reflect = on(temp).create(); String a1 = reflect.call("doSomething", "param1").get(); System.out.println(a1); ------------------ TestClassCtor,doSomething 123param1
No4:
调用类的私有静态方法
public class TestClassCtor { private static String name; public TestClassCtor() { name = "baobao"; } public TestClassCtor(int a) { } public TestClassCtor(int a, String b) { name = b; } private TestClassCtor(int a, double c) { } private static void work() { System.out.println("TestClassCtor,work"); } }
TestClassCtor r = new TestClassCtor(); Class temp = r.getClass(); Reflect reflect = on(temp).create(); on(TestClassCtor.class).call("work").get(); ------------------- TestClassCtor,work
No5:
修改类的私有实例字段
public class TestClassCtor { private String name; public TestClassCtor() { name = "baobao"; } public TestClassCtor(int a) { } public TestClassCtor(int a, String b) { name = b; } private TestClassCtor(int a, double c) { } }
Reflect obj = on("com.example.reflectiontest.TestClassCtor").create(1, 1.1); obj.set("name", "jianqiang"); Object obj1 = obj.get("name"); System.out.println(obj1.toString()); ---------------------- jianqiang
No6:
修改类的私有静态字段
public class TestClassCtor { private String name; private static String address; public TestClassCtor() { name = "baobao"; } public TestClassCtor(int a) { } public TestClassCtor(int a, String b) { name = b; } private TestClassCtor(int a, double c) { } }
on("com.example.reflectiontest.TestClassCtor").set("address","avccccc"); Object obj2 = on("com.example.reflectiontest.TestClassCtor").get("address"); System.out.println(obj2.toString()); ------------------ avccccc
问题:为什么jOOR不支持final字段
因为jOOR的Reflect的set方法会在遇到final时,尝试反射出Field类的modifiers字段,在Java环境下是有这个字段的,但是Android版本的Field并没有这个字段,于是就报错NoSuchFeildException