--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).
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.TestClassCtorobj:abcobj2:abca: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,doSomething123param1
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