--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