Android反射出一个类中的其他类对象并调用其对应方法

MainActivity如下:

package cn.testreflect;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import android.os.Bundle;

import android.app.Activity;

/**

 * Demo描述:

 * 在一个类中有另外一个类的对象

 * 比如此处的Worker类中有一个Student类的对象:

 * private Student mStudent;

 *

 * 目前需求:

 * 我们需要反射出Worker类中的 private Student mStudent

 * 并且使用该对象调用其对应的方法

 */

public class MainActivity extends Activity {

	private Field mStudentField;

	private Object mStudentObject;

	private Class mStudentClass;

	private Method mStudentShowMethod;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);

		init();

	}

    private void init(){

    	try {

    		String workerClassName="cn.testreflect.Worker";

        	Class workerClass=Class.forName(workerClassName);

        	//得到Worker类中的mStudent字段

        	mStudentField=workerClass.getDeclaredField("mStudent");

        	mStudentField.setAccessible(true);

        	//实例化mStudent对象

        	mStudentObject=mStudentField.get(new Worker());

        	//得到mStudent对象对应类的Class

        	mStudentClass = Class.forName(mStudentObject.getClass().getName());

        	//反射出该Class类中的show()方法

        	mStudentShowMethod = mStudentClass.getDeclaredMethod("show");

			//取消访问私有方法的合法性检查

        	mStudentShowMethod.setAccessible(true);

			//调用show()方法

        	mStudentShowMethod.invoke(mStudentObject);        	

		} catch (Exception e) {

			System.out.println(e.toString());

		}

    }

}

Worker如下:

package cn.testreflect;

public class Worker {

    private int age;

    private String name;

    private Student mStudent;

    public Worker() {

		super();

		mStudent=new Student("I am a student", 9527);

		System.out.println("---> public Worker(){ }");

	}

	public Worker(int age, String name) {

		super();

		this.age = age;

		this.name = name;

		mStudent=new Student("I am a student", 9527);

		System.out.println("---> public Worker(int age, String name){ }");

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		this.age = age;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	@Override

	public String toString() {

		return "Worker [age=" + age + ", name=" + name + "]";

	}

	public void printMessage(String name,int age,int salary){

		System.out.println("name="+name+",age="+age+",salary="+salary);

	}

}

Student如下:

package cn.testreflect;

public class Student {

	private String name;

	private int age;

	public Student() {

		super();

	}

	public Student(String name, int age) {

		super();

		this.name = name;

		this.age = age;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		this.age = age;

	}

	@Override

	public String toString() {

		return "Student [name=" + name + ", age=" + age + "]";

	}

	public void show(){

		System.out.println("-----> call method show()");

	}

}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Android中Java反射技术的使用"

        android:layout_centerInParent="true"/>

</RelativeLayout>

巴特西

Android反射出一个类中的其他类对象并调用其对应方法

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