在Java中使用反射调用Singleton类中的方法

Question

I have a following class:

Public class ABCinfo { 
    private static ABCinfo instance = null;
    Public static ABCinfo getInstance(Param param); // get instance
    Private ABCinfo(Param); // making a Singleton class
    Public void methodA(Param1 param1); // need to invoke this method
}

using reflection in java, how can i invoke the methodA() . Basically I am writing an Android Application, i want to use method in already existing(assume it will be present all the time) application which is in the phone.

Below are the things I have tried:

String apkName = activity.getPackageManager().getApplicationInfo(packageName, 0).sourceDir;

PathClassLoader myPathClassLoader =
    new dalvik.system.PathClassLoader(
    apkName,
    ClassLoader.getSystemClassLoader());

Class<?> handler = Class.forName(className, true, myPathClassLoader);
Method m0 = handler.getDeclaredMethod("getInstance", new Class[] { Param.class  });
m0.setAccessible(true);
Object b = m0.invoke(null, new Object[]{ Param});
Method m = handler.getMethod("methodA", new Class[] { Param1.class});
Param1 methodParameter = "asdf";
Object b1 = m.invoke(b, new Object[] { methodParameter });

But its still not working.

Answer 1

我在下面找到了解决方案及其类似内容

Object b1 = m.invoke(handler.newInstance(), new Object[] { methodParameter });