JAVA 反射

工具类：

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class RefInvoke {
    
    public static  Object invokeStaticMethod(String class_name, String method_name, Class[] pareTyple, Object[] pareVaules){
        
        try {
            Class obj_class = Class.forName(class_name);
            Method method = obj_class.getMethod(method_name,pareTyple);
            return method.invoke(null, pareVaules);
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
        
    }
    
    public static  Object invokeMethod(String class_name, String method_name, Object obj ,Class[] pareTyple, Object[] pareVaules){
        
        try {
            Class obj_class = Class.forName(class_name);
            Method method = obj_class.getMethod(method_name,pareTyple);
            return method.invoke(obj, pareVaules);
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
        
    }
    
    public static Object getFieldOjbect(String class_name,Object obj, String filedName){
        try {
            Class obj_class = Class.forName(class_name);
            Field field = obj_class.getDeclaredField(filedName);
            field.setAccessible(true);
            return field.get(obj);
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
        
    }
    
    public static Object getStaticFieldOjbect(String class_name, String filedName){
        
        try {
            Class obj_class = Class.forName(class_name);
            Field field = obj_class.getDeclaredField(filedName);
            field.setAccessible(true);
            return field.get(null);
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
        
    }
    
    public static void setFieldOjbect(String classname, String filedName, Object obj, Object filedVaule){
        try {
            Class obj_class = Class.forName(classname);
            Field field = obj_class.getDeclaredField(filedName);
            field.setAccessible(true);
            field.set(obj, filedVaule);
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }    
    }
    
    public static void setStaticOjbect(String class_name, String filedName, Object filedVaule){
        try {
            Class obj_class = Class.forName(class_name);
            Field field = obj_class.getDeclaredField(filedName);
            field.setAccessible(true);
            field.set(null, filedVaule);
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }

}

范例代码：

private String[] getClassNameList(int cookie) {
    return (String[]) RefInvoke.invokeStaticMethod("dalvik.system.DexFile",
        "getClassNameList", new Class[] { int.class },
        new Object[] { cookie });
}

private Class defineClass(String name, ClassLoader loader, int cookie) {
    return (Class) RefInvoke.invokeStaticMethod("dalvik.system.DexFile",
        "defineClass", new Class[] { String.class, ClassLoader.class,
        int.class }, new Object[] { name, loader, cookie });
}

@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
    Log.d(TAG, "findClass-" + name);
    Class<?> cls = null;

    String as[] = getClassNameList(cookie);
    for (int z = 0; z < as.length; z++) {
        if (as[z].equals(name)) {
            cls = defineClass(as[z].replace('.', '/'),
            mContext.getClassLoader(), cookie);
        } else {
            defineClass(as[z].replace('.', '/'), mContext.getClassLoader(),
            cookie);
        }
    }

    if (null == cls) {
        cls = super.findClass(name);
    }

    return cls;
    }