调用底层不能直接访问的类和方法

比如：我想调用 “com.android.internal.policy.PolicyManager” 中的 “makeNewWindow”方法。

String POLICYMANAGER_CLASS_NAME = "com.android.internal.policy.PolicyManager";

try {

Class policyClass = Class.forName(POLICYMANAGER_CLASS_NAME);

Method makeNewWindow = policyClass.getMethod("makeNewWindow",

new Class[] { Context.class });