java - 将 String 转换为 Activity 类

Question

我正在尝试从一个字符串创建一个 Activity 类并将它传递给一个静态方法。我在 SO 上找到了将字符串传递给类的方法。 FirstActivity 已创建。

第二个 Activity

String myClass = "com.package.FirstActivity";
Class<?> myClass = Class.forName(myClass);
//this works
//Intent myIntent = new Intent(getApplicationContext(), myClass);
//I want to pass to a static method, but it gives a error. Class cannot cast to Activity
StaticMethod.processThis(myClass , "test");

静态方法

public static void processThis(Activity contextActivity, String str) {
     //do processing
}

如何让 processThis 工作？如果我没理解错的话，一个Activity也是一个类？

Answer 1

您需要创建一个新的 FirstActivity 实例。如果此类具有不带参数的构造函数，您可以执行以下操作:

String myClass = "com.package.FirstActivity";
Class<?> myClass = Class.forName(myClass);
Activity obj = (Activity) myClass.newInstance();
Intent myIntent = new Intent(getApplicationContext(), myClass); //Maybe here also obj must be needed

//Noe pass your object here
StaticMethod.processThis(obj, "test");