使用Handler Android [英] Use of Handler Android

问题描述

哪种是使用处理程序的更好方法.任何优势.我遇到的所有示例似乎都提供了内联版本.

在类中使用实现Handler.Callback并实现接口方法.

或

使用内联代码版本

private Handler mHandler = new Handler(){ ....};

解决方案

常用术语或这些内联类定义是匿名类.

您可以在 Java/Android:匿名本地类与命名类

基本上，主要区别在于可读性，编码速度，重用性和范围.

从资源的角度来看，匿名类的创建可能会导致垃圾收集器的开销，如 解决方案

The common term or these inline class definitions is Anonymous Classes.

You can read more about the discussion on these in Java/Android: anonymous local classes vs named classes

Essentially the main differences are readbility, speed of coding, re-use and scope.

From a resource point of view the anonymous class creation may cause an overhead in the garbage collector as discussed in Avoid Creating Unnecessary Objects. I am not certain on the exact details of anonymous class creation, however, it is logical that implementing the interface on the class is more efficient.

@WilliamTMallard has provided an example of what NOT to do. In his example, a long and syntacticly complex handler should be implementented on the class rather than anonymous handler because it is harder to read and edit when defined inline.

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