The difference between LayoutInflater.inflate and findViewById

理解Android布局中TableRow引用方式的区别

原创于 2015-09-12 09:30:51 发布 · 489 阅读

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本文深入探讨了在Android应用开发中使用TableRow时，两种不同引用方式的区别：通过findViewById()获取已创建并初始化的视图实例，与通过LayoutInflater.from()进行视图的创建与加载。特别关注了当TableRow作为布局的根节点或其内部组件时，这两种方法的差异与应用场景。

What is the difference between getting a reference to a widget like this:

TableRow row = findViewById(R.id.table_row);

and:

TableRow row = (TableRow)LayoutInflater.from(this).inflate(R.layout.table_row, null);

Is there also a difference when the TableRow is a root of its layout or if its just a small part of a layout?

1) Using

TableRow row = findViewById(R.id.table_row);

you are simply obtaining a reference to a View with id R.id.table_row which has already been created and inflated in the current layout (where current means the Activtiy's layout or the Viewthat you are defining).

2) Using

TableRow row = (TableRow)LayoutInflater.from(this).inflate(R.layout.table_row, null);

You are inflating (which means creating) a new views hierarchy based on the XML definition contained in R.layout.table_row. Since you are not passing the parent View parameter in the inflate()method, you will need to add the resulting hierarchy manually to an existent container.