是否可以从其他布局初始化视图? [英] Is it possible to initialize a View from different Layout?

问题描述

我有一个 Activity ，并与它关联了 layout .另外，我还有另一个 layout 和一些 Views .我想使用来自独立 layout 的 View 从我的 Activity 中初始化变量( TextView ).我总是得到 null .

I have an Activity and associated with it layout. Also I have another layout with some Views. I want to initialize a variable (TextView) from my Activity using a View from that standalone layout. I always get null.

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button) findViewById(R.id.button); // This is OK 
// because R.id.button is from R.layout.main layout

        tvOne = (TextView) findViewById(R.id.first_item); // This is not OK
// because R.id.first_item is from another layout.
}

推荐答案

这是正确的行为，因为 findViewById()仅搜索传递给 setContentView的视图层次结构中设置的视图()

This is the correct behaviour, because findViewById() will only search for views set in the view hierarchy passed to setContentView()

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