Android 布局在运行时用另一个视图替换一个视图 [英] Android layout replacing a view with another view on run time

问题描述

我有一个 xml 布局文件 main，其中包含两个文本视图 A/B 和一个视图 C.我还有另外两个 xml 布局文件 option1 和 option2.是否可以在运行时通过 Java 将 option1 或 option2 加载到 C 中?如果是这样，我必须使用什么功能?

I have a xml-layout file main with two textviews A/B and a view C. I have two other xml-layout files option1 and option2. Is it possible to load either option1 or option2 in run time via Java into C? If so, what function do I have to use?

推荐答案

您可以随时替换任何视图.

You could replace any view at any time.

int optionId = someExpression ? R.layout.option1 : R.layout.option2;

View C = findViewById(R.id.C);
ViewGroup parent = (ViewGroup) C.getParent();
int index = parent.indexOfChild(C);
parent.removeView(C);
C = getLayoutInflater().inflate(optionId, parent, false);
parent.addView(C, index);

如果你不想替换已经存在的View，而是在初始化时选择option1/option2，那么你可以更容易地做到这一点:设置android:id对于父布局，然后:

If you don't want to replace already existing View, but choose between option1/option2 at initialization time, then you could do this easier: set android:id for parent layout and then:

ViewGroup parent = (ViewGroup) findViewById(R.id.parent);
View C = getLayoutInflater().inflate(optionId, parent, false);
parent.addView(C, index);

您必须根据视图结构将索引"设置为适当的值.您还可以使用 ViewStub:将 C 视图添加为 ViewStub，然后:

You will have to set "index" to proper value depending on views structure. You could also use a ViewStub: add your C view as ViewStub and then:

ViewStub C = (ViewStub) findViewById(R.id.C);
C.setLayoutResource(optionId);
C.inflate();

这样，如果您想重构 XML 布局，就不必担心上面的索引"值.

That way you won't have to worry about above "index" value if you will want to restructure your XML layout.

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