就这么迷失了...ViewSwitcher？创建一个 Activity 然后添加到 ViewSwitcher 中？
我是 Android 新手，发现它很残酷（似乎有无数的细节和依赖项需要记住）。
无论如何，我让 TextSwitcher1 示例应用程序正常工作，它使用 ViewSwitcher。我假设 ViewSwitcher 是可行的方法，需要显示地图或表格，用户可以选择并来回切换。
所以我在另一个应用程序中创建了我的 MapActivity，似乎有效。接下来集成到主应用程序中。所以，打电话 视图 v = findViewById(R.layout.mapview); 进而 mSwitcher.addView(v); 除了“v”为空之外。为什么？我要创建活动吗？但我还不想展示它。是否有“创建活动但隐藏它直到需要时”之类的调用？还是我找错了树？
感谢您的任何见解。
I'm new to Android and find it brutal (there seems to be an near infinite number of details and dependencies to remember).
Anywho, I got the TextSwitcher1 example app working, which uses ViewSwitcher. I'm assuming ViewSwitcher is the way to go, need to either display a map or a table, user can pick, and switch back and forth.
So I created my MapActivity in another application, seems to work. Next integrate into main app. So, call
View v = findViewById(R.layout.mapview);
and then
mSwitcher.addView(v);
except "v" is null. Why? Do I create the activity? But I don't want to show it yet. Is there such a call as "create activity but hide it until needed"? Or am I barking up the wrong tree?
Thanks for any insight.
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findViewById函数根据您在 Activity 中加载的任何视图的 ID 资源 (R.id.something) 返回一个View（使用setContentView(R.layout.main))。在示例代码中，您使用布局资源 (R.layout.mapview)。您应该扩充 XML 文件，该文件将返回一个View，您可以使用它添加到ViewSwitcher。示例代码：
但是，您应该能够定义 XML 文件中的所有内容，而不必手动将页面添加到
ViewSwitcher中。以下是有关如何执行此操作的一些示例代码： http://inphamousdevelopment.wordpress.com/2010/10/11/using-a-viewswitcher-in-your-android-xml-layouts/The
findViewByIdfunction returns aViewbased on an ID resource (R.id.something) for whatever view you have loaded in your activity (usingsetContentView(R.layout.main)). In your sample code, you're using a layout resource (R.layout.mapview). You should inflate the XML file, which will return aViewthat you can use to add to theViewSwitcher.Example Code:
However, you should be able to define everything in your XML file and not have to manually add the pages to your
ViewSwitcher. Here's some example code on how to do that: http://inphamousdevelopment.wordpress.com/2010/10/11/using-a-viewswitcher-in-your-android-xml-layouts/