英文:
Show/hide objects in layout based on spinner value
问题
我创建了一个布局，顶部是一个带有两个选项的“Spinner”：相机和图库（显示为这个绿色的东西）。
当用户点击相机时，我希望它在下面打开一些其他对象，例如ImageView和按钮，就像这样：
当用户点击图库时，我希望它显示为这样：
我要提问的是如何在这两个布局之间切换？
据我了解，我可以使用：
setContentView(R.layout.activity_main);
Spinner spinner = findViewById(R.id.spinner);
if (spinner.getSelectedItem().toString().equals("相机")) {
setContentView(R.layout.camera);
} else {
setContentView(R.layout.gallery);
}
但是我怎么知道何时初始化这些对象？因为如果我尝试在内容为图库布局时使用：
Button button = findViewById(R.id.button1);
它找不到它并且会报错。
我知道我也可以将所有对象放在一个单独的布局中，并根据用户的选择来控制对象的可见性，但我想知道是否有一种更智能的方式来基于用户选择加载对象。
谢谢。
英文:
I created a layout that has at the top of it a Spinner with two options: Camera and Gallery (shown as this green thing).
When the user clicks on camera I had like it to open beneath the spinner few more objects such as ImageView and buttons like this:
When the user clicks on Gallery I had like it to show like this:
My question is how can I move between these two layouts?
From my understanding, I can use
setContentView( R.layout.activity_main );
Spinner spinner = findViewById( R.id.spinner);
if (spinner.getSelectedItem().toString().equals("camera")) {
setContentView( R.layout.camera);
} else { setContentView( R.layout.gallery); }
But how do I know when to initialize the objects? because if I will try to use
Button button = findViewById( R.id.button1);
when it has the content of the gallery layout it won't find it and I will get an error.
I know I can also place all of the objects in a single layout and play with the visibility of the objects but I was wondering if there is a smarter way to load objects based on user choice.
Thank you
答案1
得分: 0
有很多不同的方法可以做到这一点，我可能会为您的每个布局（相机和相册）单独创建一个Fragment。然后在主布局中，您可以在Spinner下方放置一个FrameLayout，并在选择Spinner中的项目时将相应的Fragment加载到该框架中。
英文:
There are many different ways to do this, I would probably make a separate Fragment for each of your layouts (camera and gallery). Then in the main layout, you can put a FrameLayout below the Spinner and load the appropriate Fragment into that frame when an item in your Spinner is selected.
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