Java 在 Android Spinner 中设置值和显示文本
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Setting values and display Text in Android Spinner
提问by kaibuki
I need help in setting up value and display text in spinner. as per now I am populating my spinner by array adapter e.g
我需要在微调器中设置值和显示文本方面的帮助。现在我正在通过阵列适配器填充我的微调器，例如
mySpinner.setAdapter(myAdapter);
and as far as I know after doing this the display text and the value of spinner at same position is same. The other attribute that I can get from spinner is the position on the item.
据我所知，在执行此操作后，同一位置的显示文本和微调器的值是相同的。我可以从微调器获得的另一个属性是项目上的位置。
now in my case I want to make spinner like the drop down box, which we have in .NET.
现在在我的情况下，我想让 Spinner 像下拉框一样，我们在 .NET 中有。
which holds a text and value.
其中包含文本和值。
where as text is displayed and value is at back end. so if I change drop down box , I can either use its selected text or value. but its not happening in android spinner case.
其中显示文本，值在后端。因此，如果我更改下拉框，则可以使用其选定的文本或值。但它不会发生在 android spinner 案例中。
For Example:
例如：
Text Value
Cat 10
Mountain 5
Stone 9
Fish 14
River 13
Loin 17
文本值
猫 10
山 5
石头 9
鱼 14
河 13
腰 17
so from above array I am only displaying non-living objects text, and what i want is that when user select them I get there value i.e. like when Mountain selected i get 5
所以从上面的阵列中，我只是显示非活着的对象文本，以及我想要的是，当用户选择它们时，我会得到那么有价值，即当山上选择时，我得到5
I hope this example made my question a bit more clear...
我希望这个例子能让我的问题更清楚一点......
thankx
谢谢
采纳答案by CommonsWare
Step #1: Create a data model for your text and value pair
第 1 步：为文本和值对创建数据模型
Step #2: Extend BaseAdapteror ArrayAdapterto wrap around your data model, overriding getView()to return whatever you want to display in the Spinneritself
第 2 步：扩展BaseAdapter或ArrayAdapter环绕您的数据模型，覆盖getView()以返回您想要在其Spinner自身中显示的任何内容
Step #3: On a selection event, use the position to find the corresponding object in your data model, and look up the value
步骤 #3：在选择事件上，使用位置在数据模型中找到相应的对象，并查找值
If all you want to display in the Spinneris just a text representation of each element in the data model, you can skip the custom Adapter-- just use ArrayAdapter<YourModelClass>and override toString()on YourModelClassto return whatever display text you want.
如果你想在显示Spinner只是在数据模型中的每个元素的文本表示，可以跳过自定义Adapter-只要使用ArrayAdapter<YourModelClass>，并覆盖toString()上YourModelClass任何你想要显示文本的回报。
回答by alun
If you dont want to go through creating your own adapter-class you can instead wrap you data up in something that has toString returning what you want to show in the spinner. I use a class like this:
如果您不想创建自己的适配器类，则可以将数据包装在具有 toString 的内容中，返回您想要在微调器中显示的内容。我使用这样的类：
public class TextItemPair<T> {
private String text;
private T item;
public TextItemPair(String text, T item) {
this.text = text;
this.item = item;
}
public String getText() {
return text;
}
public T getItem() {
return item;
}
@Override
public String toString() {
return getText();
}
}
And when the spinner changes:
当微调器改变时：
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
YourTypeHere t = ((TextItemPair<YourTypeHere>)spinner.getItemAtPosition(position)).getItem();
}
