Set text of spinner before item is selected

问题:

I have a spinner with three items and I use an XML string-array resource to feed it. When you open an activity the spinner normally shows the first item that's in the array list. I'd like to change that and show the text "Select one" in the spinner, before an item is selected.

How can I do that?

回答1:

You can do that one of two ways.

1) Add "Select One" as the first item in your xml and code your listener to ignore that as a selection.

2) Create a custom adapter to insert it as the first line,

EDIT

In your resources

<string-array name="listarray">
    <item>Select One</item>
    <item>Item One</item>
    <item>Item Two</item>
    <item>Item Three</item>
</string-array>

In your onItemSelected Listener:

spinnername.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
    public void onNothingSelected(AdapterView<?> parent) {
    }
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        if (pos == 0) {
        }else {
            // Your code to process the selection
        }
    }
});

回答2:

To set a default text for the spinner you have to use android:prompt=@string/SelectOne for your spinner Where SelectOne is defined in your string.xml .

Example :

<Spinner android:id="@+id/spinnerTest"  
 android:layout_marginLeft="50px"
 android:layout_width="fill_parent"                  
 android:drawSelectorOnTop="true"
 android:layout_marginTop="5dip"
 android:prompt="@string/SelectOne"
 android:layout_marginRight="30px"
 android:layout_height="35px" 
/>