Android Spinner:获取选中的项目改变事件 [英] Android Spinner: Get the selected item change event

问题描述

How can you set the event listener for a Spinner when the selected item changes?

How can you set the event listener for a Spinner when the selected item changes?

基本上我想做的事情与此类似:

Basically what I am trying to do is something similar to this:

spinner1.onSelectionChange = handleSelectionChange;

void handleSelectionChange(Object sender){
    //handle event
}

推荐答案

之前的一些答案不正确.它们适用于其他小部件和视图，但 Spinner 小部件 明确指出:

Some of the previous answers are not correct. They work for other widgets and views, but the documentation for the Spinner widget clearly states:

微调器不支持项目点击事件.调用这个方法会引发一个例外.

A spinner does not support item click events. Calling this method will raise an exception.

最好使用 OnItemSelectedListener() 代替:

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
        // your code here
    }

    @Override
    public void onNothingSelected(AdapterView<?> parentView) {
        // your code here
    }

});

这对我有用.

注意 onItemSelected 方法在构建视图时也会被调用，所以你可以考虑把它放在 onCreate() 方法调用中.

Note that onItemSelected method is also invoked when the view is being build, so you can consider putting it inside onCreate() method call.

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