当所选项目发生变化时,如何为微调器设置事件侦听器?

基本上我想做的是类似这样的事情:

spinner1.onSelectionChange = handleSelectionChange;

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

当前回答

https://stackoverflow.com/q/1714426/811625

你可以通过一个简单的检查来避免OnItemSelectedListener()被调用:将当前的选择索引存储在一个整数变量中,并在做任何事情之前在onItemSelected(..)中进行检查。

E.g:

Spinner spnLocale;

spnLocale = (Spinner)findViewById(R.id.spnLocale);

int iCurrentSelection = spnLocale.getSelectedItemPosition();

spnLocale.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { 
    if (iCurrentSelection != i){
            // Your code here
    }
    iCurrentSelection = i;
    } 

    public void onNothingSelected(AdapterView<?> adapterView) {
        return;
    } 
}); 

当然,iCurrentSelection应该在对象范围内,这样才能工作!

其他回答

spinner1.setOnItemSelectedListener(
    new AdapterView.OnItemSelectedListener() {
        //add some code here
    }
);

https://stackoverflow.com/q/1714426/811625

你可以通过一个简单的检查来避免OnItemSelectedListener()被调用:将当前的选择索引存储在一个整数变量中,并在做任何事情之前在onItemSelected(..)中进行检查。

E.g:

Spinner spnLocale;

spnLocale = (Spinner)findViewById(R.id.spnLocale);

int iCurrentSelection = spnLocale.getSelectedItemPosition();

spnLocale.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { 
    if (iCurrentSelection != i){
            // Your code here
    }
    iCurrentSelection = i;
    } 

    public void onNothingSelected(AdapterView<?> adapterView) {
        return;
    } 
}); 

当然,iCurrentSelection应该在对象范围内,这样才能工作!

我认为最好的方法是让flagitemselected = 0;在onCreate()。在itemselected event上增加标志,即flagitemselected++;然后检查

if(flagitemselected!=1)
{
// do your work here
}

我想这会有帮助。

Spinner spnLocale = (Spinner)findViewById(R.id.spnLocale);

spnLocale.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { 
        // Your code here
    } 

    public void onNothingSelected(AdapterView<?> adapterView) {
        return;
    } 
}); 

注意:记住一件事。

OnItemSelectedListener事件将执行两次:

旋转器初始化 手动选择的用户

试着用标志变量来区分这两者。

spinner-widget的文档说

旋转器不支持项目单击事件。

您应该使用setOnItemSelectedListener来处理您的问题。