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如何禁用按代码设置选定项时要调用的OnItemSelectedListener

spinner listener android

Zordid · 技术社区 · 15 年前

只是想知道如何处理以下问题:根据两个微调器的选定项计算结果。为了处理UI,即用户在其中一个微调器中选择一个新项,我使用 setOnItemSelectedListener 为我的旋转器 onCreate() 活动的方法。

现在:当然可以了。听者的工作是触发对结果的新计算。

问题是:因为我截获了 onPause() onResume() 为了保存/恢复最后的状态,我得到了一个方法集合这两个微调器的选定项以编程方式如下所示:

startSpinner.setSelection(pStart);
destSpinner.setSelection(pDest);

这两个调用也会调用侦听器!我的结果计算方法加上新结果集的通知在这里被调用两次!

一个愚蠢的直接方法是使用一个布尔变量停用无论监听器在内部做什么,在设置选定项之前设置它,然后重置它。可以。但是有更好的方法吗??

我不想让侦听器被代码操作调用,只由用户操作调用!:

你是怎么做到的? 谢谢!

11 回复 | 直到 15 年前

Community Mohan Dere 8 年前

Undesired onItemSelected calls

Andres Q. 11 年前

public class SpinnerInteractionListener implements AdapterView.OnItemSelectedListener, View.OnTouchListener {

    boolean userSelect = false;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        userSelect = true;
        return false;
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        if (userSelect) { 
            // Your selection handling code here
            userSelect = false;
        }
    }

}

SpinnerInteractionListener listener = new SpinnerInteractionListener();
mSpinnerView.setOnTouchListener(listener);
mSpinnerView.setOnItemSelectedListener(listener);

Zordid 15 年前

onCreate onResume

currentPos1 currentPos2
onItemSelectedListener() refreshMyResult()

int newPos1 = mySpinner1.getSelectedItemPosition();
int newPos2 = mySpinner2.getSelectedItemPosition();
// only do something if update is not done yet
if (newPos1 != currentPos1 || newPos2 != currentPos2) {
    currentPos1 = newPos1;
    currentPos2 = newPos2;

    // do whatever has to be done to update things!

}

dandan78 Tom Cool 7 年前

  Boolean check = false;

 holder.filters.setOnTouchListener(new View.OnTouchListener() {
               @Override
               public boolean onTouch(View v, MotionEvent event) {

                   check = true;
                   return false;
               }
           });

           holder.filters.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
           {

               @Override
               public void onItemSelected(AdapterView<?> parent, View arg1, int position, long id)
               {
                   flag = filterids.get(position);

                   if(check)
                   {
                       check = false;
                       new Applyfilters().execute(flag,"3");
                   }else{

                   }

               }

               @Override
               public void onNothingSelected(AdapterView<?> arg0)
               {
                   // TODO Auto-generated method stub
               }
           });

joe 12 年前

Spinner.setSelection(int position, boolean animate) false

Zordid 12 年前

a.black13 10 年前

spinner.setSelection(withAction,position);

https://github.com/scijoker/spinner2

Graeme Duncan 15 年前

OnItemSelectedListener onResume

Ivo Stoyanov 11 年前

private mIsSpinnerFirstCall=true;

...
Spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        //If a new value is selected (avoid activating on setSelection())
        if(!mIsSpinnerFirstCall) {
            // Your code goes gere
        }
        mIsSpinnerFirstCall = false;
    }

    public void onNothingSelected(AdapterView<?> arg0) {
    }
});

Burak 7 年前

boolean shouldWork = true;

Spinner spinner = findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView adapter, View v, int i, long lng) {
        if (shouldWork) {
               // Do your actions here
        }
        else
            shouldWork = true;
    }
    public void onNothingSelected(AdapterView<?> parentView)  {

    }
});

shouldWork = false;
spinner.setSelection(0);

Jaya 7 年前

    This following method will help you to stop invoking automatically the selection listener


    yourspinnerobj.post(new Runnable() {
                @Override
                public void run() {
                    yourspinnerobj.setOnItemSelectedListener(yourspinnerlistener);
                }
            });