Question

我被困在一个Android Spinner上几个小时，我无法找到我的方式做错了。

我已经设置了onItemSelectedListener方法，但它在我的活动启动时触发，并且单击列表中的项目的事实不会改变任何内容。这是代码：

Spinner的自定义适配器：

public class spinnerUrgenceAdapter extends ArrayAdapter {

ArrayList<UrgenceSpin> list;
    Context ctx;

    public spinnerUrgenceAdapter(Context context, ArrayList<UrgenceSpin> list) {
        super(context, 0, list);
        this.list = list;
        this.ctx=context;
    }

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        return customView(position, convertView, parent);
    }
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public View getDropDownView(int position, View convertView,ViewGroup parent) {
        return customView(position, convertView, parent);
    }

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    public View customView(int position, View convertView, ViewGroup parent){

        UrgenceSpin us = (UrgenceSpin) getItem(position);

        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.custom_spinner, parent, false);
        }

        Button cercle = (Button) convertView.findViewById(R.id.urgenceDSpin);
        TextView nom = (TextView) convertView.findViewById(R.id.urgenceLSpin);

        cercle.setBackground(ctx.getResources().getDrawable(us.getIdDrawable()));
        nom.setText(us.getNomUrgence());

        return convertView;
    }

我创建它并实现监听器的方式：

final int[] urgencesDr = {R.drawable.no_urgence, R.drawable.faible_urgence, R.drawable.moyenne_urgence, R.drawable.pressant_urgence, R.drawable.urgent_urgence};
        final String[] urgencesLa = {"Pas d'urgence", "Urgence très faible" , "Peu urgent", "Pressant", "Urgent"};

        ArrayList<UrgenceSpin> urgsp = new ArrayList<>();

        for(int i=0; i<5; i++){
            urgsp.add(new UrgenceSpin(urgencesDr[i], urgencesLa[i]));
        }

        Spinner spin = (Spinner) findViewById(R.id.urgencespin);
        spinnerUrgenceAdapter sua = new spinnerUrgenceAdapter(CreationSav.this, urgsp);
        spin.setAdapter(sua);


        spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                Button urgenceD = (Button) view.findViewById(R.id.urgenceDSpin);
                TextView urgenceL = (TextView) view.findViewById(R.id.urgenceLSpin);
                Toast.makeText(CreationSav.this, " yolo "+position, Toast.LENGTH_LONG).show();
                /*
                UrgenceSpin current = new UrgenceSpin(urgencesDr[position], urgencesLa[position]);
                urgenceD.setBackground(CreationSav.this.getResources().getDrawable(current.getIdDrawable()));
                urgenceL.setText(current.getNomUrgence());
                */
                }          


            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

您可以注意到，我的最终目标是更改按钮和textView（最后的屏幕截图）和适配器的XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="6dp"
        android:layout_marginBottom="6dp">

    <Button
        android:layout_gravity="center_vertical"
        android:layout_width="13dp"
        android:layout_height="13dp"
        android:layout_marginRight="8dp"
        android:id="@+id/urgenceDSpin"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:id="@+id/urgenceLSpin"/>

    </LinearLayout>

</LinearLayout>

因为您可以注意到屏幕截图，当我点击我的微调器时会出现Row，但是单击其中一个项目不会执行任何操作。当我的活动开始时，我得到了我的祝酒词：Yolo 0

我的方式出了什么问题，如果我做得对，你能解释一下吗？我只是试着遵循基础，但它只是不起作用......而且，是否可以做我正在尝试做的事情（用所选元素替换微调器中的当前元素）

Answer 1

试试这个

    int  selectionCurrent = spinner.getSelectedItemPosition();
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {


        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
            if (selectionCurrent != i) {
       }
       selectionCurrent = i;


    }

Spinner在错误的时间触发

1 个答案: