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Android之Spinner用法，key/value模式

发布时间 2023-08-08 15:09:39作者: 邢帅杰
1.key、value类，需要重写toString()方法，返回text就是Spinner要显示的key
package com.jay.common;
public class SpinnerData {

    private String value = "";
    private String text = "";

    public SpinnerData() {
        value = "";
        text = "";
    }

    public SpinnerData(String _value, String _text) {
        value = _value;
        text = _text;
    }

    @Override
    public String toString() {
        return text;
    }

    public String getValue() {
        return value;
    }

    public String getText() {
        return text;
    }
}

2.设置适配器，默认选中项：spinner.setSelection(1);要放到最后一行。

Spinner spinner = (Spinner) findViewById(R.id.cbo1);
        List<SpinnerData> lst = new ArrayList<SpinnerData>();
        for (int i = 0; i < 3; i++) {
            SpinnerData c = new SpinnerData("value"+i, "text" + i);
            lst.add(c);
        }
        ArrayAdapter<SpinnerData> Adapter = new ArrayAdapter<SpinnerData>(this,android.R.layout.simple_spinner_item, lst);
        Adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(Adapter);

3.获取当前选中项：((SpinnerData)spinner.getSelectedItem()).getValue();
4.设置选中事件

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                TextView view1 = (TextView) view;
                String k = view1.getText().toString();
                String v = lst.get(position).getValue();
                Toast.makeText(MainActivity.this, "text:" + k + ",\nvalue:" + v, Toast.LENGTH_SHORT).show();
            }

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

            }
        });

 5.可替换自定义列表、选中样式
item_select.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="45dp"
    android:background="@android:color/holo_blue_dark"
    android:textSize="14sp"
    android:textColor="@android:color/holo_red_light"
    android:gravity="center"
    />

item_dropdown.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="45dp"
    android:textColor="@android:color/black"
    android:textSize="14sp"
    android:gravity="center"/>