Android中Spinner控件之鍵值對用法實例分析

2020-04-11 11:25:40

字體：大中小

來源：轉載

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本文實例講述了Android中Spinner控件之鍵值對用法。分享給大家供大家參考。具體如下：

一、字典表，用來存放鍵值對信息

package com.ljq.activity;import java.io.Serializable;@SuppressWarnings("serial")public class Dict implements Serializable { private Integer id; private String text; public Dict() { } public Dict(Integer id, String text) {  super();  this.id = id;  this.text = text; } public Integer getId() {  return id; } public void setId(Integer id) {  this.id = id; } public String getText() {  return text; } public void setText(String text) {  this.text = text; } /**  * 為什么要重寫toString()呢？  *   * 因為適配器在顯示數據的時候，如果傳入適配器的對象不是字符串的情況下，直接就使用對象.toString()  */ @Override public String toString() {  return text; }}

二、activity類，綁定數據、獲取選中的鍵值對

package com.ljq.activity;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.Toast;import android.widget.AdapterView.OnItemSelectedListener;public class MainActivity extends Activity { private Spinner mySpinner; @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.main);  mySpinner = (Spinner) findViewById(R.id.mySpinner);  List<Dict> dicts = new ArrayList<Dict>();  dicts.add(new Dict(1, "測試1"));  dicts.add(new Dict(2, "測試2"));  dicts.add(new Dict(3, "測試3"));  dicts.add(new Dict(4, "測試4"));  ArrayAdapter<Dict> adapter = new ArrayAdapter<Dict>(this,    android.R.layout.simple_spinner_item, dicts);  mySpinner.setAdapter(adapter);  mySpinner.setOnItemSelectedListener(new OnItemSelectedListener(){   public void onItemSelected(AdapterView<?> parent, View view,     int position, long id) {    // 獲取鍵的方法：mySpinner.getSelectedItem().toString()或((Dict)mySpinner.getSelectedItem()).getId()    // 獲取值的方法：((Dict)mySpinner.getSelectedItem()).getText();    Toast.makeText(MainActivity.this,      "鍵:" + mySpinner.getSelectedItem().toString() + "、" + ((Dict) mySpinner.getSelectedItem()).getId() +       "，值:" + ((Dict) mySpinner.getSelectedItem()).getText(),      Toast.LENGTH_LONG).show();   }   public void onNothingSelected(AdapterView<?> parent) {   }  }); }}

三、修改main.xml布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Spinner android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/mySpinner"/></LinearLayout>

四、運行結果如下：