android 30 下拉列表框：ArrayAdapter和Spinner.-白红宇

android 30 下拉列表框：ArrayAdapter和Spinner.

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发布时间：2019-06-13

本文共 3717 字，大约阅读时间需要 12 分钟。

package com.sxt.day05_04;import android.os.Bundle;import android.app.Activity;import android.content.res.Resources;import android.view.Menu;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 implements OnItemSelectedListener{    Spinner mspinYear,mspinMonth;    ArrayAdapter
     
       mAdapterYear,mAdapterMonth;    String[] mYears,mMonths,mDays;    int mYear=2000;//初始年份    int mMonth=1;//初始月份        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        initView();    }    private void initView() {        mspinYear=(Spinner) findViewById(R.id.spinYear);        //给mspinYear创建一个适配器，R.array.years是要加入进去的字符串数组资源，android.R.layout.simple_list_item_1是显示的列表项        mAdapterYear=ArrayAdapter.createFromResource(this, R.array.years, android.R.layout.simple_list_item_1);        //设置适配器        mspinYear.setAdapter(mAdapterYear);        mspinYear.setOnItemSelectedListener(this);                    }    private void initData() {        Resources res = getResources();//获取资源中定义的数组        mYears=res.getStringArray(R.array.years);        mMonths=res.getStringArray(R.array.months);        mDays=res.getStringArray(R.array.days);    }    @Override    //parent是Spinner，view是点击的某一项，    public void onItemSelected(AdapterView
       parent, View view, int position,            long id) {        switch (parent.getId()) {        case R.id.spinYear:            mYear=Integer.parseInt(mYears[position]);            if(mMonth==2&&(mYear%400==0 || mYear%4==0 && mYear%100!=0)){                Toast.makeText(MainActivity.this, mDays[0]+"天", 2000).show();            }else{                Toast.makeText(MainActivity.this, mDays[mMonth], 2000).show();            }            break;        case R.id.spinMonth:                        break;        }    }    @Override    public void onNothingSelected(AdapterView
       parent) {        // TODO Auto-generated method stub            }}


         
          
                   下拉之后以dialog对话框显示      
          
                   下拉之后以dialog对话框显示


     
         
      
       Day05_04-ArrayAdapterAndSpinnerDemo
          
      
       Settings
          
      
       选择年份
          
      
       选择月份
          
              
       
        2000
               
       
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