android - 根据第一个 Spinner 的选择，第二个 Spinner 没有收到正确的信息

Question

我知道已经有大约一百万个主题，但请听我说完。

标题说明了一切，当我在微调器 1 中选择一个项目时，微调器 2 会获得一个特定的选项列表供您选择(然后将用于显示信息)。它本质上是一本小型通讯录。

*更新**一切都已修复并正常工作，特别感谢用户 FishTruck 的帮助(即使其正常工作!)

package com.your.package.name;

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.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class Contact extends Activity{

        public Spinner spinner1, spinner2;
        public Button btnSubmit;//not needed yet

        @Override
        public void onCreate(Bundle savedInstanceState){
                super.onCreate(savedInstanceState);

                setContentView(R.layout.contact);
                findViews();
                addItemsOnSpinner1();
                addItemsOnSpinner2(0);
        }

        private void findViews(){
                spinner1 = (Spinner) findViewById(R.id.spinner1);
                spinner2 = (Spinner) findViewById(R.id.spinner2);
        }

        private void addItemsOnSpinner1() {
                List<String> list = new ArrayList<String>();

                list.add("Please Select");
                list.add("Choice 1");
                list.add("choice 2");

                ArrayAdapter<String> name = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);  

                name.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

                spinner1.setAdapter(name);
                spinner1.setOnItemSelectedListener(new OnItemSelectedListener(){
                        @Override
                        public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {
                                if(arg2>0)
                                addItemsOnSpinner2(arg2);
                        }
                        @Override
                        public void onNothingSelected(AdapterView<?> arg0) {
                                addItemsOnSpinner2(0);
                        }}
                );
        }

        private void addItemsOnSpinner2(int selectedIndex) {

                int positionTop = selectedIndex;

                if(positionTop==0){
                        List<String> list = new ArrayList<String>();
                        list.add("Please Select");
                        ArrayAdapter<String> name0 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);
                        name0.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        spinner2.setAdapter(name0);
                }else if(positionTop==1){
                        List<String> list1 = new ArrayList<String>();
                        list1.add("Please Select");
                        list1.add("item 1");
                        list1.add("item 2");
                        ArrayAdapter<String> name1 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list1);
                        name1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        spinner2.setAdapter(name1);
                }else if(positionTop==2){
                        List<String> list2 = new ArrayList<String>();
                        list2.add("Please Select");
                        list2.add("item 3");
                        list2.add("item 4");
                        ArrayAdapter<String> name2 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list2);
                        name2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        spinner2.setAdapter(name2);
                }
        }

}

希望这对您有所帮助!

Answer 1

当第一个微调项被选中时，您需要调用 addItemsOnSpinner2() 函数。

public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) {
addItemsOnSpinner2();}