Android实现院系专业三级联动

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package com.example.test;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.provider.MediaStore;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
 Spinner sp1,sp2,sp3;
 Button btn1;
 EditText edt1,edt2,edt3;
 RadioGroup rg1;
 CheckBox cb1,cb2,cb3;
 TextView id1,id2,id3;
 static int index;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 final String []college={"数学与统计学院","化学材料与工程","轻工科学技术学院","电商与物流学院","生态环境学院","计算机学院"};
 final String [][]depart=
  {
   {"公共数学系","应用统计系","经济统计系","数学与应用数学系"},
   {"化学系","材料科学与工程系","化妆品系"},
   {"应用化学系","生物工程系"},
   {"物流管理系","信息管理系"},
   {"环境科学与工程系"},
   {"计算机系"}
  };
 final String [][][]major=
  {
   {{"信息与计算科学"},{"应用统计学"},{"经济统计学"},{"数据科学与大数据技术"}},
   {{"化学技术与工程"},{"高分子材料与工程","功能材料"},{"化妆品技术与工程"}},
   {{"化学"},{"生物工程"}},
   {{"物流管理","供应链管理"},{"电子商务","信息管理与信息系统"}},
   {{"环境科学与工程"}},
   {{"计算机科学与技术","软件工程","物联网工程"}}
  };
 ArrayAdapter colAdapter=new ArrayAdapter(this,R.layout.support_simple_spinner_dropdown_item,college);
 ArrayAdapter depAdapter=new ArrayAdapter(this,R.layout.support_simple_spinner_dropdown_item,depart[0]);
 ArrayAdapter morAdapter=new ArrayAdapter(this,R.layout.support_simple_spinner_dropdown_item,major[0][0]);
 edt1=(EditText)findViewById(R.id.edt1);
 edt2=(EditText)findViewById(R.id.edt2);
 edt3=(EditText)findViewById(R.id.edt3);
 rg1=(RadioGroup) findViewById(R.id.rg1);
 cb1=(CheckBox)findViewById(R.id.cb1);
 cb2=(CheckBox)findViewById(R.id.cb2);
 cb3=(CheckBox)findViewById(R.id.cb3);
 sp1=(Spinner)findViewById(R.id.sp1);
 sp2=(Spinner)findViewById(R.id.sp2);
 sp3=(Spinner)findViewById(R.id.sp3);
 btn1=(Button)findViewById(R.id.btn1);
 id1=(TextView)findViewById(R.id.id1);
 id2=(TextView)findViewById(R.id.id2);
 id3=(TextView)findViewById(R.id.id3);
 sp1.setAdapter(colAdapter);
 sp1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
  @Override
  public void onItemSelected(AdapterView<&＃63;> parent, View view, int position, long id) {
  index=position;
  ArrayAdapter depAdapter=new ArrayAdapter(MainActivity.this,R.layout.support_simple_spinner_dropdown_item,depart[position]);
  sp2.setAdapter(depAdapter);
  }

  @Override
  public void onNothingSelected(AdapterView<&＃63;> parent) {

  }
 });
 sp2.setAdapter(depAdapter);
 sp2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
  @Override
  public void onItemSelected(AdapterView<&＃63;> parent, View view, int position, long id) {
  ArrayAdapter morAdapter=new ArrayAdapter(MainActivity.this,R.layout.support_simple_spinner_dropdown_item,major[index][position]);
  sp3.setAdapter(morAdapter);
  }

  @Override
  public void onNothingSelected(AdapterView<&＃63;> parent) {

  }
 });
 btn1.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  String likes=" ";
  String name=edt1.getText().toString();
  String password=edt2.getText().toString();
  String num=edt3.getText().toString();
  String str1="用户名："+name+"\n"+"密码："+password+"\n"+"学号："+num;
  String str2=" ";
  if(password.length()<8||password.length()>24)
  {
   Toast.makeText(MainActivity.this,"密码需8-24位",Toast.LENGTH_SHORT).show();
  }
  else{
   id1.setText(str1);
  }
  for(int i=0;i