Android(安卓)studio 安卓填写注册表单源代码（课后练习的答案）

activity_mian.xml

<?xml version="1.0" encoding="utf-8"?>

MainActivity.java
package com.example.registerpage;

import androidx.appcompat.app.AppCompatActivity;

import android.app.DatePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.ToggleButton;

import com.example.registerpage.R;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {
private EditText myName;
private EditText myPwd;
private EditText myRePwd;
private ToggleButton mySex;
private EditText myBirth;
private Spinner myDegree;
private CheckBox myAccept;
private Button mySubmit;
private int myYear, myMonth, myDay;
private String mydegreeTemp;

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    findViews();    //1.设置日期事件监听器    myBirth.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View view) {     // (1)单击日期框事件            DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this, DateListener, myYear, myMonth, myDay);                     // (1)创建DatePickerDialog对象，设置初始日期            datePickerDialog.show();      // (1)显示DatePickerDialog组件（即日期选择对话框）        }    });    //2.②设置学历下拉列表监听器    Spinner.OnItemSelectedListener listener = new Spinner.OnItemSelectedListener() {        @Override        public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {            mydegreeTemp = parent.getItemAtPosition(pos).toString();        }// (2)②将选择项字符串作为值        @Override        public void onNothingSelected(AdapterView<?> parent) {            mydegreeTemp = "未知";// (2)②没有选择值为未知        }    };    myDegree.setOnItemSelectedListener(listener);}private void findViews() {    myName = (EditText) findViewById(R.id.myEditName);    myPwd = (EditText) findViewById(R.id.myEditPwd);    myRePwd = (EditText) findViewById(R.id.myEditRePwd);    mySex = (ToggleButton) findViewById(R.id.myToggleButtonSex);    myBirth = (EditText) findViewById(R.id.myEditBirth);    myDegree = (Spinner) findViewById(R.id.mySpinnerDegree);    myAccept = (CheckBox) findViewById(R.id.myCheckBoxAccept);    mySubmit = (Button) findViewById(R.id.myButtonSubmit);    //初始化日历    Calendar calendar = Calendar.getInstance(Locale.CHINA);  // (2)①创建Calendar对象    Date date = new Date();                // (2)①获取当前日期Date对象    calendar.setTime(date);            // (2)①为Calendar对象设置为当前日期    myYear = calendar.get(Calendar.YEAR) - 20;       // (2)①获取Calendar对象中的年    myMonth = calendar.get(Calendar.MONTH);      // (2)①获取Calendar对象中的月    myDay = calendar.get(Calendar.DAY_OF_MONTH);  // (2)①获取Calendar对象中的日    myBirth.setText("点击这里选择...");    //2.②初始化学历    List list = new ArrayList();// (2)②创建字符串数组    list.add("博士");// (2)②向字符串数组加入元素    list.add("硕士");    list.add("学士");    ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, list);// (2)②创建字符串数组适配器    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);   //2.②    myDegree.setAdapter(adapter);// (2)②将字符串数组适配器与学历控件联系起来}// (1) 监听日期输入控件单击事件private DatePickerDialog.OnDateSetListener DateListener = new DatePickerDialog.OnDateSetListener() {    @Override    public void onDateSet(DatePicker view, int year, int month, int day) {        myYear = year;// (2)①当前选择的日期年赋值给全局年变量        myMonth = month;        myDay = day;        //更新日期        myBirth.setText(myYear + "年" + (myMonth + 1) + "月" + myDay + "日");    }};// (2)③myCheckBoxAccept控件单击事件public void onCheckBoxClick(View view) {    if (myAccept.isChecked()) {        if (isValid(myRePwd)) mySubmit.setEnabled(true);// (2)③两个密码一致, “提交”按钮可用        else myAccept.setChecked(false);    } else mySubmit.setEnabled(false);}// (2)③判断两个密码是否一致，一致返回true，否则falseprivate boolean isValid(EditText editText) {    String pwd = myPwd.getText().toString();    String repwd = editText.getText().toString();    if (!repwd.equals(pwd)) {        editText.setError("两次输入不一致！");// (2)③在密码myRePwd控件中显示错误提示        return false;    } else        return true;}

}

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