<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="com.example.vico.emailtest.MainActivity">
 
 <EditText
 android:id="@+id/etInputEmail"
 android:layout_width="300dp"
 android:layout_gravity="center_horizontal"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:hint="郵箱"
 android:layout_marginTop="100dp"/>
 
 <Button
 android:id="@+id/btGetNum"
 android:layout_width="150dp"
 android:layout_gravity="center_horizontal"
 android:layout_height="wrap_content"
 android:layout_marginTop="20dp"
 android:onClick="btClick"
 android:text="發(fā)送驗(yàn)證碼" />
 
 <EditText
 android:id="@+id/etInputGetNum"
 android:layout_width="100dp"
 android:layout_gravity="center_horizontal"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:hint="驗(yàn)證碼"
 android:layout_marginTop="100dp"/>
 
 <Button
 android:id="@+id/btSubmit"
 android:layout_width="150dp"
 android:layout_gravity="center_horizontal"
 android:layout_height="wrap_content"
 android:layout_marginTop="20dp"
 android:onClick="btClick"
 android:text="提交" />
 
</LinearLayout>

package com.example.vico.emailtest;
 
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
 
import com.example.vico.other.RandomNumber;
import com.example.vico.other.SendEmail;
 
public class MainActivity extends AppCompatActivity {
 
 private EditText etInputEmail,etInputGetNum;
 
 private long verificationCode=0; //生成的驗(yàn)證碼
 private String email; //郵箱
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 init();
 }
 
 private void init() {
 etInputEmail= (EditText) findViewById(R.id.etInputEmail);
 etInputGetNum= (EditText) findViewById(R.id.etInputGetNum);
 }
 public void btClick(View view){
 switch (view.getId()){
 case R.id.btGetNum:
 email=etInputEmail.getText().toString();
 sendVerificationCode(email); //發(fā)送驗(yàn)證碼
 break;
 case R.id.btSubmit:
 judgeVerificationCode(); //判斷輸入的驗(yàn)證碼是否正確
 break;
 }
 }
 //發(fā)送驗(yàn)證碼
 private void sendVerificationCode(final String email) {
 try {
 new Thread() {
 @Override
 public void run() {
 super.run();
 try {
 RandomNumber rn = new RandomNumber();
 verificationCode = rn.getRandomNumber(6);
 SendEmail se = new SendEmail(email);
 se.sendHtmlEmail(verificationCode);//發(fā)送html郵件
 Toast.makeText(MainActivity.this,"發(fā)送成功",Toast.LENGTH_LONG).show();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 }.start();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 
 //判斷輸入的驗(yàn)證碼是否正確
 private void judgeVerificationCode() {
 if(Integer.parseInt(etInputGetNum.getText().toString())==verificationCode){ //驗(yàn)證碼和輸入一致
 Toast.makeText(MainActivity.this,"驗(yàn)證成功",Toast.LENGTH_LONG).show();
 }else{
 Toast.makeText(MainActivity.this, "驗(yàn)證失敗", Toast.LENGTH_LONG).show();
 }
 }
}

<!-- 允許聯(lián)網(wǎng) -->
 <uses-permission android:name="android.permission.INTERNET"/>
 <!-- 獲取GSM（2g）、WCDMA（聯(lián)通3g）等網(wǎng)絡(luò)狀態(tài)的信息 -->
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 <!-- 獲取wifi網(wǎng)絡(luò)狀態(tài)的信息 -->
 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>