【Android学习】简单的登录页面和业务逻辑实现

实现功能

1 登录页：密码登录和验证码登录
2 忘记密码页：修改密码
3 页面基础逻辑 java代码

基础页面

XML

login_main.xml

<?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">
<!--    单选框--><RadioGroupandroid:id="@+id/rg_login"android:layout_width="match_parent"android:layout_height="@dimen/item_layout_height"android:orientation="horizontal"><RadioButtonandroid:id="@+id/rg_password"android:layout_width="0dp"android:layout_weight="1"android:layout_height="match_parent"android:text="@string/login_by_password"android:textSize="@dimen/common_font_size"android:checked="true"/><RadioButtonandroid:id="@+id/rg_vertifycode"android:layout_width="0dp"android:layout_weight="1"android:layout_height="match_parent"android:text="@string/login_by_vertifycode"android:textSize="@dimen/common_font_size"/></RadioGroup><LinearLayoutandroid:layout_width="match_parent"android:layout_height="@dimen/item_layout_height"android:orientation="horizontal"><TextViewandroid:id="@+id/tv_phone"android:layout_width="wrap_content"android:layout_height="match_parent"android:gravity="center"android:text="@string/phone_number"android:textColor="@color/black"android:textSize="@dimen/common_font_size"/><EditTextandroid:id="@+id/et_phone"android:layout_width="0dp"android:layout_weight="1"android:layout_height="match_parent"android:layout_marginTop="5dp"android:layout_marginBottom="5dp"android:hint="@string/inout_phone_number"android:background="@drawable/editor_selector"android:textColor="@color/black"android:maxLength="11"android:inputType="number"android:textColorHint="@color/grey"android:textSize="@dimen/common_font_size"/></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="@dimen/item_layout_height"android:orientation="horizontal"><TextViewandroid:id="@+id/tv_password"android:layout_width="wrap_content"android:layout_height="match_parent"android:gravity="center"android:text="@string/login_password"android:textColor="@color/black"android:textSize="@dimen/common_font_size"/><RelativeLayoutandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"><EditTextandroid:id="@+id/et_password"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:layout_marginTop="5dp"android:layout_marginBottom="5dp"android:inputType="numberPassword"android:hint="@string/input_password"android:background="@drawable/editor_selector"android:textColor="@color/black"android:maxLength="6"android:textColorHint="@color/grey"android:textSize="@dimen/common_font_size"/><Buttonandroid:id="@+id/btn_forget"android:layout_width="wrap_content"android:layout_height="match_parent"android:text="@string/forget_password"android:layout_alignParentEnd="true"android:textColorHint="@color/black"android:textSize="@dimen/common_font_size"/></RelativeLayout></LinearLayout><CheckBoxandroid:id="@+id/ck_remember"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/remember_password"android:textColorHint="@color/black"android:textSize="@dimen/common_font_size"/><Buttonandroid:id="@+id/btn_login"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/login"android:textColorHint="@color/black"android:textSize="@dimen/btn_font_size"/>
</LinearLayout>

login_forget_password.xml

<?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"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="60dp"android:orientation="horizontal"><TextViewandroid:layout_width="wrap_content"android:layout_height="match_parent"android:gravity="center"android:text="@string/input_new_password"android:textColor="@color/black"android:textSize="@dimen/common_font_size"/><EditTextandroid:id="@+id/et_password_first"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:layout_marginTop="5dp"android:layout_marginBottom="5dp"android:inputType="numberPassword"android:hint="@string/input_new_password_hint"android:background="@drawable/editor_selector"android:textColor="@color/black"android:maxLength="11"android:textColorHint="@color/grey"android:textSize="@dimen/common_font_size"/></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="60dp"android:orientation="horizontal"><TextViewandroid:layout_width="wrap_content"android:layout_height="match_parent"android:gravity="center"android:text="@string/confirm_new_password"android:textColor="@color/black"android:textSize="@dimen/common_font_size"/><EditTextandroid:id="@+id/et_password_second"android:layout_width="0dp"android:layout_weight="1"android:layout_height="match_parent"android:layout_marginTop="5dp"android:layout_marginBottom="5dp"android:hint="@string/confirm_new_password_again"android:background="@drawable/editor_selector"android:textColor="@color/black"android:maxLength="11"android:inputType="number"android:textColorHint="@color/grey"android:textSize="@dimen/common_font_size"/></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="60dp"android:orientation="horizontal"><TextViewandroid:layout_width="wrap_content"android:layout_height="match_parent"android:gravity="center"android:text="@string/verifycode"android:textColor="@color/black"android:textSize="@dimen/common_font_size"/><RelativeLayoutandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"><EditTextandroid:id="@+id/et_verifycode"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:layout_marginTop="5dp"android:layout_marginBottom="5dp"android:inputType="numberPassword"android:hint="@string/input_verifycode"android:background="@drawable/editor_selector"android:textColor="@color/black"android:maxLength="6"android:textColorHint="@color/grey"android:textSize="@dimen/common_font_size"/><Buttonandroid:id="@+id/btn_verificode"android:layout_width="wrap_content"android:layout_height="match_parent"android:text="@string/get_verifycode"android:layout_alignParentEnd="true"android:textColorHint="@color/black"android:textSize="@dimen/common_font_size"/></RelativeLayout></LinearLayout><Buttonandroid:id="@+id/btn_confirm"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/done"android:textColorHint="@color/black"android:textSize="@dimen/btn_font_size"/>
</LinearLayout>

Java

loginMain.java

package com.example.learn;import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.BlendMode;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;import com.example.learn.utils.ViewUtil;import java.util.Random;public class LoginMainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, View.OnClickListener {private EditText et_phone;private TextView tv_password;private EditText et_password;private Button btn_forget;private CheckBox ck_remember;private RadioButton rg_password;private RadioButton rg_vertifycode;private ActivityResultLauncher<Intent> register;private Button btn_login;//定义固定密码 调试使用private String mPassword = "111111";private String verifyCode;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login_main);RadioGroup rg_login = findViewById(R.id.rg_login);et_phone = findViewById(R.id.et_phone);tv_password = findViewById(R.id.tv_password);et_password = findViewById(R.id.et_password);btn_forget = findViewById(R.id.btn_forget);ck_remember = findViewById(R.id.ck_remember);rg_password = findViewById(R.id.rg_password);rg_vertifycode = findViewById(R.id.rg_vertifycode);btn_login = findViewById(R.id.btn_login);//设置监听器rg_login.setOnCheckedChangeListener(this);//为电话号码、密码增加文本长度变换监听器et_phone.addTextChangedListener(new HideKeyboardWatch(et_phone, 11));et_password.addTextChangedListener(new HideKeyboardWatch(et_password, 6));//为忘记密码/获取验证码增加点击事件btn_forget.setOnClickListener(this);//login按钮btn_login.setOnClickListener(this);//全局registerActivityForResultregister = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(),new ActivityResultCallback<ActivityResult>() {//接收返回值@Overridepublic void onActivityResult(ActivityResult result) {Intent intent = result.getData();if(intent!=null && result.getResultCode()==Activity.RESULT_OK){mPassword = intent.getStringExtra("new_password");}}});}@Overridepublic void onCheckedChanged(RadioGroup radioGroup, int checkedId) {switch (checkedId) {case R.id.rg_password://密码登录//验证码登录tv_password.setText(getString(R.string.login_password));et_password.setHint(getString(R.string.input_password));btn_forget.setText(getString(R.string.forget_password));ck_remember.setVisibility(View.VISIBLE);//显示break;case R.id.rg_vertifycode://验证码登录tv_password.setText(getString(R.string.verifycode));et_password.setHint(getString(R.string.input_verifycode));btn_forget.setText(getString(R.string.get_verifycode));ck_remember.setVisibility(View.GONE);//隐藏break;}}@Overridepublic void onClick(View view) {String phone = et_phone.getText().toString();if (phone.length() < 11) {Toast.makeText(this, "手机号码不足11位", Toast.LENGTH_SHORT).show();return;}switch (view.getId()) {case R.id.btn_forget://说明选择是密码登录// 此时按钮为忘记密码if (rg_password.isChecked()) {//此时可将手机号传递给下一个忘记密码页面Intent intent = new Intent(this, LoginForgetActivity.class);intent.putExtra("phone", phone);register.launch(intent);}else if(rg_vertifycode.isChecked()){//生成6位随机验证码verifyCode = String.format("%6d",new Random().nextInt(999999));//弹出对话框 便于用户记住验证码AlertDialog.Builder adb = new AlertDialog.Builder(this);adb.setTitle("请记住验证码");adb.setMessage("手机号"+phone+"，验证码为"+verifyCode+",请输入验证码！");adb.setPositiveButton("好的",null);AlertDialog ad =adb.create();ad.show();}break;case R.id.btn_login://如果密码方式登录 判断密码是否正确if(rg_password.isChecked()){if(!mPassword.equals(et_password.getText().toString())){Toast.makeText(this,"请输入正确密码",Toast.LENGTH_SHORT).show();return;}loginSuccess();}else if(rg_vertifycode.isChecked()){if(!verifyCode.equals(et_password.getText().toString())){Toast.makeText(this,"请输入正确验证码",Toast.LENGTH_SHORT).show();return;}loginSuccess();}break;}}private void loginSuccess() {String desc=String.format("您的手机号码为%s，恭喜您登陆成功！",et_phone.getText().toString());AlertDialog.Builder adb = new AlertDialog.Builder(this);adb.setTitle("恭喜您登陆成功!");adb.setMessage("您的手机号为"+et_phone.getText().toString());adb.setNegativeButton("确定返回", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {//结束当前活动页面finish();}});adb.setPositiveButton("我再看看",null);AlertDialog ad = adb.create();ad.show();}//编辑框监听器，当输入文本长度达到最大长度，隐藏键盘。private class HideKeyboardWatch implements TextWatcher {private EditText mView;private int maxLen;public HideKeyboardWatch(EditText et, int len) {this.mView = et;this.maxLen = len;}@Overridepublic void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}@Overridepublic void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}@Overridepublic void afterTextChanged(Editable s) {if (s.toString().length() == maxLen) {//隐藏软键盘ViewUtil.hideKeyboard(LoginMainActivity.this, mView);}}}
}

login_forget_password.java

package com.example.learn;import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;import java.util.Random;public class LoginForgetActivity extends AppCompatActivity implements View.OnClickListener {private String mPhone;private String verifyCode;private EditText et_password_first;private EditText et_password_second;private EditText et_verifycode;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login_forget);mPhone = getIntent().getStringExtra("phone");findViewById(R.id.btn_verificode).setOnClickListener(this);findViewById(R.id.btn_confirm).setOnClickListener(this); et_password_first = findViewById(R.id.et_password_first);et_password_second = findViewById(R.id.et_password_second);et_verifycode = findViewById(R.id.et_verifycode);}@Overridepublic void onClick(View view) {switch(view.getId()){case R.id.btn_verificode://生成6位随机验证码verifyCode = String.format("%6d",new Random().nextInt(999999));//弹出对话框 便于用户记住验证码AlertDialog.Builder adb = new AlertDialog.Builder(this);adb.setTitle("请记住验证码");adb.setMessage("手机号"+mPhone+"，验证码为"+verifyCode+",请输入验证码！");adb.setPositiveButton("好的",null);AlertDialog ad =adb.create();ad.show();break;case R.id.btn_confirm:String pf = et_password_first.getText().toString();String ps = et_password_second.getText().toString();if(pf.length()<6){Toast.makeText(this,"请输入正确密码",Toast.LENGTH_SHORT).show();return;}if(!pf.equals(ps)){Toast.makeText(this,"两次密码不同",Toast.LENGTH_SHORT).show();return;}if(!verifyCode.equals(et_verifycode.getText().toString())){Toast.makeText(this,"验证码不正确",Toast.LENGTH_SHORT).show();return;}Toast.makeText(this,"密码修改成功",Toast.LENGTH_SHORT).show();Intent intent = new Intent();intent.putExtra("new_password",pf);setResult(Activity.RESULT_OK,intent);finish();//结束当前页面break;}}
}