登录页面练习

主页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RadioGroup
        android:id="@+id/rg_login"
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rb_password"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:checked="true"
            android:text="@string/login_by_password"
            android:textSize="@dimen/common_font_size"
            android:textColor="@color/black"/>

        <RadioButton
            android:id="@+id/rb_verifycode"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="@string/login_by_verifycode"
            android:textSize="@dimen/common_font_size"
            android:textColor="@color/black"/>

    </RadioGroup>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">
        
        <TextView
            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"/>
        
        <EditText
            android:id="@+id/et_phone"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            android:background="@drawable/editext_selector"
            android:hint="@string/input_phone_number"
            android:inputType="number"
            android:maxLength="11"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textSize="@dimen/common_font_size"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <TextView
            android: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"/>

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

            <EditText
                android: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:background="@drawable/editext_selector"
                android:hint="@string/input_password"
                android:inputType="numberPassword"
                android:maxLength="11"
                android:textColor="@color/black"
                android:textColorHint="@color/grey"
                android:textSize="@dimen/common_font_size"/>
            
            <Button
                android:id="@+id/btn_forget"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_alignParentEnd="true"
                android:text="@string/forget_password"
                android:textColor="@color/black"
                android:textSize="@dimen/common_font_size"/>

        </RelativeLayout>

    </LinearLayout>

    <CheckBox
        android:id="@+id/ck_remember"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:button="@drawable/checkbox_selector"
        android:text="@string/remember_password"
        android:textColor="@color/black"
        android:textSize="@dimen/common_font_size" />

    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/login"
        android:textColor="@color/black"
        android:textSize="@dimen/button_font_size" />
</LinearLayout>

主功能

package com.example.login_text;

import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContract;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
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.login_text.util.ViewUtil;

import java.util.Random;

public class LoginMainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, View.OnClickListener {

    private TextView tv_password;
    private EditText et_password;
    private Button btn_forget;
    private CheckBox ck_remember;
    private RadioButton rb_password;
    private RadioButton rb_verifycode;
    private EditText et_phone;
    private Button btn_login;
    private ActivityResultLauncher<Intent> register;
    private String mPassword = "111111";
    private String mVerifyCode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_main);
        RadioGroup rb_login = findViewById(R.id.rg_login);
        tv_password = findViewById(R.id.tv_password);
        et_phone = findViewById(R.id.et_phone);
        et_password = findViewById(R.id.et_password);
        btn_forget = findViewById(R.id.btn_forget);
        ck_remember = findViewById(R.id.ck_remember);
        rb_password = findViewById(R.id.rb_password);
        rb_verifycode = findViewById(R.id.rb_verifycode);
        btn_login = findViewById(R.id.btn_login);
        // 给rg_login设置单选监听器
        rb_login.setOnCheckedChangeListener(this);
        // 给et_phone添加文本变更监听器
        et_phone.addTextChangedListener(new HideTextWatcher(et_phone, 11));
        // 给et_password添加文本变更监听器
        et_password.addTextChangedListener(new HideTextWatcher(et_password, 6));
        btn_forget.setOnClickListener(this);
        btn_login.setOnClickListener(this);
        rb_login.setOnCheckedChangeListener(this);

        register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {

            @Override
            public void onActivityResult(ActivityResult result) {
                Intent intent = result.getData();
                if(intent != null && result.getResultCode() == Activity.RESULT_OK)
                {
                    // 用户密码已改为新密码，故更新密码变量
                    mPassword = intent.getStringExtra("new_password");
                }
            }
        });
    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch(checkedId){
            case R.id.rb_password:
                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);
                break;
            case R.id.rb_verifycode:
                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);
                break;
        }

    }

    @Override
    public void onClick(View v ) {

        String phone = et_phone.getText().toString();
        if (phone.length() < 11) {
            Toast.makeText(this, "手机号位数错误", Toast.LENGTH_SHORT).show();
            return;
        }
        switch (v.getId()) {
            case R.id.btn_forget:
                if (rb_password.isChecked()) {
                    // 选择了密码方式校验，此时要跳到找回密码页面
                    Intent intent = new Intent(this, LoginForgetActivity.class);
                    intent.putExtra("phone", phone);
                    register.launch(intent);
                } else if (rb_verifycode.isClickable()) {
                    // 生成六位随机数字的验证码
                    mVerifyCode = String.format("%06d", new Random().nextInt(999999));
                    // 以下弹出提醒对话框，提示用户记住六位验证码数字
                    AlertDialog.Builder builder = new AlertDialog.Builder(this);
                    builder.setTitle("请记住验证码");
                    builder.setMessage("手机号" + phone + ",本次验证码是" + mVerifyCode + ",请输入验证码");
                    builder.setPositiveButton("好的", null);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
                break;
            case R.id.btn_login:
                // 密码方式校验
                if (rb_password.isChecked()) {
                    if (!mPassword.equals(et_password.getText().toString())) {
                        Toast.makeText(this, "密码错误", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    // 提示用户登录成功
                    loginSuccess();
                } else if (rb_verifycode.isClickable()) {
                    if (!mVerifyCode.equals(et_password.getText().toString())) {
                        Toast.makeText(this, "验证码错误", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    // 提示用户登录成功
                    loginSuccess();
                }
                break;
        }
    }

    private void loginSuccess() {
        String desc = String.format("您的手机号码是%s，恭喜你通过登录验证，点击“确定”按钮返回上个页面",
                et_phone.getText().toString());
        // 以下弹出提醒对话框，提示用户登录成功
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("登录成功");
        builder.setMessage(desc);
        builder.setPositiveButton("确定返回", (dialog, which) -> {
            // 结束当前的活动页面
            finish();
        });
        builder.setNegativeButton("我再看看", null);
        AlertDialog dialog = builder.create();
        dialog.show();
    }

    // 定义一个编辑框监听器，在输入文本达到指定长度时自动隐藏输入法
    private class HideTextWatcher implements TextWatcher {
        private EditText mView;
        private int mMaxLength;

        public HideTextWatcher(EditText v, int maxLength) {
            this.mView = v;
            this.mMaxLength = maxLength;
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            if (s.toString().length() == mMaxLength) {
                // 隐藏输入法软键盘
                ViewUtil.hideOneInputMethod(LoginMainActivity.this, mView);
            }
        }
    }
}

忘记密码页面xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <TextView
            android: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"/>

        <EditText
            android:id="@+id/et_password_first"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            android:background="@drawable/editext_selector"
            android:hint="@string/input_new_password_hint"
            android:inputType="number"
            android:maxLength="11"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textSize="@dimen/common_font_size"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <TextView
            android: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"/>

        <EditText
            android:id="@+id/et_password_second"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            android:background="@drawable/editext_selector"
            android:hint="@string/input_new_password_again"
            android:inputType="number"
            android:maxLength="11"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textSize="@dimen/common_font_size"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/verifycode2"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size"/>

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

            <EditText
                android: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:background="@drawable/editext_selector"
                android:hint="@string/input_verifycode"
                android:inputType="number"
                android:maxLength="11"
                android:textColor="@color/black"
                android:textColorHint="@color/grey"
                android:textSize="@dimen/common_font_size"/>

            <Button
                android:id="@+id/btn_verifycode"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_alignParentEnd="true"
                android:text="@string/get_verifycode"
                android:textColor="@color/black"
                android:textSize="@dimen/common_font_size"/>

        </RelativeLayout>

    </LinearLayout>

    <Button
        android:id="@+id/btn_confirm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/done"
        android:textColor="@color/black"
        android:textSize="@dimen/button_font_size" />
</LinearLayout>

忘记密码功能java

package com.example.login_text;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.app.AlertDialog;
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 mVerifyCode;
    private EditText et_password_first;
    private EditText et_password_second;
    private EditText et_verifycode;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_forget);
        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);
        // 从上一个页面获取要修改密码的手机号码
         mPhone = getIntent().getStringExtra("phone");

        findViewById(R.id.btn_verifycode).setOnClickListener(this);
        findViewById(R.id.btn_confirm).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn_verifycode:
                // 生成六位随机数字的验证码
                mVerifyCode = String.format("%06d", new Random().nextInt(999999));
                // 以下弹出提醒对话框，提示用户记住六位验证码数字
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("请记住验证码");
                builder.setMessage("手机号" + mPhone + ",本次验证码是" + mVerifyCode + ",请输入验证码");
                builder.setPositiveButton("好的", null);
                AlertDialog dialog = builder.create();
                dialog.show();
                break;
            case R.id.btn_confirm:
                // 点击了“确定”按钮
                String password_first = et_password_first.getText().toString();
                String password_second = et_password_second.getText().toString();
                if(password_first.length() < 6)
                {
                    Toast.makeText(this, "位数错误", Toast.LENGTH_SHORT).show();
                    return;
                }
                if(!password_first.equals(password_second))
                {
                    Toast.makeText(this, "两次输入的新密码不一致", Toast.LENGTH_SHORT).show();
                    return;
                }
                Toast.makeText(this, "密码修改成功", Toast.LENGTH_SHORT).show();
                // 以下把修改好的新密码返回给上一个页面
                Intent intent = new Intent();
                intent.putExtra("new_password",password_first);
                setResult(Activity.RESULT_OK , intent);
                finish();
                break;
        }
    }
}