今天給大家帶來Android如何實現簡易登陸注冊實例源碼，希望能對各位學員有所幫助。

activity_login

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

<androidx.constraintlayout.widget.ConstraintLayout 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"

tools:context=".MainActivity">

<TextView

android:id="@+id/tv_username"

android:layout_width="wrap_content"

android:layout_height="40dp"

android:layout_marginStart="40dp"

android:layout_marginTop="100dp"

android:gravity="center_vertical"

android:text="賬號："

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<TextView

android:id="@+id/tv_password"

android:layout_width="wrap_content"

android:layout_height="40dp"

android:layout_marginStart="40dp"

android:gravity="center_vertical"

android:text="密碼："

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toBottomOf="@id/tv_username" />

<EditText

android:id="@+id/ed_username"

android:layout_width="300dp"

android:layout_height="40dp"

android:layout_marginTop="100dp"

app:layout_constraintLeft_toRightOf="@id/tv_username"

app:layout_constraintTop_toTopOf="parent" />

<EditText

android:id="@+id/ed_password"

android:layout_width="300dp"

android:inputType="textPassword"

android:layout_height="40dp"

app:layout_constraintLeft_toRightOf="@id/tv_password"

app:layout_constraintTop_toBottomOf="@id/ed_username" />

<Button

android:id="@+id/bu_login"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="300dp"

android:text="登錄"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toLeftOf="@id/bu_register"

app:layout_constraintTop_toTopOf="parent" />

<Button

android:id="@+id/bu_register"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="300dp"

android:text="注冊"

app:layout_constraintLeft_toRightOf="@id/bu_login"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

LoginActivity

package com.jld.exam;

import android.content.Intent;

import android.os.Bundle;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class LoginActivity extends AppCompatActivity {

EditText ed_username;

EditText ed_password;

Button bu_login;

Button bu_register;

String username;

String password;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_login);

ed_username = findViewById(R.id.ed_username);

ed_password = findViewById(R.id.ed_password);

bu_login = findViewById(R.id.bu_login);

bu_register = findViewById(R.id.bu_register);

//登錄按鈕監聽

bu_login.setOnClickListener(v -> {

username = ed_username.getText().toString();

password = ed_password.getText().toString();

//登陸的簡單邏輯

if (username.equals("")) {

Toast.makeText(LoginActivity.this, "請輸入用戶名", Toast.LENGTH_SHORT).show();

} else if (password.equals("")) {

Toast.makeText(LoginActivity.this, "請輸入密碼", Toast.LENGTH_SHORT).show();

} else if (!username.equals("root") || !password.equals("123456")) {

Toast.makeText(LoginActivity.this, "用戶名或密碼錯誤", Toast.LENGTH_SHORT).show();

} else {

Intent intent = new Intent(LoginActivity.this, MainActivity.class);

startActivity(intent);

}

});

//注冊按鈕監聽

bu_register.setOnClickListener(v -> {

Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);

startActivity(intent);

});

}

}

activity_main

<?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">

<TextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="商品列表"

android:layout_marginBottom="30dp"

android:gravity="center_horizontal"/>

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/recycler"

android:layout_width="match_parent"

android:layout_height="wrap_content" />

</LinearLayout>

MainActivity

package com.jld.exam;

import android.graphics.Color;

import android.os.Bundle;

import android.widget.LinearLayout;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.GridLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

public class MainActivity extends AppCompatActivity {

RecyclerViewAdapter recyclerViewAdapter;

private final int[] icno = {R.drawable.clock, R.drawable.signal, R.drawable.box,

R.drawable.second, R.drawable.elephone, R.drawable.ff, R.drawable.notebook, R.drawable.mark, R.drawable.yx,

R.drawable.shop, R.drawable.theme, R.drawable.xl,};

private final String[] name = {"時鐘", "信號", "寶箱", "秒鐘", "大象", "FF", "記事本", "書簽", "印象", "商店", "主題", "迅雷"};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);//GridLayoutManager

GridLayoutManager gridLayoutManager = new GridLayoutManager(MainActivity.this, 3);//創建recyclerview

RecyclerView recyclerView = findViewById(R.id.recycler);//設定布局管理器

recyclerView.setLayoutManager(gridLayoutManager);//創建適配器

recyclerViewAdapter = new RecyclerViewAdapter(icno, name);

recyclerView.setAdapter(recyclerViewAdapter);//設定適配器

}

}

activity_register

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

<androidx.constraintlayout.widget.ConstraintLayout 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"

tools:context=".RegisterActivity">

<TextView

android:id="@+id/textView0"

android:layout_width="match_parent"

android:layout_height="60dp"

android:gravity="center"

android:text="用戶注冊"

android:textSize="30sp"

app:layout_constraintTop_toTopOf="parent" />

<TextView

android:id="@+id/textView1"

android:layout_width="100dp"

android:layout_height="40dp"

android:drawableStart="@drawable/account"

android:gravity="center_vertical"

android:text="用戶名:"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toBottomOf="@id/textView0" />

<EditText

android:id="@+id/editText1"

android:layout_width="300dp"

android:layout_height="40dp"

android:layout_weight="10"

android:autofillHints=""

android:gravity="center_horizontal"

android:inputType="text"

app:layout_constraintLeft_toRightOf="@id/textView1"

app:layout_constraintTop_toBottomOf="@id/textView0" />

<TextView

android:id="@+id/textView2"

android:layout_width="100dp"

android:layout_height="40dp"

android:layout_weight="2"

android:drawableStart="@drawable/password"

android:gravity="center_vertical"

android:text="新密碼:"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toBottomOf="@id/textView1" />

<EditText

android:id="@+id/editText2"

android:layout_width="300dp"

android:layout_height="40dp"

android:layout_weight="10"

android:autofillHints=""

android:gravity="center_horizontal"

android:inputType="textPassword"

app:layout_constraintLeft_toRightOf="@id/textView2"

app:layout_constraintTop_toBottomOf="@id/editText1" />

<TextView

android:id="@+id/textView5"

android:layout_width="100dp"

android:layout_height="40dp"

android:drawableStart="@drawable/phone"

android:gravity="center_vertical"

android:text="手機電話:"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toBottomOf="@id/textView2" />

<EditText

android:id="@+id/editText5"

android:layout_width="300dp"

android:layout_height="40dp"

android:layout_weight="10"

android:autofillHints=""

android:gravity="center_horizontal"

android:inputType="phone"

app:layout_constraintLeft_toRightOf="@id/textView5"

app:layout_constraintTop_toBottomOf="@id/editText2" />

<TextView

android:id="@+id/textView7"

android:layout_width="100dp"

android:layout_height="40dp"

android:drawableStart="@drawable/email"

android:gravity="center_vertical"

android:text="E_mail:"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toBottomOf="@id/editText5" />

<EditText

android:id="@+id/editText7"

android:layout_width="300dp"

android:layout_height="40dp"

android:layout_weight="10"

android:autofillHints=""

android:gravity="center_horizontal"

android:inputType="textEmailAddress"

app:layout_constraintLeft_toRightOf="@id/textView7"

app:layout_constraintTop_toBottomOf="@id/editText5" />

<TextView

android:id="@+id/textView8"

android:layout_width="100dp"

android:layout_height="40dp"

android:drawableStart="@drawable/gender"

android:gravity="center_vertical"

android:text="性別:"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintTop_toBottomOf="@id/textView7" />

<RadioGroup

android:id="@+id/radioGroup8"

android:layout_width="300dp"

android:layout_height="40dp"

android:layout_weight="10"

android:gravity="center_vertical"

android:orientation="horizontal"

app:layout_constraintLeft_toRightOf="@id/textView8"

app:layout_constraintTop_toBottomOf="@id/editText7">

<RadioButton

android:id="@+id/radioButton1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="女" />

<RadioButton

android:id="@+id/radioButton2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="男" />

</RadioGroup>

<Button

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="40dp"

android:text="保存"

app:layout_constraintEnd_toStartOf="@id/button2"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@id/radioGroup8" />

<Button

android:id="@+id/button2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="40dp"

android:text="取消"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toEndOf="@id/button1"

app:layout_constraintTop_toBottomOf="@id/radioGroup8" />

</androidx.constraintlayout.widget.ConstraintLayout>

RegisterActivity

package com.jld.exam;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class RegisterActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_register);

}

}

recyc_item

<?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="wrap_content"

android:orientation="vertical">

<ImageView

android:id="@+id/iv_image"

android:layout_width="60dp"

android:layout_height="60dp"

android:layout_gravity="center_horizontal"

android:contentDescription="TODO"

android:scaleType="centerInside"

android:src="@drawable/ic_launcher_background" />

<TextView

android:id="@+id/tv_desc"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:hint="銷售價格"

android:textSize="14sp" />

</LinearLayout>

RecyclerViewAdapter

package com.jld.exam;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import android.widget.TextView;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {

private final int[] icno;

private final String[] desc;

public RecyclerViewAdapter(int[] icno, String[] desc) {

this.icno = icno;

this.desc = desc;

}

@NonNull

@Override

public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyc_item, parent, false);

return new ViewHolder(view);

}

@Override

public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

holder.imageView.setImageResource(icno[position]);

holder.textView.setText(desc[position]);

}

@Override

public int getItemCount() {

return icno.length;

}

//ViewHolder

public static class ViewHolder extends RecyclerView.ViewHolder {

View item;

ImageView imageView;

TextView textView;

public ViewHolder(@NonNull View itemView) {

super(itemView);

item = itemView;

imageView = itemView.findViewById(R.id.iv_image);

textView = itemView.findViewById(R.id.tv_desc);

}

}

}

總結

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