Android如何实现简易登陆注册实例源码 - 智科优网络技术服务中心

今天给大家带来Android如何实现简易登陆注册实例源码，希望能对各位W3Cschool学员有所帮助。

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="账号："
  
   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="密码："
  
   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="登录"
  
   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="注册"
  
   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);
  
   //登录按钮监听
  
   bu_login.setOnClickListener(v -> {
  
   username = ed_username.getText().toString();
  
   password = ed_password.getText().toString();
  
   //登陆的简单逻辑
  
   if (username.equals("")) {
  
   Toast.makeText(LoginActivity.this, "请输入用户名", Toast.LENGTH_SHORT).show();
  
   } else if (password.equals("")) {
  
   Toast.makeText(LoginActivity.this, "请输入密码", Toast.LENGTH_SHORT).show();
  
   } else if (!username.equals("root") || !password.equals("123456")) {
  
   Toast.makeText(LoginActivity.this, "用户名或密码错误", Toast.LENGTH_SHORT).show();
  
   } else {
  
   Intent intent = new Intent(LoginActivity.this, MainActivity.class);
  
   startActivity(intent);
  
   }
  
   });
  
   //注册按钮监听
  
   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 = {"时钟", "信号", "宝箱", "秒钟", "大象", "FF", "记事本", "书签", "印象", "商店", "主题", "迅雷"};
  
   @Override
  
   protected void onCreate(Bundle savedInstanceState) {
  
   super.onCreate(savedInstanceState);
  
   setContentView(R.layout.activity_main);//GridLayoutManager
  
   GridLayoutManager gridLayoutManager = new GridLayoutManager(MainActivity.this, 3);//创建recyclerview
  
   RecyclerView recyclerView = findViewById(R.id.recycler);//设定布局管理器
  
   recyclerView.setLayoutManager(gridLayoutManager);//创建适配器
  
   recyclerViewAdapter = new RecyclerViewAdapter(icno, name);
  
   recyclerView.setAdapter(recyclerViewAdapter);//设定适配器
  
   }
  
  }

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="用户注册"
  
   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="用户名:"
  
   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="新密码:"
  
   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="手机电话:"
  
   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="性别:"
  
   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="销售价格"
  
   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);
  
   }
  
   }
  
  }

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