Android-简单登录模拟

灰太狼 2021-09-08 23:10 477阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg_size_16_color_FFFFFF_t_70]  
activity\_main.xml为：

<?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">
    
        <EditText
            android:id="@+id/username"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="84dp"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="账号"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    
        <EditText
            android:id="@+id/password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="100dp"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="密码"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.525"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/username" />
    
        <Button
            android:id="@+id/login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="104dp"
            android:layout_marginLeft="104dp"
            android:layout_marginTop="112dp"
            android:text="登录"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/password" />
    
        <Button
            android:id="@+id/sign"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="32dp"
            android:layout_marginLeft="32dp"
            android:layout_marginTop="112dp"
            android:text="注册"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.222"
            app:layout_constraintStart_toEndOf="@+id/login"
            app:layout_constraintTop_toBottomOf="@+id/password" />
    </androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java为

package com.example.login;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity { 
    
        @Override
        protected void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            final EditText username=(EditText)findViewById(R.id.username);
            final EditText password=(EditText)findViewById(R.id.password);
            Button login=(Button)findViewById(R.id.login);
            Button sign=(Button)findViewById(R.id.sign);
    
            login.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View view) { 
                    if(username.getText().toString().equals("a")&&password.getText().toString().equals("1"))
                    { 
                        Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_LONG).show();
                    }else{ 
                        Toast.makeText(MainActivity.this,"用户名或密码错误",Toast.LENGTH_LONG).show();
                    }
                }
            });
            sign.setOnClickListener(new View.OnClickListener() { 
                @Override
                public void onClick(View view) { 
                    Toast.makeText(MainActivity.this,"注册成功",Toast.LENGTH_LONG).show();
    
                }
            });
        }
    }

效果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20210707093140479.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2021070710222311.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg==,size_16,color_FFFFFF,t_70