Android studio 开发一个用户登录界面

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context=".MainActivity">
 8 
 9     <Button
10         android:id="@+id/button"
11         android:layout_width="203dp"
12         android:layout_height="46dp"
13         android:layout_marginEnd="120dp"
14         android:layout_marginRight="120dp"
15         android:layout_marginBottom="148dp"
16         android:hint="登录"
17         android:onClick="Check"
18         app:layout_constraintBottom_toBottomOf="parent"
19         app:layout_constraintEnd_toEndOf="parent"
20         app:layout_constraintHorizontal_bias="1.0"
21         app:layout_constraintStart_toStartOf="parent" />
22 
23     <EditText
24         android:id="@+id/name"
25         android:layout_width="209dp"
26         android:layout_height="50dp"
27         android:layout_marginTop="324dp"
28         android:layout_marginEnd="92dp"
29         android:layout_marginRight="92dp"
30         android:ems="10"
31         android:hint="用户名"
32         android:inputType="textPersonName"
33         app:layout_constraintEnd_toEndOf="parent"
34         app:layout_constraintTop_toTopOf="parent" />
35 
36     <EditText
37         android:id="@+id/pass"
38         android:layout_width="wrap_content"
39         android:layout_height="wrap_content"
40         android:layout_marginTop="200dp"
41         android:layout_marginEnd="96dp"
42         android:layout_marginRight="96dp"
43         android:ems="10"
44         android:hint="密码"
45         android:inputType="textPersonName"
46         app:layout_constraintEnd_toEndOf="parent"
47         app:layout_constraintTop_toTopOf="parent" />
48 
49 
50 </android.support.constraint.ConstraintLayout>

 1 package com.example.myapplication;
 2 
 3 import android.os.Bundle;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.view.View;
 6 import android.widget.EditText;
 7 import android.widget.Toast;
 8 
 9 public class MainActivity extends AppCompatActivity {
10     EditText name;  //用户名
11     EditText pass;  //密码
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16 
17         //写代码
18         name=(EditText) findViewById(R.id.name);  //获取用户名
19         pass=(EditText) findViewById(R.id.pass);  //获取密码
20 
21     }
22     //登录验证代码
23     public void  Check(View v) {
24         String mname = "hello";
25         String mpass = "1234";
26         String user = name.getText().toString().trim();
27         String pwd = pass.getText().toString().trim();
28         if (user.equals(mname) && pwd.equals(mpass)) {
29             Toast.makeText(this, "恭喜，通过", Toast.LENGTH_SHORT).show();
30         } else {
31             Toast.makeText(this, "很遗憾，继续努力", Toast.LENGTH_SHORT).show();
32         }
33     }
34 
35 
36 }