Android studio 开发一个用户登录界面

Android studio 开发一个用户登录界面

activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.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">

     <Button
         android:id="@+id/button"
         android:layout_width="203dp"
         android:layout_height="46dp"
         android:layout_marginEnd="120dp"
         android:layout_marginRight="120dp"
         android:layout_marginBottom="148dp"
         android:hint="登录"
         android:onClick="Check"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintHorizontal_bias="1.0"
         app:layout_constraintStart_toStartOf="parent" />

     <EditText
         android:id="@+id/name"
         android:layout_width="209dp"
         android:layout_height="50dp"
         android:layout_marginTop="324dp"
         android:layout_marginEnd="92dp"
         android:layout_marginRight="92dp"
         android:ems=""
         android:hint="用户名"
         android:inputType="textPersonName"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="parent" />

     <EditText
         android:id="@+id/pass"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="200dp"
         android:layout_marginEnd="96dp"
         android:layout_marginRight="96dp"
         android:ems=""
         android:hint="密码"
         android:inputType="textPersonName"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="parent" />

 </android.support.constraint.ConstraintLayout>

MainActivity.java

 package com.example.myapplication;

 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {
     EditText name;  //用户名
     EditText pass;  //密码
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         //写代码
         name=(EditText) findViewById(R.id.name);  //获取用户名
         pass=(EditText) findViewById(R.id.pass);  //获取密码

     }
     //登录验证代码
     public void  Check(View v) {
         String mname = "hello";
         String mpass = "";
         String user = name.getText().toString().trim();
         String pwd = pass.getText().toString().trim();
         if (user.equals(mname) && pwd.equals(mpass)) {
             Toast.makeText(this, "恭喜，通过", Toast.LENGTH_SHORT).show();
         } else {
             Toast.makeText(this, "很遗憾，继续努力", Toast.LENGTH_SHORT).show();
         }
     }

 }