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="10"
        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="10"
        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 = "1234";
        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();
        }
    }


}