<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="登录">
    <android.support.v7.widget.AppCompatEditText
        android:id="@+id/UserName"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:text="请输入用户名" />
    <android.support.v7.widget.AppCompatEditText
        android:id="@+id/UserPassWord"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:text="请输入密码" />
    <android.support.v7.widget.AppCompatButton
        android:id="@+id/Login"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:text="登录" />
    <TextView
        android:id="@+id/TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="记住密码" />
</LinearLayout>

package com.example.administrator.demo2;
import android.app.AlertDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //调用父类的onCreate方法
        super.onCreate(savedInstanceState);
        //设置layout中对应的XML文件activity_main
        setContentView(R.layout.activity_main);
        //获取登录按钮
        Button ligin_button = (Button) findViewById(R.id.Login);
        //获取文本框控件
        final EditText userName_edt = (EditText) findViewById(R.id.UserName);
        final EditText userPass_edt = (EditText) findViewById(R.id.UserPassWord);
        //设置“登录”按钮的监听事件
        ligin_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userName = userName_edt.getText().toString();
                String userPass = userName_edt.getText().toString();
                //获取Text控件
                TextView tv = (TextView) findViewById(R.id.TextView);
                //设置Text为本两个文本框的内容
                tv.setText("您的用户名是："+userName+"密码是："+userPass);
                //设置点击登录按钮后跳转到其他地方
                Intent it = new Intent();
                it.setClass(MainActivity.this,Main2Activity.class);
                startActivity(it);
            }
        });
    }
}