<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:orientation="vertical"
        android:padding="30dp">
        <TextView
            android:id="@+id/text1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="QQ"
            android:textSize="40sp" />
        <EditText
            android:id="@+id/edt1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="35dp"
            android:hint="QQ号/邮箱/手机号" />
        <EditText
            android:id="@+id/edt2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="密码"
            android:password="true"/>

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp">

            <TextView
                android:id="@+id/text2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="忘记密码?"
                android:textColor="#00aaff" />

            <TextView
                android:id="@+id/text3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:text="新用户注册"
                android:textColor="#00aaff" />
        </RelativeLayout>
        <Button
            android:id="@+id/btn1"
            android:layout_width="match_parent"
            android:layout_margin="10dp"
            android:layout_height="40dp"
            android:text="登录"
            android:textSize="20sp"
            android:background="#87CEFF"
            android:onClick="click"
            />

    </LinearLayout>



    <TextView
        android:id="@+id/text4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="30dp"
        android:text="登陆即代表阅读并同意"
        android:layout_marginLeft="56dp"
        android:textColor="#FFFAFA"
        android:textSize="20sp" />
    <TextView
        android:id="@+id/text5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_toRightOf="@+id/text4"
        android:layout_marginBottom="30dp"
        android:text="阅读条款"
        android:textColor="#00aaff"
        android:textSize="20sp" />



</RelativeLayout>

package com.example.wzrqq;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button btn1;
    EditText account = null;
    EditText code = null;
    EditText t1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        t1=(EditText) findViewById(R.id.edt1);
        account = (EditText) findViewById(R.id.edt1);
        code = (EditText) findViewById(R.id.edt2);
        btn1=(Button) findViewById(R.id.btn1);
        btn1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                String username = ((EditText) findViewById(R.id.edt1)).getText().toString();
                String pwd = ((EditText) findViewById(R.id.edt2)).getText().toString();
                if (username.equals("123456") && pwd.equals("123456")) {
                    Toast.makeText(MainActivity.this,"登陆成功",Toast.LENGTH_SHORT).show();

                } else {
                    t1.setText("账号或密码错误请重新输入");
                    Toast.makeText(MainActivity.this,"登陆失败",Toast.LENGTH_SHORT).show();
                }
            }

        });


    }
}