android登陆界面

package com.example.myapplication;
 
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
 
public class TextViewActivity extends MainActivity{
   private Button btn1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.text);
       btn1=findViewById(R.id.denglu);
       btn1.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               Toast.makeText(TextViewActivity.this,"登陆成功",Toast.LENGTH_SHORT).show();
           }
       });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp">
 <EditText
     android:layout_width="match_parent"
     android:layout_height="50dp"
     android:text=""
     android:hint="用户名:"
     android:drawableLeft="@drawable/lianxiren"
     android:drawablePadding="10dp"
     android:maxLines="1"
     android:background="@drawable/button_shape"
     android:layout_marginTop="220dp"/>
 
 
    <EditText
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginTop="40dp"
        android:background="@drawable/button_shape"
        android:drawableLeft="@drawable/chesuo"
        android:drawablePadding="10dp"
        android:hint="密码:"
        android:inputType="textPassword"
        android:maxLines="1" />
 
    <Button
        android:id="@+id/denglu"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:text="点击登陆!"
        android:textSize="20dp"
        android:layout_marginLeft="115dp"
        android:background="@drawable/button_denglu"
        android:layout_marginTop="50dp"/>
 
 
</LinearLayout>