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

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/hoten"
        android:layout_marginBottom="174dp"
        android:drawableLeft="@drawable/icons"
        android:ems="10"
        android:hint="Tài Khoản"
        android:inputType="textPersonName"
        android:textColor="#ff00"
        android:textColorHint="#ff0"
        android:textSize="26sp" />

    <Button
        android:id="@+id/hoten"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_marginEnd="0dp"
        android:layout_marginRight="0dp"
        android:layout_marginBottom="424dp"
        android:text="Lấy nội dung" />
</RelativeLayout>






package com.example.edittext;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText edtNoiDung;
    Button btnClick;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edtNoiDung=(EditText) findViewById(R.id.editText);
        btnClick=(Button) findViewById(R.id.hoten);
        btnClick.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String noiDung=edtNoiDung.getText().toString();
                Toast.makeText(MainActivity.this, noiDung, Toast.LENGTH_SHORT).show();

            }
        });
    }
}