App Android que calcula e comenta o seu IMC (de uma maneira um tanto zoeirinha demais pro meu gosto)

IMCCalculator.java

package com.example.labc.imccalculator;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void imccalc(View view) {
        TextView edtPeso = (TextView)findViewById(R.id.edtPeso);
        TextView edtAltura = (TextView)findViewById(R.id.edtAltura);
        TextView edtResult = (TextView)findViewById(R.id.edtResult);
        Toast toast;

        double peso = Double.valueOf(edtPeso.getText().toString());
        double altura = Double.valueOf(edtAltura.getText().toString());
        double imc = peso/(altura*altura);

        edtResult.setText(String.valueOf(imc));

        if (imc < 18.5) {
            toast = Toast.makeText(this, "Sai dai, Seu Madruga!", Toast.LENGTH_LONG);
        } else if ((imc >= 18.5) && (imc < 25)) {
            toast = Toast.makeText(this, "Que issein, filezin", Toast.LENGTH_LONG);
        } else if ((imc >= 25) && (imc < 30)) {
            toast = Toast.makeText(this, "Ta meio monstrao, hein", Toast.LENGTH_LONG);
        } else if((imc >= 30) && (imc < 35)) {
            toast = Toast.makeText(this, "E essa pochetinha ai?", Toast.LENGTH_LONG);
        } else if((imc >= 35) && (imc < 40)) {
            toast = Toast.makeText(this, "Melhor parar de deixar a dieta para segunda", Toast.LENGTH_LONG);
        } else {
            toast = Toast.makeText(this, "Acabou a zoeira, amigo(a), vai se cuidar", Toast.LENGTH_LONG);
        }

        toast.show();
    }
}

IMCCalculator.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <TextView
        android:id="@+id/lblPeso"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="58dp"
        android:text="Informe seu peso em (KG):" />

    <EditText
        android:id="@+id/edtPeso"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/lblPeso"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:hint="digite aqui"
        android:inputType="textPersonName" />

    <TextView
        android:id="@+id/lblAltura"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="135dp"
        android:text="Informe sua altura em (m):" />

    <EditText
        android:id="@+id/edtAltura"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/lblAltura"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:hint="digite aqui"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="215dp"
        android:onClick="imccalc"
        android:text="Calcular" />

    <EditText
        android:id="@+id/edtResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="144dp"
        android:ems="10"
        android:inputType="textPersonName" />

</RelativeLayout>