MainClass

package com.example.lucas.teste;

import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {


    Button btnConfirma;
    EditText campo;



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

        campo = (EditText)findViewById(R.id.campo);
        btnConfirma = (Button)findViewById(R.id.btnConfirma);



        btnConfirma.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                String nome = campo.getText().toString();
                campo.setText("");
                Toast.makeText(MainActivity.this, nome, Toast.LENGTH_SHORT).show();

            }
        });



    }

}