你好，我是新来的Android工作室我刚刚学会了如何记录和烤面包的工作，所以我想测试一下，但我的按钮没有显示任何。下面的代码：

main activity.Java

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

public void me(View view) {

EditText editText = (EditText) findViewById(R.id.editText);

Log.i("Info","Button pressed");

Toast.makeText(this, "Hello! " + editText.getText().toString(),

Toast.LENGTH_LONG).show();

}

activity_main.xml中

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">

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginStart="72dp"

android:layout_marginLeft="72dp"

android:layout_marginTop="35dp"

android:layout_marginEnd="73dp"

android:layout_marginRight="73dp"

android:text="@string/what_is_your_name"

android:textSize="30sp"

android:textStyle="bold"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

android:id="@+id/editText"

android:layout_width="371dp"

android:layout_height="44dp"

android:layout_marginStart="16dp"

android:layout_marginLeft="16dp"

android:layout_marginTop="75dp"

android:layout_marginEnd="16dp"

android:layout_marginRight="16dp"

android:layout_marginBottom="536dp"

android:ems="10"

android:hint="@string/name_please"

android:inputType="textPersonName"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/textView"

android:autofillHints="" tools:targetApi="o" />

android:id="@+id/button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginStart="162dp"

android:layout_marginLeft="162dp"

android:layout_marginTop="67dp"

android:layout_marginEnd="160dp"

android:layout_marginRight="160dp"

android:layout_marginBottom="421dp"

android:text="@string/click_me"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/editText" />