Toast 메시지

# 실행 화면

# activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text"/>

</LinearLayout>

# MainActivity.java

package kr.ac.skuniv.keyeventtest;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    Toast toast = null;
    EditText editText;
    String string;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("2018305065 전유정");

        editText = (EditText) findViewById(R.id.edit_text);
        editText.setInputType(0);
        editText.setOnKeyListener(new View.OnKeyListener(){
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                string = editText.getText().toString();
                if(toast != null) toast.cancel();
                toast = Toast.makeText(getApplicationContext(), string, Toast.LENGTH_SHORT);
                toast.show();
                return false;
            }
        });
    }
}