Toast: 키다운 이벤트

키보드를 눌렀을 때의 이벤트

1. 레이아웃

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.progdv.app03_toast2.MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20sp"
        android:hint="id를 입력하세요." />

</RelativeLayout>

2. 기능 구현

setOnKeyListener 메서드를 이용하여 키 입력을 처리한다.

package com.progdv.app03_toast2;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText editText;

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

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

        editText.setOnKeyListener(new View.OnKeyListener() {
            @Override  // 키입력 처리 메서드
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if(event.getAction() == KeyEvent.ACTION_DOWN
                        && keyCode == KeyEvent.KEYCODE_ENTER){
                    Toast.makeText(getApplicationContext(),
                            editText.getText(),
                            Toast.LENGTH_LONG).show();
                    return true;
                }
                return false;
            }
        });

    }
}

키보드로 타자를 친 뒤 엔터를 누르면 밑에 해당 키가 뜬다.

3. 기능 구현: Toast 창 뜨는 위치 변경

package com.progdv.app03_toast2;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText editText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText)findViewById(R.id.editText);

        editText.setOnKeyListener(new View.OnKeyListener() {
            @Override  // 키입력 처리 메서드
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if(event.getAction() == KeyEvent.ACTION_DOWN
                        && keyCode == KeyEvent.KEYCODE_ENTER){
                    Toast t = Toast.makeText(getApplicationContext(),editText.getText(),
                            Toast.LENGTH_LONG);
                    t.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
                    t.show();
                    return true;
                }
                return false;
            }
        });

    }
}