Androidのテキストボックスの例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout__width="fill__parent"
    android:layout__height="fill__parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editText"
        android:layout__width="match__parent"
        android:layout__height="wrap__content" >

        <requestFocus/>

    </EditText>

</LinearLayout>

package com.mkyong.android;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.Toast;

public class MyAndroidAppActivity extends Activity {

 private EditText edittext;

 @Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    addKeyListener();
 }

 public void addKeyListener() {

   //get edittext component
    edittext = (EditText) findViewById(R.id.editText);

   //add a keylistener to keep track user input
    edittext.setOnKeyListener(new OnKeyListener() {
    public boolean onKey(View v, int keyCode, KeyEvent event) {

       //if keydown and "enter" is pressed
        if ((event.getAction() == KeyEvent.ACTION__DOWN)
            && (keyCode == KeyEvent.KEYCODE__ENTER)) {

           //display a floating message
            Toast.makeText(MyAndroidAppActivity.this,
                edittext.getText(), Toast.LENGTH__LONG).show();
            return true;

        } else if ((event.getAction() == KeyEvent.ACTION__DOWN)
            && (keyCode == KeyEvent.KEYCODE__9)) {

           //display a floating message
            Toast.makeText(MyAndroidAppActivity.this,
                "Number 9 is pressed!", Toast.LENGTH__LONG).show();
            return true;
        }

        return false;
    }
 });
}
}