Android tutorial - Android Textbox- android app development - android studio - android development tutorial



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TextBox:

  • On the Insert tab, in the Text group, click Text Box, and then click Draw Text Box.
  • Click in the document, and then drag to draw the text box the size that you want.
  • To add text to a text box, click inside the text box, and then type or paste text.
  • In Android, you can use “EditText” class to create an editable textbox to accept user input.
  • This tutorial show you how to create a textbox in XML file, and Demo - android emulator - android tutorialnstrates the use of key listener to display message typed in the textbox.
textbox
    .
    android development tutorial

    1. EditText

  • Open “res/layout/main.xml” file, add a “EditText” component.
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<?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>

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android textbox example code

    2. EditText Listener

  • Attach a key listener inside your activity “onCreate()” method, to monitor following events :
  • If “enter” is pressed, display a floating box with the message typed in the “EditText” box.
  • If “Number 9” is pressed, display a floating box with message “Number 9 is pressed!”.
android codes - android tutorial - android sdk
package com.wikitechy.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_7)) {

			// display a floating message
			Toast.makeText(MyAndroidAppActivity.this,
				"Number 7 - Pressed", Toast.LENGTH_LONG).show();
			return true;
		}

		return false;
	}
 });
}
}
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    3. Demo - android emulator - android tutorial

  • Run the application.
  • Type something inside the textbox, and press on the “enter” key :
  • If key “Number 7” is pressed

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