พื้นฐานการเขียน Android กับโปรแกรมภาษา Java Syntax และการใช้งาน Eclipse เบื้องต้น

package com.myapp;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.NavUtils;
import android.widget.TextView;
import android.graphics.Color;
import android.view.View;
import android.app.AlertDialog;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // Dialog
        final AlertDialog.Builder adb = new AlertDialog.Builder(this);
        
        // textView1
        TextView txtView;
        txtView = (TextView)findViewById(R.id.textView1);
        txtView.setText("Welcome to www.ThaiCreate.Com");
        txtView.setTextColor(Color.RED);
        txtView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
            	// Perform action on click
            	
            	// textView2
                TextView txtView2;
                txtView2 = (TextView)findViewById(R.id.textView2);
                txtView2.setText("Hello www.ThaiCreate.Com");
                
                // Show Dialog
                AlertDialog ad = adb.create();
                ad.setMessage("Hello www.ThaiCreate.Com");
                ad.show();
            }
        });        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    
}

<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" >

</RelativeLayout>