HelloAndroid.java

    package com.android.hello;

    import android.app.Activity;
    import android.os.Bundle;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.EditText;
    import android.widget.LinearLayout;
    import android.view.View;
    import android.view.View.OnClickListener;

    public class HelloAndroid extends Activity
    {
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);

    		final EditText editText = new EditText(this);
    		editText.setWidth(240);
    		final TextView textView = new TextView(this);
    		Button button = new Button(this);
    		button.setText("Click Me");
    		button.setOnClickListener(new Button.OnClickListener() {
            	public void onClick(View v) {
    				textView.setText(editText.getText());
                }
            });

    		LinearLayout form = new LinearLayout(this);
    		LinearLayout main = new LinearLayout(this);
    		main.setOrientation(LinearLayout.VERTICAL);
	
    		form.addView(editText);
    		form.addView(button);
    		main.addView(form);
    		main.addView(textView);
	
            setContentView(main);
        }
    }