ボタン

package org.example.test;

import android.app.*;
import android.os.*;
import android.view.*;
import android.view.View.*;
import android.widget.*;

public class Button extends Activity
{
    public void onCreate(Bundle savedInstanceState)
    {
      super.onCreate(savedInstanceState);

      LinearLayout ll = new LinearLayout(this);
      ll.setOrientation(LinearLayout.VERTICAL);
      setContentView(ll);

      Button bt = new Button(this);
      bt.setText("Push");

      ll.addView(bt);

      bt.setOnClickListener(new SampleClickListener());
    }

    class SampleClickListener implements OnClickListener
    {
      public void onClick(View v){
        AlertDialog.Builder adlg;
        adlg = new AlertDialog.Builder(HelloWorld.this);
        adlg.setTitle("Test");
        adlg.setMessage("Message");
        adlg.setPositiveButton("YES", null);
        adlg.show();
      }
    }
}