Use AlertDialog.Builder to build an AlertDialog

package com.java2s.myapplication3.app;
//from   w w w  . j a  v  a2  s .  c om
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity
        implements DialogInterface.OnClickListener, View.OnClickListener {

    private static final String[] ZONES =
            {"Pacific Time", "Mountain Time", "Central Time", "Eastern Time", "Atlantic Time"};

    Button mButton;
    AlertDialog mActions;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTitle("Activity");
        mButton = new Button(this);
        mButton.setText("Click for Time Zones");
        mButton.setOnClickListener(this);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Select Time Zone");
        builder.setItems(ZONES, this);
        builder.setNegativeButton("Cancel", null);
        mActions = builder.create();
        setContentView(mButton);
    }
    @Override
    public void onClick(DialogInterface dialog, int which) {
        String selected = ZONES[which];
        mButton.setText(selected);
    }
   @Override
    public void onClick(View v) {
        mActions.show();
    }
}