Android: Dial a phone number

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

public class DialANumber extends Activity {

      EditText mEditText_number = null;

      LinearLayout mLinearLayout_no_button = null;

      Button mButton_dial = null;

     

      @Override

      public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            mLinearLayout_no_button = new LinearLayout(this);

           

            mEditText_number = new EditText(this);

            mEditText_number.setText("5551222");

            mLinearLayout_no_button.addView(mEditText_number);

            mButton_dial = new Button(this);

            mButton_dial.setText("Dial!");

            mLinearLayout_no_button.addView(mButton_dial);

            mButton_dial.setOnClickListener(new View.OnClickListener() {

                  public void onClick(View v) {

                             performDial();

                  }

            });

           

            setContentView(mLinearLayout_no_button);

      }

     

      public boolean onKeyDown(int keyCode, KeyEvent event) {

            if (keyCode == KeyEvent.KEYCODE_CALL) {

                  performDial();

                  return true;

            }

            return false;

      }

     

      public void performDial(){

            if(mEditText_number!=null){

                  try {

                        startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + mEditText_number.getText())));

                  }

                  catch (Exception e)

                  {

                        e.printStackTrace();

                  }

            }

      }

}