Android: Dial A Number

DialANumber.java

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;
	
	/** Called when the activity is first created. */
	@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();
			}
		}//if
	}
}