Custom AlertDialog

It's a example of custom AlertDialog built using AlertDialog.Builder().

package com.exercise.AndroidCustomAlertDialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class AndroidCustomAlertDialog extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        AlertDialog.Builder myDialog 
         = new AlertDialog.Builder(AndroidCustomAlertDialog.this);
        myDialog.setTitle("My Dialog");
     
        ImageView imageView = new ImageView(AndroidCustomAlertDialog.this);
        imageView.setImageResource(R.drawable.icon);
        LayoutParams imageViewLayoutParams 
         = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        imageView.setLayoutParams(imageViewLayoutParams);
        
        TextView textView = new TextView(AndroidCustomAlertDialog.this);
        textView.setText("It's my custom AlertDialog");
        LayoutParams textViewLayoutParams 
         = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        textView.setLayoutParams(textViewLayoutParams);
        
        EditText editText = new EditText(AndroidCustomAlertDialog.this);
        LayoutParams editTextLayoutParams 
      = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
        editText.setLayoutParams(editTextLayoutParams);

        LinearLayout layout = new LinearLayout(AndroidCustomAlertDialog.this);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.addView(imageView);
        layout.addView(textView);
        layout.addView(editText);
        
        myDialog.setView(layout);
            
        myDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            // do something when the button is clicked
            public void onClick(DialogInterface arg0, int arg1) {
     
             }
            });
        
        myDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            // do something when the button is clicked
            public void onClick(DialogInterface arg0, int arg1) {
     
             }
            });
        
        myDialog.show();
    }
}

Download the files.