http://androidexample.com/Custom_Dialog_-_Android_Example/index.php?view=article_discription&aid=88&aaid=111

File : res/layout/custom_dialog_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
     
        <Button
            android:id="@+id/buttonClick"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Click To Show Custom Dialog" />
             
    </LinearLayout>

File : res/layout/dialog.xml

Used to create custom dialog layout.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
    <ImageView
        android:id="@+id/imageDialog"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="6dp" />

    <TextView
        android:id="@+id/textDialog"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#FFF"
        android:layout_toRightOf="@+id/imageDialog"/>
 
     <Button
        android:id="@+id/declineButton"
        android:layout_width="100px"
        android:layout_height="wrap_content"
        android:text=" Submit "
        android:layout_marginTop="5dp"
        android:layout_marginRight="5dp"
        android:layout_below="@+id/textDialog"
        android:layout_toRightOf="@+id/imageDialog"
        />
     
</RelativeLayout>

File : src/CustomDialog.java

    import android.widget.Button;
    import android.widget.ImageView;
    import android.widget.TextView;
    import android.app.Activity;
    import android.app.Dialog;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    
    
    public class CustomDialog extends Activity {
    
        private Button buttonClick;
    
        public void onCreate(Bundle savedInstanceState) {
    
            super.onCreate(savedInstanceState);
            setContentView(R.layout.custom_dialog_main);
    
            buttonClick = (Button) findViewById(R.id.buttonClick);
    
            // add listener to button 
            buttonClick.setOnClickListener(new OnClickListener() {
    
                @Override
                public void onClick(View arg0) {
    
                    // Create custom dialog object
                    final Dialog dialog = new Dialog(CustomDialog.this);
                    // Include dialog.xml file
                    dialog.setContentView(R.layout.dialog);
                    // Set dialog title
                    dialog.setTitle("Custom Dialog");
    
                    // set values for custom dialog components - text, image and button
                    TextView text = (TextView) dialog.findViewById(R.id.textDialog);
                    text.setText("Custom dialog Android example.");
                    ImageView image = (ImageView) dialog.findViewById(R.id.imageDialog);
                    image.setImageResource(R.drawable.image0);
    
                    dialog.show();
                    
                    Button declineButton = (Button) dialog.findViewById(R.id.declineButton);
                    // if decline button is clicked, close the custom dialog
                    declineButton.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            // Close dialog
                            dialog.dismiss();
                        }
                    });
    
                    
                }
    
            });
    
        }
    
    }