<?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/option"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />

</LinearLayout>

final AlertDialog.Builder builder = new AlertDialog.Builder(this);
Button option_button=(Button)findViewById(R.id.option);

option_button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
AlertDialog.Builder alertbox = new AlertDialog.Builder(AlertDialogSamples.this);

alertbox.setMessage("Simple Alert Dialog box"); // Message to be displayed

alertbox.setPositiveButton("Yes",new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}

});

alertbox.setNegativeButton("No", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}

});

// show the alert box will be swapped by other code later
alertbox.show();
}
});

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</RelativeLayout>

<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:prompt="@string/prompt"
/>

<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CheckBox" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dead" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Mango" />

</LinearLayout>

       LayoutInflater li = getLayoutInflater();
View v = li.inflate(R.layout.ne, null);
builder.setView(v);