myButton = (Button)findViewById(R.id.SwitchBtn);
        myButton.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v) 
            { 
                NumberPicker test = new NumberPicker(main.this);
            }
        });

<TableRow>
        <ch.android.ebd.NumberPicker 
            android:id="@+id/Multistate"
            android:gravity="center"
            />                    
    </TableRow>

Dialog numPickDialog = new Dialog(this);
numPickDialog.setContentView(R.layout.numberpicker_dialog);
numPickDialog.setTitle("My Numberpicker Dialog");

Button dialogBtn = (Button) findViewById(R.id.DialogButton);
dialogBtn.setOnClickListener(new DialogButtonOpenListener(numPickDialog));

protected class DialogButtonOpenListener implements OnClickListener {

        Dialog dialog;

        public DialogButtonOpenListener(Dialog dialog) {
            this.dialog = dialog;
        }

        public void onClick(View v) {
            dialog.show();
        }
    }

<?xml version="1.0" encoding="utf-8"?>
    <!--
        ** ** Copyright 2008, The Android Open Source Project ** ** Licensed
        under the Apache License, Version 2.0 (the "License"); ** you may not
        use this file except in compliance with the License. ** You may obtain
        a copy of the License at ** **
        http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by
        applicable law or agreed to in writing, software ** distributed under
        the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES
        OR CONDITIONS OF ANY KIND, either express or implied. ** See the
        License for the specific language governing permissions and **
        limitations under the License. */
    -->

<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <eu.kroczek.NumberPickerButton android:id="@+id/increment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/timepicker_up_normal"
        />
    <EditText android:id="@+id/timepicker_input"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:gravity="center" 
        android:singleLine="true"
        style="?android:attr/textAppearanceLargeInverse" 
        android:textSize="30sp"
        android:background="@drawable/timepicker_input_normal" />

    <eu.kroczek.NumberPickerButton
        android:id="@+id/decrement" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:background="@drawable/timepicker_down_normal" />

</merge>

<?xml version="1.0" encoding="utf-8"?>
<!--
**
** Copyright 2008, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
-->

<EditText xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:singleLine="true"
    style="?android:attr/textAppearanceLargeInverse"
    android:textSize="30sp"
    android:background="@drawable/timepicker_input_normal"
    />

numPickDialog.setContentView(R.layout.number_picker);

 <?xml version="1.0" encoding="utf-8"?>
<TableLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:stretchColumns="*">
      <TableRow>
        <dein.pfad.NumberPicker 
            android:id="@+id/NumberPicker"
            android:gravity="center"
            />                    
    </TableRow>
    <TableRow>
        <Button 
        android:id="@+id/DialogBtn" 
        android:layout_height="wrap_content" 
        android:layout_width="wrap_content"
        android:text="ok" 
        android:gravity="center_horizontal|center_vertical"
        />
    </TableRow>
</TableLayout>