setOnClickListener sürzt ab.

package com.mbfan.verkaufsapp;


import java.util.ArrayList;
import java.util.Map;


import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.Toast;
import android.content.DialogInterface;


public class VerkaufsappActivity extends  Activity implements OnClickListener{
    /** Called when the activity is first created. */
	
	ListView lv_objekte;
	RadioButton rb_eingabe, rb_auslieferung;
	Button cmd_kueche, cmd_hinzufuegen, cmd_speziell;
	ArrayList<Map<String, String>> Getraenke;
	String[] from = { "name", "purpose" };
	int[] to = { android.R.id.text1, android.R.id.text2 };
	
	private void initializeVars() {
		// TODO Auto-generated method stub
		lv_objekte = (ListView) findViewById(R.id.lv_Objekte);
		rb_eingabe = (RadioButton) findViewById(R.id.rb_eingabe);
		rb_auslieferung = (RadioButton) findViewById(R.id.rb_lieferung);
		cmd_kueche = (Button) findViewById(R.id.cmd_kueche);
		cmd_hinzufuegen = (Button) findViewById(R.id.cmd_hinzufuegen);
		cmd_speziell = (Button) findViewById(R.id.cmd_speziell);
	}
	
	private void loaditems() {
		// TODO Auto-generated method stub
		String[] values = new String[] { "Fanta", "Cola", "Wasser", "Mezzo-Mix", "Sprite", "Bixxebacher", "Schnaps", "Wein" };
		ArrayAdapter<String> inhalte_haupt = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_2, android.R.id.text1, values);
		lv_objekte.setAdapter(inhalte_haupt); 
		ArrayAdapter<String> inhalte_down = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_2, android.R.id.text2, values);
		lv_objekte.setAdapter(inhalte_down);
	}
	
	private void setlistener() {
        cmd_kueche.setOnClickListener(this);
        cmd_hinzufuegen.setOnClickListener(this);
        cmd_speziell.setOnClickListener(this);
        lv_objekte.setOnClickListener(this);
	}
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initializeVars();
        setlistener();
        loaditems();
        Toast.makeText(this,"Startvorgang komplett. Willkommen zur Verkaufsapp!",Toast.LENGTH_SHORT).show();


		
	}


    public void onClick(View v) {
		// TODO Auto-generated method stub
    	switch(v.getId()){
		case R.id.lv_Objekte: 
			@SuppressWarnings("unused")
			Object selected = lv_objekte.getSelectedItem();
		case R.id.cmd_kueche:
			msgbox("Keine Bestellungen aufgegeben!");
		}
	}


	public void msgbox(String text) {
		AlertDialog ad = new AlertDialog.Builder(this).create();
		ad.setCancelable(false); // This blocks the 'BACK' button
		ad.setMessage(text);
		ad.setButton("OK", new DialogInterface.OnClickListener() {
		    public void onClick(DialogInterface dialog, int which) {
		        dialog.dismiss();                    
		    }
		});
		ad.show();
	}
}

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


    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:baselineAligned="false"
        android:gravity="fill_vertical" >


        <Button
            android:id="@+id/cmd_kueche"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="@string/control_text_cmd_kueche" />


        <RadioGroup
            android:id="@+id/radioGroup1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >


            <RadioButton
                android:id="@+id/rb_eingabe"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:checked="true"
                android:text="@string/control_text_cb_eingabe" />


            <RadioButton
                android:id="@+id/rb_lieferung"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/control_text_cb_lieferung" />
        </RadioGroup>


        <ProgressBar
            android:id="@+id/progressBar1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="invisible" />
    </LinearLayout>


    <ListView
        android:id="@+id/lv_Objekte"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_weight="0.42"
        tools:listitem="@android:layout/simple_list_item_2" >


    </ListView>


    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom" >


        <Button
            android:id="@+id/cmd_hinzufuegen"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="left"
            android:text="@string/control_text_menu_add" />


        <Button
            android:id="@+id/cmd_speziell"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:text="@string/control_text_menu_spezi_best" />


        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/hello"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:textSize="12dp" />
    </LinearLayout>


</LinearLayout>