Fehler beim HInzufügen neuer Controls auf einer View

Hallo,

ich will bei Textänderungen eine Liste in einem LinearLayout ausgeben mit Suchergebnissen.
Leider stürt bei meinem Code die App nach Input ins Textfeld ab.
Kann mir jemand sagen, woran das liegt? thx

[code=java]
public void show_city_search(View view)
{
setContentView(R.layout.city_search);

final EditText txtSearch = (EditText)findViewById(R.id.txtSearch);
final LinearLayout lytCities = (LinearLayout)findViewById(R.id.lytCities);

txtSearch.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {

for(Data.City city: getData.FindCity(txtSearch.getText()))
{
Button btn = new Button(null);
btn.setText(city.Postcode + " " + city.Name);

lytCities.addView(btn);
}

}

public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count) {

}
});
[code=java]

Also die Methode solle immer Daten liefern:

public List<City> FindCity(Editable editable) {
List<City> cities = new ArrayList<City>();

cities.add(new City("35434", "htrshse "));
cities.add(new City("34568", "srdg hewzh"));
cities.add(new City("78645", "dsfheszh"));
cities.add(new City("37837", "sdzgsgd"));
cities.add(new City("07860", "esrh seh"));

return cities;
}

Zum LogCat Eintrag habe ich keinen Anhaltspunkt gefunden, der mir den Fehler erklären könnte:

03-29 19:55:31.329: W/dalvikvm(1325): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
03-29 19:55:31.339: E/AndroidRuntime(1325): FATAL EXCEPTION: main
03-29 19:55:31.339: E/AndroidRuntime(1325): java.lang.NullPointerException
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewConfiguration.get(ViewConfiguration.java:211)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.View.<init>(View.java:1814)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.View.<init>(View.java:1856)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.TextView.<init>(TextView.java:327)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.Button.<init>(Button.java:69)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.Button.<init>(Button.java:65)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.Button.<init>(Button.java:61)
03-29 19:55:31.339: E/AndroidRuntime(1325): at test.test.TestActivity$1.afterTextChanged(TestActivity.java:54)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.TextView.sendAfterTextChanged(TextView.java:6145)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:6328)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.SpannableStringBuilder.sendTextHasChanged(SpannableStringBuilder.java:897)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:353)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:269)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:432)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:409)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:28)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:195)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:132)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.TextView.doKeyDown(TextView.java:4304)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.widget.TextView.onKeyDown(TextView.java:4149)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.KeyEvent.dispatch(KeyEvent.java:1037)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.View.dispatchKeyEvent(View.java:3740)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
03-29 19:55:31.339: E/AndroidRuntime(1325): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1667)
03-29 19:55:31.339: E/AndroidRuntime(1325): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1102)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.app.Activity.dispatchKeyEvent(Activity.java:2063)
03-29 19:55:31.339: E/AndroidRuntime(1325): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.view.ViewRoot.handleMessage(ViewRoot.java:1735)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.os.Handler.dispatchMessage(Handler.java:99)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.os.Looper.loop(Looper.java:123)
03-29 19:55:31.339: E/AndroidRuntime(1325): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-29 19:55:31.339: E/AndroidRuntime(1325): at java.lang.reflect.Method.invokeNative(Native Method)
03-29 19:55:31.339: E/AndroidRuntime(1325): at java.lang.reflect.Method.invoke(Method.java:521)
03-29 19:55:31.339: E/AndroidRuntime(1325): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-29 19:55:31.339: E/AndroidRuntime(1325): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-29 19:55:31.339: E/AndroidRuntime(1325): at dalvik.system.NativeStart.main(Native Method)

Gibts da einen Hinweis was es sein könnte in dem Log, wenn ja wo genau? thx