Program: 109677
Project: 109677
Buggy source:
@Override public Dialog onCreateDialog(Bundle savedInstanceState){
  AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
  LayoutInflater inflater=getActivity().getLayoutInflater();
  View new_provider_dialog_view=inflater.inflate(R.layout.new_provider_dialog,null);
  final EditText url_input_field=(EditText)new_provider_dialog_view.findViewById(R.id.new_provider_url);
  final CheckBox danger_checkbox=(CheckBox)new_provider_dialog_view.findViewById(R.id.danger_checkbox);
  builder.setView(new_provider_dialog_view).setMessage(R.string.introduce_new_provider).setPositiveButton(R.string.save,new DialogInterface.OnClickListener(){
    public void onClick(    DialogInterface dialog,    int id){
      String entered_url=url_input_field.getText().toString().trim();
      if (!entered_url.startsWith("String_Node_Str")) {
        entered_url="String_Node_Str".concat(entered_url);
      }
      boolean danger_on=danger_checkbox.isChecked();
      if (validURL(entered_url)) {
        interface_with_ConfigurationWizard.saveAndSelectProvider(entered_url,danger_on);
        Toast.makeText(getActivity().getApplicationContext(),R.string.valid_url_entered,Toast.LENGTH_LONG).show();
      }
 else {
        url_input_field.setText("String_Node_Str");
        Toast.makeText(getActivity().getApplicationContext(),R.string.not_valid_url_entered,Toast.LENGTH_LONG).show();
      }
    }
  }
).setNegativeButton(R.string.cancel,new DialogInterface.OnClickListener(){
    public void onClick(    DialogInterface dialog,    int id){
      dialog.cancel();
    }
  }
);
  return builder.create();
}

Fixed version (ground truth):
@Override public Dialog onCreateDialog(Bundle savedInstanceState){
  AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
  LayoutInflater inflater=getActivity().getLayoutInflater();
  View new_provider_dialog_view=inflater.inflate(R.layout.new_provider_dialog,null);
  final EditText url_input_field=(EditText)new_provider_dialog_view.findViewById(R.id.new_provider_url);
  final CheckBox danger_checkbox=(CheckBox)new_provider_dialog_view.findViewById(R.id.danger_checkbox);
  builder.setView(new_provider_dialog_view).setMessage(R.string.introduce_new_provider).setPositiveButton(R.string.save,new DialogInterface.OnClickListener(){
    public void onClick(    DialogInterface dialog,    int id){
      String entered_url=url_input_field.getText().toString().trim();
      if (!entered_url.startsWith("String_Node_Str")) {
        if (entered_url.startsWith("String_Node_Str")) {
          entered_url=entered_url.substring("String_Node_Str".length());
        }
        entered_url="String_Node_Str".concat(entered_url);
      }
      boolean danger_on=danger_checkbox.isChecked();
      if (validURL(entered_url)) {
        interface_with_ConfigurationWizard.saveAndSelectProvider(entered_url,danger_on);
        Toast.makeText(getActivity().getApplicationContext(),R.string.valid_url_entered,Toast.LENGTH_LONG).show();
      }
 else {
        url_input_field.setText("String_Node_Str");
        danger_checkbox.setChecked(false);
        Toast.makeText(getActivity().getApplicationContext(),R.string.not_valid_url_entered,Toast.LENGTH_LONG).show();
        ;
      }
    }
  }
).setNegativeButton(R.string.cancel,new DialogInterface.OnClickListener(){
    public void onClick(    DialogInterface dialog,    int id){
      dialog.cancel();
    }
  }
);
  return builder.create();
}