Program: 79914
Project: 79914
Buggy source:
@Override public void onCreate(final Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  addPreferencesFromResource(R.xml.preferences);
  final ListPreference selectedFavorite=(ListPreference)findPreference("String_Node_Str");
  final CheckBoxPreference showFavorite=(CheckBoxPreference)findPreference("String_Node_Str");
  AppDatabase settingsDB=AppDatabase.getAppDatabase(getActivity());
  List<Favorite> favorites=settingsDB.favoriteDao().getAll();
  if (favorites.size() == 0) {
    selectedFavorite.setEnabled(false);
    showFavorite.setEnabled(false);
    showFavorite.setChecked(false);
  }
  ArrayList<String> names=new ArrayList<>();
  ArrayList<String> values=new ArrayList<>();
  for (  Favorite favorite : favorites) {
    names.add(favorite.getName());
    values.add(String.valueOf(favorite.getUid()));
  }
  CharSequence[] n=names.toArray(new CharSequence[names.size()]);
  CharSequence[] v=values.toArray(new CharSequence[values.size()]);
  selectedFavorite.setEntries(n);
  selectedFavorite.setEntryValues(v);
  final SharedPreferences settings=PreferenceManager.getDefaultSharedPreferences(getActivity());
  selectedFavorite.setEnabled(settings.getBoolean("String_Node_Str",false));
  showFavorite.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      selectedFavorite.setEnabled(!settings.getBoolean("String_Node_Str",false));
      return true;
    }
  }
);
  checkApiKeyStatus(settings,false);
  final EditTextPreference apiKeyEditText=(EditTextPreference)findPreference("String_Node_Str");
  final Context context=getActivity().getApplicationContext();
  apiKeyEditText.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      final String apiKey=o.toString();
      if (apiKey.equals("String_Node_Str")) {
        SharedPreferences.Editor editor=settings.edit();
        editor.putBoolean("String_Node_Str",false);
        editor.apply();
        checkApiKeyStatus(settings,false);
      }
 else {
        AsyncHttpClient client=new AsyncHttpClient();
        String testURL=String.format("String_Node_Str" + "String_Node_Str",apiKey);
        client.get(testURL,new JsonHttpResponseHandler(){
          @Override public void onSuccess(          int status,          cz.msebera.android.httpclient.Header[] headers,          JSONObject json){
            try {
              String responseString=json.getString("String_Node_Str");
              JSONObject response=new JSONObject(responseString);
              String featuresString=response.getString("String_Node_Str");
              JSONObject features=new JSONObject(featuresString);
              String success=features.getString("String_Node_Str");
              if (success != null) {
                SharedPreferences.Editor editor=settings.edit();
                editor.putBoolean("String_Node_Str",true);
                editor.apply();
                Toast.makeText(context,R.string.api_key_activated,Toast.LENGTH_LONG).show();
                checkApiKeyStatus(settings,false);
              }
            }
 catch (            JSONException e) {
              Toast.makeText(context,R.string.api_key_failed,Toast.LENGTH_LONG).show();
              SharedPreferences.Editor editor=settings.edit();
              editor.putBoolean("String_Node_Str",false);
              editor.apply();
              checkApiKeyStatus(settings,true);
            }
          }
          @Override public void onFailure(          int status,          cz.msebera.android.httpclient.Header[] h,          Throwable t,          JSONObject e){
            Toast.makeText(context,R.string.connection_error,Toast.LENGTH_LONG).show();
          }
        }
);
      }
      return true;
    }
  }
);
  final ListPreference resEdit=(ListPreference)findPreference("String_Node_Str");
  final EditTextPreference custom=(EditTextPreference)findPreference("String_Node_Str");
  checkResolution(settings.getString("String_Node_Str",getString(R.string.image_resolution_default)),custom);
  resEdit.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      checkResolution(o.toString(),custom);
      return true;
    }
  }
);
  custom.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      String newValue=o.toString();
      if (newValue.matches("String_Node_Str")) {
        int value=Integer.parseInt(newValue);
        if (value >= 100 && value <= 4096)         return true;
      }
      Toast.makeText(context,getString(R.string.custom_resolution_error),Toast.LENGTH_LONG).show();
      return false;
    }
  }
);
}

Fixed version (ground truth):
@Override public void onCreate(final Bundle savedInstanceState){
  super.onCreate(savedInstanceState);
  addPreferencesFromResource(R.xml.preferences);
  final ListPreference selectedFavorite=(ListPreference)findPreference("String_Node_Str");
  final CheckBoxPreference showFavorite=(CheckBoxPreference)findPreference("String_Node_Str");
  AppDatabase settingsDB=AppDatabase.getAppDatabase(getActivity());
  List<Favorite> favorites=settingsDB.favoriteDao().getAll();
  if (favorites.size() == 0) {
    selectedFavorite.setEnabled(false);
    showFavorite.setEnabled(false);
    showFavorite.setChecked(false);
  }
  ArrayList<String> names=new ArrayList<>();
  ArrayList<String> values=new ArrayList<>();
  for (  Favorite favorite : favorites) {
    names.add(favorite.getName());
    values.add(String.valueOf(favorite.getUid()));
  }
  CharSequence[] n=names.toArray(new CharSequence[names.size()]);
  CharSequence[] v=values.toArray(new CharSequence[values.size()]);
  selectedFavorite.setEntries(n);
  selectedFavorite.setEntryValues(v);
  final SharedPreferences settings=PreferenceManager.getDefaultSharedPreferences(getActivity());
  selectedFavorite.setEnabled(settings.getBoolean("String_Node_Str",false));
  showFavorite.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      selectedFavorite.setEnabled(!settings.getBoolean("String_Node_Str",false));
      return true;
    }
  }
);
  checkApiKeyStatus(settings,false,false);
  final EditTextPreference apiKeyEditText=(EditTextPreference)findPreference("String_Node_Str");
  final Context context=getActivity().getApplicationContext();
  apiKeyEditText.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      final String apiKey=o.toString();
      if (apiKey.equals("String_Node_Str")) {
        SharedPreferences.Editor editor=settings.edit();
        editor.putBoolean("String_Node_Str",false);
        editor.apply();
        checkApiKeyStatus(settings,false,false);
      }
 else {
        AsyncHttpClient client=new AsyncHttpClient();
        String testURL=String.format("String_Node_Str" + "String_Node_Str",apiKey);
        client.get(testURL,new JsonHttpResponseHandler(){
          @Override public void onSuccess(          int status,          cz.msebera.android.httpclient.Header[] headers,          JSONObject json){
            try {
              String responseString=json.getString("String_Node_Str");
              JSONObject response=new JSONObject(responseString);
              String featuresString=response.getString("String_Node_Str");
              JSONObject features=new JSONObject(featuresString);
              String success=features.getString("String_Node_Str");
              if (success != null) {
                SharedPreferences.Editor editor=settings.edit();
                editor.putBoolean("String_Node_Str",true);
                editor.apply();
                Toast.makeText(context,R.string.api_key_activated,Toast.LENGTH_LONG).show();
                checkApiKeyStatus(settings,false,true);
              }
            }
 catch (            JSONException e) {
              Toast.makeText(context,R.string.api_key_failed,Toast.LENGTH_LONG).show();
              SharedPreferences.Editor editor=settings.edit();
              editor.putBoolean("String_Node_Str",false);
              editor.apply();
              checkApiKeyStatus(settings,true,true);
            }
          }
          @Override public void onFailure(          int status,          cz.msebera.android.httpclient.Header[] h,          Throwable t,          JSONObject e){
            Toast.makeText(context,R.string.connection_error,Toast.LENGTH_LONG).show();
          }
        }
);
      }
      return true;
    }
  }
);
  final ListPreference resEdit=(ListPreference)findPreference("String_Node_Str");
  final EditTextPreference custom=(EditTextPreference)findPreference("String_Node_Str");
  checkResolution(settings.getString("String_Node_Str",getString(R.string.image_resolution_default)),custom);
  resEdit.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      checkResolution(o.toString(),custom);
      return true;
    }
  }
);
  custom.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener(){
    @Override public boolean onPreferenceChange(    Preference preference,    Object o){
      String newValue=o.toString();
      if (newValue.matches("String_Node_Str")) {
        int value=Integer.parseInt(newValue);
        if (value >= 100 && value <= 4096)         return true;
      }
      Toast.makeText(context,getString(R.string.custom_resolution_error),Toast.LENGTH_LONG).show();
      return false;
    }
  }
);
}