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android - ArrayAdapter.getItem java.lang.IndexOutOfBoundsException：索引：1，大小：1

问题描述

我创建了一个 Android 应用程序。我有一个活动，用户输入国家名称，自动完成显示国家列表。该列表是通过 HTTP REST 请求获取的。

这是自动完成的屏幕截图：

在此处输入图像描述

它工作正常，但有时（通常当我只输入 2 个字符时）我得到了这个异常，并且从堆栈跟踪中我无法弄清楚问题来自哪里：

2019-11-13 22:13:02.556 18726-18726/it.test.mobile E/it.test.mobil: Invalid ID 0x00000000.
2019-11-13 22:13:02.627 18726-18726/it.test.mobile E/it.test.mobil: Invalid ID 0x00000000.
2019-11-13 22:13:02.768 18726-18726/it.test.mobile E/AndroidRuntime: FATAL EXCEPTION: main
    Process: it.test.mobile, PID: 18726
    java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
        at java.util.ArrayList.get(ArrayList.java:437)
        at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:393)
        at android.widget.AutoCompleteTextView.buildImeCompletions(AutoCompleteTextView.java:1243)
        at android.widget.AutoCompleteTextView.showDropDown(AutoCompleteTextView.java:1203)
        at android.widget.AutoCompleteTextView.updateDropDownForFilter(AutoCompleteTextView.java:1086)
        at android.widget.AutoCompleteTextView.onFilterComplete(AutoCompleteTextView.java:1068)
        at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:285)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

这是我的适配器：

public class CountryAdapter extends ArrayAdapter<Country> {
    private Activity activity;
    private ArrayList<Country> countryList = new ArrayList<>();
    public Resources res;
    LayoutInflater inflater;
    private String TAG = "CountryAdapter";

    /*************  CustomAdapter Constructor *****************/
    public CountryAdapter(Activity activity, int textViewResourceId, ArrayList<Country> objects, Resources resLocal) {
        super(activity, textViewResourceId, objects);
        try {
            activity = activity;
            if (objects != null)
                countryList = objects;
            res = resLocal;
            /***********  Layout inflator to call external xml layout () **********************/
            inflater = (LayoutInflater) activity.getSystemService(getContext().LAYOUT_INFLATER_SERVICE);
        } catch (Exception e) {
            e.printStackTrace();
            Logcat.e(TAG, "Errore: " + e.toString());
        }
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        try {
            return getCustomView(position, convertView, parent);
        } catch (Exception e) {
            e.printStackTrace();
            Logcat.e(TAG, "Errore: " + e.toString());
        }
        return null;
    }

    @Override
    public int getCount() {
        if (countryList != null)
            return countryList.size();
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        return getCustomView(position, convertView, parent);
    }

    // This funtion called for each row ( Called data.size() times )
    public View getCustomView(int position, View convertView, ViewGroup parent) {
        try {
            /********** Inflate spinner_rows.xml file for each row ( Defined below ) ************/
            View row = inflater.inflate(R.layout.layout_item_country, parent, false);

            /***** Get each Model object from Arraylist ********/


            return row;
        } catch (Exception e) {
            e.printStackTrace();
            Logcat.e(TAG, "Errore: " + e.toString());
        }
        return null;
    }
}

这是更新适配器的代码：

public class GetCountry extends AsyncTask<Object, Integer, JSONObject> {

private AutoCompleteTextView autocomplete;

@Override
protected JSONObject doInBackground(Object... params) {
    try {
        JSONParser jParser = new JSONParser(AddFinesActivity.this);
        String url = UtilityFunctions.getBaseUrl(AddFinesActivity.this) + Globle.GET_COUNTRY + params[0];
        autocomplete = (AutoCompleteTextView) params[1];
        Logcat.d(TAG, "doInBackground: url :" + url);

        json = jParser.getJSONFromUrl(url, JSONParser.GET, UtilityFunctions.getToken(AddFinesActivity.this), UtilityFunctions.getLanguage());
        return json;
    } catch (Exception e) {
        Logcat.d(TAG, e.getMessage());
        e.printStackTrace();
    }
    return null;
}

@Override
protected void onPostExecute(final JSONObject result) {
    if (result != null) {
        try {
            JSONObject object = result.getJSONObject("_embedded");
            countryArray = object.getJSONArray("countries");
            //reset the list
            countryArrayList.clear();
            if (countryArray != null && countryArray.length() > 0) {
                for (int i = 0; i < countryArray.length(); i++) {
                    JSONObject c = countryArray.getJSONObject(i);
                    countryArrayList.add(Country.getCountryFromJson(c));
                }
            }


            mCountryAdapter = new CountryAdapter(AddFinesActivity.this, R.layout.layout_item_country, countryArrayList, getResources()) {
                @Override
                public View getView(final int position, View convertView, ViewGroup parent) {
                    View view = super.getView(position, convertView, parent);
                    TextView mTextViewName = (TextView) view.findViewById(R.id.text_view_name);
                    TextView mTextCode = (TextView) view.findViewById(R.id.text_view_code);
                    ImageView mImageView = (ImageView) view.findViewById(R.id.image_country);

                    if (countryArrayList != null && countryArrayList.size() > 0) {
                        mTextViewName.setText("" + countryArrayList.get(position).getName());
                        mTextCode.setText("" + "(" + countryArrayList.get(position).getAlpha2Code() + ")");
                        try {
                            mImageView.setImageDrawable(FlagKit.drawableWithFlag(getContext(), countryArrayList.get(position).getAlpha2Code().toLowerCase()));
                        } catch (Resources.NotFoundException e) {
                            //if the flag is not found is not a problem
                        }
                    }

                    view.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {


                            if (autocomplete.equals(mEditTextCountry)) {
                                contactCountryLink = countryArrayList.get(position).getLink().getSelf();
                                contactCountryName = countryArrayList.get(position).getName();
                                setContactCountryName(position);
                            } else if (autocomplete.equals(mEditTextLicensePlateCountry)) {
                                licensePlateCountryLink = countryArrayList.get(position).getLink().getSelf();
                                licensePlateCountryName = countryArrayList.get(position).getName();
                                setLicensePlateCountryName(position);
                            }
                        }
                    });
                    return view;
                }
            };
            if (mCountryAdapter != null) {
                mEditTextCountry.setAdapter(mCountryAdapter);
                mEditTextLicensePlateCountry.setAdapter(mCountryAdapter);
                mCountryAdapter.notifyDataSetChanged();
            }
        } catch(Exception e) {
            e.printStackTrace();
            Logcat.e(TAG, "Errore: " + e.toString());
        }
    }


}

}

我正在寻找第 393 行，ArrayAdapter.java但我没有看到它。有什么提示可以理解引发异常的地方吗？

==== 解决方案 ======

最后我按照本教程解决了：https ://ridwanolalere.wordpress.com/2015/07/04/how-to-implement-auto-complete-in-android-with-remote-server-data/

我希望它可以帮助

标签： android

解决方案

很难理解并且需要调试，但我认为它GetCountry可能会调用多次，您对countryArrayListfromGetCountry和有相同的引用adapter，这意味着countryArrayList在适配器渲染视图时可能会清除和初始化，并且视图的位置可以是 > fromcountryArrayList尺寸。因此，也许尝试countryList在 adaper中隔离，countryList.clear()而不是countryList.addAll(objects)在adapter构造函数中分配使用。

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