为什么我的 ArrayList 不存储我的 EditText 条目而只是显示它们

Question

我有一个FragmentStatePager，两个EditText 和一个自定义ListView。 用户可以进行两个输入并单击Button，它们将被添加到ListView，但它们不会存储在ListView 中。ListView 包含ArrayList。

我希望EditText 的输入将存储在ArrayList 中。

有人能写出怎么做吗？

---

我的onCreateView

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        ViewGroup rootView = (ViewGroup) inflater.inflate(
                R.layout.swipeview, container, false);
        txtTitel = (TextView) rootView.findViewById(R.id.swipeviewtitle);


        // Capture position and set to the TextViews
        txtTitel.setText(titel[position]);


        // Locate the ImageView in viewpager_item.xml
        image = (ImageView) rootView.findViewById(R.id.swipeViewimage);
        // Capture position and set to the ImageView

        String title = titel[position];
        Integer imageRes = TITLE_IMAGES.get(title);
        if (imageRes == null) { // not found in map
            image.setImageResource(0);
        } else {
            image.setImageResource(imageRes);
        }


        final ListView listView = (ListView) rootView.findViewById(R.id.listViewswipeview);
        final EditText wdhedittext = (EditText) rootView.findViewById(R.id.editTextswipeView);
        final EditText kgedittext = (EditText) rootView.findViewById(R.id.editText2);
        final Button btnswipeview = (Button) rootView.findViewById(R.id.imagebuttonswipeview);





        adapter2 = new CustomListViewAdapter2(getActivity(),
                R.layout.swipeviewrowitem, rowItems);
        listView.setAdapter(adapter2);



        btnswipeview.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View View) {

                if (wdhedittext.getText().toString().matches("")) {
                    Toast toast = Toast.makeText(getActivity(),
                            "Bitte Wiederholungszahl angeben",
                            Toast.LENGTH_SHORT);
                    toast.show();
                } else if (kgedittext.getText().toString().matches("")) {
                    final rowitem2 item = new rowitem2(wdhedittext.getText().toString() + "wdh", kgedittext.getText().toString());

                    adapter2.add(item);
                    rowItems.add(item);

                } else {
                    final rowitem2 item = new rowitem2(wdhedittext.getText().toString() + "wdh", kgedittext.getText().toString() + "kg");
                    adapter2.add(item);
                    rowItems.add(item);

                /*String name = wdhedittext.getText().toString();
                int rowId = workoutDBAO2.addWorkout2(name);
                HashMap rowValsSets = new HashMap();
                rowValsSets.put("sets", name);
                rowValsSets.put("id", rowId);
                adapter3.add(rowValsSets);*/
                }


            }
        });


        rowItems = new ArrayList<rowitem2>();


        return rootView;
    }

CustomListViewAdapter2 和 rowitem2 类

class CustomListViewAdapter2 extends ArrayAdapter<rowitem2> {


        private final ArrayList<rowitem2> items;
        Context context;

        public CustomListViewAdapter2(Context context, int resourceId,
                                      ArrayList<rowitem2> items) {
            super(context, resourceId, items);
            this.context = context;
            this.items=items;
        }



        public View getView(int position, View convertView, ViewGroup parent) {
            rowitem2 rowItem = items.get(position);

            LayoutInflater mInflater = (LayoutInflater) context
                    .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
                View view = mInflater.inflate(R.layout.swipeviewrowitem, null);
                TextView txtTitle = (TextView) view.findViewById(R.id.mainText2);
                TextView txtDesc = (TextView) view.findViewById(R.id.textView2);

            txtDesc.setText(rowItem.getDesc());
            txtTitle.setText(rowItem.getTitle());


            return view;
        }
        @Override
        public boolean areAllItemsEnabled() {
            return true;
        }

    }
}
class rowitem2 {

        private String edittexttitle;
        private String edittexttitle2;

        public rowitem2(String title, String desc) {
            this.edittexttitle = title;
            this.edittexttitle2 = desc;
        }

        public String getTitle() {
            return edittexttitle;
        }

        public String getDesc() {
            return edittexttitle2;
        }

        public void setTitle(String title) {
            this.edittexttitle = title;
        }

        @Override
        public String toString() {
            return edittexttitle + "\n" + edittexttitle2;
        }


    }

Answer 1

添加项目后的 dapter2.notifyDataSetChanged() 将完成工作。

Answer 2

您不能在ArrayList 中保留任何数据。如果您想永久存储它们，您应该使用SQLite database 或SharedPreferences。

Here 是一个很好的例子，说明如何使用 SQLite 数据库解决您的问题。如果您计划存储和管理大量数据，这将非常有用。

如果您不打算存储大量数据，使用SharedPreferences 将是一个不错的选择。例如：

//Store a String in SharedPreferences 
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("your_key", your_string_variable);

无论何时你想检索它（例如，onResume 或 onCreate）

 // Restore preferences
 SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
 String your_string_variable = settings.getString("your_key", "default_value");

更多关于 SharedPreferences 的信息可以在here找到。