Android ListView 不通过 Filter 刷新

Question

在我的应用程序中，我有三个带有 ViewPager 的 fragment 。其中一个 fragment 我有简单的 Arraylist 作为电话联系人列表中的 ListView，我试图在输入 edittext 后对其进行过滤。但在 softkeyboard 可见之前不会刷新，我必须隐藏键盘才能通过过滤的字符串刷新 ListView 。

例如:

按“a”过滤 ListView :

adapter.getFilter().filter("a");

我的适配器:

public class AdapterContacts extends BaseAdapter implements Filterable {

    private LayoutInflater inflater;
    private Context context;
    private List<ContactLists> categoryArrayList;
    private final ArrayList<ContactLists> originalList = new ArrayList<ContactLists>();
    private NameFilter filter;

    public AdapterContacts(ArrayList<ContactLists> array) {
        categoryArrayList = array;
    }

    public AdapterContacts(Context context, List<ContactLists> array) {
        this.context = context;
        inflater = LayoutInflater.from(this.context);
        categoryArrayList = array;
        originalList.addAll(array);
    }

    @Override
    public int getCount() {
        return categoryArrayList.size();
    }

    @Override
    public ContactLists getItem(int position) {
        return categoryArrayList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder mViewHolder;

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.layout_contacts_list_item, null);
            mViewHolder = new ViewHolder(convertView);
            convertView.setTag(mViewHolder);
        } else {
            mViewHolder = (ViewHolder) convertView.getTag();
        }

        ContactLists item = getItem(position);
        mViewHolder.fillItems(this, item, position);

        return convertView;
    }

    private static class UI extends HelperUI {
        public TextView tv_person_nickname_mobile_number;
        public TextView btn_invite_message;
        public ImageView img_contact_image;
        public ImageView imgv_user_rank;
        public TextView tv_contact_name;
        public LinearLayout ll_root;

        public UI(View view) {
            parseUi(view);
        }
    }

    private class ViewHolder {
        private UI UI;

        public ViewHolder(View view) {
            UI = new UI(view);
        }

        public void fillItems(final AdapterContacts adapter, final ContactLists item, final int position) {
            UI.tv_contact_name.setText(item.getContact_name());

            if (item.getStatus() == 1) {
                UI.btn_invite_message.setVisibility(View.GONE);
                UI.imgv_user_rank.setVisibility(View.VISIBLE);

                if (item.getRank() != null || !TextUtils.isEmpty(item.getRank())) {
                    //Picasso.with(G.context).load(item.getRank()).into(UI.imgv_user_rank);
                }

                UI.tv_person_nickname_mobile_number.setText(item.getNick_name());
                //UI.ll_root.setBackgroundDrawable(G.context.getResources().getDrawable(R.drawable.selector_button_actions));
                if (item.getContact_image() == null || TextUtils.isEmpty(item.getContact_image())) {
                    Bitmap bitmap = UC.getContactPhoto(item.getMobile_number(), G.context.getContentResolver());
                    if (bitmap != null) {
                        UI.img_contact_image.setImageBitmap(bitmap);
                    } else {
                        UI.img_contact_image.setImageDrawable(G.context.getResources().getDrawable(R.drawable.no_avatar));
                    }
                } else {
                    // show user avatar from web
                    //Picasso.with(G.context).load(item.getContact_image()).into(UI.img_contact_image);
                    UI.img_contact_image.setImageBitmap(BitmapFactory.decodeFile(G.dir_image + "/" + item.getContact_image()));
                }
            } else {
                // UI.ll_root.setBackgroundDrawable(G.context.getResources().getDrawable(R.drawable.selector_invite_actions));
                UI.btn_invite_message.setVisibility(View.VISIBLE);
                UI.imgv_user_rank.setVisibility(View.GONE);
                UI.btn_invite_message.setText(UC.getString(R.string.invite_person));
                UI.btn_invite_message.setBackgroundDrawable(G.context.getResources().getDrawable(R.drawable.shape_invite_button_default));
                UI.tv_person_nickname_mobile_number.setText(item.getMobile_number());
                Bitmap bitmap = UC.getContactPhoto(item.getMobile_number(), G.context.getContentResolver());
                if (bitmap != null) {
                    UI.img_contact_image.setImageBitmap(bitmap);
                } else {
                    UI.img_contact_image.setImageDrawable(G.context.getResources().getDrawable(R.drawable.no_avatar));
                }
            }
        }
    }

    @Override
    public Filter getFilter() {
        if (filter == null) {
            filter = new NameFilter();
        }
        return filter;
    }

    public class NameFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();

            String searchText = constraint.toString().toLowerCase();
            ArrayList<ContactLists> newList = filterListBasedOnSearchText(searchText);
            results.values = newList;
            results.count = newList.size();

            return results;
        }

        private ArrayList<ContactLists> filterListBasedOnSearchText(String constraint) {
            ArrayList<ContactLists> newList = new ArrayList<ContactLists>();

            int l = originalList.size();
            for (int i = 0; i < l; i++) {
                ContactLists nameList = originalList.get(i);

                if (nameList.getContact_name().toString().contains(constraint)) {
                    newList.add(nameList);
                }
            }

            return newList;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,
                FilterResults results) {
            categoryArrayList = (ArrayList<ContactLists>) results.values;
            notifyDataSetChanged();
        }
    }
}

ActivityMain list 中的软键盘状态状态。此类具有包含三个 fragment 的 View 寻呼机:

    <activity android:name=".Activities.ActivityBootstrap" android:windowSoftInputMode="adjustPan"  android:screenOrientation="portrait"/>

在没有 Adapter 能力的情况下，在 fragment 中进行 Filter 的其他方法

edt_sample.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        String text = edt_sample.getText().toString();
        filter(text);
    }
});

public void filter(String charText) {
    drinks.clear();
    if (charText.length() == 0) {
        drinks.addAll(contact_list);
    } else {
        for (ContactLists wp : contact_list) {
            if (wp.getContact_name().contains(charText)) {
                drinks.add(wp);
            }
        }
    }
    contact_list.clear();
    contact_list.addAll(drinks);
    adapter.notifyDataSetChanged();
}

当我关闭或隐藏用 nw 项刷新的软键盘时，ListView 成功过滤。

Answer 1

正如我从您发布的代码中看到的那样，您没有使用适配器过滤器。我将在此处发布一个示例过滤器以及如何调用它(保留所有变量名称以使其更容易)。

适配器类中的“NameFilter”类:

public class NameFilter extends Filter {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        FilterResults results = new FilterResults();

        String searchText = constraint.toString().toLowerCase();
        ArrayList<ContactLists> newList = filterListBasedOnSearchText(searchText);
        results.values = newList;
        results.count = newList.size();

        return results;
    }

    private ArrayList<ContactLists> filterListBasedOnSearchText(String constraint) {
        ArrayList<ContactLists> newList = new ArrayList<ContactLists>();

        int l = originalList.size();
        for (int i = 0; i < l; i++) {
            ContactLists nameList = originalList.get(i);

            if (nameList.getContact_name().toString().contains(constraint)) {
                newList.add(nameList);
            }
        }

        return newList;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint,
            FilterResults results) {
        categoryArrayList = (ArrayList<ContactLists>) results.values;
        notifyDataSetChanged();
    }
}

列表 fragment 中的“TextWatcher”接口(interface)方法实现:

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

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

public void afterTextChanged(Editable s) {
    String text = searchView.getText().toString();
    NameFilter itemFilter = (NameFilter) adapter.getFilter();
    itemFilter.filter(text);
}

此外，一些观察结果:

• 如果“ContactLists”是一个联系人，将其命名为“Contact”，以避免混淆
• 我会使用“SearchView”，而不是“EditText”
• 我不知道你是怎么得到联系人列表的，但是有一个关于它的指南here (如果你还没有看过的话)