搜索在Android的ListView的项目后，一定要打开的ListView的第一个项目（问题） [英] After searching for ListView items in Android, always open first item of ListView (Issue)

问题描述

当我打开搜索到的项目，它是开放的ListView的第一个项目不是搜索之一。即使搜索和successfuly找到的物品。

When I opened the searched item, it is opening the first item of ListView not the searched one. Even if search and find the items successfuly.

让我举的例子：

• 如果我搜索箭头，我可以得到箭头但当点击箭它是将几乎人，几乎人是ListView的<我的第一个项目/ LI>
• 如果我搜索美国我收到的美国人（第一）和美国恐怖故事（二）（两个结果） 搜索proccess是成功的，但如果点击美国人（第二个）它去的ListView的第二个项目。

• If I search for Arrow, I can get the Arrow but when clicked Arrow it is going to Almost Human, Almost Human is my first item of ListView
• If I search for American I'm getting The Americans (first) and American Horror Story (second) ( two results ) search proccess is successful but if click The Americans (second one) it goes to second item of ListView.

我在想什么？

我的搜索code：

    search.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
            // When user changed the Text
            MainActivity.this.adapter.getFilter().filter(cs);   
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub                          
        }
    });
}

这里是CustomListViewAdapter.java

    public class CustomListViewAdapter extends ArrayAdapter<RowItem> {
Context context;

public CustomListViewAdapter(Context context, int resourceId,
        List<RowItem> items) {
    super(context, resourceId, items);
    this.context = context;
}

/* private view holder class */
private class ViewHolder {
    ImageView imageView;
    TextView txtTitle;
    TextView txtDesc;
}

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    RowItem rowItem = getItem(position);    

    LayoutInflater mInflater = (LayoutInflater) context
            .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_item, null);
        holder = new ViewHolder();
        holder.txtDesc = (TextView) convertView.findViewById(R.id.desc);
        holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
        holder.imageView = (ImageView) convertView.findViewById(R.id.icon);
        convertView.setTag(holder);
    } else
        holder = (ViewHolder) convertView.getTag();

    holder.txtDesc.setText(rowItem.getDesc());
    holder.txtTitle.setText(rowItem.getTitle());
    // holder.imageView.setImageBitmap(rowItem.getImageId());

    ImageView img = (ImageView) convertView.findViewById(R.id.icon);
    ImageView gif = (ImageView) convertView.findViewById(R.id.icon);
    // UrlImageViewHelper.loadUrlDrawable(context, rowItem.getImageId());

    Ion.with(gif).load("http://www.example.com/wp-content/uploads/2014/03/android-icon/loading.gif");
    Drawable drawable=gif.getDrawable();
    UrlImageViewHelper.setUrlDrawable(img, rowItem.getImageId(),drawable,
            600000);
    return convertView;
}
    }

RowItem.java

        public class RowItem<T> {
        private String imageId;
        private String title;
        private String desc;

        public RowItem(String imageId, String title, String desc) {
            this.imageId = imageId;
            this.title = title;
            this.desc = desc;
        }
        public String getImageId() {
            return imageId;
        }
        public void setImageId(String imageId) {
            this.imageId = imageId;
        }
        public String getDesc() {
            return desc;
        }
        public void setDesc(String desc) {
            this.desc = desc;
        }
        public String getTitle() {
            return title;
        }
        public void setTitle(String title) {
            this.title = title;
        }
        @Override
        public String toString() {
            return title + "\n" + desc;
        }
    }   

MainActiviy.java

            protected void onCreate(Bundle onSaveInstanceState ) {
    super.onCreate(onSaveInstanceState );
    setContentView(R.layout.activity_main);
        listView.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            // When clicked, Open the Next Screen
            Intent r = new Intent(MainActivity.this, KategoriActivity.class);
            r.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            r.putExtra("cat_img", asd[2][position]);
            r.putExtra("cat_id", asd[1][position]);
            r.putExtra("cat_id2", asd[1][position]);
            r.putExtra("cat_name",asd[0][position]);
            // r.putExtra("cat_img", bit[1][position]);
            startActivityForResult(r, position);


        }

    }); 


    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        try {

            JSONArray jsonResponse = new JSONArray(result);
            asd = new String[3][jsonResponse.length()];
            rowItems = new ArrayList<RowItem>();

            for (int i = 0; i < jsonResponse.length(); i++) {
                JSONObject js = jsonResponse.getJSONObject(i);
                asd[0][i] = js.getString("Category_Name");
                asd[2][i] = js.getString("Image");
                asd[1][i] = js.getString("Term_ID");

                RowItem item = new RowItem(asd[2][i], asd[0][i], "");
                rowItems.add(item);
            }

            adapter = new CustomListViewAdapter(MainActivity.this,
                    R.layout.list_item, rowItems);

            listView.setAdapter(adapter);


        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

希望你能帮助我..

Hope you can help me..

推荐答案

通常情况下，如果你有一个自定义类型的如 RowItem 的ArrayAdapter它不会自动处理过滤为你。毕竟，这怎么能知道 RowItem 的哪些属性进行过滤？你应该重写用getFilter 的方法，并从您的适配器的整体清单单独存放被过滤列表。事情是这样的：

Normally if you have an ArrayAdapter of of a custom type like RowItem it won't automatically handle filtering for you. After all, how can it know which property of RowItem to filter? You should override the getFilter method, and store the filtered list separately from the overall list in your adapter. Something like this:

public class CustomListViewAdapter extends ArrayAdapter<RowItem>
{
    private final ArrayList<RowItem>  mItems;
    private       ArrayList<RowItem>  mFilteredItems;
    private final Comparator<Object> mComparator;

    public CustomListViewAdapter(Context context, int textViewResourceId, List<RowItem> items)
    {
        super(context, textViewResourceId);

        mItems = new ArrayList<RowItem>(items);
        mFilteredItems = new ArrayList<RowItem>(items);
        mComparator = new Comparator<Object>()
        {
            @Override
            public int compare(Object o1, Object o2)
            {
                String s1 = ((RowItem)o1).getTitle();
                String s2 = ((RowItem)o2).getTitle();
                return s1.toLowerCase(Locale.getDefault()).compareTo(s2.toLowerCase());
            }
        };

        Collections.sort(mItems, mComparator);
        Collections.sort(mFilteredItems, mComparator);
    }

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

    @Override
    public RowItem getItem(int position)
    {
        return mFilteredItems.get(position);
    }

    @Override
    public int getPosition(RowItem item)
    {
        return mFilteredItems.indexOf(item);
    }

    @Override
    public Filter getFilter()
    {
        return new Filter()
        {
            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint, FilterResults results)
            {
                mFilteredItems = (ArrayList<RowItem>)results.values;
                if (results.count > 0)
                {
                    notifyDataSetChanged();
                }
                else
                {
                    notifyDataSetInvalidated();
                }
            }

            @Override
            protected FilterResults performFiltering(CharSequence constraint)
            {
                List<RowItem> filteredResults = new ArrayList<RowItem>();
                for (RowItem item : mItems)
                {
                    if (item.getTitle().toLowerCase(Locale.getDefault()).contains(constraint.toString().toLowerCase(Locale.getDefault())))
                    {
                        filteredResults.add(item);
                    }
                }

                Collections.sort(filteredResults, mComparator);
                FilterResults results = new FilterResults();
                results.values = filteredResults;
                results.count = filteredResults.size();

                return results;
            }
        };
    }
}

和在MainActivity：

and in MainActivity:

        RowItem item = adapter.getItem(position)
        r.putExtra("cat_img", item.getImageId());
        r.putExtra("cat_id", item.getTermId());
        r.putExtra("cat_id2", item.getTermId());
        r.putExtra("cat_name", item.getTitle());

您也有一个termid字段添加到RowItem，因为它是在你的JSON响应......

You Also have to add a termid field to RowItem, since it's in your JSON response...

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