如果搜索查询在搜索视图中不匹配，如何为回收者视图设置过滤器 [英] How to set filter for recycler view if search query resulting no match in search view

问题描述

如果我们在搜索视图中输入的项目匹配，但是如果我们输入的查询不匹配，则此代码可以正常工作...应用程序在android中崩溃.

This code works fine if the item we entered in search view matches but if we enter some query which does not match ...application is crashing in android.

这里Main_ATMItemList是返回整个结果列表的列表. 请帮我我需要添加的内容，以便即使查询不匹配，代码也能正常工作.

Here Main_ATMItemList is the list in which whole list of results are returned. Please help me what I need to add so that the code works even the query does not match.

我已经在适配器类中创建了此方法

I have created this method in adapter class

public void setFilter(String queryText) {
        visibleObjects = new ArrayList<>();

            for (RouteByATMList.Route_ATM item : Main_ATMItemList) {
                if (item.ATMNumber.startsWith(queryText))
                {
                    visibleObjects.add(item);

                }
            }
        }

        notifyDataSetChanged();
        Log.e("dataset changed","dataset changed");
    }

推荐答案

始终使用此功能对我有用

Use this works for me all time

private List<ExampleModel> filter(List<ExampleModel> models, String query) {
    query = query.toLowerCase();

    final List<ExampleModel> filteredModelList = new ArrayList<>();
    for (ExampleModel model : models) {
        final String text = model.getText().toLowerCase();
        if (text.contains(query)) {
            filteredModelList.add(model);
        }
    }
    return filteredModelList;
}

然后onQueryTextChange(String query)调用过滤器

Then onQueryTextChange(String query) call the filter

final List<ExampleModel> filteredModelList = filter(mModels, query);
        mAdapter.animateTo(filteredModelList);
        mRecyclerView.scrollToPosition(0);

下面是在适配器中找到的animateTo方法

below is the animateTo method found in the Adapter

 public void animateTo(List<ExampleModel> models) {
        applyAndAnimateRemovals(models);
        applyAndAnimateAdditions(models);
        applyAndAnimateMovedItems(models);
    }

private void applyAndAnimateRemovals(List<ExampleModel> newModels) {
    for (int i = mModels.size() - 1; i >= 0; i--) {
        final ExampleModel model = mModels.get(i);
        if (!newModels.contains(model)) {
            removeItem(i);
        }
    }
}

private void applyAndAnimateAdditions(List<ExampleModel> newModels) {
    for (int i = 0, count = newModels.size(); i < count; i++) {
        final ExampleModel model = newModels.get(i);
        if (!mModels.contains(model)) {
            addItem(i, model);
        }
    }
}

private void applyAndAnimateMovedItems(List<ExampleModel> newModels) {
    for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) {
        final ExampleModel model = newModels.get(toPosition);
        final int fromPosition = mModels.indexOf(model);
        if (fromPosition >= 0 && fromPosition != toPosition) {
            moveItem(fromPosition, toPosition);
        }
    }
}

public ExampleModel removeItem(int position) {
    final ExampleModel model = mModels.remove(position);
    notifyItemRemoved(position);
    return model;
}

public void addItem(int position, ExampleModel model) {
    mModels.add(position, model);
    notifyItemInserted(position);
}

public void moveItem(int fromPosition, int toPosition) {
    final ExampleModel model = mModels.remove(fromPosition);
    mModels.add(toPosition, model);
    notifyItemMoved(fromPosition, toPosition);
}

}

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