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Android AutoCompleteTextView 与自定义适配器过滤不起作用

发布于 2024-12-25 15:35:59 字数 3367 浏览 2 评论 0原文

我有自定义 CustomerAdapter

public class CustomerAdapter extends ArrayAdapter<Customer> {
    private final String MY_DEBUG_TAG = "CustomerAdapter";
    private ArrayList<Customer> items;
    private int viewResourceId;

    public CustomerAdapter(Context context, int viewResourceId, ArrayList<Customer> items) {
        super(context, viewResourceId, items);
        this.items = items;
        this.viewResourceId = viewResourceId;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(viewResourceId, null);
        }
        Customer customer = items.get(position);
        if (customer != null) {
            TextView customerNameLabel = (TextView) v.findViewById(R.id.customerNameLabel);
            if (customerNameLabel != null) {
                customerNameLabel.setText(String.valueOf(customer.getName()));
            }
        }
        return v;
    }
}

和 customer_auto 布局

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/customerNameLabel"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:padding="10dp" android:textSize="16sp" 
    android:textColor="#000">
</TextView>

，并且在我的 public void onCreate

AutoCompleteTextView customerAutoComplete = (AutoCompleteTextView) findViewById(R.id.autocomplete_customer);
CustomerAdapter customerAdapter = new CustomerAdapter(this, R.layout.customer_auto, customerList);
customerAutoComplete.setAdapter(customerAdapter);

和 Customer.java

public class Customer implements Parcelable {

    private int id;
    private String name = "";

    public Customer() {
        // TODO Auto-generated constructor stub
    }

    /**
     * This will be used only by the MyCreator
     * 
     * @param source
     */
    public Customer(Parcel source) {
        /*
         * Reconstruct from the Parcel
         */
        id = source.readInt();
        name = source.readString();
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return this.id;
    }

    public String getName() {
        return this.name;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(id);
        dest.writeString(name);
    }

    public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {

        @Override
        public Customer createFromParcel(Parcel source) {
            return new Customer(source);
        }

        @Override
        public Customer[] newArray(int size) {
            return new Customer[size];
            // TODO Auto-generated method stub
        }

    };

    @Override
    public String toString() {
        return this.name;
    }

}

上，但自动建议框无法正确过滤。例如；如果我在测试框中输入 an，以 br 开头的客户就会出现！

原文

I've the Custom CustomerAdapter

public class CustomerAdapter extends ArrayAdapter<Customer> {
    private final String MY_DEBUG_TAG = "CustomerAdapter";
    private ArrayList<Customer> items;
    private int viewResourceId;

    public CustomerAdapter(Context context, int viewResourceId, ArrayList<Customer> items) {
        super(context, viewResourceId, items);
        this.items = items;
        this.viewResourceId = viewResourceId;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(viewResourceId, null);
        }
        Customer customer = items.get(position);
        if (customer != null) {
            TextView customerNameLabel = (TextView) v.findViewById(R.id.customerNameLabel);
            if (customerNameLabel != null) {
                customerNameLabel.setText(String.valueOf(customer.getName()));
            }
        }
        return v;
    }
}

and customer_auto layout

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/customerNameLabel"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:padding="10dp" android:textSize="16sp" 
    android:textColor="#000">
</TextView>

and on my public void onCreate

AutoCompleteTextView customerAutoComplete = (AutoCompleteTextView) findViewById(R.id.autocomplete_customer);
CustomerAdapter customerAdapter = new CustomerAdapter(this, R.layout.customer_auto, customerList);
customerAutoComplete.setAdapter(customerAdapter);

and Customer.java

public class Customer implements Parcelable {

    private int id;
    private String name = "";

    public Customer() {
        // TODO Auto-generated constructor stub
    }

    /**
     * This will be used only by the MyCreator
     * 
     * @param source
     */
    public Customer(Parcel source) {
        /*
         * Reconstruct from the Parcel
         */
        id = source.readInt();
        name = source.readString();
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return this.id;
    }

    public String getName() {
        return this.name;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(id);
        dest.writeString(name);
    }

    public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {

        @Override
        public Customer createFromParcel(Parcel source) {
            return new Customer(source);
        }

        @Override
        public Customer[] newArray(int size) {
            return new Customer[size];
            // TODO Auto-generated method stub
        }

    };

    @Override
    public String toString() {
        return this.name;
    }

}

But the auto suggest box does not filter correctly. for eg; if i type an in the test box customers starting with br are showing up!

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评论（9）

云淡风轻 2025-01-01 15:35:59

我必须重写 getFilter() 适配器的方法

这是对我有用的代码，感谢 sacoskun

public class CustomerAdapter extends ArrayAdapter<Customer> {
    private final String MY_DEBUG_TAG = "CustomerAdapter";
    private ArrayList<Customer> items;
    private ArrayList<Customer> itemsAll;
    private ArrayList<Customer> suggestions;
    private int viewResourceId;

    public CustomerAdapter(Context context, int viewResourceId, ArrayList<Customer> items) {
        super(context, viewResourceId, items);
        this.items = items;
        this.itemsAll = (ArrayList<Customer>) items.clone();
        this.suggestions = new ArrayList<Customer>();
        this.viewResourceId = viewResourceId;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(viewResourceId, null);
        }
        Customer customer = items.get(position);
        if (customer != null) {
            TextView customerNameLabel = (TextView) v.findViewById(R.id.customerNameLabel);
            if (customerNameLabel != null) {
//              Log.i(MY_DEBUG_TAG, "getView Customer Name:"+customer.getName());
                customerNameLabel.setText(customer.getName());
            }
        }
        return v;
    }

    @Override
    public Filter getFilter() {
        return nameFilter;
    }

    Filter nameFilter = new Filter() {
        @Override
        public String convertResultToString(Object resultValue) {
            String str = ((Customer)(resultValue)).getName(); 
            return str;
        }
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if(constraint != null) {
                suggestions.clear();
                for (Customer customer : itemsAll) {
                    if(customer.getName().toLowerCase().startsWith(constraint.toString().toLowerCase())){
                        suggestions.add(customer);
                    }
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = suggestions;
                filterResults.count = suggestions.size();
                return filterResults;
            } else {
                return new FilterResults();
            }
        }
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            ArrayList<Customer> filteredList = (ArrayList<Customer>) results.values;
            if(results != null && results.count > 0) {
                clear();
                for (Customer c : filteredList) {
                    add(c);
                }
                notifyDataSetChanged();
            }
        }
    };

}

I have to over-ride the getFilter() method of the Adapter

Here is the code which worked for me, thanks to sacoskun

public class CustomerAdapter extends ArrayAdapter<Customer> {
    private final String MY_DEBUG_TAG = "CustomerAdapter";
    private ArrayList<Customer> items;
    private ArrayList<Customer> itemsAll;
    private ArrayList<Customer> suggestions;
    private int viewResourceId;

    public CustomerAdapter(Context context, int viewResourceId, ArrayList<Customer> items) {
        super(context, viewResourceId, items);
        this.items = items;
        this.itemsAll = (ArrayList<Customer>) items.clone();
        this.suggestions = new ArrayList<Customer>();
        this.viewResourceId = viewResourceId;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(viewResourceId, null);
        }
        Customer customer = items.get(position);
        if (customer != null) {
            TextView customerNameLabel = (TextView) v.findViewById(R.id.customerNameLabel);
            if (customerNameLabel != null) {
//              Log.i(MY_DEBUG_TAG, "getView Customer Name:"+customer.getName());
                customerNameLabel.setText(customer.getName());
            }
        }
        return v;
    }

    @Override
    public Filter getFilter() {
        return nameFilter;
    }

    Filter nameFilter = new Filter() {
        @Override
        public String convertResultToString(Object resultValue) {
            String str = ((Customer)(resultValue)).getName(); 
            return str;
        }
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if(constraint != null) {
                suggestions.clear();
                for (Customer customer : itemsAll) {
                    if(customer.getName().toLowerCase().startsWith(constraint.toString().toLowerCase())){
                        suggestions.add(customer);
                    }
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = suggestions;
                filterResults.count = suggestions.size();
                return filterResults;
            } else {
                return new FilterResults();
            }
        }
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            ArrayList<Customer> filteredList = (ArrayList<Customer>) results.values;
            if(results != null && results.count > 0) {
                clear();
                for (Customer c : filteredList) {
                    add(c);
                }
                notifyDataSetChanged();
            }
        }
    };

}
回复 原文
若有似无的小暗淡 2025-01-01 15:35:59

这是我的解决方案。我觉得它比公认的更干净（不使用 3 个独立的、令人困惑的 ArrayList），并且有更多选项。即使用户输入退格键，它也应该起作用，因为它不会从 mCustomers 中删除原始条目（与接受的答案不同）：

public class CustomerAdapter extends ArrayAdapter<Customer> {
    private LayoutInflater layoutInflater;
    List<Customer> mCustomers;

    private Filter mFilter = new Filter() {
        @Override
        public String convertResultToString(Object resultValue) {
            return ((Customer)resultValue).getName();
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();

            if (constraint != null) {
                ArrayList<Customer> suggestions = new ArrayList<Customer>();
                for (Customer customer : mCustomers) {
                    // Note: change the "contains" to "startsWith" if you only want starting matches
                    if (customer.getName().toLowerCase().contains(constraint.toString().toLowerCase())) {
                        suggestions.add(customer);
                    }
                }

                results.values = suggestions;
                results.count = suggestions.size();
            }

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            clear();
            if (results != null && results.count > 0) {
                // we have filtered results
                addAll((ArrayList<Customer>) results.values);
            } else {
                // no filter, add entire original list back in
                addAll(mCustomers);
            }
            notifyDataSetChanged();
        }
    };

    public CustomerAdapter(Context context, int textViewResourceId, List<Customer> customers) {
        super(context, textViewResourceId, customers);
        // copy all the customers into a master list
        mCustomers = new ArrayList<Customer>(customers.size());
        mCustomers.addAll(customers);
        layoutInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;

        if (view == null) {
            view = layoutInflater.inflate(R.layout.customerNameLabel, null);
        }

        Customer customer = getItem(position);

        TextView name = (TextView) view.findViewById(R.id.customerNameLabel);
        name.setText(customer.getName());

        return view;
    }

    @Override
    public Filter getFilter() {
        return mFilter;
    }
}

This is my solution. I feel like it's a bit cleaner (doesn't use 3 separate, confusing ArrayLists) than the accepted one, and has more options. It should work even if the user types backspace, because it doesn't remove the original entries from mCustomers (unlike the accepted answer):

public class CustomerAdapter extends ArrayAdapter<Customer> {
    private LayoutInflater layoutInflater;
    List<Customer> mCustomers;

    private Filter mFilter = new Filter() {
        @Override
        public String convertResultToString(Object resultValue) {
            return ((Customer)resultValue).getName();
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();

            if (constraint != null) {
                ArrayList<Customer> suggestions = new ArrayList<Customer>();
                for (Customer customer : mCustomers) {
                    // Note: change the "contains" to "startsWith" if you only want starting matches
                    if (customer.getName().toLowerCase().contains(constraint.toString().toLowerCase())) {
                        suggestions.add(customer);
                    }
                }

                results.values = suggestions;
                results.count = suggestions.size();
            }

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            clear();
            if (results != null && results.count > 0) {
                // we have filtered results
                addAll((ArrayList<Customer>) results.values);
            } else {
                // no filter, add entire original list back in
                addAll(mCustomers);
            }
            notifyDataSetChanged();
        }
    };

    public CustomerAdapter(Context context, int textViewResourceId, List<Customer> customers) {
        super(context, textViewResourceId, customers);
        // copy all the customers into a master list
        mCustomers = new ArrayList<Customer>(customers.size());
        mCustomers.addAll(customers);
        layoutInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;

        if (view == null) {
            view = layoutInflater.inflate(R.layout.customerNameLabel, null);
        }

        Customer customer = getItem(position);

        TextView name = (TextView) view.findViewById(R.id.customerNameLabel);
        name.setText(customer.getName());

        return view;
    }

    @Override
    public Filter getFilter() {
        return mFilter;
    }
}
回复 原文
一江春梦 2025-01-01 15:35:59

我们可以简单地重写 userDefined 对象（Customer）的 toString() 方法，而不是重写适配器中的 getFilter() 方法。
在 toString() 中，只需根据需要过滤的内容返回字段即可。这对我有用。

在我的示例中，我根据名称进行过滤：

public class Customer{
    private int id;
    private String name;

    @Override
    public String toString() {
        return this.name;
    }
}

Instead of overriding getFilter() method in adapter, simply we can override the toString() of the userDefined object (Customer).
In toString() just return the field based on what you need to filter. It worked for me.

In my example I'm filtering based on names:

public class Customer{
    private int id;
    private String name;

    @Override
    public String toString() {
        return this.name;
    }
}
回复 原文
优雅的叶子 2025-01-01 15:35:59

在上面的代码中，publisHResults()方法给出了并发修改异常......
我们必须将代码修改为：

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
    ArrayList<Customer> filteredList = (ArrayList<Customer>) results.values;
    ArrayList<Customer> customerList=new ArrayList<Customer>();
    if (results != null && results.count > 0) {
        clear();
        for (Customer c : filteredList) {
            customerList.add(c);
        }
        Iterator<Customer> customerIterator=getResult.iterator();
        while (customerIterator.hasNext()) {
            Customer customerIterator=customerIterator.next();
            add(customerIterator);
        }
        notifyDataSetChanged();
    }
}

In the above code publisHResults() method gives the concurrent modification exception....
we have to modify the code as:

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
    ArrayList<Customer> filteredList = (ArrayList<Customer>) results.values;
    ArrayList<Customer> customerList=new ArrayList<Customer>();
    if (results != null && results.count > 0) {
        clear();
        for (Customer c : filteredList) {
            customerList.add(c);
        }
        Iterator<Customer> customerIterator=getResult.iterator();
        while (customerIterator.hasNext()) {
            Customer customerIterator=customerIterator.next();
            add(customerIterator);
        }
        notifyDataSetChanged();
    }
}
回复 原文
樱花细雨 2025-01-01 15:35:59

也许这已经太晚了，你不需要重写所有这些函数，唯一要重写的函数是：

  public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(viewResourceId, null);
    }
    Customer customer = getItem(position);
    if (customer != null) {
        TextView customerNameLabel = (TextView) v.findViewById(R.id.customerNameLabel);
        if (customerNameLabel != null) {
            customerNameLabel.setText(String.valueOf(customer.getName()));
        }
    }
    return v;
}

考虑我改变：

 Customer customer = items.get(position);
 Customer customer = getItem(position);

注意，你不应该声明新的ListItems，

 private ArrayList<Customer> items;

因为ArrayAdapter使用它自己的mObjects，并且不过滤这个列表您的物品清单，
所以你应该使用 getItem 函数来访问项目。
那么就没有理由编写你的ArrayFilter。

Maybe this is too late, you dont need to override all of these functions , the only function to override is :

  public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(viewResourceId, null);
    }
    Customer customer = getItem(position);
    if (customer != null) {
        TextView customerNameLabel = (TextView) v.findViewById(R.id.customerNameLabel);
        if (customerNameLabel != null) {
            customerNameLabel.setText(String.valueOf(customer.getName()));
        }
    }
    return v;
}

consider I change :

 Customer customer = items.get(position);
 Customer customer = getItem(position);

pay attention, you should not declare new ListItems,

 private ArrayList<Customer> items;

because ArrayAdapter works with its own mObjects, and filter this list not your items list,
So you should use getItem function to access items.
then there is no reason to write your ArrayFilter.

回复 原文
守望孤独 2025-01-01 15:35:59

我不知道你在哪里检索 getResult。我认为这种情况下没有并发修改的解决方案是：

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
    ArrayList<Customer> filteredList = (ArrayList<Customer>) results.values;
    ArrayList<Customer> customerList=new ArrayList<Customer>();
    if (results != null && results.count > 0) {
        clear();

try{
            for (Customer c : filteredList) {
                customerList.add(c);
            }
}catch(Exception e){
Log.e("PEEEETAAAAAAAA", "AutoCompletaError: "+e.getMessage()+"  "+e.getCause()+" "+e.getLocalizedMessage());
            }

        Iterator<Customer> customerIterator=customerList.iterator();
        while (customerIterator.hasNext()) {
            Customer customerIterator=customerIterator.next();
            add(customerIterator);
        }
        notifyDataSetChanged();
    }
}

I don't know where you retrieving the getResult. I think the solution in this case for don't have the concurrent modification is:

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
    ArrayList<Customer> filteredList = (ArrayList<Customer>) results.values;
    ArrayList<Customer> customerList=new ArrayList<Customer>();
    if (results != null && results.count > 0) {
        clear();

try{
            for (Customer c : filteredList) {
                customerList.add(c);
            }
}catch(Exception e){
Log.e("PEEEETAAAAAAAA", "AutoCompletaError: "+e.getMessage()+"  "+e.getCause()+" "+e.getLocalizedMessage());
            }

        Iterator<Customer> customerIterator=customerList.iterator();
        while (customerIterator.hasNext()) {
            Customer customerIterator=customerIterator.next();
            add(customerIterator);
        }
        notifyDataSetChanged();
    }
}
回复 原文
夏九 2025-01-01 15:35:59

我希望这篇文章能够帮助人们将来实现类似的自定义功能。我基于我的微博应用程序中用于显示标签建议的适配器版本：

public class TagSuggestionsAdapter extends ArrayAdapter<String> implements Filterable

扩展 ArrayAdapter 以减少样板代码。实现 Filterable 以稍后更改过滤器行为。

    private List<String> allTags;
    private List<String> tagSuggestions;      
    private Context context;

public TagSuggestionsAdapter(List<String> initialTagSuggestions, List<String> allTags,
                             Context context) {
    super(context, R.layout.item_tag_suggestion, initialTagSuggestions);
    this.tagSuggestions = initialTagSuggestions;
    this.allTags = allTags;   
    this.context = context;
}

基本上在构造函数中，您需要传递一个最初显示的列表 - 它稍后将成为一个带有过滤结果的列表（这也是对调用notifyDataSetChanged()时将考虑的列表的引用），显然是一个列表您可以在此基础上进行过滤（在我的例子中为 allTags）。我还在 getView() 中传递布局膨胀的上下文。

   @NonNull
    @Override
    public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        ViewHolder viewHolder;    

        if (convertView == null) {
            convertView = LayoutInflater.from(context)
                    .inflate(R.layout.item_tag_suggestion, parent, false);
            viewHolder = new ViewHolder(convertView);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.tagSuggestionTextView.setText(tagSuggestions.get(position));

        return convertView;
    }

    static class ViewHolder {

        @BindView(R.id.tag_suggestion_text_view)
        TextView tagSuggestionTextView;

        ViewHolder(View itemView) {
            ButterKnife.bind(this, itemView);
        }
    }

在上面您可以看到一个简单的视图持有者模式，在 Butterknife 的帮助下可以扩展自定义行布局。

 @NonNull
    @Override
    public Filter getFilter() {
        return new Filter() {

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                if (constraint != null) {
                    List<String> filteredTags = filterTagSuggestions(constraint.toString(), allTags);
                    FilterResults filterResults = new FilterResults();
                    filterResults.values = filteredTags;
                    filterResults.count = filteredTags.size();
                    return filterResults;
                } else {
                    return new FilterResults();
                }
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                tagSuggestions.clear();
                if (results != null && results.count > 0) {
                    List<?> filteredTags = (List<?>) results.values;
                    for (Object filteredTag : filteredTags) {
                        if (filteredTag instanceof String) {
                            tagSuggestions.add((String) filteredTag);
                        }
                    }
                }
                notifyDataSetChanged();
            }
        };
    }

这是我能写的最少的样板代码。您唯一关心的是方法 filterTagSuggestions，它应该根据用户的输入返回过滤后的标签列表（CharSequence 约束）。希望能稍微总结和整理一些必要的信息。

I hope that this post will help people with implementation of a similar custom functionality in the future. I based this on my version of adapter used for displaying tag suggestions in my microblogging app:

public class TagSuggestionsAdapter extends ArrayAdapter<String> implements Filterable

Extending ArrayAdapter to have less boilerplate code. Implementing Filterable to change filter behavior later.

    private List<String> allTags;
    private List<String> tagSuggestions;      
    private Context context;

public TagSuggestionsAdapter(List<String> initialTagSuggestions, List<String> allTags,
                             Context context) {
    super(context, R.layout.item_tag_suggestion, initialTagSuggestions);
    this.tagSuggestions = initialTagSuggestions;
    this.allTags = allTags;   
    this.context = context;
}

Basically in constructor you need to pass a list that will be displayed initially - it'll later become a list with filtered results (this is also a reference to a list that will be taken into consideration when calling notifyDataSetChanged()) and obviously a list on which you can base your filtering (allTags in my case). I'm also passing Context for layout inflation in getView().

   @NonNull
    @Override
    public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        ViewHolder viewHolder;    

        if (convertView == null) {
            convertView = LayoutInflater.from(context)
                    .inflate(R.layout.item_tag_suggestion, parent, false);
            viewHolder = new ViewHolder(convertView);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.tagSuggestionTextView.setText(tagSuggestions.get(position));

        return convertView;
    }

    static class ViewHolder {

        @BindView(R.id.tag_suggestion_text_view)
        TextView tagSuggestionTextView;

        ViewHolder(View itemView) {
            ButterKnife.bind(this, itemView);
        }
    }

Above you can see a simple view holder pattern with a little help from Butterknife to inflate a custom row layout.

 @NonNull
    @Override
    public Filter getFilter() {
        return new Filter() {

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                if (constraint != null) {
                    List<String> filteredTags = filterTagSuggestions(constraint.toString(), allTags);
                    FilterResults filterResults = new FilterResults();
                    filterResults.values = filteredTags;
                    filterResults.count = filteredTags.size();
                    return filterResults;
                } else {
                    return new FilterResults();
                }
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                tagSuggestions.clear();
                if (results != null && results.count > 0) {
                    List<?> filteredTags = (List<?>) results.values;
                    for (Object filteredTag : filteredTags) {
                        if (filteredTag instanceof String) {
                            tagSuggestions.add((String) filteredTag);
                        }
                    }
                }
                notifyDataSetChanged();
            }
        };
    }

This is the least boilerplate code I could write. Your only concern is method filterTagSuggestions that should return a filtered list of tags based on input from user (CharSequence constraint). Hope that summarized and organized necessary info a little bit.

回复 原文
万劫不复 2025-01-01 15:35:59

如果您收到 ConcurrentModificationException 异常。

将 ArrayList 替换为线程安全的 CopyOnWriteArrayList。

在这里您可以找到详细信息答案

If you get ConcurrentModificationException exception.

Replace ArrayList with the thread safe CopyOnWriteArrayList.

Here you can find detatils answer

回复 原文
非要怀念 2025-01-01 15:35:59

我在上面的答案中遇到了非更新和修改原始列表问题。我用这段代码解决了这个问题。

public class AdapterAutoCompleteTextView extends ArrayAdapter<ItemWord> {

    private int LayoutID;
    private int TextViewID;

    private LayoutInflater Inflater;

    private List<ItemWord> ObjectsList;

    public AdapterAutoCompleteTextView(Context ActivityContext, int ResourceID, int TextViewResourceID, List<ItemWord> WordList) {
        super(ActivityContext, ResourceID, TextViewResourceID, new ArrayList<ItemWord>());

        LayoutID = ResourceID;
        TextViewID = TextViewResourceID;

        ObjectsList = WordList;

        Inflater = LayoutInflater.from(ActivityContext);
    }

    @Override
    public View getView(int Position, View ConvertView, ViewGroup Parent) {
        ItemWord Word = getItem(Position);

        if(ConvertView == null) {
            ConvertView = Inflater.inflate(LayoutID, null);

            ResultHolder Holder = new ResultHolder();

            Holder.ResultLabel= (TextView) ConvertView.findViewById(TextViewID);

            ConvertView.setTag(Holder);
        }

        ResultHolder Holder = (ResultHolder) ConvertView.getTag();

        Holder.ResultLabel.setText(Word.getSpelling());

        return ConvertView;
    }

    @Override
    public Filter getFilter() {
        return CustomFilter;
    }

    private Filter CustomFilter = new Filter() {
        @Override
        public CharSequence convertResultToString(Object ResultValue) {
            return ((ItemWord) ResultValue).getSpelling();
        }

        @Override
        protected FilterResults performFiltering(CharSequence Constraint) {
            FilterResults ResultsFilter = new FilterResults();

            ArrayList<ItemWord> OriginalValues = new ArrayList<ItemWord>(ObjectsList);

            if(Constraint == null || Constraint.length() == 0){
                ResultsFilter.values = OriginalValues;
                ResultsFilter.count = OriginalValues.size();
            } else {
                String PrefixString = Constraint.toString().toLowerCase();

                final ArrayList<ItemWord> NewValues = new ArrayList<ItemWord>();

                for(ItemWord Word : OriginalValues){
                    String ValueText = Word.getSpelling().toLowerCase();

                    if(ValueText.startsWith(PrefixString))
                        NewValues.add(Word);
                }

                ResultsFilter.values = NewValues;
                ResultsFilter.count = NewValues.size();
            }

            return ResultsFilter;
        }

        @Override
        protected void publishResults(CharSequence Constraint, FilterResults Results) {
            clear();

            if(Results.count > 0)
                addAll(((ArrayList<ItemWord>) Results.values));
            else
                notifyDataSetInvalidated();
        }
    };

    private static class ResultHolder {
        TextView ResultLabel;
    }

}

这是对于不更新和修改原始列表问题最重要的一行：

super(ActivityContext, ResourceID, TextViewResourceID, new ArrayList<ItemWord>());

特别是那些

super(ActivityContext, ResourceID, TextViewResourceID, new ArrayList() ）；

我希望这个解决方案能够帮助您:)

I have non-update and modify orginal list issues from above answer. I fixed this problem with this codes.

public class AdapterAutoCompleteTextView extends ArrayAdapter<ItemWord> {

    private int LayoutID;
    private int TextViewID;

    private LayoutInflater Inflater;

    private List<ItemWord> ObjectsList;

    public AdapterAutoCompleteTextView(Context ActivityContext, int ResourceID, int TextViewResourceID, List<ItemWord> WordList) {
        super(ActivityContext, ResourceID, TextViewResourceID, new ArrayList<ItemWord>());

        LayoutID = ResourceID;
        TextViewID = TextViewResourceID;

        ObjectsList = WordList;

        Inflater = LayoutInflater.from(ActivityContext);
    }

    @Override
    public View getView(int Position, View ConvertView, ViewGroup Parent) {
        ItemWord Word = getItem(Position);

        if(ConvertView == null) {
            ConvertView = Inflater.inflate(LayoutID, null);

            ResultHolder Holder = new ResultHolder();

            Holder.ResultLabel= (TextView) ConvertView.findViewById(TextViewID);

            ConvertView.setTag(Holder);
        }

        ResultHolder Holder = (ResultHolder) ConvertView.getTag();

        Holder.ResultLabel.setText(Word.getSpelling());

        return ConvertView;
    }

    @Override
    public Filter getFilter() {
        return CustomFilter;
    }

    private Filter CustomFilter = new Filter() {
        @Override
        public CharSequence convertResultToString(Object ResultValue) {
            return ((ItemWord) ResultValue).getSpelling();
        }

        @Override
        protected FilterResults performFiltering(CharSequence Constraint) {
            FilterResults ResultsFilter = new FilterResults();

            ArrayList<ItemWord> OriginalValues = new ArrayList<ItemWord>(ObjectsList);

            if(Constraint == null || Constraint.length() == 0){
                ResultsFilter.values = OriginalValues;
                ResultsFilter.count = OriginalValues.size();
            } else {
                String PrefixString = Constraint.toString().toLowerCase();

                final ArrayList<ItemWord> NewValues = new ArrayList<ItemWord>();

                for(ItemWord Word : OriginalValues){
                    String ValueText = Word.getSpelling().toLowerCase();

                    if(ValueText.startsWith(PrefixString))
                        NewValues.add(Word);
                }

                ResultsFilter.values = NewValues;
                ResultsFilter.count = NewValues.size();
            }

            return ResultsFilter;
        }

        @Override
        protected void publishResults(CharSequence Constraint, FilterResults Results) {
            clear();

            if(Results.count > 0)
                addAll(((ArrayList<ItemWord>) Results.values));
            else
                notifyDataSetInvalidated();
        }
    };

    private static class ResultHolder {
        TextView ResultLabel;
    }

}

This is most important line for non-update and modify orginal list issue:

super(ActivityContext, ResourceID, TextViewResourceID, new ArrayList<ItemWord>());

Particularly those

super(ActivityContext, ResourceID, TextViewResourceID, new ArrayList());

I hope this solution will be help you :)

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