自定义 ArrayAdapter AutoCompleteTextView 未触发

【问题标题】：Custom ArrayAdapter AutoCompleteTextView not triggering自定义 ArrayAdapter AutoCompleteTextView 未触发
【发布时间】：2017-12-18 05:03:49
【问题描述】：

自定义 ArrayAdapter AutoCompleteTextView 未触发 我正在尝试使用自定义列表适配器将 AutoCompleteTextView 与对象的 ArrayList 一起使用，但我无法显示自动完成列表。这是我的代码： activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="rick.customarrayadpter.MainActivity">

        <AutoCompleteTextView
            android:id="@+id/customerACTV"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="search" />
    </android.support.constraint.ConstraintLayout>

MainActivity.java
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.AutoCompleteTextView;

    import java.util.ArrayList;

    public class MainActivity extends AppCompatActivity {
        private ArrayList<Customer> customerList;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            customerList = new ArrayList<Customer>();
            customerList.add(new Customer(111, "Pete"));
            customerList.add(new Customer(222, "Bob"));
            customerList.add(new Customer(333, "Paul"));
            customerList.add(new Customer(444, "Tom"));
            customerList.add(new Customer(555, "Jane"));
            customerList.add(new Customer(666, "Susan"));

            CustomerListAdapter customerListAdapter = new CustomerListAdapter(this, R.layout.support_simple_spinner_dropdown_item, R.id.customerACTV, customerList);
            AutoCompleteTextView customerACTV = (AutoCompleteTextView)findViewById(R.id.customerACTV);
            customerACTV.setThreshold(1);
            customerACTV.setAdapter(customerListAdapter);

        }

    }

CustomerListAdapter.java
    public class CustomerListAdapter extends ArrayAdapter<Customer> {

            ArrayList<Customer> customerList = new ArrayList<>();

            public CustomerListAdapter(Context context, int resource,int textViewResourceId,  ArrayList<Customer> objects) {
                super(context, resource, textViewResourceId, objects);
                customerList = objects;
            }

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

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

                View v = convertView;
                LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = inflater.inflate(R.layout.list_items, null);
                AutoCompleteTextView textView = (AutoCompleteTextView) v.findViewById(R.id.customerACTV);
                textView.setText(customerList.get(position).getName());
                return v;

            }
        }

list_items.xml
    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"

            android:text="Demo"
            android:textColor="#000" />


    </android.support.constraint.ConstraintLayout>

    Customer.java
    public class Customer {
        String name;
        int id;
        public Customer(int ID, String Name){
            this.id = ID;
            this.name = Name;
        }

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

代码中没有错误，但是当我在 customerACTV 中输入字母时，它没有显示自动完成选择。正在调用 CustomerListAdapter 构造函数，并且正在传递 Customer 对象的 ArrayList，但未调用 CustomerListAdapter 的 getView。

谢谢

【问题讨论】：

  • 我看过其他一些有同样问题但没有答案的帖子。

标签： android-arrayadapter autocompletetextview


【解决方案1】：

为了使自动建议起作用，在自动完成文本视图中，我们必须覆盖 getFilter()，我们在其中设置过滤器功能，默认适配器只能过滤字符串，并且您正在使用对象 Customer

所以你需要在你里面做以下事情：

@NonNull
@Override
public Filter getFilter() {

    return new Filter() {
        final Object object = new Object();

        @Override
        public String convertResultToString(Object resultValue) {
         return resultValue.toString();

        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {




            FilterResults filterResults = new FilterResults();
            List<Customer> customers = new ArrayList<>();

            if (constraint != null) {

                for (Customer customer : customerList) {
                    if (department instanceof SearchableStrings) {
                        if (customer.getname().toLowerCase().contains(constraint.toString().toLowerCase())) {
                            customers.add(customer);

                        }

                    } 
                    if (customers.size() > 1) {
                        filterResults.values = customers;
                        filterResults.count =      customers.size();
                    } else {
                        filterResults.values = null;
                        filterResults.count = 0;


                }



            }
            //notifyDataSetChanged();
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {

            // mObjects.clear();
            if (results != null && results.count > 0) {
               clear();
                // avoids unchecked cast warning when using customerList.addAll((ArrayList<Customer>) results.values);
                for (Object object : (List<?>) results.values) {
                    add(object);


                }
                notifyDataSetChanged();
            }
        }


    };

【讨论】：

  • 谢谢 Kaustubh，这就是问题所在，它现在可以工作了，但我还有一点问题。当我从自动完成的下拉列表中选择某些内容然后使用退格键或更改文本时，自动完成下拉列表不会显示。如果用户想要更改那里的选择，它应该再次显示。有什么建议？再次感谢。
  • 我只能看到适配器，而且看起来不错，自动完成下拉框只有在publishresults方法中没有任何内容时才显示，请调试并检查它
【解决方案2】： 
public class CustomerListAdapter extends ArrayAdapter<Customer> {

ArrayList<Customer> customerList, suggestionList;


public CustomerListAdapter(Context context, int resource, int textViewResourceId, ArrayList<Customer> customerList) {
    super(context, resource, textViewResourceId, customerList);
    this.customerList = new ArrayList<>();
    this.customerList = customerList;

}

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

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

    View view = convertView;
    if(convertView == null){
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.list_items, parent, false);
    }

    Customer customer = customerList.get(position);
    if(customer != null){
        TextView textView = view.findViewById(R.id.textView);
        if(textView != null)
            textView.setText(customer.getName());
    }
    return view;
}



@NonNull
@Override
public Filter getFilter() {
    return new Filter() {
        final Object object = new Object();

        @Override
        public String convertResultToString(Object resultValue) {
            Customer customer = (Customer) resultValue;
            return customer.getName();
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {


            FilterResults filterResults = new FilterResults();
            suggestionList = new ArrayList<>();
            if (constraint != null) {
                for (Customer customer : customerList) {

                    if (customer.getName().toLowerCase().contains(constraint.toString().toLowerCase())) {
                        suggestionList.add(customer);
                    }
                    if (customerList.size() > 1) {
                        filterResults.values = suggestionList;
                        filterResults.count = suggestionList.size();
                    } else {
                        filterResults.values = null;
                        filterResults.count = 0;
                    }
                }
            }
            return filterResults;
        }

        @Override
        protected void publishResults (CharSequence constraint, FilterResults results){
            ArrayList<Customer> filterList = (ArrayList<Customer>)results.values;

            if (results != null && results.count > 0) {
                clear();
                for (Customer customer : filterList) {
                    add(customer);
                    notifyDataSetChanged();
                }
                notifyDataSetChanged();
            }
        }
    };
}

}

【讨论】：

  • 我在调试时发现了几个问题。必须更改 getFilter performFiltering 函数和 CustomerListAdapter 构造函数。
【解决方案3】：

公共类 CustomerListAdapter 扩展 ArrayAdapter {

private ArrayList<Customer> customerList;
private ArrayList<Customer> filteredList;

public CustomerListAdapter(Context context, int resource, int textViewResourceId, ArrayList<Customer> customerList) {
    super(context, resource, textViewResourceId, customerList);
    this.customerList = new ArrayList<Customer>(customerList);
    this.filteredList = customerList;
}

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

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

    View view = convertView;
    if(convertView == null){
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.list_items, parent, false);
    }

    Customer customer = filteredList.get(position);
    if(customer != null){
        TextView textView = view.findViewById(R.id.textView);
        if(textView != null)
            textView.setText(customer.getName());
    }
    return view;
}

@NonNull
@Override
public Filter getFilter() {
    return new Filter() {
        final Object object = new Object();

        @Override
        public String convertResultToString(Object resultValue) {
            Customer customer = (Customer) resultValue;
            return customer.getName();
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults filterResults = new FilterResults();
            ArrayList<Customer> filters = new ArrayList<Customer>();
            if (constraint != null && constraint.length()>0) {
                for (Customer customer : customerList) {

                    if (customer.getName().toLowerCase().contains(constraint.toString().toLowerCase())) {
                        filters.add(customer);
                    }
                 }
                filterResults.values = filters;
                filterResults.count = filters.size();
                filteredList = filters;
            }
            return filterResults;
        }

        @Override
        protected void publishResults (CharSequence constraint, FilterResults results){
            ArrayList<Customer> filterList = (ArrayList<Customer>)results.values;

            if (results != null && results.count > 0) {
                clear();
                for (Customer customer : filterList) {
                    add(customer);
                    notifyDataSetChanged();
                }
                notifyDataSetChanged();
            }
        }
    };
}

}

【讨论】：

  • 在构造函数中，我有 customerList = objects;它将变量 customerList 设置为与对象相同的引用。因此，如果我修改了任何对象项，它也会更改 customerList 项，并且基类必须更改它们。所以我把它改成了 this.customerList = new ArrayList(customerList);当BackSpace密钥更改选择时，这将在ChickingFilter中保留原始ArrayList的副本。感谢您帮助考斯图布。我真的被那个卡住了。
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