android - 下拉列表未更新 onTextChange 监听器

Question

public class MainActivity extends ActionBarActivity {



AutoCompleteTextView autoCompleteTextView;
String[] list;
int textlength = 0;
EditText edt;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    list = getResources().getStringArray(R.array.month);



    final ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
            android.R.layout.simple_dropdown_item_1line, list);
    autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.tv);

    autoCompleteTextView.setAdapter(adapter);

    autoCompleteTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            autoCompleteTextView.showDropDown();
        }
    });

    autoCompleteTextView.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            textlength = autoCompleteTextView.getText().length();

            String searchString = autoCompleteTextView.getText().toString();
            for (int i = 0; i < list.length; i++) {

                String str = list[i].toLowerCase();

                if (str.contains(searchString)) {
                    System.out.println("List matched items " + list[i]);
                }
                adapter.notifyDataSetChanged();
            }

        }

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

        @Override
        public void afterTextChanged(Editable s) {

        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_visit_repo) {
        Uri uri = Uri.parse("https://github.com/Lesilva/BetterSpinner");
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);


        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

我想在自动完成文本框中的文本更改时更新我的​​下拉列表。 我已经编写了当用户键入任何文本时更新列表的逻辑，如果任何单词与字符串匹配，那么它应该更新我的列表。 我在控制台中获得了正确的列表，但无法刷新列表。

我认为我的 notifyDataSetChanged() 没有正常工作。

我也尝试过 adapter.getFilter().filter(s); 而不是 adapter.notifyDataSetChanged() 但仍然遇到问题

Answer 1

由于这是 autoCompleteTextView，您应该制作新的适配器并覆盖 getFilter() 方法。根据您的要求尝试此代码。

public class MainActivity extends AppCompatActivity {

AutoCompleteTextView autoCompleteTextView;
String[] list;

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

    list = getResources().getStringArray(R.array.month);

    final List<String> arrList = new ArrayList<>();
    Collections.addAll(arrList, list);




    final CustomAdapter adapter = new CustomAdapter(this,android.R.layout.simple_dropdown_item_1line,arrList,list);
    autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.tv);

    autoCompleteTextView.setAdapter(adapter);

    autoCompleteTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            autoCompleteTextView.showDropDown();
        }
    });


}




@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}


}

这应该是您的适配器:

public class CustomAdapter extends ArrayAdapter<String> {
private String[] list;




public CustomAdapter(Context context, int resource, List<String> objects, String[] list) {
    super(context, resource, objects);
    this.list = list;
}



@Override
public android.widget.Filter getFilter() {
    return filter;
}
android.widget.Filter filter = new android.widget.Filter() {
    @Override
    protected FilterResults performFiltering(CharSequence charSequence) {
        if(charSequence != null) {


            String searchString = charSequence.toString();
            List<String> newArrList = new ArrayList<>();
            FilterResults filterResults = new FilterResults();

            for (String aList : list) {

                String str = aList.toLowerCase();


                if (str.contains(searchString)) {
                    System.out.println("List matched items " + aList);
                    newArrList.add(aList);
                }


            }
            filterResults.values = newArrList;
            filterResults.count = newArrList.size();
            return filterResults;

        }else {

            return new FilterResults();
        }
    }

    @Override
    protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
        if(filterResults != null ) {
            ArrayList<String> filteredList = (ArrayList<String>) filterResults.values;
            if (filterResults.count > 0) {
                clear();

                for (int i = 0; i < filteredList.size(); i++) {
                    add(filteredList.get(i));
                }
                notifyDataSetChanged();
            }
        }

    }
};
}