mirror of
https://github.com/material-components/material-components-android.git
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1217dcfb55
In TalkBack, once the menu is double tapped the focus automatically changes to the first item on the dropdown list, just like how it would with a Spinner. Clients may keep using the framework's AutoCompleteTextView inside of the TextInputLayout as before. PiperOrigin-RevId: 272026973
127 lines
4.8 KiB
Java
127 lines
4.8 KiB
Java
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.material.textview;
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import com.google.android.material.R;
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import android.content.Context;
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import android.os.Build.VERSION;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import android.support.v7.widget.AppCompatAutoCompleteTextView;
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import androidx.appcompat.widget.ListPopupWindow;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.accessibility.AccessibilityManager;
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import android.view.inputmethod.EditorInfo;
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import android.widget.AdapterView;
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import android.widget.AdapterView.OnItemClickListener;
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import android.widget.Filterable;
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import android.widget.ListAdapter;
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/**
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* A special sub-class of {@link android.widget.AutoCompleteTextView} that is auto-inflated so that
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* non-editable auto-complete text fields (e.g., for an Exposed Dropdown Menu) are accessible when
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* being interacted through a screen reader.
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*
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* <p>The {@link ListPopupWindow} of the {@link android.widget.AutoCompleteTextView} is not modal,
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* so it does not grab accessibility focus. The {@link MaterialAutoCompleteTextView} changes that
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* by having a modal {@link ListPopupWindow} that is displayed instead of the non-modal one when the
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* {@link MaterialAutoCompleteTextView} is not editable, so that the first item of the popup is
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* automatically focused. This simulates the behavior of the {@link android.widget.Spinner}.
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*/
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public class MaterialAutoCompleteTextView extends AppCompatAutoCompleteTextView {
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@NonNull private final ListPopupWindow modalListPopup;
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@Nullable private final AccessibilityManager accessibilityManager;
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public MaterialAutoCompleteTextView(@NonNull Context context) {
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this(context, null);
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}
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public MaterialAutoCompleteTextView(
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@NonNull Context context, @Nullable AttributeSet attributeSet) {
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this(context, attributeSet, R.attr.autoCompleteTextViewStyle);
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}
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public MaterialAutoCompleteTextView(
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@NonNull Context context, @Nullable AttributeSet attributeSet, int defStyleAttr) {
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super(context, attributeSet, defStyleAttr);
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accessibilityManager =
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(AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
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modalListPopup = new ListPopupWindow(getContext());
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modalListPopup.setModal(true);
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modalListPopup.setAnchorView(this);
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modalListPopup.setInputMethodMode(ListPopupWindow.INPUT_METHOD_NOT_NEEDED);
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modalListPopup.setAdapter(getAdapter());
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modalListPopup.setOnItemClickListener(
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new OnItemClickListener() {
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@Override
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public void onItemClick(AdapterView<?> parent, View selectedView, int position, long id) {
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Object selectedItem =
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position < 0 ? modalListPopup.getSelectedItem() : getAdapter().getItem(position);
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updateText(selectedItem);
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OnItemClickListener userOnitemClickListener = getOnItemClickListener();
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if (userOnitemClickListener != null) {
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if (selectedView == null || position < 0) {
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selectedView = modalListPopup.getSelectedView();
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position = modalListPopup.getSelectedItemPosition();
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id = modalListPopup.getSelectedItemId();
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}
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userOnitemClickListener.onItemClick(
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modalListPopup.getListView(), selectedView, position, id);
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}
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modalListPopup.dismiss();
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}
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});
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}
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@Override
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public void showDropDown() {
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if (getInputType() == EditorInfo.TYPE_NULL
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&& accessibilityManager != null
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&& accessibilityManager.isTouchExplorationEnabled()) {
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modalListPopup.show();
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} else {
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super.showDropDown();
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}
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}
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@Override
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public <T extends ListAdapter & Filterable> void setAdapter(@Nullable T adapter) {
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super.setAdapter(adapter);
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modalListPopup.setAdapter(getAdapter());
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}
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@SuppressWarnings("unchecked")
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private <T extends ListAdapter & Filterable> void updateText(Object selectedItem) {
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if (VERSION.SDK_INT >= 17) {
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setText(convertSelectionToString(selectedItem), false);
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} else {
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ListAdapter adapter = getAdapter();
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setAdapter(null);
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setText(convertSelectionToString(selectedItem));
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setAdapter((T) adapter);
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}
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}
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}
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