118 lines
3.9 KiB
Java
118 lines
3.9 KiB
Java
/*
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* Copyright (C) 2006 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 android.widget;
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import android.annotation.NonNull;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.accessibility.AccessibilityNodeInfo;
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import android.widget.RemoteViews.RemoteView;
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import com.android.internal.R;
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/**
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* <p>
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* A radio button is a two-states button that can be either checked or
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* unchecked. When the radio button is unchecked, the user can press or click it
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* to check it. However, contrary to a {@link android.widget.CheckBox}, a radio
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* button cannot be unchecked by the user once checked.
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* </p>
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*
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* <p>
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* Radio buttons are normally used together in a
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* {@link android.widget.RadioGroup}. When several radio buttons live inside
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* a radio group, checking one radio button unchecks all the others.</p>
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* </p>
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*
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* <p>See the <a href="{@docRoot}guide/topics/ui/controls/radiobutton.html">Radio Buttons</a>
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* guide.</p>
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*
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* <p><strong>XML attributes</strong></p>
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* <p>
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* See {@link android.R.styleable#CompoundButton CompoundButton Attributes},
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* {@link android.R.styleable#Button Button Attributes},
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* {@link android.R.styleable#TextView TextView Attributes},
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* {@link android.R.styleable#View View Attributes}
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* </p>
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*/
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@RemoteView
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public class RadioButton extends CompoundButton {
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public RadioButton(Context context) {
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this(context, null);
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}
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public RadioButton(Context context, AttributeSet attrs) {
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this(context, attrs, com.android.internal.R.attr.radioButtonStyle);
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}
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public RadioButton(Context context, AttributeSet attrs, int defStyleAttr) {
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this(context, attrs, defStyleAttr, 0);
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}
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public RadioButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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super(context, attrs, defStyleAttr, defStyleRes);
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}
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/**
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* {@inheritDoc}
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* <p>
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* If the radio button is already checked, this method will not toggle the radio button.
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*/
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@Override
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public void toggle() {
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// we override to prevent toggle when the radio is already
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// checked (as opposed to check boxes widgets)
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if (!isChecked()) {
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super.toggle();
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}
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}
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@Override
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public CharSequence getAccessibilityClassName() {
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return RadioButton.class.getName();
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}
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@Override
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public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
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super.onInitializeAccessibilityNodeInfo(info);
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if (getParent() instanceof RadioGroup) {
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RadioGroup radioGroup = (RadioGroup) getParent();
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if (radioGroup.getOrientation() == LinearLayout.HORIZONTAL) {
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info.setCollectionItemInfo(AccessibilityNodeInfo.CollectionItemInfo.obtain(0, 1,
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radioGroup.getIndexWithinVisibleButtons(this), 1, false, isChecked()));
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} else {
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info.setCollectionItemInfo(AccessibilityNodeInfo.CollectionItemInfo.obtain(
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radioGroup.getIndexWithinVisibleButtons(this), 1, 0, 1,
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false, isChecked()));
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}
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}
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}
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/** @hide **/
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@Override
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@NonNull
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protected CharSequence getButtonStateDescription() {
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if (isChecked()) {
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return getResources().getString(R.string.selected);
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} else {
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return getResources().getString(R.string.not_selected);
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}
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}
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}
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