| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.widget; |
| |
| import android.content.Context; |
| import android.util.AttributeSet; |
| import android.view.accessibility.AccessibilityNodeInfo; |
| |
| |
| /** |
| * <p> |
| * A radio button is a two-states button that can be either checked or |
| * unchecked. When the radio button is unchecked, the user can press or click it |
| * to check it. However, contrary to a {@link android.widget.CheckBox}, a radio |
| * button cannot be unchecked by the user once checked. |
| * </p> |
| * |
| * <p> |
| * Radio buttons are normally used together in a |
| * {@link android.widget.RadioGroup}. When several radio buttons live inside |
| * a radio group, checking one radio button unchecks all the others.</p> |
| * </p> |
| * |
| * <p>See the <a href="{@docRoot}guide/topics/ui/controls/radiobutton.html">Radio Buttons</a> |
| * guide.</p> |
| * |
| * <p><strong>XML attributes</strong></p> |
| * <p> |
| * See {@link android.R.styleable#CompoundButton CompoundButton Attributes}, |
| * {@link android.R.styleable#Button Button Attributes}, |
| * {@link android.R.styleable#TextView TextView Attributes}, |
| * {@link android.R.styleable#View View Attributes} |
| * </p> |
| */ |
| public class RadioButton extends CompoundButton { |
| |
| public RadioButton(Context context) { |
| this(context, null); |
| } |
| |
| public RadioButton(Context context, AttributeSet attrs) { |
| this(context, attrs, com.android.internal.R.attr.radioButtonStyle); |
| } |
| |
| public RadioButton(Context context, AttributeSet attrs, int defStyleAttr) { |
| this(context, attrs, defStyleAttr, 0); |
| } |
| |
| public RadioButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * <p> |
| * If the radio button is already checked, this method will not toggle the radio button. |
| */ |
| @Override |
| public void toggle() { |
| // we override to prevent toggle when the radio is already |
| // checked (as opposed to check boxes widgets) |
| if (!isChecked()) { |
| super.toggle(); |
| } |
| } |
| |
| @Override |
| public CharSequence getAccessibilityClassName() { |
| return RadioButton.class.getName(); |
| } |
| |
| @Override |
| public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { |
| super.onInitializeAccessibilityNodeInfo(info); |
| if (getParent() instanceof RadioGroup) { |
| RadioGroup radioGroup = (RadioGroup) getParent(); |
| if (radioGroup.getOrientation() == LinearLayout.HORIZONTAL) { |
| info.setCollectionItemInfo(AccessibilityNodeInfo.CollectionItemInfo.obtain(0, 1, |
| radioGroup.getIndexWithinVisibleButtons(this), 1, false, isChecked())); |
| } else { |
| info.setCollectionItemInfo(AccessibilityNodeInfo.CollectionItemInfo.obtain( |
| radioGroup.getIndexWithinVisibleButtons(this), 1, 0, 1, |
| false, isChecked())); |
| } |
| } |
| } |
| } |