content: /*
   * 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;
  
  
  /**
   * <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();
      }
  }
  