Android RadioGroup 自定义布局, 支持多行多列

摘抄至：http://blog.csdn.net/zhoulv2000/article/details/17578727

经过反复试验，发现无论你怎么摆弄RadioGroup, 都无法实现多行多列的单选按钮组。
1. 如果不结合其他布局，例如LinearLayout, 则只能实现单行多个按钮组，或者单列多个按钮组。
2. 如果结合其他布局， 虽然可以实现多行多列的RadioButton布局，但是，如果不通过一些互斥算法，也无法实现按钮组的单选操作。


    所以，我对RadioGroup进行了改写.

 /*
 * 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.
 *
 * 2013.11.06 updated by xiexiaojian
 * Support that LinearLayouts or RadioButtons can be all RadioGroup's childrens,
 * we can display more rows and columns at the same time.
 */

 package tv.pps.mobile.newipd.version3.custom.view;

 import android.content.Context;
 import android.content.res.TypedArray;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.CompoundButton;
 import android.widget.LinearLayout;
 import android.widget.RadioButton;


 /**
 * <p>This class is used to create a multiple-exclusion scope for a set of radio
 * buttons. Checking one radio button that belongs to a radio group unchecks
 * any previously checked radio button within the same group.</p>
 *
 * <p>Intially, all of the radio buttons are unchecked. While it is not possible
 * to uncheck a particular radio button, the radio group can be cleared to
 * remove the checked state.</p>
 *
 * <p>The selection is identified by the unique id of the radio button as defined
 * in the XML layout file.</p>
 *
 * <p><strong>XML Attributes</strong></p>
 * <p>See {@link android.R.styleable#RadioGroup RadioGroup Attributes},
 * {@link android.R.styleable#LinearLayout LinearLayout Attributes},
 * {@link android.R.styleable#ViewGroup ViewGroup Attributes},
 * {@link android.R.styleable#View View Attributes}</p>
 * <p>Also see
 * {@link android.widget.LinearLayout.LayoutParams LinearLayout.LayoutParams}
 * for layout attributes.</p>
 *
 * @see RadioButton
 *
 */
 public class RadioGroup extends LinearLayout {
      // holds the checked id; the selection is empty by default
     private int mCheckedId = -1;
      // tracks children radio buttons checked state
     private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
      // when true, mOnCheckedChangeListener discards events
     private boolean mProtectFromCheckedChange = false;
     private OnCheckedChangeListener mOnCheckedChangeListener;
     private PassThroughHierarchyChangeListener mPassThroughListener;

      /**
      * {@inheritDoc}
      */
     public RadioGroup(Context context) {
          super(context);
         setOrientation(VERTICAL);
         init();
     }

      /**
      * {@inheritDoc}
      */
     public RadioGroup(Context context, AttributeSet attrs) {
          super(context, attrs);
         mCheckedId = View.NO_ID;

          final  int index = VERTICAL;
         setOrientation(index);

         init();
     }

     private void init() {
         mChildOnCheckedChangeListener =  new CheckedStateTracker();
         mPassThroughListener =  new PassThroughHierarchyChangeListener();
          super.setOnHierarchyChangeListener(mPassThroughListener);
     }

      /**
      * {@inheritDoc}
      */
     @Override
     public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
          // the user listener is delegated to our pass-through listener
         mPassThroughListener.mOnHierarchyChangeListener = listener;
     }

      /**
      * {@inheritDoc}
      */
     @Override
     protected void onFinishInflate() {
          super.onFinishInflate();

          // checks the appropriate radio button as requested in the XML file
          if (mCheckedId != -1) {
             mProtectFromCheckedChange =  true;
             setCheckedStateForView(mCheckedId,  true);
             mProtectFromCheckedChange =  false;
             setCheckedId(mCheckedId);
         }
     }

     @Override
     public void addView(final View child, int index, ViewGroup.LayoutParams params) {
          if (child  instanceof RadioButton) {

             ((RadioButton) child).setOnTouchListener(new OnTouchListener() {

                  @Override
                  public  boolean onTouch(View v, MotionEvent event) {
                     ((RadioButton) child).setChecked(true);
                     checkRadioButton((RadioButton) child);
                      if(mOnCheckedChangeListener != null){
                         mOnCheckedChangeListener.onCheckedChanged(RadioGroup.this, child.getId());
                     }
                      return  true;
                 }
             });

         }  else if(child instanceof LinearLayout){
              int childCount = ((LinearLayout) child).getChildCount();
              for(int i = 0; i < childCount; i++){
                 View view = ((LinearLayout) child).getChildAt(i);
                  if (view  instanceof RadioButton) {
                      final RadioButton button = (RadioButton) view;


                     ((RadioButton) button).setOnTouchListener(new OnTouchListener() {

                          @Override
                          public  boolean onTouch(View v, MotionEvent event) {
                             ((RadioButton) button).setChecked(true);
                             checkRadioButton((RadioButton) button);
                              if(mOnCheckedChangeListener != null){
                                 mOnCheckedChangeListener.onCheckedChanged(RadioGroup.this, button.getId());
                             }
                              return  true;
                         }
                     });

                 }
             }
         }

          super.addView(child, index, params);
     }

     private void checkRadioButton(RadioButton radioButton){
         View child;
          int radioCount = getChildCount();
          for(int i = 0; i < radioCount; i++){
             child = getChildAt(i);
              if (child  instanceof RadioButton) {
                  if(child == radioButton){
                      // do nothing
                 }  else {
                     ((RadioButton) child).setChecked(false);
                 }
             }  else if(child instanceof LinearLayout){
                  int childCount = ((LinearLayout) child).getChildCount();
                  for(int j = 0; j < childCount; j++){
                     View view = ((LinearLayout) child).getChildAt(j);
                      if (view  instanceof RadioButton) {
                          final RadioButton button = (RadioButton) view;
                          if(button == radioButton){
                              // do nothing
                         }  else {
                             ((RadioButton) button).setChecked(false);
                         }
                     }
                 }
             }
         }
     }

      /**
      * <p>Sets the selection to the radio button whose identifier is passed in
      * parameter. Using -1 as the selection identifier clears the selection;
      * such an operation is equivalent to invoking {@link #clearCheck()}.</p>
      *
      * @param id the unique id of the radio button to select in this group
      *
      * @see #getCheckedRadioButtonId()
      * @see #clearCheck()
      */
     public void check(int id) {
          // don't even bother
          if (id != -1 && (id == mCheckedId)) {
              return;
         }

          if (mCheckedId != -1) {
             setCheckedStateForView(mCheckedId,  false);
         }

          if (id != -1) {
             setCheckedStateForView(id,  true);
         }

         setCheckedId(id);
     }

     private void setCheckedId(int id) {
         mCheckedId = id;
     }

     private void setCheckedStateForView(int viewId, boolean checked) {
         View checkedView = findViewById(viewId);
          if (checkedView != null && checkedView instanceof RadioButton) {
             ((RadioButton) checkedView).setChecked(checked);
         }
     }

      /**
      * <p>Returns the identifier of the selected radio button in this group.
      * Upon empty selection, the returned value is -1.</p>
      *
      * @return the unique id of the selected radio button in this group
      *
      * @see #check(int)
      * @see #clearCheck()
      *
      * @attr ref android.R.styleable#RadioGroup_checkedButton
      */
     public int getCheckedRadioButtonId() {
          return mCheckedId;
     }

      /**
      * <p>Clears the selection. When the selection is cleared, no radio button
      * in this group is selected and {@link #getCheckedRadioButtonId()} returns
      * null.</p>
      *
      * @see #check(int)
      * @see #getCheckedRadioButtonId()
      */
     public void clearCheck() {
         check(-1);
     }

      /**
      * <p>Register a callback to be invoked when the checked radio button
      * changes in this group.</p>
      *
      * @param listener the callback to call on checked state change
      */
     public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
         mOnCheckedChangeListener = listener;
     }

      /**
      * {@inheritDoc}
      */
     @Override
     public LayoutParams generateLayoutParams(AttributeSet attrs) {
          return  new RadioGroup.LayoutParams(getContext(), attrs);
     }

      /**
      * {@inheritDoc}
      */
     @Override
     protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
          return p  instanceof RadioGroup.LayoutParams;
     }

     @Override
     protected LinearLayout.LayoutParams generateDefaultLayoutParams() {
          return  new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
     }

     @Override
     public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
          super.onInitializeAccessibilityEvent(event);
         event.setClassName(RadioGroup.class.getName());
     }

     @Override
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
          super.onInitializeAccessibilityNodeInfo(info);
         info.setClassName(RadioGroup.class.getName());
     }

      /**
      * <p>This set of layout parameters defaults the width and the height of
      * the children to {@link #WRAP_CONTENT} when they are not specified in the
      * XML file. Otherwise, this class ussed the value read from the XML file.</p>
      *
      * <p>See
      * {@link android.R.styleable#LinearLayout_Layout LinearLayout Attributes}
      * for a list of all child view attributes that this class supports.</p>
      *
      */
     public static class LayoutParams extends LinearLayout.LayoutParams {
          /**
          * {@inheritDoc}
          */
          public LayoutParams(Context c, AttributeSet attrs) {
              super(c, attrs);
         }

          /**
          * {@inheritDoc}
          */
          public LayoutParams(int w, int h) {
              super(w, h);
         }

          /**
          * {@inheritDoc}
          */
          public LayoutParams(int w, int h, float initWeight) {
              super(w, h, initWeight);
         }

          /**
          * {@inheritDoc}
          */
          public LayoutParams(ViewGroup.LayoutParams p) {
              super(p);
         }

          /**
          * {@inheritDoc}
          */
          public LayoutParams(MarginLayoutParams source) {
              super(source);
         }

          /**
          * <p>Fixes the child's width to
          * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and the child's
          * height to  {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}
          * when not specified in the XML file.</p>
          *
          * @param a the styled attributes set
          * @param widthAttr the width attribute to fetch
          * @param heightAttr the height attribute to fetch
          */
          @Override
          protected  void setBaseAttributes(TypedArray a,
                  int widthAttr, int heightAttr) {

              if (a.hasValue(widthAttr)) {
                 width = a.getLayoutDimension(widthAttr, "layout_width");
             }  else {
                 width = WRAP_CONTENT;
             }

              if (a.hasValue(heightAttr)) {
                 height = a.getLayoutDimension(heightAttr, "layout_height");
             }  else {
                 height = WRAP_CONTENT;
             }
         }
     }

      /**
      * <p>Interface definition for a callback to be invoked when the checked
      * radio button changed in this group.</p>
      */
     public interface OnCheckedChangeListener {
          /**
          * <p>Called when the checked radio button has changed. When the
          * selection is cleared, checkedId is -1.</p>
          *
          * @param group the group in which the checked radio button has changed
          * @param checkedId the unique identifier of the newly checked radio button
          */
          public  void onCheckedChanged(RadioGroup group, int checkedId);
     }

     private class CheckedStateTracker implements CompoundButton.OnCheckedChangeListener {
          public  void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              // prevents from infinite recursion
              if (mProtectFromCheckedChange) {
                  return;
             }

             mProtectFromCheckedChange =  true;
              if (mCheckedId != -1) {
                 setCheckedStateForView(mCheckedId,  false);
             }
             mProtectFromCheckedChange =  false;

              int id = buttonView.getId();
             setCheckedId(id);
         }
     }

      /**
      * <p>A pass-through listener acts upon the events and dispatches them
      * to another listener. This allows the table layout to set its own internal
      * hierarchy change listener without preventing the user to setup his.</p>
      */
     private class PassThroughHierarchyChangeListener implements
             ViewGroup.OnHierarchyChangeListener {
          private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;

          /**
          * {@inheritDoc}
          */
          public  void onChildViewAdded(View parent, View child) {
              if (parent == RadioGroup.this && child instanceof RadioButton) {
                  int id = child.getId();
                  // generates an id if it's missing
                  if (id == View.NO_ID) {
                     id = child.hashCode();
                     child.setId(id);
                 }
                 ((RadioButton) child).setOnCheckedChangeListener(
                         mChildOnCheckedChangeListener);
             }

              if (mOnHierarchyChangeListener != null) {
                 mOnHierarchyChangeListener.onChildViewAdded(parent, child);
             }
         }

          /**
          * {@inheritDoc}
          */
          public  void onChildViewRemoved(View parent, View child) {
              if (parent == RadioGroup.this && child instanceof RadioButton) {
                 ((RadioButton) child).setOnCheckedChangeListener(null);
             }

              if (mOnHierarchyChangeListener != null) {
                 mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
             }
         }
     }
 }

其中的这一段是关键改写代码：

    @Override
 public void addView(final View child, int index, ViewGroup.LayoutParams params) {
     if (child instanceof RadioButton) {

         ((RadioButton) child).setOnTouchListener(new OnTouchListener() {

 @Override
 public boolean onTouch(View v, MotionEvent event) {
     ((RadioButton) child).setChecked(true);
     checkRadioButton((RadioButton) child);
     if(mOnCheckedChangeListener != null){
         mOnCheckedChangeListener.onCheckedChanged(RadioGroup.this, child.getId());
     }
     return true;
 }
 );

     } else if(child instanceof LinearLayout){
          int childCount = ((LinearLayout) child).getChildCount();
          for(int i = 0; i < childCount; i++){
             View view = ((LinearLayout) child).getChildAt(i);
              if (view  instanceof RadioButton) {
                  final RadioButton button = (RadioButton) view;


                 ((RadioButton) button).setOnTouchListener(new OnTouchListener() {

                      @Override
                      public  boolean onTouch(View v, MotionEvent event) {
                         ((RadioButton) button).setChecked(true);
                         checkRadioButton((RadioButton) button);
                          if(mOnCheckedChangeListener != null){
                             mOnCheckedChangeListener.onCheckedChanged(RadioGroup.this, button.getId());
                         }
                          return  true;
                     }
                 });

             }
         }
     }

     super.addView(child, index, params);
 }

 private void checkRadioButton(RadioButton radioButton){
     View child;
     int radioCount = getChildCount();
     for(int i = 0; i < radioCount; i++){
         child = getChildAt(i);
          if (child  instanceof RadioButton) {
              if(child == radioButton){
                  // do nothing
             }  else {
                 ((RadioButton) child).setChecked(false);
             }
         }  else if(child instanceof LinearLayout){
              int childCount = ((LinearLayout) child).getChildCount();
              for(int j = 0; j < childCount; j++){
                 View view = ((LinearLayout) child).getChildAt(j);
                  if (view  instanceof RadioButton) {
                      final RadioButton button = (RadioButton) view;
                      if(button == radioButton){
                          // do nothing
                     }  else {
                         ((RadioButton) button).setChecked(false);
                     }
                 }
             }
         }
     }
 }

布局文件我就不贴出来了。

实现结果如下图：