Android如何实现RadioGroup跨多行显示

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示例：

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;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) {   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;     button.setOnTouchListener(new OnTouchListener() {      @Override      public boolean onTouch(View v, MotionEvent event) {       button.setChecked(true);       checkRadioButton(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 {       button.setChecked(false);      }     }    }   }  } } /**  * 
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()}.
  *  * @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);  } } /**  * 
Returns the identifier of the selected radio button in this group.  * Upon empty selection, the returned value is -1.
  *  * @return the unique id of the selected radio button in this group  * @attr ref android.R.styleable#RadioGroup_checkedButton  * @see #check(int)  * @see #clearCheck()  */ public int getCheckedRadioButtonId() {  return mCheckedId; } /**  * 
Clears the selection. When the selection is cleared, no radio button  * in this group is selected and {@link #getCheckedRadioButtonId()} returns  * null.
  *  * @see #check(int)  * @see #getCheckedRadioButtonId()  */ public void clearCheck() {  check(-1); } /**  * 
Register a callback to be invoked when the checked radio button  * changes in this group.
  *  * @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()); } 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);  }  /**   * 
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.
   *   * @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;   }  } } /**  * 
Interface definition for a callback to be invoked when the checked  * radio button changed in this group.
  */ public interface OnCheckedChangeListener {  /**   * 
Called when the checked radio button has changed. When the   * selection is cleared, checkedId is -1.
   *   * @param group  the group in which the checked radio button has changed   * @param checkedId the unique identifier of the newly checked radio button   */  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);  } } /**  * 
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.
  */ 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);   }  } }}

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