自定义RadioGroup，来实现group里嵌套布局
代码如下
/*
*
* 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 CONDITI OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and
*
* limitations under the License.
*/
package com.xiaohuoban.view;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.RadioButton;
public class MyRadioGroup extends LinearLayout
{
// holds the checked id; the ion 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;
public MyRadioGroup(Context context)
{
super(context);
setOrientation(LinearLayout.VERTICAL);
init();
}
public MyRadioGroup(Context context, AttributeSet attrs)
{
super(context, attrs);
init();
}
private void init()
{
mChildOnCheckedChangeListener = new CheckedStateTracker();
mPassThroughListener = new PassThroughHierarchyChangeListener();
super.setOnHierarchyChangeListener(mPassThroughListener);
}
@Override
public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener)
{
// the user listener is delegated to our pass-through listener
mPassThroughListener.mOnHierarchyChangeListener = listener;
}
@Override
protected void onFinishInflate()
{
if (mCheckedId != -1)
{
mProtectFromCheckedChange = true;
setCheckedStateForView(mCheckedId, true);
mProtectFromCheckedChange = false;
setCheckedId(mCheckedId);
}
}
@Override
public void addView(View child, int index, ViewGroup.LayoutParams params)
{
if (child instanceof RadioButton)
{
final RadioButton button = (RadioButton) child;
if (button.isChecked())
{
mProtectFromCheckedChange = true;
if (mCheckedId != -1)
{
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
setCheckedId(button.getId());
}
}
else if (child instanceof ViewGroup)
{
final RadioButton button = findRadioButton((ViewGroup) child);
if (button.isChecked())
{
mProtectFromCheckedChange = true;
if (mCheckedId != -1)
{
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
setCheckedId(button.getId());
}
}
super.addView(child, index, params);
}
/** 查找radioButton控件 */
public RadioButton findRadioButton(ViewGroup group)
{
RadioButton resBtn = null;
int len = group.getChildCount();
for (int i = 0; i < len; i++)
{
if (group.getChildAt(i) instanceof RadioButton)
{
resBtn = (RadioButton) group.getChildAt(i);
}
else if (group.getChildAt(i) instanceof ViewGroup)
{
findRadioButton((ViewGroup) group.getChildAt(i));
}
}
return resBtn;
}
/**
*
*
*
* Sets the ion to the radio button whose identifier is passed in
*
* parameter. Using -1 as the ion identifier clears the ion;
*
* such an operation is equivalent to invoking {@link ＃clearCheck()}.
*
*
*
*
*
* @param id
*
* the unique id of the radio button to 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;
if (mOnCheckedChangeListener != null)
{
mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
}
}
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 ed radio button in this group. Upon
*
* empty ion, the returned value is -1.
*
*
*
*
*
* @return the unique id of the ed radio button in this group
*
*
*
* @see ＃check(int)
*
* @see ＃clearCheck()
*/
public int getCheckedRadioButtonId()
{
return mCheckedId;
}
/**
*
*
*
* Clears the ion. When the ion is cleared, no radio button in
*
* this group is ed 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 MyRadioGroup.LayoutParams(getContext(), attrs);
}
/**
*
* {@inheritDoc}
*/
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p)
{
return p instanceof MyRadioGroup.LayoutParams;
}
@Override
protected LinearLayout.LayoutParams generateDefaultLayoutParams()
{
return new LayoutParams(
android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT);
}
/**
*
*
*
* 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 the XML file.
*
*
*
*
*
*
*
* See {@link android.R.styleable＃LinearLayout_Layout LinearLayout
*
* Attributes} for a list of all child view attributes that this class
*
* supports.
*
*
*
*
*/
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 = android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
}
if (a.hasValue(heightAttr))
{
height = a.getLayoutDimension(heightAttr, "layout_height");
}
else
{
height = android.view.ViewGroup.LayoutParams.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 ion
*
* 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
*/
public void onCheckedChanged(MyRadioGroup group, int checkedId);
}
private class CheckedStateTracker implements
CompoundButton.OnCheckedChangeListener
{
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked)
{
// prevents 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;
@Override
public void onChildViewAdded(View parent, View child)
{
if (parent == MyRadioGroup.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);
}
else if (parent == MyRadioGroup.this && child instanceof ViewGroup)
{
RadioButton btn = findRadioButton((ViewGroup) child);
int id = btn.getId();
// generates an id if it""s missing
if (id == View.NO_ID)
{
id = btn.hashCode();
btn.setId(id);
}
btn.setOnCheckedChangeListener(mChildOnCheckedChangeListener);
}
if (mOnHierarchyChangeListener != null)
{
mOnHierarchyChangeListener.onChildViewAdded(parent, child);
}
}
@Override
public void onChildViewRemoved(View parent, View child)
{
if (parent == MyRadioGroup.this && child instanceof RadioButton)
{
((RadioButton) child).setOnCheckedChangeListener(null);
}
else if (parent == MyRadioGroup.this && child instanceof ViewGroup)
{
findRadioButton((ViewGroup) child).setOnCheckedChangeListener(
null);
}
if (mOnHierarchyChangeListener != null)
{
mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
}
}
}
}