setOnCheckedChangeListener 他的监听原理是什么啊?
传入一个RadioGroup.OnCheckedChangeListener 内部接口类，（实现这个接口类中的onCheckedChanged方法。）
setOnCheckedChangeListener 的底层源码是什么啊？
android API中的介绍
他是怎么调用传进来的这个接口类中的onCheckedChanged方法的??
这个onCheckedChanged 方法需要向里面传入两个参数 RadioGroup group 和 int checkedId..他是怎么传入的？？
说白了 我就是不是很明白 这个回调函数的原理，或者说 这个回调函数的原理是怎么在这个类中体现的。。
或者说是 我理解错了
public void setOnHierarchyChangeListener (ViewGroup.OnHierarchyChangeListener listener)
Since: API Level 1 Register a callback to be invoked when a child is added to or removed from this view.
Parameters
listener the callback to invoke on hierarchy change
他这句话的意思是说setOnHierarchyChangeListener 是回调函数 还是说
ViewGroup.OnHierarchyChangeListener listener中的onCheckedChanged 方法是回调函数呢？
希望高收帮忙解答一下，纠结一下午了。。
------解决方案--------------------
这个是android系统radiogroup的源码，你可以参考研究研究。
/*
* 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 com.android.internal.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
* <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 [email protected] android.R.styleable#RadioGroup RadioGroup Attributes},
* [email protected] android.R.styleable#LinearLayout LinearLayout Attributes},
* [email protected] android.R.styleable#ViewGroup ViewGroup Attributes},
* [email protected] android.R.styleable#View View Attributes}</p>
* <p>Also see
* [email protected] 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;