package com.hz.w504_sing_common;

import java.util.ArrayList;

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;

/** 可以放多种布局控件，能找到radiobutton */

public class FlowRadioGroup extends LinearLayout {

    // holds the checked id; the selection is empty by default

    private int mCheckedId = -;

    // 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;

    // 存放当前的radioButton

    private ArrayList<RadioButton> radioButtons;

    public FlowRadioGroup(Context context) {

        super(context);

        setOrientation(VERTICAL);

        init();

    }

    public FlowRadioGroup(Context context, AttributeSet attrs) {

        super(context, attrs);

        init();

    }

    private void init() {

        mChildOnCheckedChangeListener = new CheckedStateTracker();

        mPassThroughListener = new PassThroughHierarchyChangeListener();

        super.setOnHierarchyChangeListener(mPassThroughListener);

        radioButtons = new ArrayList<RadioButton>();

    }

    @Override

    public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {

        // the user listener is delegated to our pass-through listener

        mPassThroughListener.mOnHierarchyChangeListener = listener;

    }

    @Override

    protected void onFinishInflate() {

        super.onFinishInflate();

        // checks the appropriate radio button as requested in the XML file

        if (mCheckedId != -) {

            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;

            radioButtons.add(button);

            if (button.isChecked()) {

                mProtectFromCheckedChange = true;

                if (mCheckedId != -) {

                    setCheckedStateForView(mCheckedId, false);

                }

                mProtectFromCheckedChange = false;

                setCheckedId(button.getId());

            }

        } else if (child instanceof ViewGroup) {// 如果是复合控件

            // 遍历复合控件

            ViewGroup vg = ((ViewGroup) child);

            setCheckedView(vg);

        }

        super.addView(child, index, params);

    }

    /** 查找复合控件并设置radiobutton */

    private void setCheckedView(ViewGroup vg) {

        int len = vg.getChildCount();

        for (int i = ; i < len; i++) {

            if (vg.getChildAt(i) instanceof RadioButton) {// 如果找到了，就设置check状态

                final RadioButton button = (RadioButton) vg.getChildAt(i);

                // 添加到容器

                radioButtons.add(button);

                if (button.isChecked()) {

                    mProtectFromCheckedChange = true;

                    if (mCheckedId != -) {

                        setCheckedStateForView(mCheckedId, false);

                    }

                    mProtectFromCheckedChange = false;

                    setCheckedId(button.getId());

                }

            } else if (vg.getChildAt(i) instanceof ViewGroup) {// 迭代查找并设置

                ViewGroup childVg = (ViewGroup) vg.getChildAt(i);

                setCheckedView(childVg);

            }

        }

    }

    /** 查找复合控件并设置id */

    private void setCheckedId(ViewGroup vg) {

        int len = vg.getChildCount();

        for (int i = ; i < len; i++) {

            if (vg.getChildAt(i) instanceof RadioButton) {// 如果找到了，就设置check状态

                final RadioButton button = (RadioButton) vg.getChildAt(i);

                int id = button.getId();

                // generates an id if it's missing

                if (id == View.NO_ID) {

                    id = button.hashCode();

                    button.setId(id);

                }

                button.setOnCheckedChangeListener(mChildOnCheckedChangeListener);

            } else if (vg.getChildAt(i) instanceof ViewGroup) {// 迭代查找并设置

                ViewGroup childVg = (ViewGroup) vg.getChildAt(i);

                setCheckedId(childVg);

            }

        }

    }

    /** 查找radioButton控件 */

    public RadioButton findRadioButton(ViewGroup group) {

        RadioButton resBtn = null;

        int len = group.getChildCount();

        for (int i = ; i < len; i++) {

            if (group.getChildAt(i) instanceof RadioButton) {

                resBtn = (RadioButton) group.getChildAt(i);

            } else if (group.getChildAt(i) instanceof ViewGroup) {

                resBtn = findRadioButton((ViewGroup) group.getChildAt(i));

                findRadioButton((ViewGroup) group.getChildAt(i));

                break;

            }

        }

        return resBtn;

    }

    /** 返回当前radiobutton控件的count */

    public int getRadioButtonCount() {

        return radioButtons.size();

    }

    /** 返回当前index的radio */

    public RadioButton getRadioButton(int index) {

        return radioButtons.get(index);

    }    

    /**

     * <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 != - && (id == mCheckedId)) {

            return;

        }

        if (mCheckedId != -) {

            setCheckedStateForView(mCheckedId, false);

        }

        if (id != -) {

            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);

        }

    }

    /**

     * <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()

     */

    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(-);

    }

    /**

     * <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 FlowRadioGroup.LayoutParams(getContext(), attrs);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {

        return p instanceof FlowRadioGroup.LayoutParams;

    }

    @Override

    protected LinearLayout.LayoutParams generateDefaultLayoutParams() {

        return new LayoutParams(LayoutParams.WRAP_CONTENT,

                LayoutParams.WRAP_CONTENT);

    }

    /**

     * <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(FlowRadioGroup 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 != -) {

                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;

        public void onChildViewAdded(View parent, View child) {

            if (parent == FlowRadioGroup.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 == FlowRadioGroup.this

                    && child instanceof ViewGroup) {// 如果是复合控件

                // 查找并设置id

                setCheckedId((ViewGroup) child);

            }

            if (mOnHierarchyChangeListener != null) {

                mOnHierarchyChangeListener.onChildViewAdded(parent, child);

            }

        }

        public void onChildViewRemoved(View parent, View child) {

            if (parent == FlowRadioGroup.this && child instanceof RadioButton) {

                ((RadioButton) child).setOnCheckedChangeListener(null);

            } else if (parent == FlowRadioGroup.this

                    && child instanceof ViewGroup) {

                findRadioButton((ViewGroup) child).setOnCheckedChangeListener(

                        null);

            }

            if (mOnHierarchyChangeListener != null) {

                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);

            }

        }

    }

}

<com.hz.w504_sing_common.FlowRadioGroup

        android:id="@+id/radioGroup"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"  >

        <LinearLayout

            android:layout_marginTop="10dip"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:orientation="horizontal" >

                <RadioButton

                    android:layout_width="0dip"

                    android:layout_weight=""

                    android:layout_height="wrap_content"

                    android:text="" />

                <RadioButton

                    android:layout_width="0dip"

                    android:layout_weight=""

                    android:layout_height="wrap_content"

                    android:text="" />

                <RadioButton

                    android:layout_width="0dip"

                    android:layout_weight=""

                    android:layout_height="wrap_content"

                    android:text="" />

                <RadioButton

                    android:layout_width="0dip"

                    android:layout_weight=""

                    android:layout_height="wrap_content"

                    android:text="" />

        </LinearLayout>

        <LinearLayout

            android:layout_marginTop="10dip"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:orientation="horizontal" >

            <RadioButton

                android:layout_width="0dip"

                android:layout_weight=""

                android:layout_height="wrap_content"

                android:text="" />

            <RadioButton 

                android:layout_width="0dip"

                android:layout_weight=""

                android:layout_height="wrap_content"

                android:text="" />

            <RadioButton

                android:layout_width="0dip"

                android:layout_weight=""

                android:layout_height="wrap_content"

                android:text="" />

            <RadioButton

                android:layout_width="0dip"

                android:layout_weight=""

                android:layout_height="wrap_content"

                android:text="" />

        </LinearLayout>

    </com.hz.w504_sing_common.FlowRadioGroup>