可以实现复合控件单选的radioButton

开发中经常会遇到无良UI设计出一些莫名其妙 极度奇葩的单选按钮。android系统原生的radioButton虽然可以修改button属性和drawable属性做一些改变，但是依然不能很好的满足需求。

这时一般会考虑用复合的布局，其中嵌套了radioButton。虽然形式上满足了需求，但是这种布局放进radioGroup中 无法实现单选。

下面是从网上搬运的代码，自定义radioGroup可以自由嵌套，并实现单选。感谢原创大神。本屌仅仅搬运过来做个记录。

package com.example.minshengdemo.coustem;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 MyRadioGroup 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;    // 存放当前的radioButton    private ArrayList<RadioButton> radioButtons;    public MyRadioGroup(Context context) {        super(context);        setOrientation(VERTICAL);        init();    }    public MyRadioGroup(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 != -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;            radioButtons.add(button);            if (button.isChecked()) {                mProtectFromCheckedChange = true;                if (mCheckedId != -1) {                    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 = 0; 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 != -1) {                        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 = 0; 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 = 0; 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 != -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);        }    }    /**     * <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(-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 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(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(MyRadioGroup 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;        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) {// 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 == 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);            }        }    }}