Android RadioGroup 横向显示（X行X列）

原文RadioGroup多行显示
参考：参考文章（在模拟器不兼容）
效果图应该是：
在这里插入图片描述
模拟器如下图：
Android RadioGroup 横向显示（X行X列）_第1张图片
核心代码
import android.annotation.SuppressLint;import android.content.Context;import android.content.res.TypedArray;import android.os.Build;import android.util.AttributeSet;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;import java.util.ArrayList;import java.util.List;public class MultiLineRadioGroup 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 MultiLineRadioGroup(Context context) {        super(context);        setOrientation(VERTICAL);        init();    }    /**     * {@inheritDoc}     */    public MultiLineRadioGroup(Context context, AttributeSet attrs) {        super(context, attrs);        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;    }    /**     * set the default checked radio button, without notification the listeners     */    public void setCheckWithoutNotif(int id) {        if (id != -1 && (id == mCheckedId)) {            return;        }        mProtectFromCheckedChange = true;        if (mCheckedId != -1) {            setCheckedStateForView(mCheckedId, false);        }        if (id != -1) {            setCheckedStateForView(id, true);        }        mCheckedId = id;        mProtectFromCheckedChange = false;    }    @Override    public void addView(View child, int index, ViewGroup.LayoutParams params) {        List btns = getAllRadioButton(child);        if (btns != null && btns.size() > 0) {            for (RadioButton button : btns) {                if (button.isChecked()) {                    mProtectFromCheckedChange = true;                    if (mCheckedId != -1) {                        setCheckedStateForView(mCheckedId, false);                    }                    mProtectFromCheckedChange = false;                    setCheckedId(button.getId());                }            }        }        super.addView(child, index, params);    }    /**     * get all radio buttons which are in the view     *     * @param child     */    private List getAllRadioButton(View child) {        List btns = new ArrayList();        if (child instanceof RadioButton) {            btns.add((RadioButton) child);        } else if (child instanceof ViewGroup) {            int counts = ((ViewGroup) child).getChildCount();            for (int i = 0; i < counts; i++) {                btns.addAll(getAllRadioButton(((ViewGroup) child).getChildAt(i)));            }        }        return btns;    }    /**     * 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;        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 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#MyRadioGroup_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 MultiLineRadioGroup.LayoutParams(getContext(), attrs);    }    /**     * {@inheritDoc}     */    @Override    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {        return p instanceof MultiLineRadioGroup.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(MultiLineRadioGroup.class.getName());    }    @Override    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {        super.onInitializeAccessibilityNodeInfo(info);        info.setClassName(MultiLineRadioGroup.class.getName());    }    /**     * 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.
     *      * 
See     * 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 = 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         */        public void onCheckedChanged(MultiLineRadioGroup 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}         */        @SuppressLint("NewApi")        public void onChildViewAdded(View parent, View child) {            if (parent == MultiLineRadioGroup.this) {                List btns = getAllRadioButton(child);                if (btns != null && btns.size() > 0) {                    for (RadioButton btn : btns) {                        int id = btn.getId();                        // generates an id if it's missing                        if (id == View.NO_ID && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {                            id = View.generateViewId();                            btn.setId(id);                        }                        btn.setOnCheckedChangeListener(                                mChildOnCheckedChangeListener);                    }                }            }            if (mOnHierarchyChangeListener != null) {                mOnHierarchyChangeListener.onChildViewAdded(parent, child);            }        }        /**         * {@inheritDoc}         */        public void onChildViewRemoved(View parent, View child) {            if (parent == MultiLineRadioGroup.this) {                List btns = getAllRadioButton(child);                if (btns != null && btns.size() > 0) {                    for (RadioButton btn : btns) {                        btn.setOnCheckedChangeListener(null);                    }                }            }            if (mOnHierarchyChangeListener != null) {                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);            }        }    }}
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