自定义支持多行显示的RadioGroup

原生的RadioGroup继承自LinearLayout，即只能支持一横排或者一竖排的排列显示RadioButton

现在改写RadioGroup，使它支持多行多列排布RadioButton，效果图如下

效果图

重写RadioGroup

package com.kongqw.radiogroupdemo;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;

/**
 * Created by kongqw on 2016/2/18.
 */
public class MyRadioGroup extends RadioGroup {

    private OnCheckedChangeListener mOnCheckedChangeListener;

    public MyRadioGroup(Context context) {
        super(context);
    }

    public MyRadioGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }

    @Override
    public void addView(final View child, int index, ViewGroup.LayoutParams params) {
        if (child instanceof LinearLayout) {
            int childCount = ((LinearLayout) child).getChildCount();
            for (int i = 0; i < childCount; i++) {
                View view = ((LinearLayout) child).getChildAt(i);
                if (view instanceof RadioButton) {
                    final RadioButton button = (RadioButton) view;
                    ((RadioButton) button).setOnTouchListener(new OnTouchListener() {

                        @Override
                        public boolean onTouch(View v, MotionEvent event) {
                            ((RadioButton) button).setChecked(true);
                            checkRadioButton((RadioButton) button);
                            if (mOnCheckedChangeListener != null) {
                                mOnCheckedChangeListener.onCheckedChanged(MyRadioGroup.this, button.getId());
                            }
                            return true;
                        }
                    });
                }
            }
        }

        super.addView(child, index, params);
    }

    private void checkRadioButton(RadioButton radioButton) {
        View child;
        int radioCount = getChildCount();
        for (int i = 0; i < radioCount; i++) {
            child = getChildAt(i);
            if (child instanceof RadioButton) {
                if (child == radioButton) {
                    // do nothing
                } else {
                    ((RadioButton) child).setChecked(false);
                }
            } else if (child instanceof LinearLayout) {
                int childCount = ((LinearLayout) child).getChildCount();
                for (int j = 0; j < childCount; j++) {
                    View view = ((LinearLayout) child).getChildAt(j);
                    if (view instanceof RadioButton) {
                        final RadioButton button = (RadioButton) view;
                        if (button == radioButton) {
                            // do nothing
                        } else {
                            ((RadioButton) button).setChecked(false);
                        }
                    }
                }
            }
        }
    }
}

布局

RadioGroup里面还可以包裹一层LinearLayout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.kongqw.radiogroupdemo.MainActivity">

    <com.kongqw.radiogroupdemo.MyRadioGroup
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="C" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="C++" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Java" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="OC" />
        </LinearLayout>
    </com.kongqw.radiogroupdemo.MyRadioGroup>
</RelativeLayout>