android自定义RadioGroup实现可以添加多种布局

                           本文转载自博客    http://www.cnblogs.com/Jaylong/p/radiogroup.html    

android自带的RadioGroup是继承自LinearLayout，如果布局的时候不是直接写radiobutton,即radiobutton外面还包了一层容器，这时分组是不成功的，因为查找不到radiobutton,如果要实现这种效果呢，于是看了RadioGroup的源码，发现问题在于addView方法和自定义的PassThroughHierarchyChangeListener；

下面就这两个地方动手脚，先拷贝源码，然后去掉RadioGroup(Context context, AttributeSet attrs) 中的方法，我新增了一个方法，查找viewGroup控件中的radioButton。

/** 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) {
                findRadioButton((ViewGroup) group.getChildAt(i));
            }
        }
        return resBtn;
    }

addView的实现如下：

@Override
 2     public void addView(View child, int index, ViewGroup.LayoutParams params) {
 3         if (child instanceof RadioButton) {
 4             final RadioButton button = (RadioButton) child;
 5             if (button.isChecked()) {
 6                 mProtectFromCheckedChange = true;
 7                 if (mCheckedId != -1) {
 8                     setCheckedStateForView(mCheckedId, false);
 9                 }
10                 mProtectFromCheckedChange = false;
11                 setCheckedId(button.getId());
12             }
13         } else if (child instanceof ViewGroup) {  //这里是我添加的代码
14             final RadioButton button = findRadioButton((ViewGroup) child);
15             if (button.isChecked()) {
16                 mProtectFromCheckedChange = true;
17                 if (mCheckedId != -1) {
18                     setCheckedStateForView(mCheckedId, false);
19                 }
20                 mProtectFromCheckedChange = false;
21                 setCheckedId(button.getId());
22             }
23         }
24 
25         super.addView(child, index, params);
26     }

然后在自定义的PassThroughHierarchyChangeListener中修改：

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   //这里是我添加的代码
                    && child instanceof ViewGroup) {
                RadioButton btn = findRadioButton((ViewGroup) child);
                int id = btn.getId();
                // generates an id if it's missing
                if (id == View.NO_ID) {
                    id = btn.hashCode();
                    btn.setId(id);
                }
                btn.setOnCheckedChangeListener(mChildOnCheckedChangeListener);
            }

            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);
            }
        }
    }

做好了上面的步骤，下面布局就可以按照自己的意思来了，并且分组效果也不会影响

下面我的布局文件demo：

<com.huaheng.wy.view.MyRadioGroup
        android:id="@+id/rg"
        android:layout_width="fill_parent"
        android:layout_height="65dp"
        android:layout_alignParentBottom="true"
        android:background="@drawable/yst_i_bottom"
        android:orientation="horizontal" >

        

        <FrameLayout
            android:id="@+id/left"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1" >

            <RadioButton
                android:id="@+id/rbtn_home"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:background="@null"
                android:button="@null"
                android:drawableTop="@drawable/yst_i_bottomhome_selector"
                android:gravity="center_horizontal"
                android:text="首页"
                android:textColor="@color/white"
                android:textSize="@dimen/font_5" />

            <Button
                android:id="@+id/btn_home_point"
                android:layout_width="21dp"
                android:layout_height="20dp"
                android:layout_gravity="top|right"
                android:layout_marginRight="10dp"
                android:layout_marginTop="0dp"
                android:background="@drawable/notice_bg"
                android:text="1"
                android:textColor="@color/white"
                android:textSize="@dimen/font_6"
                android:visibility="gone" />
        FrameLayout>
        

        <RadioButton
            android:id="@+id/rbtn_his"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1"
            android:background="@null"
            android:button="@null"
            android:drawableTop="@drawable/yst_i_bottomhis_selector"
            android:gravity="center_horizontal"
            android:text="历史"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />

        

        <Button
            android:id="@+id/rbtn_scan"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="@drawable/scan_selector"
            android:button="@null"
            android:gravity="center_horizontal|bottom"
            android:paddingBottom="7dp"
            android:text="扫描"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />

        <RadioButton
            android:id="@+id/rbtn_seek"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1"
            android:background="@null"
            android:button="@null"
            android:drawableTop="@drawable/yst_i_bottomseek_selector"
            android:gravity="center_horizontal"
            android:text="搜索"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />

        <RadioButton
            android:id="@+id/rbtn_more"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1"
            android:background="@null"
            android:button="@null"
            android:drawableTop="@drawable/yst_i_bottommore_selector"
            android:gravity="center_horizontal"
            android:text="更多"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />
    com.huaheng.wy.view.MyRadioGroup>