android selector shape 使用

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true">
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="10.0dp" android:bottomRightRadius="0.0dp" android:topLeftRadius="10.0dp" android:topRightRadius="0.0dp" />
            <solid android:color="@color/orange" />
        </shape>
    </item>
    <item android:state_pressed="true">
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="10.0dp" android:bottomRightRadius="0.0dp" android:topLeftRadius="10.0dp" android:topRightRadius="0.0dp" />
            <solid android:color="@color/orange" />
        </shape>
    </item>
    <item android:state_checked="true">
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="10.0dp" android:bottomRightRadius="0.0dp" android:topLeftRadius="10.0dp" android:topRightRadius="0.0dp" />
            <solid android:color="@color/orange" />
        </shape>
    </item>
    <item>
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="10.0dp" android:bottomRightRadius="0.0dp" android:topLeftRadius="10.0dp" android:topRightRadius="0.0dp" />

            <solid android:color="@color/white"/></shape>
    </item>
</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true">
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="0.0dp" android:bottomRightRadius="10.0dp" android:topLeftRadius="0.0dp" android:topRightRadius="10.0dp" />
            <solid android:color="@color/orange" />
        </shape>
    </item>
    <item android:state_pressed="true">
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="0.0dp" android:bottomRightRadius="10.0dp" android:topLeftRadius="0.0dp" android:topRightRadius="10.0dp" />
            <solid android:color="@color/orange" />
        </shape>
    </item>
    <item android:state_checked="true">
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="0.0dp" android:bottomRightRadius="10.0dp" android:topLeftRadius="0.0dp" android:topRightRadius="10.0dp" />
            <solid android:color="@color/orange" />
        </shape>
    </item>
    <item>
        <shape>
            <size android:width="69.0dp" android:height="27dp" />
            <!-- 线的宽度，颜色灰色 -->
            <stroke android:width="0.5dp" android:color="@color/orange"></stroke>
            <!-- 矩形的圆角半径 -->
            <corners android:bottomLeftRadius="0.0dp" android:bottomRightRadius="10.0dp" android:topLeftRadius="0.0dp" android:topRightRadius="10.0dp" />

            <solid android:color="@color/white" />
        </shape>
    </item>
</selector>

 <RadioGroup
            android:id="@id/rg_group"
            android:layout_width="138.0dp"
            android:layout_height="27.0dp"
            android:layout_centerInParent="true"
            android:orientation="horizontal">

            <RadioButton
                android:id="@id/rbtn_message"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:button="@null"
                android:checked="true"
                android:gravity="center"
                android:background="@drawable/message_toolbar_left_bg_selector"
                android:text="标题1"
                android:textColor="@color/message_toolbar_font_color" />

            <RadioButton
                android:id="@id/rbtn_chat_room"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:button="@null"
                android:gravity="center"
                android:background="@drawable/message_toolbar_right_bg_selector"
                android:text="标题2"
                android:textColor="@color/message_toolbar_font_color" />
        </RadioGroup>