<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <!-- 输入键盘 -->
    <GridView
        android:id="@+id/gv_keybord"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="#bdbdbd"
        android:horizontalSpacing="1px"
        android:numColumns="3"
        android:verticalSpacing="1px" />

    <View
        android:id="@+id/line"
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:layout_above="@id/gv_keybord"
        android:background="#bdbdbd" />

    <RelativeLayout
        android:id="@+id/layoutBack"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@id/line"
        android:background="#f5f5f5"
        android:padding="@dimen/dp_10">

        <ImageView
            android:id="@+id/imgBack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:src="@mipmap/keyboard_back_img" />

    </RelativeLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:layout_above="@id/layoutBack"
        android:layout_marginTop="@dimen/dp_1"
        android:background="#bdbdbd" />

</RelativeLayout>