android 05 桢布局：FrameLayout 网格布据 GridLayout

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="128dp"
        android:layout_height="128dp"
        android:src="@drawable/p03"/>        图片
    <ImageView 
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:src="@drawable/p02"/>
    <ImageView 
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:src="@drawable/p01"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:textColor="#000"
        android:text="查看图片"
        android:layout_gravity="bottom|center_horizontal"/>
</FrameLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnCount="5"                    跨列
        android:orientation="horizontal" >

        <TextView android:text="用户名" />

        <EditText
            android:layout_columnSpan="4"                   跨行
            android:layout_gravity="fill_horizontal"
            android:hint="2-10个字符" />

        <TextView android:text="密   码" />

        <EditText
            android:layout_columnSpan="4"
            android:layout_gravity="fill_horizontal"
            android:hint="2-10个字符" />
    </GridLayout>

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnCount="5"
        android:orientation="horizontal" 
        android:layout_marginTop="20dp">

        <Button
            android:text="不"
            android:visibility="invisible" />

        <Button
            android:background="@drawable/btn_bg"
            android:drawableLeft="@drawable/login32x32"
            android:text="登陆" 
            android:textColor="#fff"/>

        <Button
            android:text="不"
            android:visibility="invisible" />

        <Button
            android:background="@drawable/btn_bg"
            android:drawableLeft="@drawable/exit32x32"
            android:text="退出" 
            android:textColor="#fff"/>

        <Button
            android:text="不"
            android:visibility="invisible" 
            />
    </GridLayout>

</LinearLayout>