V2AS问路
【HarmonyOS】【xml】初学XML布局作业
阅读原文时间：2021年12月11日阅读：1

首先要明确，有两种布局方式

线性布局：DirectionalLayout

依赖布局：DependentLayout

好，接下来看一看下面的例子

代码如下：

<?xml version="1.0" encoding="utf-8"?>
<!--依赖布局-->
<DependentLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="#CCCCCC"
    >
<!--添加ListContainer标识多行数据    -->
        <ListContainer
            ohos:id="$+id:list_container"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:above="$id:layout_bottom"
            >
        </ListContainer>
<!--按钮子布局-->
        <DirectionalLayout
            ohos:id="$+id:layout_bottom"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:orientation="horizontal"
            ohos:align_parent_bottom="true"
            >
<!--            编辑城市按钮-->
            <Button
                ohos:id="$+id:button_edit"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:text="编辑城市"
                ohos:background_element="#1F69FF"
                ohos:text_color="#FFFFFF"
                ohos:text_size="24vp"
                ohos:weight="1"
                ohos:layout_alignment="bottom"
                />
<!--            添加城市按钮-->
            <Button
                ohos:id="$+id:button_add"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:text="添加城市"
                ohos:background_element="#FFFFFF"
                ohos:text_color="#1F69FF"
                ohos:text_size="24vp"
                ohos:weight="1"
                ohos:layout_alignment="bottom"
                />
    </DirectionalLayout>

</DependentLayout>


<?xml version="1.0" encoding="utf-8"?>
<!--依赖布局-->
<DependentLayout      //依赖布局
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="#CCCCCC"
    >
<!--添加ListContainer标识多行数据    -->
        <ListContainer
            ohos:id="$+id:list_container"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:above="$id:layout_bottom"   //让此组件下边缘与另一个组件的上边缘对齐
            >
        </ListContainer>
<!--按钮子布局-->
        <DirectionalLayout
            ohos:id="$+id:layout_bottom"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:orientation="horizontal"
            ohos:align_parent_bottom="true"   //将底边与父组件对齐
            >
<!--            编辑城市按钮-->
            <Button
                ohos:id="$+id:button_edit"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:text="编辑城市"
                ohos:background_element="#1F69FF"
                ohos:text_color="#FFFFFF"
                ohos:text_size="24vp"
                ohos:weight="1" //权重：1
                ohos:layout_alignment="bottom"    //对齐方式：底部对齐
                />
<!--            添加城市按钮-->
            <Button
                ohos:id="$+id:button_add"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:text="添加城市"
                ohos:background_element="#FFFFFF"
                ohos:text_color="#1F69FF"
                ohos:text_size="24vp"
                ohos:weight="1" //权重：1
                ohos:layout_alignment="bottom" //对齐方式：底部对齐
                />
    </DirectionalLayout>

</DependentLayout>

<?xml version="1.0" encoding="utf-8"?>
<DependentLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="#F5FFC3"
    ohos:orientation="vertical"
    >

<!--    线性布局 Picker-->
<DirectionalLayout
        ohos:height="match_parent"
        ohos:width="match_parent"
        ohos:orientation="horizontal"
        ohos:background_element="#FFAFF8CE"
        ohos:above="$id:layout_bottom"
        >
        <Picker
            ohos:id="$+id:picker_province"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1"
            ohos:normal_text_size="28vp"
            ohos:selected_text_size="48vp"
            ohos:normal_text_color="#FF6D6D6D"
            ohos:selected_text_color="#FF000000"
            ohos:top_line_element="#000000"
            ohos:bottom_line_element="#000000"
            ohos:layout_alignment="horizontal_center"
            />
        <Picker
            ohos:id="$+id:picker_city"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1"
            ohos:normal_text_size="28vp"
            ohos:selected_text_size="48vp"
            ohos:normal_text_color="#FF6D6D6D"
            ohos:selected_text_color="#FF000000"
            ohos:top_line_element="#000000"
            ohos:bottom_line_element="#000000"
            ohos:layout_alignment="horizontal_center"
            />
        <Picker
            ohos:id="$+id:picker_county"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1"
            ohos:normal_text_size="28vp"
            ohos:selected_text_size="48vp"
            ohos:normal_text_color="#FF6D6D6D"
            ohos:selected_text_color="#FF000000"
            ohos:top_line_element="#000000"
            ohos:bottom_line_element="#000000"
            ohos:layout_alignment="horizontal_center"
            />
    </DirectionalLayout>
<!--    线性布局 按钮-->
    <DirectionalLayout
        ohos:id="$+id:layout_bottom"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:orientation="horizontal"
        ohos:align_parent_bottom="true"
        >
        <!--            取消按钮-->
        <Button
            ohos:id="$+id:button_cancel"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:text="取消"
            ohos:background_element="#FFFFFF"
            ohos:text_color="#1F69FF"
            ohos:text_size="18vp"
            ohos:weight="1"
            ohos:layout_alignment="bottom"
            ohos:padding="5vp"
            />
        <!--            确定按钮-->
        <Button
            ohos:id="$+id:button_enter"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:text="确定"

            ohos:background_element="#1F69FF"
            ohos:text_color="#FFFFFF"
            ohos:text_size="18vp"
            ohos:weight="1"
            ohos:layout_alignment="bottom"
            ohos:padding="5vp"
            />

    </DirectionalLayout>

    </DependentLayout>



<?xml version="1.0" encoding="utf-8"?>
<DependentLayout  //依赖布局
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:background_element="#F5FFC3"
    ohos:orientation="vertical"   //子布局上下排列
    >

<!--    线性布局 Picker-->
<DirectionalLayout
        ohos:height="match_parent"
        ohos:width="match_parent"
        ohos:orientation="horizontal"  //子布局左右排列
        ohos:background_element="#FFAFF8CE"
        ohos:above="$id:layout_bottom"
        >
        <Picker
            ohos:id="$+id:picker_province"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1"
            ohos:normal_text_size="28vp"
            ohos:selected_text_size="48vp"
            ohos:normal_text_color="#FF6D6D6D"
            ohos:selected_text_color="#FF000000"
            ohos:top_line_element="#000000"              //顶部框线：颜色值
            ohos:bottom_line_element="#000000"           //底部框线：颜色值
            ohos:layout_alignment="horizontal_center"   //对齐方式：居中对齐
            />
        <Picker
            ohos:id="$+id:picker_city"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1"
            ohos:normal_text_size="28vp"
            ohos:selected_text_size="48vp"
            ohos:normal_text_color="#FF6D6D6D"
            ohos:selected_text_color="#FF000000"
            ohos:top_line_element="#000000"
            ohos:bottom_line_element="#000000"
            ohos:layout_alignment="horizontal_center"
            />
        <Picker
            ohos:id="$+id:picker_county"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1"
            ohos:normal_text_size="28vp"
            ohos:selected_text_size="48vp"
            ohos:normal_text_color="#FF6D6D6D"
            ohos:selected_text_color="#FF000000"
            ohos:top_line_element="#000000"
            ohos:bottom_line_element="#000000"
            ohos:layout_alignment="horizontal_center"
            />
    </DirectionalLayout>
<!--    线性布局 按钮-->
    <DirectionalLayout
        ohos:id="$+id:layout_bottom"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:orientation="horizontal"
        ohos:align_parent_bottom="true"     //此组件底线与父组件底线对齐
        >
        <!--            取消按钮-->
        <Button
            ohos:id="$+id:button_cancel"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:text="取消"
            ohos:background_element="#FFFFFF"
            ohos:text_color="#1F69FF"
            ohos:text_size="18vp"
            ohos:weight="1"
            ohos:layout_alignment="bottom"
            ohos:padding="5vp"
            />
        <!--            确定按钮-->
        <Button
            ohos:id="$+id:button_enter"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:text="确定"

            ohos:background_element="#1F69FF"
            ohos:text_color="#FFFFFF"
            ohos:text_size="18vp"
            ohos:weight="1"
            ohos:layout_alignment="bottom"
            ohos:padding="5vp"
            />

    </DirectionalLayout>

    </DependentLayout>

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">
<Text
    ohos:height="match_content"
    ohos:width="match_content"
    ohos:text_size="18vp"
    ohos:top_margin="20vp"
    ohos:text="地区"
    />
    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:text_size="18vp"
        ohos:top_margin="20vp"
        ohos:text="温度"
        />
    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:text_size="18vp"
        ohos:top_margin="20vp"
        ohos:text="天气"
        />
</DirectionalLayout>


<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout   //线性布局
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">  //上下布局
<Text
    ohos:height="match_content"
    ohos:width="match_content"
    ohos:text_size="18vp"
    ohos:top_margin="20vp"  //顶部边距
    ohos:text="地区"
    />
    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:text_size="18vp"
        ohos:top_margin="20vp"
        ohos:text="温度"
        />
    <Text
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:text_size="18vp"
        ohos:top_margin="20vp"
        ohos:text="天气"
        />
</DirectionalLayout>

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