致读者
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编写第一个页面
1、在“Project”
窗口,点击 “entry > src > main > resources > base > layout”
,打开“ability_main.xml”
文件。
image.png
2、在“ability_main.xml”
文件中创建一个文本和一个按钮,示例代码如下:
<?xml version="1.0" encoding="utf-8"?>
<DependentLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:width="match_parent"
ohos:height="match_parent"
ohos:background_element="#FFFFFF">
<Text
ohos:id="$+id:text"
ohos:width="match_content"
ohos:height="match_content"
ohos:text="Hello World"
ohos:text_color="#000000"
ohos:text_size="32fp"
ohos:center_in_parent="true"/>
<Button
ohos:id="$+id:button"
ohos:width="match_content"
ohos:height="match_content"
ohos:text="Next"
ohos:text_size="19fp"
ohos:text_color="#FFFFFF"
ohos:top_padding="8vp"
ohos:bottom_padding="8vp"
ohos:right_padding="70vp"
ohos:left_padding="70vp"
ohos:background_element="$graphic:background_button"
ohos:center_in_parent="true"
ohos:align_parent_bottom="true"
ohos:bottom_margin="40vp"/>
</DependentLayout>
3、上述按钮的背景是通过“background_button”
来显示的。右键点击“graphic”
文件夹,选择“New > File”
,命名为“background_button.xml”
。
image.png
“background_button.xml”
的示例代码如下(如果DevEco Studio提示xmlns字段错误,请忽略,不影响后续操作):
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:shape="rectangle">
<corners
ohos:radius="100"/>
<solid
ohos:color="#007DFF"/>
</shape>
4、在“Project”
窗口,选择“entry > src > main > java > com.example.myapplication > slice”
,打开“MainAbilitySlice.java”
文件,使用setUIContent
方法加载XML
布局,示例代码如下:
package com.example.myapplication.slice;
import com.example.myapplication.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
public class MainAbilitySlice extends AbilitySlice {
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setUIContent(ResourceTable.Layout_ability_main); // 加载XML布局
}
@Override
public void onActive() {
super.onActive();
}
@Override
public void onForeground(Intent intent) {
super.onForeground(intent);
}
}
说明:
如果DevEco Studio提示Layout_ability_main错误,点击菜单栏的“Build”,选择“Build App(s)/Hap(s) > Build Debug Hap(s) ”,即可消除报错。
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