
回复
1.页面布局
这一步中需要使用到一个标签,标签是图片控件,我们可以通过设置标签中图片的改变来标志点赞与取消点赞的状态,此外由于我们需要双击屏幕,这个时候我们需要使用到控件最外层的DirectionalLayout控件,因此我们给DirectionalLayout控件添加ID,便于定位。
<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
ohos:id="$+id:ld"
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_parent"
ohos:width="match_parent"
ohos:alignment="center"
ohos:orientation="vertical">
//设置图片
<Image
ohos:id="$+id:img"
ohos:height="match_content"
ohos:width="match_content"
ohos:max_height="600px"
ohos:max_width="300px"
ohos:background_element="cyan"
ohos:image_src="$media:xin_off"
/>
</DirectionalLayout>
package com.example.myapplication.slice;
import com.example.myapplication.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Component;
import ohos.agp.components.DirectionalLayout;
import ohos.agp.components.Image;
public class MainAbilitySlice extends AbilitySlice implements Component.DoubleClickedListener {
Image image;
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setUIContent(ResourceTable.Layout_ability_main);
//使用findComponentById的方法找到img的id
image = (Image)findComponentById(ResourceTable.Id_img);
DirectionalLayout directionalLayout = (DirectionalLayout)findComponentById(ResourceTable.Id_ld) ;
directionalLayout.setDoubleClickedListener(this);
}
@Override
public void onActive() {
super.onActive();
}
@Override
public void onForeground(Intent intent) {
super.onForeground(intent);
}
//设置flag标记
boolean flag = false;
@Override
public void onDoubleClick(Component component) {
//使用的image方法
if(flag) {
image.setImageAndDecodeBounds(ResourceTable.Media_xin_off);
flag = false;
}else{
image.setImageAndDecodeBounds(ResourceTable.Media_xin);
flag = true;
}
}
}
双击实现点赞
双击取消点赞