Harmony OS 滑动事件开发-JAVA

发布于 2021-10-28 17:12
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1.在ability_main.xml

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    ohos:id="$+id:dl"
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">

    <Text
        ohos:id="$+id:tx"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:text="滑动事件"
        ohos:text_size="25vp"
        ohos:text_color="green"
        />


</DirectionalLayout>

2.MainAbilitySlice

public class MainAbilitySlice extends AbilitySlice implements Component.TouchEventListener {
    Text  text;
    int count = 0;//定义一个成员变量,验证touchEvent方法的调用
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);
        //1.获取布局对象和文本
        DirectionalLayout dl =(DirectionalLayout)findComponentById(ResourceTable.Id_dl);
        text  = (Text)findComponentById(ResourceTable.Id_tx);
        //2.给整个布局添加滑动事件
        dl.setTouchEventListener(this);
    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }


    @Override
    public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
        //component 是表示滑动的那个组件
        //实际代表的就是 DirectionalLayout的对象
        //touchEvent代表(上划,下滑,抬起)
        count++;//count成员变量每次加以,加以验证touchEvent方法的调用
        int action = touchEvent.getAction();
        //1.CTRL+B 查看touchEvent里封装的方法
        //public static final int POINT_MOVE = 3;//3是移动
        //public static final int PRIMARY_POINT_DOWN = 1;//1是按下
        //public static final int PRIMARY_POINT_UP = 2;//2是松开

        if (action==TouchEvent.PRIMARY_POINT_DOWN){
            text.setText("按下" +count);
//            MmiPoint pointerPosition = touchEvent.getPointerPosition(0);
//            float x= pointerPosition.getX();
//            float y =pointerPosition.getY();
//            text.setText(x +"----"+y);

        }else if (action==TouchEvent.POINT_MOVE){
            text.setText("移动" +count);
//            MmiPoint pointerPosition = touchEvent.getPointerPosition(0);
//            float x= pointerPosition.getX();
//            float y =pointerPosition.getY();
//            text.setText(x +"----"+y);

        }else if (action==TouchEvent.PRIMARY_POINT_UP){
            text.setText("抬起" +count);
//            MmiPoint pointerPosition = touchEvent.getPointerPosition(0);
//            float x= pointerPosition.getX();
//            float y =pointerPosition.getY();
//            text.setText(x +"----"+y);

        }

        return true;

    }
}

效果图:
Harmony OS 滑动事件开发-JAVA-开源基础软件社区

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