需要获取按下时候的坐标和松开时候的坐标，并将两者进行比较。
①MainAbilitySlice.java文件
可以根据使用情况做修改代码中判断处的限制偏差范围。
package com.example.yeman.slice; import com.example.yeman.ResourceTable; import ohos.aafwk.ability.AbilitySlice; import ohos.aafwk.content.Intent; import ohos.agp.components.Button; import ohos.agp.components.Component; import ohos.agp.components.DirectionalLayout; import ohos.agp.components.Text; import ohos.media.image.common.Position; import ohos.multimodalinput.event.MmiPoint; import ohos.multimodalinput.event.TouchEvent; public class MainAbilitySlice extends AbilitySlice implements Component.TouchEventListener{ float starX; float starY; float endX; float endY; Text txt; @Override public void onStart(Intent intent) { super.onStart(intent); super.setUIContent(ResourceTable.Layout_ability_main); //通过id找到布局对象（其也可以理解是一种组件） DirectionalLayout dl = (DirectionalLayout) findComponentById(ResourceTable.Id_dl); //通过id找到文本框组件 txt = (Text) findComponentById(ResourceTable.Id_txt); //给整个布局添加滑动事件，当在整个布局上滑动时，就会不断调用本类中onTouchEvent方法 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表示滑动的哪个组件，布局也是一种组件，实际上这里示例就是在整个布局上进行的。 //touchEvent表示动作对象（按下，滑动，抬起）。 //获取当前手指对于屏幕进行的操作（按下，滑动，抬起） int action = touchEvent.getAction(); //1表示按下，2表示抬起，3表示滑动（移动） if (action == TouchEvent.PRIMARY_POINT_DOWN){ MmiPoint position = touchEvent.getPointerPosition(0); starX = position.getX(); starY = position.getY(); txt.setText(starX + "--" + starY); }else if (action == TouchEvent.PRIMARY_POINT_UP){ MmiPoint position = touchEvent.getPointerPosition(0); endX = position.getX(); endY = position.getY(); txt.setText(endX + "--" + endY); //Math.abs(starY - endY) < 100是做一个Y方向的限定范围，下面类似。 if (starX > endX && Math.abs(starY - endY) < 100){ txt.setText("左滑了"); }else if (starX < endX && Math.abs(starY - endY) < 100){ txt.setText("右滑了"); }else if (starY > endY && Math.abs(starX - endX) < 100){ txt.setText("上滑了"); }else if (starY < endY && Math.abs(starX - endX) < 100){ txt.setText("下滑了"); }else txt.setText("无效滑动（请直一点！）"); }else if (action == TouchEvent.POINT_MOVE){ txt.setText("滑动中..."); } return true; } }
②ability _main.xml文件
<?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:txt" ohos:height="match_content" ohos:width="match_content" ohos:text="这里是文本框" ohos:text_size="100"/> </DirectionalLayout>
