如何在Android中使手势描述可访问性连续向下滑动手势滚动

编程问答 2022-08-13

问题描述

我正在尝试使用具有辅助功能的手势描述来连续向下滚动。这是我的向下滑动代码

        val displayMetrics = resources.displayMetrics
        val height : Int = displayMetrics.heightPixels;
        val top : Float = height*0.25.toFloat()
        val bottom :Float = height *0.75.toFloat()
        
        val swipePath = Path()
        swipePath.moveto(top,bottom)
        swipePath.lineto(top,top)
        val gestureBuilder = GestureDescription.Builder()
        gestureBuilder.addstroke(GestureDescription.strokeDescription(swipePath,1000))
        dispatchGesture(gestureBuilder.build(),null,null)

请帮助。

解决方法

path.moveTo()和path.lineTo()都接受两个参数，分别是x和y坐标，并且要垂直滑动起点和终点的x坐标应该相同。您从高度而不是宽度获取x坐标，这可能还会产生其他问题，例如屏幕外的点。所以我修改了一点代码

val displayMetrics = resources.displayMetrics
val height : Int = displayMetrics.heightPixels
val xCenter: Float = displayMetrics.widthPixels.toFloat()/2
val top : Float = height*0.25.toFloat()
val bottom :Float = height *0.75.toFloat()

val swipePath = Path()
swipePath.moveTo(xCenter,bottom)
swipePath.lineTo(xCenter,top)
val gestureBuilder = GestureDescription.Builder()
gestureBuilder.addStroke(GestureDescription.StrokeDescription(swipePath,1000))
dispatchGesture(gestureBuilder.build(),null,null)
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