如何绘制的ImageView Android上线？ [英] How to draw a Line in ImageView on Android?

问题描述

我想知道如何绘制线路上的ImageView为用户刷卡自己的手指？

I'd Like to know how to draw a Line on ImageView as user swipe their finger ?

难道任何机构解释一下吗？或许任何一个环节得到开始进行这项工作。

Could any body explain this ? Or perhaps any Link to get start on this.

推荐答案

您必须拥有自己的ImageView并覆盖OnDraw函数。使用这样的事情

You must have your own ImageView and override onDraw function. Use something like this

public class MyImageView extends ImageView{

    public MyImageView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
        canvas.drawLine(0, 0, 20, 20, p);

    }

}

和在主类中创建对象 MyImageView ;当你触摸显示器调用更新（）; 功能

and in your main class create object MyImageView; and when you touch your display call the update(); function

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