Android 绘图按钮到带有自定义视图的画布? [英] Android drawing button to canvas with custom view?

问题描述

如何在自定义视图中在画布顶部绘制按钮?(最好在中间右侧)在执行 button.draw(canvas) 之前有什么我必须调用的吗?

How can I draw a button on top of the canvas in a custom view? (Preferably on the mid-right side) Is there something I have to call before doing the button.draw(canvas)?

    public class MyClass extends View {
    public Simulation(Context context) {
            super(context);
            pauseButton.setText("TestButton");
            pauseButton.setClickable(true);
            pauseButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
            Log.i(TAG, "Button Pressed!");
            }
            });
    public onDraw(Canvas canvas) {
           super.onDraw(canvas);
           pauseButton.draw(canvas);
    }
    }

感谢您的时间

推荐答案

不能将按钮插入画布.Canvas 是位图的接口或视图的位图缓冲区.您只能在其中绘制其他位图或像素，不能插入对象或小部件.

You cannot insert a button into canvas. Canvas is an interface for bitmap or a bitmap buffer for a view. You can only draw other bitmap or pixels in it, not insert an object or a widget.

有一些解决方案:

1. 按照 Nikolay 的建议，使用 FrameLayout 并创建两个图层(视图)，第一个是您的自定义视图，第二个是 LinerView 或 RelativeView，它们将位于顶部，您可以在其中放置按钮等

1. as Nikolay suggested, use a FrameLayout and create two layers (views), first your custom view and the second LinerView or RelativeView, which will come on top, where you can have buttons etc

在 Canvas 上绘制一个按钮的图像，然后在您的自定义视图中使用 onTouchEvent 并测试触摸的坐标，然后做一些事情......这里是 onTouchEvent 的示例:使位图的某些区域在触摸时透明

draw an image of a buttun on Canvas then use onTouchEvent in your custom view and test for the coordinates of the touch, then do something... an example for onTouchEvent here: Make certain area of bitmap transparent on touch

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