Android的绘图按钮，自定义视图以帆布？ [英] Android drawing button to canvas with custom view?
问题描述
我怎么能借鉴自定义视图画布顶部的按钮？ （preferably上的中部右侧）有什么事我都做button.draw（画布）之前调用？
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
您不能插入一个按钮到画布上。 Canvas是位图或视图的位图缓存的接口。你可以只画等位图或像素它，而不是插入的对象或部件。
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：
-
作为尼古拉建议，使用的FrameLayout 并创建两个层（视图），第一您的自定义视图和第二LinerView或RelativeView，这会在顶部，在那里你可以有按钮等等
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
在画布上绘制一个buttun的图像，然后使用 onTouchEvent 在自定义视图和测试用于触摸的坐标，然后做一些事情......为onTouchEvent这里一个例子：<一个href=\"http://stackoverflow.com/questions/5368774/make-certain-area-of-bitmap-transparent-on-touch/5439357#5439357\">Make位图触摸透明的特定区域
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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