使矩形可以点击 - 机器人 [英] Allowing rectangle to be clickable - android

问题描述

我写的帆布，其中包含许多矩形视图。我想这些矩形用作一个按钮，将打开一个新的活动。我该怎么办呢？

I wrote a View with canvas, which contains many rectangles. I want these rectangles to be used as a button which will open a new activity. How can I do it?

推荐答案

您需要小心苏瑞Sahani例如，onTouchEvent被称为上作为一个合格的触摸事件的任何行动，这意味着preSS，释放，运动姿态，等（ Android的事件监听器文档）。要正确使用onTouchEvent你需要检查MotionEvent类型。

You need to be careful with Suri Sahani example, onTouchEvent is called on any action qualified as a touch event, meaning press, release, movement gesture, etc(Android Event Listener Documentation). To use the onTouchEvent properly you need to check the MotionEvent type.

List<Rect> retangles;//Assume these have been drawn in your draw method.

@Override
public boolean onTouchEvent(MotionEvent event) {
    int touchX = event.getX();
    int touchY = event.getY();
    switch(event){
        case MotionEvent.ACTION_DOWN:
            System.out.println("Touching down!");
            for(Rect rect : rectangles){
                if(rect.contains(touchX,touchY)){
                    System.out.println("Touched Rectangle, start activity.");
                    Intent i = new Intent(<your activity info>);
                    startActivity(i);
                }
            }
            break;
        case MotionEvent.ACTION_UP:
            System.out.println("Touching up!");
            break;
        case MotionEvent.ACTION_MOVE:
            System.out.println("Sliding your finger around on the screen.");
            break;
    }
    return true;
}

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