android - 允许矩形可点击 - android

Question

我用canvas写了一个View，里面有很多矩形。我希望将这些矩形用作将打开新 Activity 的按钮。我该怎么做？

Answer 1

您需要注意 Suri Sahani 示例，onTouchEvent 会在任何符合触摸事件条件的操作上调用，这意味着按下、释放、移动手势等 (Android Event Listener Documentation)。要正确使用 onTouchEvent，您需要检查 MotionEvent 类型。

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;
}