android - 屏幕移动

Question

我想要一个布局(种类无关紧要)，即实际尺寸比屏幕的实际尺寸大乘以 5。我创建了一个 surfesview，它使用 Canvas 绘制我想要的东西，但是如何通过触摸移动屏幕以便能够看到屏幕的每个部分？我怎样才能知道点击了哪个 View (我希望点击时会发生什么)？

Answer 1

在我看来，您可能希望使用 OnTouchListener 或 View.onTouchEvent(MotionEvent ev) 来检测触摸并采取适当的行动:

例如:

myView.setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch(event.getAction()){
            case MotionEvent.ACTION_UP:
                // Perform click operation
                return true;
            case MotionEvent.ACTION_MOVE:
                // Move to another area based on the event
                return true;
        }
        return false;
    }
});

或者在你的类里面:

int downX = -1;
int downY = -1;

public boolean onTouchEvent(MotionEvent event) {

    int eventAction = event.getAction();

    // You may need the x/y location
    int x = (int)event.getX();
    int y = (int)event.getY();

    // put your code in here to handle the event
    switch (eventAction) {
        case MotionEvent.ACTION_DOWN:
            downX = x;
            downY = y;
            break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_CANCEL:
            downX = -1;
            downY = -1;
            // decide what to do here about movement
            break;
        case MotionEvent.ACTION_MOVE:
            int deltaX = x - downX;
            int deltaY = y - downY;
            // This is one way of doing it, it might not be exactly what you want, but you can start from her
            setTranslationX(getTranslationX() + deltaX);
            setTranslationY(getTranslationY() + deltaY);
            break;
    }

    return true;
}