我在安卓应用中有两个可拖动的视图,想要检测它们之间是否发生碰撞。目前我正在使用以下代码进行碰撞检测,但我认为它不起作用。请建议如何检测碰撞。
public boolean onTouch(View view, MotionEvent event) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view
.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_POINTER_DOWN:
break;
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams ParamsA = (RelativeLayout.LayoutParams) view
.getLayoutParams();
ParamsA.leftMargin = X - _xDelta;
ParamsA.topMargin = Y - _yDelta;
ParamsA.rightMargin = -250;
ParamsA.bottomMargin = -250;
for (int i = 0; i < balls.size(); i++) {
if (balls.get(i).getTag() != view.getTag()) {
RelativeLayout.LayoutParams ParamsB = (RelativeLayout.LayoutParams) balls
.get(i).getLayoutParams();
Rect b = new Rect(ParamsB.leftMargin,ParamsB.topMargin,ParamsB.rightMargin,ParamsB.bottomMargin);
Rect a = new Rect(ParamsA.leftMargin,ParamsA.topMargin,ParamsA.rightMargin,ParamsA.bottomMargin);
if(a.intersect(b))
{
Toast.makeText(getApplicationContext(), "Collision Detected", Toast.LENGTH_SHORT).show();
}
}
}
view.setLayoutParams(ParamsA);
break;
}
// _root.invalidate();
return true;
}
“balls”是屏幕上摆放的“View”类型的数组。