我希望能够在屏幕上的任何位置滑动以调用某个功能.但我也想要能够点击的线性布局中的按钮.如果我在按钮上滑动我想onInterceptTouchEvent拦截对Button的onTouchEvent的调用并执行滑动操作.如果我只是单击一个按钮,我不希望调用onInterceptTouchEvent.相反,我希望调用Button的onTouchEvent并执行Button单击
但是当我尝试实现onInterceptTouchEvent时,我遇到了错误.
这是我的代码：
public class Game extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.game_activity);
//other code....
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
swipeScreen(); //if action recognized as swipe then swipe
break;
case MotionEvent.ACTION_MOVE:
float x = event.getX();
float y = event.getY();
float xDelta = Math.abs(x - mLastX);
float yDelta = Math.abs(y - mLastY);
if (yDelta > xDelta) {
return true;
}
break;
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
ButtonOnClick(); //if not a swipe,then button click
return true;
}
首先错误说明：Game类型的onInterceptTouchEvent(MotionEvent)方法必须覆盖或实现超类型方法
然后,而不是返回true我将代码更改为：return super.onInterceptTouchEvent(event)但后来我得到一个错误说：对于类型Activity,未定义onInterceptTouchEvent(MotionEvent)方法
有人可以帮忙吗？
解决方法
请注意,
onInterceptTouchEvent()是ViewGroup类中的方法,而不是来自Activity.
您可以通过将逻辑从onInterceptTouchEvent()移动到dispatchTouchEvent(MotionEvent ev)来实现所需的行为.请记住调用dispatchTouchEvent(MotionEvent ev)的超类实现来处理应该正常处理的事件.
另请注意,只有在delta大于system constant for touch slop时才应考虑移动.我建议用户通过测试yDelta / 2>确保用户正在按照您想要的方向滑动. xDelta而不是yDelta> xDelta.
public class Game extends Activity {
private int mSlop;
private float mDownX;
private float mDownY;
private boolean mSwiping;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.game_activity);
ViewConfiguration vc = ViewConfiguration.get(this)
mSlop = vc.getScaledTouchSlop();
//other code....
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mDownX = ev.getX();
mDownY = ev.getY();
mSwiping = false;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if(mSwiping) {
swipeScreen(); //if action recognized as swipe then swipe
}
break;
case MotionEvent.ACTION_MOVE:
float x = ev.getX();
float y = ev.getY();
float xDelta = Math.abs(x - mDownX);
float yDelta = Math.abs(y - mDownY);
if (yDelta > mSlop && yDelta / 2 > xDelta) {
mSwiping = true;
return true;
}
break;
}
return super.dispatchTouchEvent(ev);
}
}
