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最近想实现Android左滑弹出菜单框,右滑消失菜单这个个功能。了解了一下Android 的滑动事件,必须是在view组件或者Activity上实现,同时必须实现OnTouchListener, OnGestureListener这个两个接口。
public class MyRelativeLayout extends RelativeLayout implements GestureDetector.OnGestureListener{
private float mPosX, mPosY, mCurPosX, mCurPosY;
private static final int FLING_MIN_DISTANCE = 20;// 移动最小距离
private static final int FLING_MIN_VELOCITY = 200;// 移动最大速度
//构建手势探测器
GestureDetector mygesture = new GestureDetector(this);
public MyRelativeLayout(Context context){
super(context)
}
public MyRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
public MyRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
@Override
public boolean onTouchEvent(MotionEvent arg0) {
// TODO Auto-generated method stub
return mDetector.onTouchEvent(arg0);
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onShowPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
// e1:第1个ACTION_DOWN MotionEvent
// e2:最后一个ACTION_MOVE MotionEvent
// velocityX:X轴上的移动速度(像素/秒)
// velocityY:Y轴上的移动速度(像素/秒)
// X轴的坐标位移大于FLING_MIN_DISTANCE,且移动速度大于FLING_MIN_VELOCITY个像素/秒
//向左
if (e1.getY() - e2.getY() > FLING_MIN_DISTANCE){
// && Math.abs(velocityX) > FLING_MIN_VELOCITY) {
collapse();
}
//向上
if (e2.getY() - e1.getY() > FLING_MIN_DISTANCE
&& Math.abs(velocityX) > FLING_MIN_VELOCITY) {
}
return false;
}
}
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