【www.bbyears.com--php常用代码】
代码如下
publicclassMyScrollViewextendsScrollView {
privateView childView;
publicMyScrollView(Context context) {
super(context);
}
publicMyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
publicMyScrollView(Context context, AttributeSet attrs,intdefStyleAttr) {
super(context, attrs, defStyleAttr);
}
// @Override
// protected void onLayout(boolean changed, int l, int t, int r, int b) {
// super.onLayout(changed, l, t, r, b);
// }
//获取子视图
@Override
protectedvoidonFinishInflate() {
super.onFinishInflate();
if(getChildCount() >0) {
childView = getChildAt(0);
}
}
privateintlastY;//上一次y轴方向操作的坐标位置
privateRect normal =newRect();//用于记录临界状态的左、上、右、下
privatebooleanisFinishAnimation =true;//是否动画结束
privateintlastX, downX, downY;
//拦截:实现父视图对子视图的拦截
//是否拦截成功，取决于方法的返回值。返回值true:拦截成功。反之，拦截失败
@Override
publicbooleanonInterceptTouchEvent(MotionEvent ev) {
booleanisIntercept =false;
inteventX = (int) ev.getX();
inteventY = (int) ev.getY();
switch(ev.getAction()) {
caseMotionEvent.ACTION_DOWN:
lastX = downX = eventX;
lastY = downY = eventY;
break;
caseMotionEvent.ACTION_MOVE:
//获取水平和垂直方向的移动距离
intabsX = Math.abs(eventX - downX);
intabsY = Math.abs(eventY - downY);
if(absY > absX && absY >= UIUtils.dp2px(10)){
isIntercept =true;//执行拦截
}
lastX = eventX;
lastY = eventY;
break;
}
returnisIntercept;
}
@Override
publicbooleanonTouchEvent(MotionEvent ev) {
if(childView ==null|| !isFinishAnimation) {
returnsuper.onTouchEvent(ev);
}
inteventY = (int) ev.getY();//获取当前的y轴坐标
switch(ev.getAction()) {
caseMotionEvent.ACTION_DOWN:
lastY = eventY;
break;
caseMotionEvent.ACTION_MOVE:
intdy = eventY - lastY;//微小的移动量
if(isNeedMove()) {
if(normal.isEmpty()) {
//记录了childView的临界状态的左、上、右、下
normal.set(childView.getLeft(), childView.getTop(), childView.getRight(), childView.getBottom());
}
//重新布局
childView.layout(childView.getLeft(), childView.getTop() + dy /2, childView.getRight(), childView.getBottom() + dy /2);
}
lastY = eventY;//重新赋值
break;
caseMotionEvent.ACTION_UP:
if(isNeedAnimation()) {
//使用平移动画
inttranslateY = childView.getBottom() - normal.bottom;
TranslateAnimation translateAnimation =newTranslateAnimation(0,0,0, -translateY);
translateAnimation.setDuration(200);
// translateAnimation.setFillAfter(true);//停留在最终位置上
translateAnimation.setAnimationListener(newAnimation.AnimationListener() {
@Override
publicvoidonAnimationStart(Animation animation) {
isFinishAnimation =false;
}
@Override
publicvoidonAnimationEnd(Animation animation) {
isFinishAnimation =true;
childView.clearAnimation();//清除动画
//重新布局
childView.layout(normal.left, normal.top, normal.right, normal.bottom);
//清除normal的数据
normal.setEmpty();
}
@Override
publicvoidonAnimationRepeat(Animation animation) {
}
});
//启动动画
childView.startAnimation(translateAnimation);
}
break;
}
returnsuper.onTouchEvent(ev);
}
//判断是否需要执行平移动画
privatebooleanisNeedAnimation() {
return!normal.isEmpty();
}
privatebooleanisNeedMove() {
intchildMeasuredHeight = childView.getMeasuredHeight();//获取子视图的高度
intscrollViewMeasuredHeight =this.getMeasuredHeight();//获取布局的高度
Log.e("TAG","childMeasuredHeight = "+ childMeasuredHeight);
Log.e("TAG","scrollViewMeasuredHeight = "+ scrollViewMeasuredHeight);
intdy = childMeasuredHeight - scrollViewMeasuredHeight;//dy >= 0
intscrollY =this.getScrollY();//获取用户在y轴方向上的偏移量 （上 + 下 -）
if(scrollY <=0|| scrolly="">= dy) {
returntrue;//按照我们自定义的MyScrollView的方式处理
}
//其他处在临界范围内的，返回false。即表示，仍按照ScrollView的方式处理
returnfalse;
}
}