Android仿京东实现可滑动悬浮按钮,页面滑动可显示和隐藏功能
龙旋
共 5249字,需浏览 11分钟
·
2021-09-12 12:27
前言:
1.悬浮按钮可以上下拖动
2.页面滑动的时候,悬浮按钮移动到最右侧隐藏起来,页面停止滑动的时候显示出来
3.悬浮按钮点击跳转到指定的分享页面
分析实现:
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
int touchSlop = 2;
switch (action) {
case MotionEvent.ACTION_DOWN:
isOnclick = true;
startX = event.getRawX();
startY = event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
float x = event.getRawX();
float Y = event.getRawY();
// 偏移量
int offsetX = (int) (x - startX);
int offsetY = (int) (Y - startY);
if (Math.abs(offsetY) > touchSlop) {
isOnclick = false;
}
// 增量更新
int margin = getTop() + offsetY;
if (margin > top && margin < (screenHeight - bottom)) {
//layout(getLeft(), getTop()+offsetY, getRight(),getBottom() + offsetY);
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) getLayoutParams();
//layoutParams.leftMargin = getLeft() + offsetX;
layoutParams.topMargin = margin;
setLayoutParams(layoutParams);
}
// 更新起始点
startX = x;
startY = Y;
break;
case MotionEvent.ACTION_UP:
if (isOnclick){
performClick();
}
break;
}
return true;
}
当前屏幕停止滚动,屏幕在滚动 且 用户仍在触碰或手指还在屏幕上,随用户的操作屏幕上产生的惯性滑动。两种滑动事件触发的时候都要进行监听 做隐藏处理,屏幕停止滚动时候显示出来
private class MyScrollListener extends RecyclerView.OnScrollListener {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
switch (newState) {
//0:当前屏幕停止滚动;1时:屏幕在滚动 且 用户仍在触碰或手指还在屏幕上;2时:随用户的操作,屏幕上产生的惯性滑动;
case RecyclerView.SCROLL_STATE_IDLE:
isRecycleViewScroll = false;
showShareImage();
break;
case RecyclerView.SCROLL_STATE_DRAGGING:
if (!isRecycleViewScroll && !isBottom && !isTop) {
isRecycleViewScroll = true;
hideShareImage();
}
break;
case RecyclerView.SCROLL_STATE_SETTLING:
if (!isRecycleViewScroll && !isBottom && !isTop) {
isRecycleViewScroll = true;
hideShareImage();
}
break;
}
}
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
boolean bottom = recyclerView.canScrollVertically(1);
boolean top = recyclerView.canScrollVertically(-1);
if (!bottom) {
isBottom = true;
} else {
isBottom = false;
}
if (!top) {
isTop = true;
} else {
isTop = false;
}
}
}
此过程中,滑动到顶部和底部再继续滑动还是会触发滑动事件 所以要做一个判断。
recyclerView.canScrollVertically(1);
返回false的时候 判定滑动到了底部
recyclerView.canScrollVertically(-1);
返回false的时候 判定滑动到了顶部
private void showShareImage() {
float translationX = shareImageView.getTranslationX();
ObjectAnimator animator = ObjectAnimator.ofFloat(shareImageView, "translationX", 0);
animator.setDuration(600);
if (!isAnimatorEnd) {
animator.setStartDelay(1200);
}
animator.start();
}
private void hideShareImage() {
isAnimatorEnd = false;
float translationX = shareImageView.getTranslationX();
ObjectAnimator animator = ObjectAnimator.ofFloat(shareImageView, "translationX", shareImageView.dp2px(getActivity(),70));
animator.setDuration(600);
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
isAnimatorEnd = true;
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
animator.start();
}
注意动画未结束时 延时执行显示动画
源码地址:
https://github.com/l845590743/ShareButton
到这里就结束了。
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