您如何在Android的TabLayout中制作动画？

我已经用viewPager实现了四个选项卡的TabLayout.
这些选项卡具有customView,因为每个选项卡都有两个textView(文本看不见的计数).
因此,在更改选项卡时,我能够处理很多UI内容,但是,无法为看不见的textView设置动画.

我的自定义XML对于textView及其父级RelativeLayout均具有android：animateLayoutChanges =“ true”.

另外,我尝试在实际标签上设置此功能,尝试制作各种动画,但均无效.
ps-没有动画,我只是设置能见度(消失,可见).

private void updateUnseenOnTab(int position, int unseen) {
    ViewGroup vg = (ViewGroup) mTabLayout.getChildAt(0);

    ViewGroup vgTab = (ViewGroup) vg.getChildAt(position);
    View view = vgTab.getChildAt(0);

    if (view != null && view.findViewById(R.id.tab_unseen) instanceof TextView) {
        final TextView unseenText = (TextView) view.findViewById(R.id.tab_unseen);
        if (unseen <= 0) {
            unseenText.setText("0");
            Animation fadeOut = new AlphaAnimation(0, 1);
            fadeOut.setDuration(1000);
            unseenText.setAnimation(fadeOut);
        } else {
            String currentText = unseenText.getText().toString();
            try {
                Animation fadeIn = new AlphaAnimation(0, 1);
                fadeIn.setDuration(1000);
                unseenText.setAnimation(fadeIn);
                unseenText.setText("" + ((TextUtils.isEmpty(currentText) ? 0 : unseen) + Integer.valueOf(currentText)));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

解决方法:

我不知道您是否要为每个选项卡或每个选项卡中的子视图设置动画.这将以150ms的延迟使每个选项卡一个接一个地动画.如果要为一个选项卡中的每个孩子设置动画,只需将其置于另一个循环中即可.

            tabs = (TabLayout) findViewById(R.id.tabs);
            ViewGroup vg = (ViewGroup) tabs.getChildAt(0);
            int tabsCount = vg.getChildCount();
            for (int i = 0; i < tabsCount; i++)
            {
                int delay = (i * 150) + 750; //this is starting delay
                ViewGroup vgTab = (ViewGroup) vg.getChildAt(i);
                vgTab.setScaleX(0f);
                vgTab.setScaleY(0f);

                vgTab.animate()
                        .scaleX(1f)
                        .scaleY(1f)
                        .setStartDelay(delay)
                        .setInterpolator(new FastOutSlowInInterpolator())
                        .setDuration(450)
                        .start();
            }

标签：android-tablayout,android-animation,android
来源： https://codeday.me/bug/20191120/2040517.html