Android实现网易严选标签栏滑动效果

// 根据当前选定的tab，得到indicator应该移动到的位置 private Pair<Float, Float> getIndicatorTargetLeftRight(int position, float positionOffset) {   View tab = tabsContainer.getChildAt(position);   Pair<Float, Float> indicator = getIndicatorLeftRight(tab);   float targetLeft = indicator.first;   float targetRight = indicator.second;   // 如果positionOffset不为0，indicator正处于两个tab之间，需进行加权计算得到它的位置   if (positionOffset > 0f && position < tabCount - 1) {     View nextTab = tabsContainer.getChildAt(position + 1);     Pair<Float, Float> indicatorForNextTab = getIndicatorLeftRight(nextTab);     float left = indicatorForNextTab.first;     float right = indicatorForNextTab.second;     targetLeft = (positionOffset * left + (1f - positionOffset) * targetLeft);     targetRight = (positionOffset * right + (1f - positionOffset) * targetRight);   }   return new Pair<>(targetLeft, targetRight); }  private Pair<Float, Float> getIndicatorLeftRight(View tab) {   float left = tab.getLeft();   float right = tab.getRight();   if (indicatorMode == IndicatorMode.WRAP && tab instanceof TextView) {     TextView tabTextView = (TextView) tab;     paint.setTextSize(tabTextView.getTextSize());     float textLength = paint.measureText(tabTextView.getText().toString());     float middle = (left + right) / 2f;     left = middle - textLength / 2f;     right = middle + textLength / 2f;   }   return new Pair<>(left, right); }