TabLayout指示器的长短反射修改

来源：互联网发布：linux 精确时间编辑：程序博客网时间：2024/05/11 15:05
取出所有tab其中最长的文本设置指示器宽度的长短

    /** 设置tablayout指示器的长短     *     * @param tab     */    public static void showTabTextAdapteIndicator(final TabLayout tab) {        tab.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {            @Override            public void onGlobalLayout() {                tab.getViewTreeObserver().removeOnGlobalLayoutListener(this);                Class<?> tabLayout = tab.getClass();                Field tabStrip = null;                try {                    tabStrip = tabLayout.getDeclaredField("mTabStrip");                } catch (NoSuchFieldException e) {                    e.printStackTrace();                }                tabStrip.setAccessible(true);                LinearLayout ll_tab = null;                try {                    ll_tab = (LinearLayout) tabStrip.get(tab);                } catch (IllegalAccessException e) {                    e.printStackTrace();                }                int maxLen = 0;                int maxTextSize = 0;                int tabCount = ll_tab.getChildCount();                for (int i = 0; i < tabCount; i++) {                    View child = ll_tab.getChildAt(i);                    child.setPadding(0, 0, 0, 0);                    if (child instanceof ViewGroup) {                        ViewGroup viewGroup = (ViewGroup) child;                        for (int j = 0; j < ll_tab.getChildCount(); j++) {                            if (viewGroup.getChildAt(j) instanceof TextView) {                                TextView tabTextView = (TextView) viewGroup.getChildAt(j);                                int length = tabTextView.getText().length();                                maxTextSize = (int) tabTextView.getTextSize() > maxTextSize ? (int) tabTextView.getTextSize() : maxTextSize;                                maxLen = length > maxLen ? length : maxLen;                            }                        }                    }                    int margin = (tab.getWidth() / tabCount - (maxTextSize + UiUtils.dp2px(2)) * maxLen) / 2 - UiUtils.dp2px(2);                    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);                    params.leftMargin = margin;                    params.rightMargin = margin;                    child.setLayoutParams(params);                    child.invalidate();                }            }        });    }
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