change TabLayout Indicator width 修改TabLayout Indicator的宽度

修改TabLayout Indicator的宽度

/**
 * 通过反射修改TabLayout Indicator的宽度（仅在Android 4.2及以上生效）
 */
private void setUpIndicatorWidth(TabLayout tabLayout) {
        Class<?> tabLayoutClass = tabLayout.getClass();
        Field tabStrip = null;
        try {
            tabStrip = tabLayoutClass.getDeclaredField("mTabStrip");
            tabStrip.setAccessible(true);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }

        LinearLayout layout = null;
        try {
            if (tabStrip != null) {
                layout = (LinearLayout) tabStrip.get(tabLayout);
            }
            if (layout != null) {
                for (int i = 0; i < layout.getChildCount(); i++) {
                    View child = layout.getChildAt(i);
                    child.setPadding(0, 0, 0, 0);
                    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                        params.setMarginStart(UnitConvert.dipToPixels(this, 18));
                        params.setMarginEnd(UnitConvert.dipToPixels(this, 18));
                    }
                    child.setLayoutParams(params);
                    child.invalidate();
                }
            }
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }