tablayout下划线长度

安卓8.0版本Google已经修改这个bug，添加：app:tabIndicatorFullWidth="false" 即可

安卓8.0以下的版本：

public class TabReflexUtil {public static void reflex(final SmartTabLayout tabLayout){//了解源码得知 线的宽度是根据 tabView的宽度来设置的tabLayout.post(new Runnable() {@Overridepublic void run() {try {//拿到tabLayout的mTabStrip属性Field mTabStripField = tabLayout.getClass().getDeclaredField("mTabStrip");mTabStripField.setAccessible(true);LinearLayout mTabStrip = (LinearLayout) mTabStripField.get(tabLayout);int dp10 = dip2px(tabLayout.getContext(), 10);for (int i = 0; i < mTabStrip.getChildCount(); i++) {View tabView = mTabStrip.getChildAt(i);//拿到tabView的mTextView属性Field mTextViewField = tabView.getClass().getDeclaredField("mTextView");mTextViewField.setAccessible(true);TextView mTextView = (TextView) mTextViewField.get(tabView);tabView.setPadding(0, 0, 0, 0);//因为我想要的效果是   字多宽线就多宽，所以测量mTextView的宽度int width = 0;width = mTextView.getWidth();if (width == 0) {mTextView.measure(0, 0);width = mTextView.getMeasuredWidth();}//设置tab左右间距为10dp  注意这里不能使用Padding 因为源码中线的宽度是根据 tabView的宽度来设置的LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) tabView.getLayoutParams();params.width = width ;params.leftMargin = dp10;params.rightMargin = dp10;tabView.setLayoutParams(params);tabView.invalidate();}} catch (NoSuchFieldException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}});}public static void reflex(final TabLayout tabLayout){//了解源码得知 线的宽度是根据 tabView的宽度来设置的tabLayout.post(new Runnable() {@Overridepublic void run() {try {//拿到tabLayout的mTabStrip属性Field mTabStripField = tabLayout.getClass().getDeclaredField("mTabStrip");mTabStripField.setAccessible(true);LinearLayout mTabStrip = (LinearLayout) mTabStripField.get(tabLayout);int dp10 = dip2px(tabLayout.getContext(), 10);for (int i = 0; i < mTabStrip.getChildCount(); i++) {View tabView = mTabStrip.getChildAt(i);//拿到tabView的mTextView属性Field mTextViewField = tabView.getClass().getDeclaredField("mTextView");mTextViewField.setAccessible(true);TextView mTextView = (TextView) mTextViewField.get(tabView);tabView.setPadding(0, 0, 0, 0);//因为我想要的效果是   字多宽线就多宽，所以测量mTextView的宽度int width = 0;width = mTextView.getWidth();if (width == 0) {mTextView.measure(0, 0);width = mTextView.getMeasuredWidth();}//设置tab左右间距为10dp  注意这里不能使用Padding 因为源码中线的宽度是根据 tabView的宽度来设置的LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) tabView.getLayoutParams();params.width = width ;params.leftMargin = dp10;params.rightMargin = dp10;tabView.setLayoutParams(params);tabView.invalidate();}} catch (NoSuchFieldException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}});}public static int dip2px(Context context, float dipValue) {final float scale = context.getResources().getDisplayMetrics().density;return (int) (dipValue * scale + 0.5f);}/*** 通过反射{@link TabLayout}设置下划线(Indicator)宽度，字多宽线就多宽，参阅 https://blog.csdn.net/waplyj/article/details/81068127*/public static void setTabLayoutIndicator(final TabLayout tabLayout) {//了解源码得知 线的宽度是根据 tabView的宽度来设置的tabLayout.post(new Runnable() {@Overridepublic void run() {try {Field field = tabLayout.getClass().getDeclaredField("mTabStrip");field.setAccessible(true);//拿到tabLayout的mTabStrip属性LinearLayout tabStrip = (LinearLayout) field.get(tabLayout);for (int i = 0, count = tabStrip.getChildCount(); i < count; i++) {View tabView = tabStrip.getChildAt(i);//拿到tabView的mTextView属性  tab的字数不固定一定用反射取mTextViewField mTextViewField = tabView.getClass().getDeclaredField("mTextView");mTextViewField.setAccessible(true);TextView textView = (TextView) mTextViewField.get(tabView);tabView.setPadding(0, 0, 0, 0);//因为我想要的效果是   字多宽线就多宽，所以测量mTextView的宽度int textWidth = 0;textWidth = textView.getWidth();if (textWidth == 0) {textView.measure(0, 0);textWidth = textView.getMeasuredWidth();}int tabWidth = 0;tabWidth = tabView.getWidth();if (tabWidth == 0) {tabView.measure(0, 0);tabWidth = tabView.getMeasuredWidth();}LinearLayout.LayoutParams tabViewParams = (LinearLayout.LayoutParams) tabView.getLayoutParams();int margin = (tabWidth - textWidth) / 2;//LogUtils.d("textWidth=" + textWidth + ", tabWidth=" + tabWidth + ", margin=" + margin);tabViewParams.leftMargin = margin;tabViewParams.rightMargin = margin;tabView.setLayoutParams(tabViewParams);}} catch (NoSuchFieldException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}});}public static void setTabLayoutIndicator(final SmartTabLayout tabLayout) {//了解源码得知 线的宽度是根据 tabView的宽度来设置的tabLayout.post(new Runnable() {@Overridepublic void run() {try {Field field = tabLayout.getClass().getDeclaredField("mTabStrip");field.setAccessible(true);//拿到tabLayout的mTabStrip属性LinearLayout tabStrip = (LinearLayout) field.get(tabLayout);for (int i = 0, count = tabStrip.getChildCount(); i < count; i++) {View tabView = tabStrip.getChildAt(i);//拿到tabView的mTextView属性  tab的字数不固定一定用反射取mTextViewField mTextViewField = tabView.getClass().getDeclaredField("mTextView");mTextViewField.setAccessible(true);TextView textView = (TextView) mTextViewField.get(tabView);tabView.setPadding(0, 0, 0, 0);//因为我想要的效果是   字多宽线就多宽，所以测量mTextView的宽度int textWidth = 0;textWidth = textView.getWidth();if (textWidth == 0) {textView.measure(0, 0);textWidth = textView.getMeasuredWidth();}int tabWidth = 0;tabWidth = tabView.getWidth();if (tabWidth == 0) {tabView.measure(0, 0);tabWidth = tabView.getMeasuredWidth();}LinearLayout.LayoutParams tabViewParams = (LinearLayout.LayoutParams) tabView.getLayoutParams();int margin = (tabWidth - textWidth) / 2;//LogUtils.d("textWidth=" + textWidth + ", tabWidth=" + tabWidth + ", margin=" + margin);tabViewParams.leftMargin = margin;tabViewParams.rightMargin = margin;tabView.setLayoutParams(tabViewParams);}} catch (NoSuchFieldException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}}});}/*** 设置{@link TabLayout}的每项之间的分隔线*/public static void setTabLayoutDivider(TabLayout tabLayout) {setTabLayoutDivider(tabLayout, 12);}/*** 设置{@link TabLayout}的每项之间的分隔线*/public static void setTabLayoutDivider(TabLayout tabLayout, int paddingDip) {LinearLayout mTabStrip = (LinearLayout) tabLayout.getChildAt(0);mTabStrip.setShowDividers(LinearLayout.SHOW_DIVIDER_MIDDLE);mTabStrip.setDividerPadding(dip2px(tabLayout.getContext(),paddingDip));
//        mTabStrip.setDividerDrawable(UIUtils.getDrawable(R.drawable.bg_big));}}

TabReflexUtil.reflex(tabLayout);即可

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