设置tablayout下划线的宽度

package com.kjt.app.activity.myaccount.MyNewStoreTemplate;

import android.content.res.Resources;
import android.support.design.widget.TabLayout;
import android.util.TypedValue;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.lang.reflect.Field;

/**
* Created by xiayujia on 2017/6/20.
*/

public class TabLayoutIndicator {

/**
* 修改tablayout宽度
* @param tabs
* @param leftDip
* @param rightDip
*/
public static void setIndicator(TabLayout tabs, int leftDip, int rightDip) {
Class<?> tabLayout = tabs.getClass();
Field tabStrip = null;
try {
tabStrip = tabLayout.getDeclaredField("mTabStrip");
} catch (NoSuchFieldException e) {
e.printStackTrace();
}

tabStrip.setAccessible(true);
LinearLayout llTab = null;
try {
llTab = (LinearLayout) tabStrip.get(tabs);
} catch (IllegalAccessException e) {
e.printStackTrace();
}

int left = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, leftDip, Resources.getSystem().getDisplayMetrics());
int right = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, rightDip, Resources.getSystem().getDisplayMetrics());
for (int i = 0; i < llTab.getChildCount(); i++) {
View child = llTab.getChildAt(i);
child.setPadding(0, 0, 0, 0);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
params.leftMargin = left;
params.rightMargin = right;
child.setLayoutParams(params);
child.invalidate();
}
}

public static void setIndicator(TabLayout tabLayout) {
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 = SM.dip2px(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 = 57;
params.rightMargin = 57;
tabView.setLayoutParams(params);

tabView.invalidate();
}

} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}