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1.写个工具类 封装：
import android.content.res.Resources;
import android.support.design.widget.TabLayout;
import android.util.TypedValue;
import android.view.View;
import android.widget.LinearLayout;
import java.lang.reflect.Field;
/**
* Created by Sy on 2017/05/08.
*
*/
public class TabUtils {
/**
* @param tabs TabLayout
* @param leftDip marginLeft
* @param rightDip marginRight
*/
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();
return;
}
tabStrip.setAccessible(true);
LinearLayout llTab = null;
try {
llTab = (LinearLayout) tabStrip.get(tabs);
} catch (IllegalAccessException e) {
e.printStackTrace();
return；
}
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();
}
}
}
2.在Activity调用
tab_view.post(new Runnable() {
@Override
public void run() {
TabUtils.setIndicator(tab_view,10,10);
}
}); 3,此方法是通过反射获取tablayout私有属性进修改属性值，如果app启动混淆 会报NoSuchFieldException；
解决方案：在proguard-rules.pro混淆文件中添加-keep class android.support.design.widget.TabLayout{*;} | 
转播
