TabLayout设置指示器的宽度

TabLayout的指示器的高度、颜色都可以设置，但是宽度需要自己来实现

在TabLayout view初始化后，设置

/**
 * @date:2017/11/9/009
 * @author:平sir
 * @desc:  设置tablayout的指示器的宽度
 */
private void initView() {mTabLayout.post(new Runnable() {@Override
        public void run() {setIndicator(mTabLayout, 40, 40);
        }});
}

/**
 * @date:2017/11/10/010
 * @author:平sir
 * @desc:  设置tab指示器的宽度
 */
public 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();
    }
}

这样我们就能设置指示器的宽度了