为了更方便的使用Frgment，使用扩展方法对其进行扩展，来简化其使用方式
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添加扩展函数
inline fun FragmentManager.inTransaction(func: FragmentTransaction.() -> FragmentTransaction) = fun AppCompatActivity.addFragment(fragment: Fragment, frameId: Int) = supportFragmentManager.inTransaction { add(frameId, fragment) } fun AppCompatActivity.replaceFragment(fragment: Fragment, frameId: Int) = supportFragmentManager.inTransaction{replace(frameId, fragment)} -
activity中进行调用
addFragment(mFragment1, R.id.mFlContent) replaceFragment(mFragment2, R.id.mFlContent)