Activity添加扩展

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/**
 * The `fragment` is added to the container view with id `frameId`. The operation is
 * performed by the `fragmentManager`.
 */
fun AppCompatActivity.replaceFragmentInActivity(fragment: Fragment, frameId: Int) {
    supportFragmentManager.transact {
        replace(frameId, fragment)
    }
}

/**
 * The `fragment` is added to the container view with tag. The operation is
 * performed by the `fragmentManager`.
 */
fun AppCompatActivity.addFragmentToActivity(fragment: Fragment, tag: String?=null) {
    supportFragmentManager.transact {
        add(fragment, tag)
    }
}

fun AppCompatActivity.addFragmentToActivity(@IdRes containerViewId: Int, fragment: Fragment){
    supportFragmentManager.transact {
        add(containerViewId, fragment)
    }
}

fun AppCompatActivity.setupActionBar(@IdRes toolbarId: Int, action: ActionBar.() -> Unit) {
    setSupportActionBar(findViewById(toolbarId))
    supportActionBar?.run {
        action()
    }
}

fun <T : ViewDataBinding> AppCompatActivity.bindingContentView(@LayoutRes layoutId: Int): T {
    return DataBindingUtil.setContentView(this, layoutId)
}


fun <T : ViewModel> AppCompatActivity.obtainViewModel(viewModelClass: Class<T>) =
        ViewModelProviders.of(this).get(viewModelClass)
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  override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        bindingContentView(R.layout.activity_main)
    }
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