Android 使用Kotlin的片段中的runOnUiThread（）方法

如何在

fragment

中使用

runOnUiThread

。如何在片段中完成它

下面是在活动中执行此操作的代码

this@MainActivity.runOnUiThread(java.lang.Runnable {
    progressBar.visibility = View.GONE
})

---

如果要在片段内部使用

runOnUiThread（）

internal fragment，则需要使用

Activity

context

示例代码

  class MyFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment

        activity?.runOnUiThread {
            progressBar.visibility = View.GONE
        }
        return inflater.inflate(R.layout.fragment_layout, container, false)
    }


}

class DepositFragment : Fragment() {

    lateinit var rootView: View
    lateinit var mContext: Context

    override fun onAttach(context: Context) {
        super.onAttach(context)
        mContext = context
    }
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        (mContext as Activity).runOnUiThread { 

        }
        return inflater.inflate(R.layout.fragment_deposit, container, false)
    }
}

示例代码

  class MyFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment

        activity?.runOnUiThread {
            progressBar.visibility = View.GONE
        }
        return inflater.inflate(R.layout.fragment_layout, container, false)
    }


}

class DepositFragment : Fragment() {

    lateinit var rootView: View
    lateinit var mContext: Context

    override fun onAttach(context: Context) {
        super.onAttach(context)
        mContext = context
    }
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        (mContext as Activity).runOnUiThread { 

        }
        return inflater.inflate(R.layout.fragment_deposit, container, false)
    }
}

---

如果要在片段内部使用

runOnUiThread（）

internal fragment，则需要使用

Activity

context

示例代码

  class MyFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment

        activity?.runOnUiThread {
            progressBar.visibility = View.GONE
        }
        return inflater.inflate(R.layout.fragment_layout, container, false)
    }


}

class DepositFragment : Fragment() {

    lateinit var rootView: View
    lateinit var mContext: Context

    override fun onAttach(context: Context) {
        super.onAttach(context)
        mContext = context
    }
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        (mContext as Activity).runOnUiThread { 

        }
        return inflater.inflate(R.layout.fragment_deposit, container, false)
    }
}

示例代码

  class MyFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment

        activity?.runOnUiThread {
            progressBar.visibility = View.GONE
        }
        return inflater.inflate(R.layout.fragment_layout, container, false)
    }


}

class DepositFragment : Fragment() {

    lateinit var rootView: View
    lateinit var mContext: Context

    override fun onAttach(context: Context) {
        super.onAttach(context)
        mContext = context
    }
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        (mContext as Activity).runOnUiThread { 

        }
        return inflater.inflate(R.layout.fragment_deposit, container, false)
    }
}

---

runOnUiThread方法可以做两件事

它检查当前线程

如果当前线程是主线程，它会立即执行任务，否则它会将任务提交给活动处理程序

我认为，最好的解决方案应该是：

显式创建新处理程序的步骤

将任务发布到新处理程序

Smth是这样的：

private val handler = Handler(Looper.getMainLooper())
...
handler.post {
...your task...
}

---

RunNuithRead方法有两个功能

它检查当前线程

如果当前线程是主线程，它会立即执行任务，否则它会将任务提交给活动处理程序

我认为，最好的解决方案应该是：

显式创建新处理程序的步骤

将任务发布到新处理程序

Smth是这样的：

private val handler = Handler(Looper.getMainLooper())
...
handler.post {
...your task...
}

---

这个问题对我来说没有任何意义，因为上面已经说过，片段中的所有调用都将始终在主线程或UI线程上运行。无需为此显式调用@rununuithread。当您从工作线程更新视图时，需要将上下文切换到UI以更新视图。

这个问题对我来说没有任何意义，如上所述，片段中的所有调用将始终在主线程或UI线程上运行。无需为此显式调用@rununuithread。当您从工作线程更新视图时，需要将上下文切换到UI以更新视图。

一旦始终在UI线程上调用CreateView，则此runOnUiThread为unnecessary@AlexanderDadukin是的，我知道在ui线程上总是调用CreateView时，这个RunNoUnitRead是unnecessary@AlexanderDadukin是的，我知道