使用 Kotlin 为跨片段 android 的进度条设置进度条

Question

我对 android studio 和 kotlin 都是业余爱好者。我正在实现一个场景，其中我有一些片段，当我们完成一个片段时，进度会显示在主布局上。这些片段替换了主框架布局，并且从一个片段切换到下一个片段是在前一个片段中使用 setonclicklistener 完成的。但是，问题是我看不到进度条发生的更新。顺便说一句，我没有使用任何进度对话。我需要做的就是在从一个片段切换到另一个片段时更新进度条。当我运行应用程序时，它不会崩溃但不会发生更新。 main_layout 文件如下所示，框架布局由片段替换。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">

<ProgressBar
    android:id="@+id/parentmain_progress"
    android:layout_width="match_parent"
    android:layout_height="25dp"

style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"
    android:scaleY="2"/>
<FrameLayout
    android:id="@+id/parentmain_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@id/parentmain_progress">
</FrameLayout>
</RelativeLayout>

未更新进度的片段之一：

class ParentChildInfoFragment : Fragment() {

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,savedInstanceState: Bundle?): View? {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_parent_info_relation, container, false)

}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    headerparentrelation_text?.text= arguments?.getString("name")
    parentmain_progress?.max=4
    parentmain_progress?.setProgress(3)
    val string = "Your Cild is a....\n Girl/Boy"
    specifying_relation_txt?.text = string

    relation_mom_image?.setImageResource(R.drawable.girl)
    relation_dad_image?.setImageResource(R.drawable.boy)

    val girlstring = "Girl"
    mom_txt?.text = girlstring

    val boystring = "Boy"
    dad_txt?.text=boystring

    nextbtn_parentrelation.setOnClickListener {
        fragmentManager?.beginTransaction()?.replace(R.id.parentmain_frame,ParentInfoFragment())?.commit()
    }
  }
}

感谢任何帮助。

Answer 1

尝试将您的代码放在 onCreateView() 方法中。希望有用！！

Answer 2

尝试

parentmain_progress?.post({
        parentmain_progress?.progress = 3
})

而不是parentmain_progress?.setProgress(3)

Answer 3

像那样？

在这个例子中我使用了新的包结构：Androidx

如果您还没有使用它，只需更改

import androidx.fragment.app.FragmentTransaction

来自

import android.app.FragmentTransaction

您将在这笔存款中找到代码：

https://github.com/Amadou19/Android-Multiple-fragment-with-progressBar---Kotlin.git

  /****************************/
    fragment1.xml
    /****************************/
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#c15d5d">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textSize="30sp"
            android:text="Fragment 1"/>

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:text="Click Me"/>

    </RelativeLayout>

    /****************************/
    Fragment1
    /****************************/
    class Fragment1 : Fragment() {

        interface Fragment1Listner {
            fun onClickFragment1()
        }

        var a1: Fragment1Listner? = null

        override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
            val view = inflater.inflate(R.layout.fragment1, container, false)

            view.findViewById<Button>(R.id.button).setOnClickListener {
                Toast.makeText(activity, "Clicked", Toast.LENGTH_SHORT).show()
                a1?.onClickFragment1()
            }

            return view
        }
    }
    /****************************/
    fragment2.xml
    /****************************/
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#5d80c1">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textSize="30sp"
            android:text="Fragment 2"/>


        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:text="Click Me"/>

    </RelativeLayout>

    /****************************/
    Fragment2
    /****************************/
    class Fragment2 : Fragment() {

        interface Fragment2Listner {
            fun onClickFragment2()
        }

        var a2: Fragment2Listner? = null

        override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
            val view = inflater.inflate(R.layout.fragment2, container, false)

            view.findViewById<Button>(R.id.button2).setOnClickListener {
                Toast.makeText(activity, "Clicked", Toast.LENGTH_SHORT).show()
                a2?.onClickFragment2()
            }

            return view    }

    }

    /****************************/
    fragment3.xml
    /****************************/
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#fab049">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textSize="30sp"
            android:text="Fragment 3"/>

    </RelativeLayout>


    /****************************/
    Fragment3
    /****************************/
    class Fragment3 : Fragment() {


        override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
            val view = inflater.inflate(R.layout.fragment3, container, false)

            return view    }

    }


    /****************************/
    activity_main.xml
    /****************************/
    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context="com.example.amadoutirera.progressbar2.MainActivity">
        <ProgressBar
            android:id="@+id/progress_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal" />
        <FrameLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/progress_bar"/>

    </RelativeLayout>


    /****************************/
    MainActivity
    /****************************/
    class MainActivity : AppCompatActivity(), Fragment1.Fragment1Listner, Fragment2.Fragment2Listner {
    lateinit var progressBar : ProgressBar


        private lateinit var fragment1: Fragment1
        private lateinit var fragment2: Fragment2
        private lateinit var fragment3: Fragment3


        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
            /*------------------------------------------*/
            progressBar = findViewById<ProgressBar>(R.id.progress_bar)
            progressBar.max = 90
            progressBar.progress = 30
            /*------------------------------------------*/
            fragment1 = Fragment1()
            fragment2 = Fragment2()
            fragment3 = Fragment3()
            /*------------------------------------------*/
            fragment1.a1 = this
            fragment2.a2 = this
            /*------------------------------------------*/
            supportFragmentManager.beginTransaction()
                    .replace(R.id.container, fragment1)
                    .commit()
        }
        /*--------------- Onclik interface implementation -------------------*/
        override fun onClickFragment1() {

            supportFragmentManager.beginTransaction()
                    .replace(R.id.container, fragment2)
                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                    .addToBackStack(null)
                    .commit()

            progressBar.incrementProgressBy(30)

        }

        override fun onClickFragment2() {

            supportFragmentManager.beginTransaction()
                    .replace(R.id.container, fragment3)
                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                    .addToBackStack(null)
                    .commit()
            progressBar.incrementProgressBy(30)

        }

        /*------------------------------------------*/
        override fun onBackPressed() {
            super.onBackPressed()
            if(progressBar.progress ==60 || progressBar.progress ==90) progressBar.incrementProgressBy(-30)
        }

    }

使用 Kotlin 为跨片段 android 的进度条设置进度条

Setprogress for a progress bar across fragments android using Kotlin

android

android-progressbar

android-fragments

kotlin

android-framelayout