我无法通过FAB开始活动或主要活动中的片段

Question

我生成了名为“ adddebtinfo”的新活动+片段

并尝试使用MainActivity中的FAB启动此活动，但它根本无法正常工作。

MainActivity.kt

    var fab: FloatingActionButton = findViewById(R.id.fab)
    fab.setOnClickListener {
        val intent = Intent(this, AddDebtInfoFragment::class.java)
        startActivity(intent)

AddDebtInfoFragment.kt

private lateinit var viewModel: AddDebtInfoViewModel

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View {
    var binding : AddDebtInfoActivityBinding = DataBindingUtil.inflate(inflater ,R.layout.add_debt_info_fragment,container , false)
    return binding.root
}

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    viewModel = ViewModelProviders.of(this).get(AddDebtInfoViewModel::class.java)
    // TODO: Use the ViewModel
}

}

add_debt_info_fragment.xml

<androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/add_debt_info_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.adddebtinfo.AddDebtInfoFragment">

add_debt_info_activity.xml

<FrameLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:context=".AddDebtInfo"/>

Answer 1

您正在尝试使用Intent启动Fragment。您应在以下行中将 response => { token = response; getInfos.getDatastores(token, url) .then(response => { datastores = response; }); getInfos.getPolicies(token, url) .then(response => { policies = response; }); getInfos.getClusters(token, url) .then(response => { cluster = response; }); } 替换为活动名称： then

Answer 2

对于添加/替换片段，您需要单击FAB来执行FragmentTrascations。 要打开新活动，您需要针对FAB的活动/上下文执行startActivity(someIntent)。

Answer 3

Purusann，您想将FragmentTransaction与您拥有的容器FrameLayout一起使用。

fab.setOnClickListener {
   // Create a new Fragment to be placed in the activity layout
        val firstFragment = AddDebtInfoFragment()

        // Add the fragment to the 'container' FrameLayout
        supportFragmentManager.beginTransaction()
                .add(R.id.container, firstFragment).commit()
}

请阅读以下Android文档页面以了解如何使用片段：https://developer.android.com/training/basics/fragments/fragment-ui