ViewPager主机片段与ViewPager片段项之间的通信
ViewPager主机片段与ViewPager片段项之间的通信
提问于 2021-05-03 20:14:28
我有一个具有viewpager的片段(viewpager)，在该片段中，我初始化了一个适配器(InsiraDocumentoAdapter)来初始化viewpager。适配器(InsiraDocumentoAdapter)初始化我动态更新的通用片段(DocumentoFragment)，现在我可以更新它中显示的图像，但是我需要单击该图像来更改它或删除它，但是这需要在包含viewpager的片段中完成，因为在这个片段(InsiraDocumentosFragment)中，我有与数据库通信的viewmodel。我如何从InsiraDocumentosFragment观看点击imageview of DocumentFragment？
这是我的代码样本。
class InsiraDocumentosFragment : Fragment() {
private lateinit var _view: View
private lateinit var _imgBack: ImageView
private lateinit var _viewpager: ViewPager
private lateinit var _imgCamera: ImageView
private lateinit var _footerTitle: TextView
private lateinit var _titles: List<String>
private lateinit var _files: MutableList<File?>
private lateinit var _viewModel: DocumentoViewModel
private lateinit var _viewModelProposta: PropostaViewModel
private lateinit var _viewModelArquivo: ArquivoViewModel
private lateinit var _adapter: InsiraDocumentoAdapter
private lateinit var _proposta: PropostaEntity
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? = inflater.inflate(R.layout.fragment_insira_documento, container, false)
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
_view = view
_imgBack = _view.findViewById(R.id.imgBack)
_viewpager = _view.findViewById(R.id.viewpager)
_imgCamera = _view.findViewById(R.id.cameraDocumento)
_footerTitle = _view.findViewById(R.id.footerTitle)
_files = mutableListOf(null, null, null)
_titles = listOf(getString(R.string.identidade), getString(R.string.comprovante_renda), getString(R.string.foto))
_adapter = InsiraDocumentoAdapter(_titles, _files, childFragmentManager)
_viewpager.adapter = _adapter
_viewModel = ViewModelProvider(
this,
DocumentoViewModel.DocumentoViewModelFactory(DocumentoRepositorio(AppDatabase.getDatabase(_view.context).documentoDao()))
).get(DocumentoViewModel::class.java)
_viewModelProposta = ViewModelProvider(
this,
PropostaViewModel.PropostaViewModelFactory(PropostaRepositorio(AppDatabase.getDatabase(_view.context).propostaDao()))
).get(PropostaViewModel::class.java)
_viewModelArquivo = ViewModelProvider(
this,
ArquivoViewModel.ArquivoViewModelFactory(ArquivoRepositorio(AppDatabase.getDatabase(_view.context).arquivoDao()))
).get(ArquivoViewModel::class.java)
addViewPagerListener()
onClickImgBack()
onClickImgCamera()
onClickFooterTitle()
val propostaStr = arguments?.getString(PROPOSTA)
if (!propostaStr.isNullOrBlank()) {
_proposta = jsonToObjProposta(propostaStr)
}
}
private fun addViewPagerListener() {
_viewpager.addOnPageChangeListener(object : OnPageChangeListener {
override fun onPageScrollStateChanged(state: Int) {}
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}
override fun onPageSelected(position: Int) {
if (position == _viewpager.adapter!!.count - 1) {
_footerTitle.text = getString(R.string.concluir)
} else {
_footerTitle.text = getString(R.string.proximo)
}
updateViewPagerLayout(position)
}
})
}
private fun updateViewPagerLayout(currentPage: Int) {
when (currentPage) {
0 -> {
habilitaIndicadorPagina(_view.findViewById(R.id.primeiraPagina), _view.findViewById(R.id.imgPrimeiraPagina), R.drawable.primeira_pagina_selecionada)
desabilitaIndicadorPagina(_view.findViewById(R.id.segundaPagina), _view.findViewById(R.id.imgSegundaPagina), R.drawable.segunda_pagina_nao_selecionada)
desabilitaIndicadorPagina(_view.findViewById(R.id.terceiraPagina), _view.findViewById(R.id.imgTerceiraPagina), R.drawable.terceira_pagina_nao_selecionada)
}
1 -> {
desabilitaIndicadorPagina(_view.findViewById(R.id.primeiraPagina), _view.findViewById(R.id.imgPrimeiraPagina), R.drawable.primeira_pagina_nao_selecionada)
habilitaIndicadorPagina(_view.findViewById(R.id.segundaPagina), _view.findViewById(R.id.imgSegundaPagina), R.drawable.segunda_pagina_selecionada)
desabilitaIndicadorPagina(_view.findViewById(R.id.terceiraPagina), _view.findViewById(R.id.imgTerceiraPagina), R.drawable.terceira_pagina_nao_selecionada)
}
2 -> {
desabilitaIndicadorPagina(_view.findViewById(R.id.primeiraPagina), _view.findViewById(R.id.imgPrimeiraPagina), R.drawable.primeira_pagina_nao_selecionada)
desabilitaIndicadorPagina(_view.findViewById(R.id.segundaPagina), _view.findViewById(R.id.imgSegundaPagina), R.drawable.segunda_pagina_nao_selecionada)
habilitaIndicadorPagina(_view.findViewById(R.id.terceiraPagina), _view.findViewById(R.id.imgTerceiraPagina), R.drawable.terceira_pagina_selecionada)
}
}
}
private fun desabilitaIndicadorPagina(layout: ConstraintLayout, image: ImageView, imageDrawable: Int) {
layout.setBackgroundResource(R.drawable.not_selected_indicator)
image.setBackgroundResource(imageDrawable)
}
private fun habilitaIndicadorPagina(layout: ConstraintLayout, image: ImageView, imageDrawable: Int, ) {
layout.setBackgroundResource(R.drawable.indicador_selecionado)
image.setBackgroundResource(imageDrawable)
}
private fun onClickFooterTitle() {
_footerTitle.setOnClickListener {
if (_viewpager.currentItem == _viewpager.adapter!!.count - 1) {
var success = true
for (i in 0..2) {
if (_files[i] == null || _files[i]?.path.isNullOrEmpty()) {
Toast.makeText(_view.context, R.string.favor_preencher_todas_as_fotos, Toast.LENGTH_LONG).show()
_viewpager.currentItem = i
success = false
break
}
}
if (success) {
_viewModelProposta.addProposta(_proposta.numeroProposta, _proposta.valorPropasta, _proposta.clienteId).observe(viewLifecycleOwner, { idProposta ->
_proposta.id = idProposta
_viewModel.addDocumento("Nome do Documento", _proposta.id).observe(viewLifecycleOwner, { idDocumento ->
val arquivos = mutableListOf<ArquivoEntity>()
for (i in 0..2) {
arquivos.add(ArquivoEntity(0, _files[i]!!.path, _titles[i], idDocumento))
}
_viewModelArquivo.addArquivos(arquivos).observe(viewLifecycleOwner, {
_view.findNavController().popBackStack(R.id.clienteFragment, false)
})
})
})
}
} else {
_viewpager.currentItem = _viewpager.currentItem + 1
}
}
}
private fun onClickImgBack() {
_imgBack.setOnClickListener {
_view.findNavController().navigateUp()
}
}
private fun onClickImgCamera() {
_imgCamera.setOnClickListener {
val intent = Intent(_view.context, ScannerActivity::class.java)
startActivityForResult(intent, REQUEST_CODE)
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK) {
val mediaList = ScannerActivity.getOutputDirectory(_view.context).listFiles()?.toMutableList() ?: mutableListOf()
if (mediaList.size > 0) {
val documentoFile = mediaList[mediaList.size - 1]
_files.removeAt(_viewpager.currentItem)
_files.add(_viewpager.currentItem, documentoFile)
_adapter.notifyDataSetChanged()
}
}
}
private fun jsonToObjProposta(json: String): PropostaEntity {
val gson = Gson()
val arrayTutorialType = object : TypeToken<PropostaEntity>() {}.type
return gson.fromJson(json, arrayTutorialType)
}
override fun onResume() {
super.onResume()
_view = requireView()
}
companion object {
const val REQUEST_CODE = 1
const val IMAGE = "IMAGE"
const val ID_PROPOSTA = "ID_PROPOSTA"
const val PROPOSTA = "PROPOSTA"
}
}class InsiraDocumentoAdapter(private val titles: List<String>, private var files: List<File?>, manager: FragmentManager): FragmentStatePagerAdapter(manager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
override fun getCount() = 3
override fun getItem(position: Int): Fragment {
return DocumentoFragment.newInstance(titles[position], files[position])
}
override fun getItemPosition(`object`: Any): Int {
return POSITION_NONE
}
}class DocumentoFragment : Fragment() {
private lateinit var _view: View
private lateinit var _documento: ImageView
private lateinit var _documentoShape: ImageView
private lateinit var _txtTitle: TextView
private var _file: File? = null
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? = inflater.inflate(R.layout.fragment_documento, container, false)
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
_view = view
}
private fun setUpView() {
_documento = _view.findViewById(R.id.documento)
_documentoShape = _view.findViewById(R.id.documentoShape)
_txtTitle = _view.findViewById(R.id.txtTitle)
_txtTitle.text = arguments?.getString(TITLE)
if (!arguments?.getString(FILE).isNullOrEmpty()) {
_file = File(arguments?.getString(FILE))
}
onImgClick()
insereImagem()
}
private fun onImgClick() {
_documento.setOnClickListener {
if (_documentoShape.visibility == View.GONE && _file != null) {
val intent = Intent(_view.context, FullScreenActivity::class.java)
intent.putExtra(InsiraDocumentosFragment.IMAGE, _file?.path)
intent.putExtra(TITLE, _txtTitle.text)
startActivity(intent)
}
}
}
private fun insereImagem() {
if (_file != null) {
Picasso.get().load(_file!!).into(_view.findViewById<ImageView>(R.id.documento))
_view.findViewById<ImageView>(R.id.documentoShape)?.visibility = View.GONE
} else {
_view.findViewById<ImageView>(R.id.documentoShape)?.visibility = View.VISIBLE
}
}
override fun onResume() {
super.onResume()
setUpView()
}
companion object {
fun newInstance(title: String, file: File?): DocumentoFragment {
val fragmentFirst = DocumentoFragment()
val args = bundleOf(
TITLE to title,
FILE to file?.path
)
fragmentFirst.arguments = args
return fragmentFirst
}
const val TITLE = "TITLE"
const val FILE = "FILE"
}
}<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".documento.view.DocumentoFragment">
<TextView
android:id="@+id/txtTitle"
android:layout_width="wrap_content"
android:layout_height="@dimen/dimen_24dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
tools:text="Identidade"
android:textColor="#015669"
android:textSize="@dimen/dimen_20sp"
/>
<ImageView
android:id="@+id/documento"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#ffffff"
android:src="@drawable/rectangle_white"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/txtTitle"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:scaleType="fitXY"
android:layout_marginTop="@dimen/dimen_20dp"
android:contentDescription="@string/foto_documento"/>
<ImageView
android:id="@+id/documentoShape"
android:layout_width="88dp"
android:layout_height="101dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:src="@drawable/document_shape"
android:contentDescription="@string/foto_documento"/>
</androidx.constraintlayout.widget.ConstraintLayout><?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".documento.view.InsiraDocumentosFragment"
android:background="#f0f0f0">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="@dimen/dimen_56dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:background="@drawable/rectangle_blue_toolbar">
<ImageView
android:id="@+id/imgBack"
android:layout_width="@dimen/dimen_12dp"
android:layout_height="@dimen/dimen_20dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginStart="@dimen/dimen_20dp"
android:layout_marginTop="18dp"
android:src="@drawable/tint_color"
android:contentDescription="@string/voltar"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:text="@string/insira_os_documentos"
android:textColor="#ffffff"
android:textSize="@dimen/dimen_20sp"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/pagerIndicator"
android:layout_width="wrap_content"
android:layout_height="@dimen/dimen_30dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/toolbar"
android:layout_marginTop="@dimen/dimen_20dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/primeiraPagina"
android:layout_width="@dimen/dimen_30dp"
android:layout_height="@dimen/dimen_30dp"
android:background="@drawable/indicador_selecionado"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/segundaPagina"
android:layout_marginHorizontal="@dimen/dimen_10dp"
>
<ImageView
android:id="@+id/imgPrimeiraPagina"
android:layout_width="@dimen/dimen_9dp"
android:layout_height="@dimen/dimen_18dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:background="@drawable/primeira_pagina_selecionada"/>
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/segundaPagina"
android:layout_width="@dimen/dimen_30dp"
android:layout_height="@dimen/dimen_30dp"
android:background="@drawable/not_selected_indicator"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toEndOf="@id/primeiraPagina"
android:layout_marginHorizontal="@dimen/dimen_10dp"
>
<ImageView
android:id="@+id/imgSegundaPagina"
android:layout_width="@dimen/dimen_9dp"
android:layout_height="@dimen/dimen_18dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:background="@drawable/segunda_pagina_nao_selecionada"/>
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/terceiraPagina"
android:layout_width="@dimen/dimen_30dp"
android:layout_height="@dimen/dimen_30dp"
android:background="@drawable/not_selected_indicator"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toEndOf="@id/segundaPagina"
android:layout_marginHorizontal="@dimen/dimen_10dp"
>
<ImageView
android:id="@+id/imgTerceiraPagina"
android:layout_width="@dimen/dimen_9dp"
android:layout_height="@dimen/dimen_18dp"
android:layout_gravity="center"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:background="@drawable/terceira_pagina"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.viewpager.widget.ViewPager
android:id="@+id/viewpager"
android:layout_width="@dimen/dimen_280dp"
android:layout_height="0dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/pagerIndicator"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toTopOf="@id/footer"
android:layout_marginHorizontal="@dimen/dimen_40dp"
android:layout_marginTop="@dimen/dimen_20dp"
android:layout_marginBottom="@dimen/dimen_20dp"/>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/footer"
android:layout_width="match_parent"
android:layout_height="@dimen/dimen_69dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:background="@drawable/footer">
<ImageView
android:id="@+id/imgDocumento"
android:layout_width="@dimen/dimen_26dp"
android:layout_height="@dimen/dimen_30dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginStart="@dimen/dimen_20dp"
android:layout_marginVertical="@dimen/dimen_20dp"
android:src="@drawable/combined_shape"
android:backgroundTint="#0179b0"
android:contentDescription="@string/formato_documento"
/>
<TextView
android:id="@+id/footerTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="@id/imgDocumento"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toStartOf="@+id/cameraDocumento"
app:layout_constraintBottom_toBottomOf="parent"
android:textSize="@dimen/dimen_20sp"
android:textColor="#0179b0"
android:gravity="center"
android:text="@string/proximo"/>
<ImageView
android:id="@+id/cameraDocumento"
android:layout_width="@dimen/dimen_33dp"
android:layout_height="@dimen/dimen_30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginEnd="@dimen/dimen_20dp"
android:layout_marginVertical="@dimen/dimen_20dp"
android:src="@drawable/camera_shape"
android:backgroundTint="#0179b0"
android:contentDescription="@string/capturar_foto"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>Stack Overflow用户
回答已采纳
发布于 2021-05-03 21:12:28
--我需要点击该图像才能更改它或删除它，但是这需要在包含查看器的片段中完成，因为在这个片段(InsiraDocumentosFragment)中，我有一个与数据库通信的视图模型。
你有几个选择可以这样做：
第一个：
通过在两个片段中实例化ViewModel，使两个片段(InsiraDocumentosFragment & DocumentoFragment)之间共享它，并将活动作为所有者使用托管两个片段的requireActivity()：
val viewModel =
ViewModelProvider(requireActivity()).get(MyViewModel::class.java)然后，不需要访问父片段来更改映像；因为现在在ViewModel中有了DocumentoFragment的一个实例。
第二个：
使用InsiraDocumentosFragment从DocumentoFragment访问requireParentFragment()，但首先在父级中创建一个方法，您希望从页面片段中调用该方法来完成所需的工作。
假设您在InsiraDocumentosFragment中创建的方法是someMethodInParent()
在DocumentoFragment中
val parentFragment = requireParentFragment() as InsiraDocumentosFragment
parentFragment.someMethodInParent()页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67375254
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