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santosh-pingleSantosh Pingle
santosh-pingle
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Santosh Pingle
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CRUD operation screen in the demo app. (#2746)
* crud operation show case. * Tab layout, birthdate, and edge cases in tab switching. * code clean up. * code clean up * Address review comment. * Address ui changes. * clear ui state. * address review comments. * refactoring. --------- Co-authored-by: Santosh Pingle <[email protected]>
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‎demo/src/main/java/com/google/android/fhir/demo/CrudOperationFragment.kt

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/*
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* Copyright 2024-2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.fhir.demo
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.MenuItem
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import android.view.View
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import android.view.ViewGroup
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import android.widget.Button
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import android.widget.CheckBox
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import android.widget.EditText
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import android.widget.RadioGroup
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import android.widget.Toast
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import androidx.appcompat.app.AppCompatActivity
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import androidx.fragment.app.Fragment
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import androidx.fragment.app.viewModels
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import androidx.lifecycle.Lifecycle
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import androidx.lifecycle.lifecycleScope
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import androidx.lifecycle.repeatOnLifecycle
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import androidx.navigation.fragment.NavHostFragment
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import com.google.android.fhir.demo.helpers.PatientCreationHelper
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import com.google.android.material.tabs.TabLayout
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import kotlinx.coroutines.launch
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import org.hl7.fhir.r4.model.Enumerations
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class CrudOperationFragment : Fragment() {
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private val crudOperationViewModel: CrudOperationViewModel by viewModels()
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override fun onCreateView(
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inflater: LayoutInflater,
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container: ViewGroup?,
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savedInstanceState: Bundle?,
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): View {
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return inflater.inflate(R.layout.fragment_crud_layout, container, false)
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}
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override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
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super.onViewCreated(view, savedInstanceState)
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setUpActionBar()
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setHasOptionsMenu(true)
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setupUiOnScreenLaunch()
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viewLifecycleOwner.lifecycleScope.launch {
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viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
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crudOperationViewModel.patientUiState.collect { patientUiState ->
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patientUiState?.let {
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when (it.operationType) {
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OperationType.CREATE -> {
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Toast.makeText(requireContext(), "Patient is saved", Toast.LENGTH_SHORT).show()
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}
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OperationType.READ -> displayPatientDetails(it)
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OperationType.UPDATE -> {
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Toast.makeText(requireContext(), "Patient is updated", Toast.LENGTH_SHORT).show()
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}
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OperationType.DELETE -> {
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// Reset the page as the patient has been deleted.
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clearUiFieldValues()
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configureFieldsForOperation(OperationType.DELETE)
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Toast.makeText(requireContext(), "Patient is deleted", Toast.LENGTH_SHORT).show()
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}
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}
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}
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}
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}
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}
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}
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override fun onOptionsItemSelected(item: MenuItem): Boolean {
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return when (item.itemId) {
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android.R.id.home -> {
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NavHostFragment.findNavController(this).navigateUp()
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true
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}
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else -> false
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}
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}
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private fun setUpActionBar() {
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(requireActivity() as AppCompatActivity).supportActionBar?.apply {
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title = requireContext().getString(R.string.crud_operations)
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setDisplayHomeAsUpEnabled(true)
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}
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}
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private fun setupUiOnScreenLaunch() {
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setupTabLayoutChangeListener()
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selectTab(TAB_CREATE)
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setupUiForCrudOperation(OperationType.CREATE)
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requireView().findViewById<Button>(R.id.btnSubmit).setOnClickListener {
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val currentOperationType =
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getOperationTypeByTabPosition(
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requireView().findViewById<TabLayout>(R.id.tabLayoutCrud).selectedTabPosition,
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)
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when (currentOperationType) {
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OperationType.CREATE -> createPatient()
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OperationType.READ -> {
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isPatientCreationRequired()
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crudOperationViewModel.readPatientById()
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}
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OperationType.UPDATE -> updatePatient()
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OperationType.DELETE -> deletePatient()
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}
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}
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}
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private fun setupUiForCrudOperation(operationType: OperationType) {
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when (operationType) {
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OperationType.CREATE -> {
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clearUiFieldValues()
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setPatientIdUiFieldText(PatientCreationHelper.createPatientId())
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updateSubmitButtonText(getString(R.string.create))
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}
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OperationType.READ -> {
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clearUiFieldValues()
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setPatientIdUiFieldText(crudOperationViewModel.currentPatientLogicalId)
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updateSubmitButtonText(getString(R.string.read))
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}
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OperationType.UPDATE -> {
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updateSubmitButtonText(getString(R.string.update))
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crudOperationViewModel.readPatientById()
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}
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OperationType.DELETE -> {
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updateSubmitButtonText(getString(R.string.delete))
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crudOperationViewModel.readPatientById()
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}
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}
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configureFieldsForOperation(operationType)
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}
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private fun updateSubmitButtonText(text: String) {
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requireView().findViewById<Button>(R.id.btnSubmit).text = text
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}
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private fun setPatientIdUiFieldText(patientId: String?) {
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requireView().findViewById<EditText>(R.id.etId).setText(patientId)
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}
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private fun selectTab(position: Int) {
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val tabLayout = requireView().findViewById<TabLayout>(R.id.tabLayoutCrud)
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val tab = tabLayout.getTabAt(position)
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tab?.select()
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}
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private fun setupTabLayoutChangeListener() {
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val tabLayout = requireView().findViewById<TabLayout>(R.id.tabLayoutCrud)
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tabLayout.addOnTabSelectedListener(
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object : TabLayout.OnTabSelectedListener {
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override fun onTabSelected(tab: TabLayout.Tab?) {
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val currentOperationType = getOperationTypeByTabPosition(tab?.position ?: TAB_CREATE)
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setupUiForCrudOperation(currentOperationType)
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}
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override fun onTabUnselected(tab: TabLayout.Tab?) {}
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override fun onTabReselected(tab: TabLayout.Tab?) {}
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},
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)
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}
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private fun clearUiFieldValues() {
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val editTexts =
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listOf(
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R.id.etId,
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R.id.etFirstName,
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R.id.etLastName,
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R.id.etBirthDate,
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)
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editTexts.forEach { editTextId ->
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requireView().findViewById<EditText>(editTextId).apply {
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text.clear()
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clearFocus()
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}
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}
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requireView().findViewById<RadioGroup>(R.id.radioGroupGender).clearCheck()
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requireView().findViewById<CheckBox>(R.id.checkBoxActive).isChecked = false
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}
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private fun configureFieldsForOperation(operationType: OperationType) {
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val isEditable =
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when (operationType) {
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OperationType.CREATE,
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OperationType.UPDATE, -> true
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else -> false
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}
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val views =
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listOf(
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R.id.etFirstName,
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R.id.etLastName,
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R.id.etBirthDate,
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R.id.radioGroupGender,
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R.id.rbMale,
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R.id.rbFemale,
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R.id.rbOther,
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R.id.checkBoxActive,
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)
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views.forEach { viewId -> requireView().findViewById<View>(viewId).isEnabled = isEditable }
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}
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private fun displayPatientDetails(patientUiState: PatientUiState) {
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setPatientIdUiFieldText(patientUiState.patientId)
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requireView().findViewById<EditText>(R.id.etFirstName).apply {
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setText(patientUiState.firstName)
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}
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requireView().findViewById<EditText>(R.id.etLastName).apply {
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setText(patientUiState.lastName ?: "")
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}
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requireView().findViewById<EditText>(R.id.etBirthDate).apply {
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setText(patientUiState.birthDate ?: "")
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}
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val radioGroupGender = requireView().findViewById<RadioGroup>(R.id.radioGroupGender)
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radioGroupGender.clearCheck()
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val genderRadioButtonId =
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when (patientUiState.gender) {
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Enumerations.AdministrativeGender.MALE -> R.id.rbMale
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Enumerations.AdministrativeGender.FEMALE -> R.id.rbFemale
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Enumerations.AdministrativeGender.OTHER -> R.id.rbOther
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else -> null
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}
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genderRadioButtonId?.let { radioGroupGender.check(it) }
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requireView().findViewById<CheckBox>(R.id.checkBoxActive).apply {
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isChecked = patientUiState.isActive
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}
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}
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private fun isPatientCreationRequired(): Boolean {
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if (crudOperationViewModel.currentPatientLogicalId.isNullOrEmpty()) {
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Toast.makeText(requireContext(), "Please create a patient first.", Toast.LENGTH_SHORT).show()
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return true
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}
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return false
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}
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private fun getOperationTypeByTabPosition(tabPosition: Int): OperationType {
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return when (tabPosition) {
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TAB_CREATE -> {
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OperationType.CREATE
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}
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TAB_READ -> {
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OperationType.READ
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}
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TAB_UPDATE -> {
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OperationType.UPDATE
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}
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TAB_DELETE -> {
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OperationType.DELETE
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}
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else -> {
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error("Invalid tab selection.")
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}
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}
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}
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private fun getPatientInput(): PatientInput? {
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val firstName = requireView().findViewById<EditText>(R.id.etFirstName).text.toString().trim()
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if (firstName.isBlank()) {
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Toast.makeText(requireContext(), "First name is required.", Toast.LENGTH_SHORT).show()
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return null
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}
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val lastName = requireView().findViewById<EditText>(R.id.etLastName).text.toString().trim()
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val birthDate = requireView().findViewById<EditText>(R.id.etBirthDate).text.toString().trim()
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if (birthDate.isNotEmpty() && !crudOperationViewModel.isBirthDateValid(birthDate)) {
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Toast.makeText(requireContext(), "Please enter a valid birth date.", Toast.LENGTH_SHORT)
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.show()
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return null
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}
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val selectedGenderId =
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requireView().findViewById<RadioGroup>(R.id.radioGroupGender).checkedRadioButtonId
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val gender =
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when (selectedGenderId) {
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R.id.rbMale -> Enumerations.AdministrativeGender.MALE
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R.id.rbFemale -> Enumerations.AdministrativeGender.FEMALE
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R.id.rbOther -> Enumerations.AdministrativeGender.OTHER
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else -> null
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}
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val isActive = requireView().findViewById<CheckBox>(R.id.checkBoxActive).isChecked
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return PatientInput(firstName, lastName, birthDate, gender, isActive)
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}
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private fun createPatient() {
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getPatientInput()?.let {
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crudOperationViewModel.createPatient(
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patientId = requireView().findViewById<EditText>(R.id.etId).text.toString(),
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firstName = it.firstName,
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lastName = it.lastName,
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birthDate = it.birthDate,
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gender = it.gender,
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isActive = it.isActive,
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)
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}
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}
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private fun updatePatient() {
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if (isPatientCreationRequired()) {
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return
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}
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getPatientInput()?.let {
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crudOperationViewModel.updatePatient(
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firstName = it.firstName,
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lastName = it.lastName,
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birthDate = it.birthDate,
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gender = it.gender,
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isActive = it.isActive,
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)
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}
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}
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private fun deletePatient() {
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if (isPatientCreationRequired()) {
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return
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}
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crudOperationViewModel.currentPatientLogicalId?.let { crudOperationViewModel.deletePatient() }
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}
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companion object {
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private const val TAB_CREATE = 0
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private const val TAB_READ = 1
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private const val TAB_UPDATE = 2
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private const val TAB_DELETE = 3
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}
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}

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