Patients List UI screen & button for old screen launch. #72

pankajkatoch · 2020-06-29T05:58:21Z

Added a sample patient list Recyclable View that shows 20 patients with gender and date of birth
Uses PatientListViewModel to monitor live data, and update the view holders
Added a floating button to launch the old Main activity that loads Fhir and CQL resources.
Loads Fhir bundle with 20 Patients from a Json file in assets folder.

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pankajkatoch · 2020-06-29T11:21:47Z

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jingtang10

Thanks Pankaj!

jingtang10 · 2020-06-29T13:29:26Z

example/src/main/AndroidManifest.xml

+            android:name=".SamplePatientListActivity"
+            android:label="@string/title_samplepatient_list"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>


doesn't this clash with the same intent filter for .MainActivity below? I would try to reduce duplication by removing the same intent filter in the other one.

Removed the action.MAIN and category.LAUNCHER from the erstwhile MainActivity (will be called CqlEvaluationActivity), for now.

Please note that it's fine for multiple activities to be marked as MAIN/LAUNCHER, as it's supposed to create different icons by the Home Launcher App. For the demo purpose, we may subsequently add loading of CQL library and Fhir resources as a separate Main Activity.

can you rename the main activity to cql evaluation?

jingtang10 · 2020-06-29T13:38:14Z

example/src/main/res/layout-w900dp/samplepatient_list.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>


I love this design - but I just don't think we should focus on this right now because it will create additional maintenance cost. For simplicity - can we just stick to the two screen design?

jingtang10 · 2020-06-29T13:39:27Z

example/src/main/res/layout/activity_samplepatient_list.xml

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>


I would rename this file: activity_patient_list.xml

I don't think the word sample adds much. Also making sure each word id separated by '_'.

Removing "sample" from list, and details related components.

jingtang10 · 2020-06-29T13:40:06Z

example/src/main/res/layout/activity_samplepatient_list.xml

+        <include layout="@layout/samplepatient_list" />
+    </FrameLayout>
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton


I would hide/remove this for now.

jingtang10 · 2020-06-29T13:43:00Z

example/src/main/res/layout/patient_list_content.xml

+    android:layout_width="wrap_content" android:layout_height="wrap_content">
+
+    <TextView
+        android:id="@+id/id_text"


can you please change this to a more descriptive name than id_text?

jingtang10 · 2020-06-29T13:45:40Z

example/src/main/AndroidManifest.xml

+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="com.google.fhirengine.example.SamplePatientListActivity" />
+        </activity>
        <activity android:name=".MainActivity">


can you rename this activity if it's not going to be the main activity any more? can you change it to CqlEvaluationActivity or something similar? Thanks

Good idea. Will do it in the upcoming Details UI PR, as other folks seem to be adding many init features in the MainActivity.

jingtang10 · 2020-06-29T13:47:34Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+        val fhirContext = FhirContext.forR4()
+        fhirBundle = fhirContext.newJsonParser().parseResource(Bundle::class.java,
+                jsonString) as Bundle
+        for (i in 1..fhirBundle.entry.size) {


use forEach

jingtang10 · 2020-06-29T13:48:33Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+ */
+object SamplePatients {
+    private val PATIENTS: MutableList<PatientItem> = ArrayList()
+    private val PATIENTS_MAP: MutableMap<String, PatientItem> = HashMap()


add comment to describe this map (from what to what)

rename to lowercase.
use mutableMapOf() for initialisation

Done & done.

jingtang10 · 2020-06-29T13:58:17Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+ * Parses and loads Patient data from the passed JSON String into items that could be used by
+ * PatientListViewModel.
+ */
+object SamplePatients {


If this is a helper class, I would rather not declare it as an object that holds the actual data. I would just make this a utility class without state. It doesn't look like you need the internal state anyway.

Great point!
Done.

jingtang10 · 2020-06-29T14:01:59Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+        // Trigger value update in the view holder when underlying viewmodel changes.
+        viewModel.getPatients().observe(
+                parentActivity, Observer<List<SamplePatients.PatientItem>> { patients ->
+            patientValues = patients


you can use "it" rather than declaring patients as the variable name in this lambda. If you do that you can also rename the patientValues field in this class to patients (which is shorter).

So this lambda becomes:
{ patients = it }

florina-muntenescu · 2020-06-29T15:04:01Z

example/build.gradle

    implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
    implementation "com.squareup.retrofit2:retrofit-mock:$retrofitVersion"
    implementation "com.squareup.okhttp3:logging-interceptor:$okhttpLoggingInterceptorVersion"
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'


do we need this?

I'm not sure. it was added by Android Studio at some point.
Removed.

florina-muntenescu · 2020-06-29T15:04:06Z

example/build.gradle

    implementation "com.squareup.retrofit2:retrofit-mock:$retrofitVersion"
    implementation "com.squareup.okhttp3:logging-interceptor:$okhttpLoggingInterceptorVersion"
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'


create constants for the versions.

florina-muntenescu · 2020-06-29T15:05:03Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+ * possibly patient details, on a two pane device.
+ */
+class SampleItemRecyclerViewAdapter(
+  private val parentActivity: SamplePatientListActivity,


You shouldn't pass the activity and the view model to the adapter

It was an artefact of Android Studio generated Master-Details template, and there it creates this RecylerViewAdapter as an inner class within the List Activity. See Example: FooItemListActivity.kt

Changed it now to use the ListAdapter.

florina-muntenescu · 2020-06-29T15:06:48Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+    private lateinit var patientValues: List<SamplePatients.PatientItem>
+
+    init {
+        onClickListener = View.OnClickListener { v ->


all of this logic should be handled by the activity.

florina-muntenescu · 2020-06-29T15:07:18Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+        }
+
+        // Trigger value update in the view holder when underlying viewmodel changes.
+        viewModel.getPatients().observe(


the activity should observe the patients and pass them on to the adapter via ListAdapter#submitList method

florina-muntenescu · 2020-06-29T15:17:41Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+ */
+object SamplePatients {
+    private val PATIENTS: MutableList<PatientItem> = ArrayList()
+    private val PATIENTS_MAP: MutableMap<String, PatientItem> = HashMap()


rename to lowercase.
use mutableMapOf() for initialisation

florina-muntenescu · 2020-06-29T15:18:51Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+    private val PATIENTS_MAP: MutableMap<String, PatientItem> = HashMap()
+
+    // The resource bundle with Patient objects.
+    private lateinit var fhirBundle: Bundle


keep this as nullable, rather than lateinit as you don't know when getPatientItems is called

Done.
I thought that since getPatientItems was the only public function, so it should've been safe.

florina-muntenescu · 2020-06-29T15:19:44Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+     */
+    fun getPatientItems(jsonString: String): MutableList<PatientItem> {
+        val fhirContext = FhirContext.forR4()
+        fhirBundle = fhirContext.newJsonParser().parseResource(Bundle::class.java,


this creates a parser every time. can we just get the parser as a parameter when we get the jsonString?

Used companion object for creating the parser once. Done.

example/src/main/res/layout/activity_samplepatient_detail.xml

example/src/main/res/values/styles.xml

- Refactored SampleItemRecyclerViewAdapter to use ListAdapter. - Clean separation of Acitivity, ViewHolder and Adapter. - Improved usage of Kotlin idioms. - Removed handling of two panes for a tablet device. - Removed remenanats of boilerplate code from Master-Details template generated code.

pankajkatoch · 2020-07-06T23:06:29Z

Handled all the review comments and suggestions. A couple of them would be handled in the Details PR shortly.

Refactored SampleItemRecyclerViewAdapter to use ListAdapter.
Clean separation of Acitivity, ViewHolder and Adapter.
Improved usage of Kotlin idioms.
Removed handling of two panes for a tablet device.
Removed remenanats of boilerplate code from Master-Details template generated code.

deepankarb · 2020-07-07T03:56:03Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+    }
+}
+
+class PatientItemViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {


Should be internal or private. Default (i.e. omitted) is public. See: https://kotlinlang.org/docs/tutorials/kotlin-for-py/visibility-modifiers.html

This needed to be in its own file. Moved it.

deepankarb · 2020-07-07T04:01:11Z

example/src/main/AndroidManifest.xml

@@ -1,37 +1,36 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--


Seems like the license got removed. For non-java/kotlin files, you have to add it yourself: https://github.com/google/android-fhir#license-headers

Thanks for the pointer.
Ran addlicense for all the missing license headers in xml files.

example/src/main/res/layout/patient_list_item.xml

deepankarb

LGTM.

florina-muntenescu · 2020-07-08T08:22:21Z

example/src/main/java/com/google/fhirengine/example/PatientListViewModel.kt

+ * The ViewModel helper class for SampleItemRecyclerViewAdapter, that is responsible for preparing
+ * data for UI.
+ */
+class PatientListViewModel(jsonString: String) : ViewModel() {


Right now, patients are downloaded when calling FhirEngine.sync. Do we need the json parsing if we can just get them from the FhirEngine?

Will switch to actual patients data in real_data PR next.

Will still likely keep the json parsing facility around, in case

DB is broken or sync isn't working

For showcasing some Fhir objects that are not readily available to sync.

florina-muntenescu · 2020-07-08T08:26:00Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+ * possibly patient details, on a two pane device.
+ */
+class SampleItemRecyclerViewAdapter(
+  private val itemOnClickListener: View.OnClickListener


Instead of passing a View.OnClickListener, pass a function here:

private val onItemClicked: () -> Unit

then in the ViewHolder, just call the function in the OnClickListener implementation.
The caller outside this adapter, shouldn't know (or care) if we're implementing an OnClickListener or whatever other type. It should just care what is the action that should be triggered when an item is clicked

Good point. Moved setting the of onClickListener to PatientItemViewHolder.

florina-muntenescu · 2020-07-08T08:27:25Z

example/src/main/java/com/google/fhirengine/example/SamplePatientDetailActivity.kt

+        setSupportActionBar(findViewById(R.id.detail_toolbar))
+
+        findViewById<FloatingActionButton>(R.id.fab).setOnClickListener { view ->
+            Snackbar.make(view, "Replace with your own detail action", Snackbar.LENGTH_LONG)


can we already remove it now?

florina-muntenescu · 2020-07-08T08:29:07Z

example/src/main/java/com/google/fhirengine/example/SamplePatientDetailFragment.kt

+
+/**
+ * A fragment representing a single SamplePatient detail screen.
+ * This fragment is either contained in a [SamplePatientListActivity]


Was this removed? The comment still covers 2 panes

florina-muntenescu · 2020-07-08T08:30:58Z

example/src/main/java/com/google/fhirengine/example/SamplePatientDetailFragment.kt

+    /**
+     * The dummy content this fragment is presenting.
+     */
+    private var item: DummyDetailsContent.DummyItem? = null


can we get rid of all the DummyDetailsContent and use the actual data we're interested in?

Removed the 2 panes and floating button related code/comments.

Keeping DummyDetailsContent in the interest of keeping the app fully functional for each PR.
Will be remove in the Details PR.

florina-muntenescu · 2020-07-08T08:31:49Z

example/src/main/java/com/google/fhirengine/example/data/DummyDetailsContent.kt

+ *
+ * TODO: Replace all uses of this class before publishing your app.
+ */
+object DummyDetailsContent {


Let's delete this class

Refer to comment above. Will be removed in Details PR.

…lder. Also removed reference to 2 panes. Ran Spotless.

jingtang10 · 2020-07-10T08:45:23Z

example/src/main/AndroidManifest.xml

+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name=".SamplePatientListActivity"


Given that we decided we'll use real data, we shouldn't name these things as sample. Whether it is sample or not has nothing to do with this activity anyway, it's to do with the data layer. So let's remove the word sample from this activity class name, as well as the PatientDetailsActivity class name, and also the patient details xml file.

All instances of word sample have already been removed in upcoming Details UI PR, which I'm waiting to send for review, as I soon as I merge this one to the master.
That also will take care of renaming the MainActivity to CqlEvaluationActivity.

jingtang10 · 2020-07-10T08:46:35Z

example/src/main/AndroidManifest.xml

+            android:name=".SamplePatientListActivity"
+            android:label="@string/title_samplepatient_list"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>


can you rename the main activity to cql evaluation?

jingtang10 · 2020-07-10T08:53:46Z

example/src/main/java/com/google/fhirengine/example/SampleItemRecyclerViewAdapter.kt

+        override fun areItemsTheSame(
+          oldItem: SamplePatients.PatientItem,
+          newItem: SamplePatients.PatientItem
+        ): Boolean = oldItem == newItem


probably should just compare the id.

Done for the comparison.

jingtang10 · 2020-07-10T08:55:19Z

example/src/main/java/com/google/fhirengine/example/SamplePatientDetailActivity.kt

+import androidx.appcompat.app.AppCompatActivity
+
+/**
+ * An activity representing a single SamplePatient detail screen. This


nit :P the comments can fit in fewer lines (line wrapping too aggressive).

Done.
Installed Wrap to Column Plugin, and then Ctrl-Shift-Cmd-W on Macs.

jingtang10 · 2020-07-10T08:55:51Z

example/src/main/java/com/google/fhirengine/example/SamplePatientDetailActivity.kt

+    override fun onOptionsItemSelected(item: MenuItem) =
+            when (item.itemId) {
+                android.R.id.home -> {
+


nit: additional new lines can be removed.

florina-muntenescu

small things.
lgtm after they're addressed

florina-muntenescu · 2020-07-10T10:14:56Z

example/src/main/java/com/google/fhirengine/example/PatientItemViewHolder.kt

+        R.id.dob
+    )
+
+    fun bindTo(patientItem: SamplePatients.PatientItem, onItemClicked: (View) -> Unit) {


if I'm not mistaken, you don't need the view here. maybe you need the PatientItem?

florina-muntenescu · 2020-07-10T10:17:07Z

example/src/main/java/com/google/fhirengine/example/SamplePatientListActivity.kt

+        val recyclerView: RecyclerView = findViewById(R.id.samplepatient_list)
+
+        // Click handler to help display the details about the patients from the list.
+        val onPatientItemClicked: (View) -> Unit = { v ->


As mentioned in the previous comment, you don't need the view here, you need the PatientItem. You can just pass it instead of the view. Like this you don't need to use the tag.

florina-muntenescu · 2020-07-10T10:17:56Z

example/src/main/java/com/google/fhirengine/example/SamplePatientListActivity.kt

+            val intent = Intent(v.context, SamplePatientDetailActivity::class.java).apply {
+                putExtra(SamplePatientDetailFragment.ARG_ITEM_ID, item.id)
+            }
+            v.context.startActivity(intent)


You're already in an activity. You should be able to do something like this.startActivity

Done.
Used this.startActivity and this.applicationContext

florina-muntenescu · 2020-07-10T10:19:50Z

example/src/main/java/com/google/fhirengine/example/SamplePatientListActivity.kt

+        val adapter = SampleItemRecyclerViewAdapter(onPatientItemClicked)
+        recyclerView.adapter = adapter
+
+        patientListViewModel.getPatients().observe(this,


You should be able to use observe from core-ktx to simplify this.
import androidx.lifecycle.observe

The observe() here in patientListViewModel.getPatients().observe() is an instance of androidx.lifecycle.observe.

Here I'm observing any changes to LiveData returned from patientListViewModel.getPatients() - and if so then submitting the list to adapter to update the view.
Are there other better ways of using it?

florina-muntenescu · 2020-07-10T10:20:46Z

example/src/main/java/com/google/fhirengine/example/SamplePatientListActivity.kt

+    private fun getJsonStrForPatientData(): String {
+        val patientJsonFilename = "sample_patients_bundle.json"
+
+        return this.applicationContext.assets.open(patientJsonFilename).bufferedReader().use {


You're in an activity, so you should be able to just do assets.open...

florina-muntenescu · 2020-07-10T10:22:56Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+class SamplePatients {
+    private val patients: MutableList<PatientItem> = ArrayList()
+    // Maps a patient position to PatientItem, used to display both the position and details.
+    private val patients_map: MutableMap<String, PatientItem> = mutableMapOf()


Rename to something more descriptive. Maybe idsPatients?

florina-muntenescu · 2020-07-10T10:23:12Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+ */
+class SamplePatients {
+    private val patients: MutableList<PatientItem> = ArrayList()
+    // Maps a patient position to PatientItem, used to display both the position and details.


is the position a string?
looking lower in the code, it looks like this is not a position, but a patient id.

Corrected.
Maps a temporary patient id to PatientItem, used to display patient information both in list and details.

florina-muntenescu · 2020-07-10T10:27:23Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+
+    private fun addPatientItem(item: PatientItem) {
+        patients.add(item)
+        patients_map[item.id] = item


looks like the map is just the patients, associated by item id
you can construct the map automatically from patients by doing
patients.associateBy { it.id }
after you have constructed the list of patients

Done. Using the kotlin idiom. See the comment below.

florina-muntenescu · 2020-07-10T10:30:42Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+    fun getPatientItems(jsonString: String): List<PatientItem> {
+        fhirBundle = fhirJsonParser.parseResource(Bundle::class.java,
+                jsonString) as Bundle
+        (1..fhirBundle!!.entry.size).forEach {


i think this can be written more idiomatic like this:

patients.addAll(fhirBundle?.entry) patients_map.addAll(patients.associateBy { patient -> patient.id} )

nice. this is what makes kotlin so nice to use.

Did you mean patients_map.putAll()?

Since id is a temporary index for display purpose, fhirBundle?.entry?.resource can't be used directly in the PatientItemList. However you're right no need to use forEach here.

Used a combination of mapIndexed and let to call createPatientItem for each fhirPatient resource.
Also use take() to simply limit patient list size to MAX_RESOURCE_COUNT

florina-muntenescu · 2020-07-10T10:32:16Z

example/src/main/java/com/google/fhirengine/example/data/SamplePatients.kt

+class SamplePatients {
+    private val patients: MutableList<PatientItem> = ArrayList()
+    // Maps a patient position to PatientItem, used to display both the position and details.
+    private val patients_map: MutableMap<String, PatientItem> = mutableMapOf()


It doesn't look like we're using this anywhere. do we need it?

Yes. Used in the Details Page/UI.

* Used kotlin idioms while creating list and maps of PatientItems. * Removed unnecessary passing of view argument in itemClicked handler. * Ran spotless check and apply. * Removal of all remaining occurances of term "sample" would be Details UI PR.

pankajkatoch added 2 commits June 29, 2020 09:57

Patient List view, and a button to launch old load screen.

85d72da

Spotless for Patient List activity related files.

7d2cc80

pankajkatoch requested review from deepankarb, florina-muntenescu and jingtang10 June 29, 2020 05:58

jingtang10 requested changes Jun 29, 2020

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florina-muntenescu suggested changes Jun 29, 2020

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pankajkatoch added 2 commits July 7, 2020 04:04

Run spotless apply.

62983e7

pankajkatoch requested review from florina-muntenescu and jingtang10 July 6, 2020 23:04

deepankarb reviewed Jul 7, 2020

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Added missing license headers.

ad30a45

pankajkatoch requested a review from deepankarb July 7, 2020 09:18

pankajkatoch added 2 commits July 7, 2020 14:56

Spotless Apply added licenses and missing newlines at the end of files.

14adbb4

Added DummyDetailsContent to fix the build failure after github push.

d415c33

deepankarb reviewed Jul 7, 2020

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example/src/main/res/layout/patient_list_item.xml Show resolved Hide resolved

deepankarb reviewed Jul 7, 2020

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florina-muntenescu suggested changes Jul 8, 2020

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Fix separation of concerens between Activity, Adapter and the View Ho…

ec2710f

…lder. Also removed reference to 2 panes. Ran Spotless.

pankajkatoch requested a review from florina-muntenescu July 8, 2020 10:59

jingtang10 approved these changes Jul 10, 2020

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florina-muntenescu approved these changes Jul 10, 2020

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pankajkatoch merged commit 85be48f into master Jul 14, 2020

florina-muntenescu deleted the pk/list_ui branch September 8, 2020 07:55

oscarArismendi mentioned this pull request Sep 19, 2025

bug: include name and dob in DiffUtil content comparison #2885

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Patients List UI screen & button for old screen launch. #72

Patients List UI screen & button for old screen launch. #72

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pankajkatoch commented Jun 29, 2020

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