populate the recyclerview

Author: dconeybe

firebase-dataconnect/demo/src/main/kotlin/com/google/firebase/dataconnect/minimaldemo/ListItemsActivity.kt

@@ -16,12 +16,18 @@
 package com.google.firebase.dataconnect.minimaldemo
 
 import android.os.Bundle
+import android.view.LayoutInflater
 import android.view.View
+import android.view.ViewGroup
 import androidx.activity.viewModels
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.flowWithLifecycle
 import androidx.lifecycle.lifecycleScope
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.google.firebase.dataconnect.minimaldemo.connector.GetAllItemsQuery
 import com.google.firebase.dataconnect.minimaldemo.databinding.ActivityListItemsBinding
+import com.google.firebase.dataconnect.minimaldemo.databinding.ListItemBinding
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.launch
 
@@ -36,6 +42,7 @@ class ListItemsActivity : AppCompatActivity() {
     myApplication = application as MyApplication
 
     viewBinding = ActivityListItemsBinding.inflate(layoutInflater)
+    viewBinding.recyclerView.layoutManager = LinearLayoutManager(this)
     setContentView(viewBinding.root)
 
     lifecycleScope.launch {
@@ -57,18 +64,48 @@ class ListItemsActivity : AppCompatActivity() {
       viewBinding.statusText.text = "Loading Items..."
       viewBinding.statusText.visibility = View.VISIBLE
       viewBinding.recyclerView.visibility = View.GONE
+      viewBinding.recyclerView.adapter = null
     } else if (items !== null) {
-      viewBinding.statusText.text = "Items: $items"
-      viewBinding.statusText.visibility = View.VISIBLE
-      viewBinding.recyclerView.visibility = View.GONE
+      viewBinding.statusText.text = null
+      viewBinding.statusText.visibility = View.GONE
+      viewBinding.recyclerView.visibility = View.VISIBLE
+      val oldAdapter = viewBinding.recyclerView.adapter as? RecyclerViewAdapterImpl
+      if (oldAdapter === null || oldAdapter.items !== items) {
+        viewBinding.recyclerView.adapter = RecyclerViewAdapterImpl(items)
+      }
     } else if (exception !== null) {
       viewBinding.statusText.text = "Loading items FAILED: $exception"
       viewBinding.statusText.visibility = View.VISIBLE
       viewBinding.recyclerView.visibility = View.GONE
+      viewBinding.recyclerView.adapter = null
     } else {
       viewBinding.statusText.text = null
       viewBinding.statusText.visibility = View.GONE
       viewBinding.recyclerView.visibility = View.GONE
     }
   }
+
+  private class RecyclerViewAdapterImpl(val items: List<GetAllItemsQuery.Data.ItemsItem>) :
+    RecyclerView.Adapter<RecyclerViewViewHolderImpl>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerViewViewHolderImpl {
+      val binding = ListItemBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+      return RecyclerViewViewHolderImpl(binding)
+    }
+
+    override fun getItemCount() = items.size
+
+    override fun onBindViewHolder(holder: RecyclerViewViewHolderImpl, position: Int) {
+      holder.bindTo(items[position])
+    }
+  }
+
+  private class RecyclerViewViewHolderImpl(private val binding: ListItemBinding) :
+    RecyclerView.ViewHolder(binding.root) {
+
+    fun bindTo(item: GetAllItemsQuery.Data.ItemsItem) {
+      binding.id.text = item.id.toString()
+      binding.name.text = item.string
+    }
+  }
 }

firebase-dataconnect/demo/src/main/res/layout/list_item.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+Copyright 2024 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/constraintLayout"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="8dp"
+    >
+
+    <TextView
+        android:id="@+id/name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ellipsize="middle"
+        style="@style/TextAppearance.Material3.BodyMedium"
+        />
+
+    <TextView
+        android:id="@+id/id"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:ellipsize="middle"
+        android:layout_marginTop="4dp"
+        style="@style/TextAppearance.Material3.BodySmall"
+        />
+
+</LinearLayout>