1 /*
2  * Copyright 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package androidx.compose.integration.macrobenchmark.target
18 
19 import android.os.Bundle
20 import android.view.LayoutInflater
21 import android.view.View
22 import android.view.ViewGroup
23 import android.widget.TextView
24 import androidx.appcompat.app.AppCompatActivity
25 import androidx.recyclerview.widget.LinearLayoutManager
26 import androidx.recyclerview.widget.PagerSnapHelper
27 import androidx.recyclerview.widget.RecyclerView
28 
29 class RecyclerViewAsCarouselActivity : AppCompatActivity() {
onCreatenull30     override fun onCreate(savedInstanceState: Bundle?) {
31         super.onCreate(savedInstanceState)
32         setContentView(R.layout.activity_view_carousel)
33         val pager = findViewById<RecyclerView>(R.id.carousel)
34         pager.layoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
35         val itemCount = intent.getIntExtra(ExtraItemCount, 3000)
36         val adapter = RecyclerViewAdapter(itemCount)
37         val scroller = PagerSnapHelper()
38         scroller.attachToRecyclerView(pager)
39         pager.adapter = adapter
40         launchIdlenessTracking()
41     }
42 
43     companion object {
44         const val ExtraItemCount = "ITEM_COUNT"
45     }
46 }
47 
48 private class RecyclerViewAdapter(val items: Int) :
49     RecyclerView.Adapter<RecyclerViewAsPagerViewHolder>() {
onCreateViewHoldernull50     override fun onCreateViewHolder(
51         parent: ViewGroup,
52         viewType: Int
53     ): RecyclerViewAsPagerViewHolder {
54         val view =
55             LayoutInflater.from(parent.context)
56                 .inflate(R.layout.recycler_view_as_carousel_item, parent, false)
57 
58         return RecyclerViewAsPagerViewHolder(view)
59     }
60 
onBindViewHoldernull61     override fun onBindViewHolder(holder: RecyclerViewAsPagerViewHolder, position: Int) {
62         holder.bind(position.toString())
63     }
64 
getItemCountnull65     override fun getItemCount(): Int = items
66 }
67 
68 @Suppress("PROPERTY_HIDES_JAVA_FIELD")
69 private class RecyclerViewAsPagerViewHolder(val itemView: View) :
70     RecyclerView.ViewHolder(itemView) {
71     fun bind(item: String) {
72         itemView.findViewById<TextView>(R.id.view_carousel_item).text = item
73     }
74 }
75