From 452271e8c0a7b4ca6261aef2acb9eb2d36f54ba2 Mon Sep 17 00:00:00 2001
From: Tomasz F <pengwius@protonmail.ch>
Date: Wed, 8 Sep 2021 19:11:14 +0200
Subject: [PATCH] [UI] Add list of contributors in Settings. (#15)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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* Contributors item in settings

* Move contributors activity to settings package && actualize branch

* Update AndroidManifest.xml

* Getting contributors from github api

* Cleaning code

* Fetching data from szkolny api, displaying content, a lot of changes :D

* Strings

* Remove androidx legacy library

* Revert manifest changes

* Remove logging in SzkolnyApi

* Fix app name spelling

* Revert changes to dimens.xml

* Refactor contributors code

* Revert changes to dimens.xml

Again

* Revert changes to build.gradle

* Revert changes to gradle-wrapper.properties

* Revert changes to gradle.properties

* Make user name nullable

* Add caching, refactor plurals, add progress bar

* Update contributors UI

* Shorten activity name in manifest

* Remove unneeded line break

* Remove fragment_translators.xml

Co-authored-by: Kuba Szczodrzyński <kuba@szczodrzynski.pl>
---
 app/build.gradle                              |   1 +
 app/src/main/AndroidManifest.xml              |   1 +
 .../pl/szczodrzynski/edziennik/Extensions.kt  |   2 +
 .../edziennik/data/api/szkolny/SzkolnyApi.kt  |  14 ++-
 .../data/api/szkolny/SzkolnyService.kt        |   3 +
 .../szkolny/response/ContributorsResponse.kt  |  20 ++++
 .../lazypager/FragmentLazyPagerAdapter.kt     |   2 +-
 .../settings/cards/SettingsAboutCard.kt       |   9 ++
 .../contributors/ContributorsActivity.kt      |  83 +++++++++++++++
 .../contributors/ContributorsAdapter.kt       |  63 +++++++++++
 .../contributors/ContributorsFragment.kt      |  47 ++++++++
 .../main/res/layout/contributors_activity.xml | 100 ++++++++++++++++++
 .../res/layout/contributors_list_fragment.xml |  10 ++
 .../res/layout/contributors_list_item.xml     |  49 +++++++++
 app/src/main/res/values-de/strings.xml        |   2 +
 app/src/main/res/values-en/plurals.xml        |  11 +-
 app/src/main/res/values-en/strings.xml        |   4 +
 app/src/main/res/values/plurals.xml           |  11 ++
 app/src/main/res/values/strings.xml           |   6 ++
 19 files changed, 432 insertions(+), 6 deletions(-)
 create mode 100644 app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/response/ContributorsResponse.kt
 create mode 100644 app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsActivity.kt
 create mode 100644 app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsAdapter.kt
 create mode 100644 app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsFragment.kt
 create mode 100644 app/src/main/res/layout/contributors_activity.xml
 create mode 100644 app/src/main/res/layout/contributors_list_fragment.xml
 create mode 100644 app/src/main/res/layout/contributors_list_item.xml

diff --git a/app/build.gradle b/app/build.gradle
index 29a434d8..827ae0d6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,6 +1,7 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
+apply plugin: 'kotlin-parcelize'
 apply plugin: 'com.google.gms.google-services'
 apply plugin: 'com.google.firebase.crashlytics'
 
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index af4b653a..cbe7bd48 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -146,6 +146,7 @@
             android:configChanges="orientation|keyboardHidden"
             android:theme="@style/Base.Theme.AppCompat" />
         <activity android:name=".ui.modules.base.BuildInvalidActivity" />
+        <activity android:name=".ui.modules.settings.contributors.ContributorsActivity" />
 
         <!--  _____               _
              |  __ \             (_)
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt b/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
index 8d3b59d1..42eed408 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
@@ -14,6 +14,7 @@ import android.graphics.Typeface
 import android.graphics.drawable.Drawable
 import android.os.Build
 import android.os.Bundle
+import android.os.Parcelable
 import android.text.*
 import android.text.style.CharacterStyle
 import android.text.style.ForegroundColorSpan
@@ -737,6 +738,7 @@ fun Bundle(vararg properties: Pair<String, Any?>): Bundle {
                 is Short -> putShort(property.first, property.second as Short)
                 is Double -> putDouble(property.first, property.second as Double)
                 is Boolean -> putBoolean(property.first, property.second as Boolean)
+                is Array<*> -> putParcelableArray(property.first, property.second as Array<out Parcelable>)
             }
         }
     }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyApi.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyApi.kt
index 95d61224..da64cbc3 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyApi.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyApi.kt
@@ -22,10 +22,7 @@ import pl.szczodrzynski.edziennik.data.api.szkolny.interceptor.ApiCacheIntercept
 import pl.szczodrzynski.edziennik.data.api.szkolny.interceptor.SignatureInterceptor
 import pl.szczodrzynski.edziennik.data.api.szkolny.interceptor.Signing
 import pl.szczodrzynski.edziennik.data.api.szkolny.request.*
-import pl.szczodrzynski.edziennik.data.api.szkolny.response.ApiResponse
-import pl.szczodrzynski.edziennik.data.api.szkolny.response.RegisterAvailabilityStatus
-import pl.szczodrzynski.edziennik.data.api.szkolny.response.Update
-import pl.szczodrzynski.edziennik.data.api.szkolny.response.WebPushResponse
+import pl.szczodrzynski.edziennik.data.api.szkolny.response.*
 import pl.szczodrzynski.edziennik.data.db.entity.Event
 import pl.szczodrzynski.edziennik.data.db.entity.FeedbackMessage
 import pl.szczodrzynski.edziennik.data.db.entity.Notification
@@ -373,6 +370,15 @@ class SzkolnyApi(val app: App) : CoroutineScope {
         throw SzkolnyApiException(null)
     }
 
+    @Throws(Exception::class)
+    fun getContributors(): ContributorsResponse {
+        val response = api.contributors().execute()
+        if (response.isSuccessful && response.body() != null) {
+            return parseResponse(response)
+        }
+        throw SzkolnyApiException(null)
+    }
+
     @Throws(Exception::class)
     fun getFirebaseToken(registerName: String): String {
         val response = api.firebaseToken(registerName).execute()
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyService.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyService.kt
index c4198130..26a9a44e 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyService.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/SzkolnyService.kt
@@ -27,6 +27,9 @@ interface SzkolnyService {
     @POST("appUser")
     fun appUser(@Body request: AppUserRequest): Call<ApiResponse<Unit>>
 
+    @GET("contributors/android")
+    fun contributors(): Call<ApiResponse<ContributorsResponse>>
+
     @GET("updates/app")
     fun updates(@Query("channel") channel: String = "release"): Call<ApiResponse<List<Update>>>
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/response/ContributorsResponse.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/response/ContributorsResponse.kt
new file mode 100644
index 00000000..f824280a
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/response/ContributorsResponse.kt
@@ -0,0 +1,20 @@
+package pl.szczodrzynski.edziennik.data.api.szkolny.response
+
+import android.os.Parcelable
+import kotlinx.parcelize.Parcelize
+
+data class ContributorsResponse(
+    val contributors: List<Item>,
+    val translators: List<Item>
+) {
+
+    @Parcelize
+    data class Item(
+        val login: String,
+        val name: String?,
+        val avatarUrl: String,
+        val profileUrl: String,
+        val itemUrl: String,
+        val contributions: Int?
+    ) : Parcelable
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/base/lazypager/FragmentLazyPagerAdapter.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/base/lazypager/FragmentLazyPagerAdapter.kt
index d6205596..bc794073 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/base/lazypager/FragmentLazyPagerAdapter.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/base/lazypager/FragmentLazyPagerAdapter.kt
@@ -9,7 +9,7 @@ import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 
 class FragmentLazyPagerAdapter(
         fragmentManager: FragmentManager,
-        swipeRefreshLayout: SwipeRefreshLayout,
+        swipeRefreshLayout: SwipeRefreshLayout? = null,
         val fragments: List<Pair<LazyFragment, CharSequence>>
 ) : LazyPagerAdapter(fragmentManager, swipeRefreshLayout) {
     override fun getPage(position: Int) = fragments[position].first
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/cards/SettingsAboutCard.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/cards/SettingsAboutCard.kt
index 5f55ec70..f4cc0023 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/cards/SettingsAboutCard.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/cards/SettingsAboutCard.kt
@@ -24,6 +24,7 @@ import pl.szczodrzynski.edziennik.ui.dialogs.changelog.ChangelogDialog
 import pl.szczodrzynski.edziennik.ui.modules.settings.SettingsCard
 import pl.szczodrzynski.edziennik.ui.modules.settings.SettingsLicenseActivity
 import pl.szczodrzynski.edziennik.ui.modules.settings.SettingsUtil
+import pl.szczodrzynski.edziennik.ui.modules.settings.contributors.ContributorsActivity
 import pl.szczodrzynski.edziennik.utils.Utils
 import kotlin.coroutines.CoroutineContext
 
@@ -90,6 +91,14 @@ class SettingsAboutCard(util: SettingsUtil) : SettingsCard(util), CoroutineScope
             it.subText = BuildConfig.VERSION_NAME + ", " + BuildConfig.BUILD_TYPE
         },
 
+        util.createActionItem(
+            text = R.string.settings_about_contributors_text,
+            subText = R.string.settings_about_contributors_subtext,
+            icon = CommunityMaterial.Icon.cmd_account_group_outline
+        ) {
+            activity.startActivity(Intent(activity, ContributorsActivity::class.java))
+        },
+
         util.createMoreItem(card, items = listOf(
             util.createActionItem(
                 text = R.string.settings_about_changelog_text,
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsActivity.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsActivity.kt
new file mode 100644
index 00000000..676a5d58
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsActivity.kt
@@ -0,0 +1,83 @@
+package pl.szczodrzynski.edziennik.ui.modules.settings.contributors
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.isVisible
+import androidx.viewpager.widget.ViewPager
+import com.google.android.material.tabs.TabLayout
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
+import pl.szczodrzynski.edziennik.App
+import pl.szczodrzynski.edziennik.Bundle
+import pl.szczodrzynski.edziennik.R
+import pl.szczodrzynski.edziennik.data.api.szkolny.SzkolnyApi
+import pl.szczodrzynski.edziennik.data.api.szkolny.response.ContributorsResponse
+import pl.szczodrzynski.edziennik.databinding.ContributorsActivityBinding
+import pl.szczodrzynski.edziennik.ui.modules.base.lazypager.FragmentLazyPagerAdapter
+import pl.szczodrzynski.edziennik.ui.modules.error.ErrorSnackbar
+import kotlin.coroutines.CoroutineContext
+
+class ContributorsActivity : AppCompatActivity(), CoroutineScope {
+    companion object {
+        private const val TAG = "ContributorsActivity"
+        private var contributors: ContributorsResponse? = null
+    }
+
+    private lateinit var app: App
+    private lateinit var b: ContributorsActivityBinding
+
+    private var job = Job()
+    override val coroutineContext: CoroutineContext
+        get() = job + Dispatchers.Main
+
+    // local/private variables go here
+    private val errorSnackbar: ErrorSnackbar by lazy { ErrorSnackbar(this) }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        app = application as App
+        b = ContributorsActivityBinding.inflate(layoutInflater)
+        setContentView(b.root)
+
+        b.progressBar.isVisible = true
+        b.tabLayout.isVisible = false
+        b.viewPager.isVisible = false
+
+        launch {
+            contributors = contributors ?: SzkolnyApi(app).runCatching(errorSnackbar) {
+                getContributors()
+            } ?: return@launch
+
+            val pagerAdapter = FragmentLazyPagerAdapter(
+                supportFragmentManager,
+                fragments = listOf(
+                    ContributorsFragment().apply {
+                        arguments = Bundle(
+                            "items" to contributors!!.contributors.toTypedArray(),
+                            "quantityPluralRes" to R.plurals.contributions_quantity,
+                        )
+                    } to getString(R.string.contributors),
+
+                    ContributorsFragment().apply {
+                        arguments = Bundle(
+                            "items" to contributors!!.translators.toTypedArray(),
+                            "quantityPluralRes" to R.plurals.translations_quantity,
+                        )
+                    } to getString(R.string.translators),
+                )
+            )
+
+            b.viewPager.apply {
+                offscreenPageLimit = 1
+                adapter = pagerAdapter
+                b.tabLayout.setupWithViewPager(this)
+            }
+
+            b.progressBar.isVisible = false
+            b.tabLayout.isVisible = true
+            b.viewPager.isVisible = true
+        }
+    }
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsAdapter.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsAdapter.kt
new file mode 100644
index 00000000..6cb189b9
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsAdapter.kt
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-9-7.
+ */
+
+package pl.szczodrzynski.edziennik.ui.modules.settings.contributors
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.annotation.PluralsRes
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.RecyclerView
+import coil.load
+import coil.transform.CircleCropTransformation
+import pl.szczodrzynski.edziennik.R
+import pl.szczodrzynski.edziennik.data.api.szkolny.response.ContributorsResponse
+import pl.szczodrzynski.edziennik.databinding.ContributorsListItemBinding
+import pl.szczodrzynski.edziennik.plural
+import pl.szczodrzynski.edziennik.setText
+import pl.szczodrzynski.edziennik.utils.Utils
+
+class ContributorsAdapter(
+    val activity: AppCompatActivity,
+    val items: List<ContributorsResponse.Item>,
+    @PluralsRes
+    val quantityPluralRes: Int
+) : RecyclerView.Adapter<ContributorsAdapter.ViewHolder>() {
+    companion object {
+        private const val TAG = "ContributorsAdapter"
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val inflater = LayoutInflater.from(parent.context)
+        val view = ContributorsListItemBinding.inflate(inflater, parent, false)
+        return ViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val item = items[position]
+        val b = holder.b
+
+        b.text.text = item.name ?: item.login
+        b.subtext.setText(
+            R.string.contributors_subtext_format,
+            item.login,
+            activity.plural(
+                quantityPluralRes,
+                item.contributions ?: 0
+            )
+        )
+
+        b.image.load(item.avatarUrl) {
+            transformations(CircleCropTransformation())
+        }
+
+        b.root.setOnClickListener {
+            Utils.openUrl(activity, item.itemUrl)
+        }
+    }
+
+    override fun getItemCount() = items.size
+
+    class ViewHolder(val b: ContributorsListItemBinding) : RecyclerView.ViewHolder(b.root)
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsFragment.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsFragment.kt
new file mode 100644
index 00000000..11741a85
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/settings/contributors/ContributorsFragment.kt
@@ -0,0 +1,47 @@
+package pl.szczodrzynski.edziennik.ui.modules.settings.contributors
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.LinearLayoutManager
+import pl.szczodrzynski.edziennik.App
+import pl.szczodrzynski.edziennik.data.api.szkolny.response.ContributorsResponse
+import pl.szczodrzynski.edziennik.databinding.ContributorsListFragmentBinding
+import pl.szczodrzynski.edziennik.ui.modules.base.lazypager.LazyFragment
+import pl.szczodrzynski.edziennik.utils.SimpleDividerItemDecoration
+
+class ContributorsFragment : LazyFragment() {
+    companion object {
+        private const val TAG = "ContributorsFragment"
+    }
+
+    private lateinit var app: App
+    private lateinit var activity: ContributorsActivity
+    private lateinit var b: ContributorsListFragmentBinding
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        activity = (getActivity() as ContributorsActivity?) ?: return null
+        context ?: return null
+        app = activity.application as App
+        b = ContributorsListFragmentBinding.inflate(inflater)
+        return b.root
+    }
+
+    override fun onPageCreated(): Boolean {
+        val contributorsArray = requireArguments().getParcelableArray("items") as Array<ContributorsResponse.Item>
+        val contributors = contributorsArray.toList()
+        val quantityPluralRes = requireArguments().getInt("quantityPluralRes")
+
+        val adapter = ContributorsAdapter(activity, contributors, quantityPluralRes)
+        b.list.adapter = adapter
+        b.list.apply {
+            setHasFixedSize(true)
+            layoutManager = LinearLayoutManager(context)
+            addItemDecoration(SimpleDividerItemDecoration(context))
+            addOnScrollListener(onScrollListener)
+        }
+
+        return true
+    }
+}
diff --git a/app/src/main/res/layout/contributors_activity.xml b/app/src/main/res/layout/contributors_activity.xml
new file mode 100644
index 00000000..b05e9c37
--- /dev/null
+++ b/app/src/main/res/layout/contributors_activity.xml
@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <ProgressBar
+            android:id="@+id/progressBar"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_gravity="center"
+            tools:visibility="gone" />
+
+        <androidx.coordinatorlayout.widget.CoordinatorLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:fitsSystemWindows="true">
+
+            <com.google.android.material.appbar.AppBarLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:minHeight="?actionBarSize">
+
+                <com.google.android.material.appbar.CollapsingToolbarLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="match_parent"
+                    android:minHeight="?actionBarSize"
+                    app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
+
+                    <LinearLayout
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"
+                        android:orientation="vertical"
+                        android:paddingBottom="?actionBarSize"
+                        app:layout_collapseMode="parallax"
+                        app:layout_collapseParallaxMultiplier="0.7">
+
+                        <ImageView
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            android:layout_gravity="center_horizontal"
+                            android:layout_marginTop="16dp"
+                            android:scaleType="center"
+                            android:scaleX="0.8"
+                            android:scaleY="0.8"
+                            android:src="@mipmap/ic_splash" />
+
+                        <TextView
+                            android:layout_width="match_parent"
+                            android:layout_height="wrap_content"
+                            android:layout_marginHorizontal="64dp"
+                            android:fontFamily="sans-serif-light"
+                            android:gravity="center"
+                            android:text="@string/app_name"
+                            android:textAppearance="@style/NavView.TextView.Large"
+                            android:textSize="28sp"
+                            android:textStyle="bold" />
+
+                        <TextView
+                            android:layout_width="match_parent"
+                            android:layout_height="wrap_content"
+                            android:layout_marginHorizontal="64dp"
+                            android:layout_marginBottom="48dp"
+                            android:fontFamily="sans-serif-light"
+                            android:gravity="center"
+                            android:text="@string/contributors_headline"
+                            android:textAppearance="@style/NavView.TextView.Medium" />
+                    </LinearLayout>
+
+                    <com.google.android.material.tabs.TabLayout
+                        android:id="@+id/tabLayout"
+                        android:layout_width="match_parent"
+                        android:layout_height="?actionBarSize"
+                        android:layout_gravity="bottom"
+                        android:background="?android:colorBackground"
+                        android:foreground="@color/colorSurface_2dp"
+                        android:minHeight="?actionBarSize"
+                        android:visibility="gone"
+                        app:tabIndicatorColor="?colorPrimary"
+                        app:tabMode="auto"
+                        app:tabSelectedTextColor="?colorPrimary"
+                        app:tabTextColor="?android:textColorPrimary"
+                        tools:visibility="visible" />
+                </com.google.android.material.appbar.CollapsingToolbarLayout>
+            </com.google.android.material.appbar.AppBarLayout>
+
+            <pl.szczodrzynski.edziennik.ui.modules.base.lazypager.LazyViewPager
+                android:id="@+id/viewPager"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:visibility="gone"
+                app:layout_behavior="@string/appbar_scrolling_view_behavior"
+                tools:visibility="visible" />
+        </androidx.coordinatorlayout.widget.CoordinatorLayout>
+    </LinearLayout>
+</layout>
diff --git a/app/src/main/res/layout/contributors_list_fragment.xml b/app/src/main/res/layout/contributors_list_fragment.xml
new file mode 100644
index 00000000..70d3d1c5
--- /dev/null
+++ b/app/src/main/res/layout/contributors_list_fragment.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/list"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:listitem="@layout/contributors_list_item" />
+</layout>
diff --git a/app/src/main/res/layout/contributors_list_item.xml b/app/src/main/res/layout/contributors_list_item.xml
new file mode 100644
index 00000000..5029203d
--- /dev/null
+++ b/app/src/main/res/layout/contributors_list_item.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="?selectableItemBackground"
+        android:gravity="center_vertical"
+        android:orientation="horizontal">
+
+        <ImageView
+            android:id="@+id/image"
+            android:layout_width="72dp"
+            android:layout_height="72dp"
+            android:padding="12dp"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            app:srcCompat="@drawable/ic_account_circle" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:orientation="vertical"
+            android:paddingHorizontal="8dp"
+            android:paddingVertical="16dp">
+
+            <TextView
+                android:id="@+id/text"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:ellipsize="end"
+                android:singleLine="true"
+                android:textAppearance="@style/NavView.TextView.Subtitle"
+                tools:text="der Librüsch" />
+
+            <TextView
+                android:id="@+id/subtext"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:ellipsize="end"
+                android:singleLine="true"
+                android:textAppearance="@style/NavView.TextView.Helper"
+                tools:text="[at]librüsch - ∞ contributions" />
+        </LinearLayout>
+    </LinearLayout>
+</layout>
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 18190d60..b86e42af 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -1234,4 +1234,6 @@
     <string name="you_are_offline_title">Netzwerkverbindung</string>
     <string name="login_summary_account_child">(Kind)</string>
     <string name="login_summary_account_parent">(Elternteil)</string>
+    <string name="settings_about_contributors_text">Anwendungsentwickler</string>
+    <string name="settings_about_contributors_subtext">Liste der Szkolny-Entwickler</string>
 </resources>
diff --git a/app/src/main/res/values-en/plurals.xml b/app/src/main/res/values-en/plurals.xml
index 1bada092..a600f325 100644
--- a/app/src/main/res/values-en/plurals.xml
+++ b/app/src/main/res/values-en/plurals.xml
@@ -55,4 +55,13 @@
         <item quantity="one">%1$s - %2$d unread</item>
         <item quantity="other">%1$s - %2$d unread</item>
     </plurals>
-</resources>
\ No newline at end of file
+
+    <plurals name="contributions_quantity">
+        <item quantity="one">%d contribution</item>
+        <item quantity="other">%d contributions</item>
+    </plurals>
+    <plurals name="translations_quantity">
+        <item quantity="one">%d translation</item>
+        <item quantity="other">%d translations</item>
+    </plurals>
+</resources>
diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index d34932b7..a557681a 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -1237,6 +1237,10 @@
     <string name="permissions_attachment">In order to download the file, you have to grant file storage permission for the application.\n\nClick OK to grant the permission.</string>
     <string name="permissions_denied">You denied the required permissions for the application.\n\nIn order to grant the permission, open the Permissions screen for Szkolny.eu in phone settings.\n\nClick OK to open app settings now.</string>
     <string name="permissions_required">Required permissions</string>
+    <string name="settings_about_contributors_text">App contributors</string>
+    <string name="settings_about_contributors_subtext">List of Szkolny.eu contributors</string>
+    <string name="contributors">Contributors</string>
+    <string name="translators">Translators</string>
     <string name="settings_register_hide_sticks_from_old">Hide sticks from old</string>
     <string name="build_official">Official build</string>
     <string name="build_platform_play">Google Play</string>
diff --git a/app/src/main/res/values/plurals.xml b/app/src/main/res/values/plurals.xml
index bb74ba85..bcd87eca 100644
--- a/app/src/main/res/values/plurals.xml
+++ b/app/src/main/res/values/plurals.xml
@@ -159,4 +159,15 @@
         <item quantity="few">%d oceny</item> <!-- 2, 3, 4, 32, 33, 34 -->
         <item quantity="other">%d ocen</item> <!-- 5, 10, 12, 13, 21, 25 -->
     </plurals>
+
+    <plurals name="contributions_quantity">
+        <item quantity="one">%d commit</item>
+        <item quantity="few">%d commity</item>
+        <item quantity="other">%d commit\'ów</item>
+    </plurals>
+    <plurals name="translations_quantity">
+        <item quantity="one">%d tłumaczenie</item>
+        <item quantity="few">%d tłumaczenia</item>
+        <item quantity="other">%d tłumaczeń</item>
+    </plurals>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2043046f..b11631b5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1391,6 +1391,10 @@
     <string name="see_also">Zobacz także</string>
     <string name="settings_about_homepage_text">Wejdź na stronę aplikacji</string>
     <string name="settings_about_homepage_subtext">Uzyskaj pomoc lub wesprzyj autorów</string>
+    <string name="settings_about_contributors_text">Twórcy aplikacji</string>
+    <string name="settings_about_contributors_subtext">Lista twórców Szkolnego</string>
+    <string name="contributors">Współtwórcy</string>
+    <string name="translators">Tłumacze</string>
     <string name="settings_about_github_text">Kod źródłowy</string>
     <string name="settings_about_github_subtext">Pomóż w rozwoju aplikacji na GitHubie</string>
     <string name="profile_config_name_hint">Nazwa profilu</string>
@@ -1457,4 +1461,6 @@
     <string name="notification_grade_long_format">Ocena: %s (waga %s)\nPrzedmiot: %s\nKategoria: %s\nOpis: %s\nNauczyciel: %s</string>
     <string name="notification_notice_long_format">Rodzaj: %s\nNauczyciel: %s\nTreść: %s</string>
     <string name="notification_attendance_long_format">Rodzaj: %s\nTermin: %s, %s\nNr lekcji: %s\nPrzedmiot: %s\nNauczyciel: %s\nTemat lekcji: %s</string>
+    <string name="contributors_subtext_format" translatable="false">\@%s - %s</string>
+    <string name="contributors_headline">Najłatwiejszy sposób na korzystanie z e-dziennika.</string>
 </resources>