a lot of groups-related stuff, still WIP

app/src/main/AndroidManifest.xml

@@ -64,6 +64,14 @@
                 android:name=".activities.GroupActivity"
                 android:exported="false"
                 android:theme="@style/Theme.BarcodeScannerForEmployees"/>
+        <activity
+                android:name=".activities.ManageGroupActivity"
+                android:exported="false"
+                android:theme="@style/Theme.BarcodeScannerForEmployees"/>
+        <activity
+                android:name=".activities.MyGroupsActivity"
+                android:exported="false"
+                android:theme="@style/Theme.BarcodeScannerForEmployees"/>
         <activity
                 android:name=".activities.FullscreenActivity"
                 android:configChanges="orientation|keyboardHidden|screenSize"

app/src/main/java/org/foxarmy/barcodescannerforemployees/Net.kt

@@ -20,9 +20,10 @@ class Net {
 
             val client = OkHttpClient()
 
-            val formBody = FormBody.Builder()
+            val body = FormBody.Builder()
-            formBody.add("barcode", barcode)
+                .add("barcode", barcode)
-            val body = formBody.build()
+                .build()
+
             val request = Request.Builder()
                 .url(url)
                 .post(body)
@@ -45,10 +46,10 @@ class Net {
         thread {
             val client = OkHttpClient()
 
-            val formBody = FormBody.Builder()
+            val body = FormBody.Builder()
-            formBody.add("username", username)
+                .add("username", username)
-            formBody.add("password", password)
+                .add("password", password)
-            val body = formBody.build()
+                .build()
 
             val request = Request.Builder()
                 .url("https://$server/api/user/register")
@@ -68,11 +69,10 @@ class Net {
         thread {
             val client = OkHttpClient()
 
-            val formBody = FormBody.Builder()
+            val body = FormBody.Builder()
-            formBody.add("username", username)
+                .add("username", username)
-            formBody.add("password", password)
+                .add("password", password)
-            val body = formBody.build()
+                .build()
-
             val requestLogin = Request.Builder()
                 .url("https://$server/api/user/login")
                 .post(body)
@@ -92,21 +92,20 @@ class Net {
             val client = OkHttpClient()
 
             val body = MultipartBody.Builder()
-            body.setType("multipart/form-data".toMediaType())
+                .setType("multipart/form-data".toMediaType())
-            body.addFormDataPart("file", imageFile.name, imageFile.asRequestBody("image/png".toMediaTypeOrNull()))
+                .addFormDataPart("file", imageFile.name, imageFile.asRequestBody("image/png".toMediaTypeOrNull()))
-            body.addFormDataPart("groupId", groupId.toString())
+                .addFormDataPart("groupId", groupId.toString())
-            body.addFormDataPart("localId", abstractProduct.id.toString())
+                .addFormDataPart("localId", abstractProduct.id.toString())
-            body.addFormDataPart("barcode", abstractProduct.barcode)
+                .addFormDataPart("barcode", abstractProduct.barcode)
-            body.addFormDataPart("name", abstractProduct.name)
+                .addFormDataPart("name", abstractProduct.name)
-            body.addFormDataPart("net_weight", abstractProduct.netWeight.toString())
+                .addFormDataPart("net_weight", abstractProduct.netWeight.toString())
-            body.addFormDataPart("category", abstractProduct.category.toString())
+                .addFormDataPart("category", abstractProduct.category.toString())
-            body.addFormDataPart("unit", abstractProduct.unit.toString())
+                .addFormDataPart("unit", abstractProduct.unit.toString())
-
+                .build()
-            val requestBody = body.build()
 
             val request = Request.Builder()
                 .url("https://$server/api/abstractproduct/create")
-                .post(requestBody)
+                .post(body)
                 .addHeader("Authorization", "Bearer $token")
                 .addHeader("accept-language", language)
                 .build()
@@ -129,7 +128,8 @@ class Net {
 
             val requestBody = body.build()
 
-            val request = Request.Builder().url("https://$server/api/user/changeUsername")
+            val request = Request.Builder()
+                .url("https://$server/api/user/changeUsername")
                 .post(requestBody)
                 .addHeader("Authorization", "Bearer $token")
                 .addHeader("accept-language", language)
@@ -152,7 +152,8 @@ class Net {
 
             val requestBody = body.build()
 
-            val request = Request.Builder().url("https://$server/api/user/changePassword")
+            val request = Request.Builder()
+                .url("https://$server/api/user/changePassword")
                 .post(requestBody)
                 .addHeader("Authorization", "Bearer $token")
                 .addHeader("accept-language", language)
@@ -173,7 +174,8 @@ class Net {
 
             val requestBody = body.build()
 
-            val request = Request.Builder().url("https://$server/api/group/create/$name")
+            val request = Request.Builder()
+                .url("https://$server/api/group/create/$name")
                 .post(requestBody)
                 .addHeader("Authorization", "Bearer $token")
                 .addHeader("accept-language", language)
@@ -185,6 +187,28 @@ class Net {
         return changeGroupPassword(name, password)
     }
 
+    fun joinGroup(id: Int, password: String): Response {
+        lateinit var response: Response
+
+        thread {
+            val client = OkHttpClient()
+
+            val body = FormBody.Builder()
+                .add("password", password)
+                .build()
+
+            val request = Request.Builder()
+                .url("https://$server/api/group/join/$id")
+                .post(body)
+                .addHeader("Authorization", "Bearer $token")
+                .addHeader("accept-language", language)
+                .build()
+            response = client.newCall(request).execute()
+        }.join()
+
+        return response
+    }
+
     fun changeGroupPassword(name: String, password: String): Response {
         lateinit var response: Response
 
@@ -199,7 +223,8 @@ class Net {
 
             val requestBody = body.build()
 
-            val request = Request.Builder().url("https://$server/api/group/password/$groupId")
+            val request = Request.Builder()
+                .url("https://$server/api/group/password/$groupId")
                 .post(requestBody)
                 .addHeader("Authorization", "Bearer $token")
                 .addHeader("accept-language", language)
@@ -216,7 +241,8 @@ class Net {
         thread {
             val client = OkHttpClient()
 
-            val request = Request.Builder().url("https://$server/api/group/byName/$name")
+            val request = Request.Builder()
+                .url("https://$server/api/group/byName/$name")
                 .get()
                 .addHeader("Authorization", "Bearer $token")
                 .addHeader("accept-language", language)
@@ -228,4 +254,100 @@ class Net {
 
         return responseText
     }
+
+    fun getGroupName(id: Int) : String {
+        lateinit var response: Response
+
+        thread {
+            val client = OkHttpClient()
+
+            val request = Request.Builder()
+                .url("https://$server/api/group/byId/$id")
+                .get()
+                .addHeader("Authorization", "Bearer $token")
+                .addHeader("accept-language", language)
+                .build()
+            response = client.newCall(request).execute()
+        }.join()
+
+        val responseText = response.body!!.string()
+
+        return responseText
+    }
+
+    fun getUsersInGroup(groupId: Int): Response {
+        lateinit var response: Response
+
+        thread {
+            val client = OkHttpClient()
+
+            val request = Request.Builder()
+                .url("https://$server/api/group/getUsers/$groupId")
+                .get()
+                .addHeader("Authorization", "Bearer $token")
+                .addHeader("accept-language", language)
+                .build()
+
+            response = client.newCall(request).execute()
+        }.join()
+
+        return response
+    }
+
+    fun getMyGroups(): Response {
+        lateinit var response: Response
+
+        thread {
+            val client = OkHttpClient()
+
+            val request = Request.Builder()
+                .url("https://$server/api/user/myGroups")
+                .get()
+                .addHeader("Authorization", "Bearer $token")
+                .addHeader("accept-language", language)
+                .build()
+
+            response = client.newCall(request).execute()
+        }.join()
+
+        return response
+    }
+
+    fun getUsernameById(userId: Int): Response {
+        lateinit var response: Response
+
+        thread {
+            val client = OkHttpClient()
+
+            val request = Request.Builder()
+                .url("https://$server/api/user/byId/$userId")
+                .get()
+                .addHeader("Authorization", "Bearer $token")
+                .addHeader("accept-language", language)
+                .build()
+
+            response = client.newCall(request).execute()
+        }.join()
+
+        return response
+    }
+
+    fun getGroupAdminId(groupId: Int): Response {
+        lateinit var response: Response
+
+        thread {
+            val client = OkHttpClient()
+
+            val request = Request.Builder()
+                .url("https://$server/api/group/adminId/$groupId")
+                .get()
+                .addHeader("Authorization", "Bearer $token")
+                .addHeader("accept-language", language)
+                .build()
+
+            response = client.newCall(request).execute()
+        }.join()
+
+        return response
+    }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/Utils.kt

@@ -95,3 +95,7 @@ fun getUnitNameById (context: Context, id: Int): String {
         else -> { "" }
     }
 }
+
+fun parseArray(input: String): IntArray {
+    return input.trim('[', ']').split(",").map { it.trim().toInt() }.toIntArray()
+}

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/GroupActivity.kt

@@ -40,14 +40,43 @@ class GroupActivity : AppCompatActivity() {
 
             val response = n.createGroup(groupName, groupPassword)
             val responseText = response.body!!.string()
-            Toast.makeText(this, responseText, Toast.LENGTH_LONG).show()
 
             if (response.code == 200) {
-                Toast.makeText(this, responseText, Toast.LENGTH_LONG).show()
+                val currentGroups = sharedPreferences.getStringSet("groups", mutableSetOf())
-                sharedPreferences.edit().putStringSet("groups", setOf(responseText))
+                currentGroups!!.add(responseText)
+                sharedPreferences.edit().putStringSet("groups", currentGroups).apply()
+                sharedPreferences.edit().putString("currentGroup", responseText).apply()
                 val intent = Intent(this, MainActivity::class.java)
                 startActivity(intent)
                 finish()
+            } else {
+                Toast.makeText(this, responseText, Toast.LENGTH_LONG).show()
+            }
+        }
+
+        binding.joinGroupButton.setOnClickListener {
+            val groupName = binding.groupNameTextEdit.text.toString()
+            val groupPassword = binding.groupPasswordTextEdit.text.toString()
+
+            val n = Net()
+            n.language = sharedPreferences.getString("language", "en-US")!!
+            n.server = sharedPreferences.getString("server", "")!!
+            n.token = sharedPreferences.getString("token", "")!!
+
+            val groupId = n.getGroupId(groupName).toInt()
+            val response = n.joinGroup(groupId, groupPassword)
+            val responseText = response.body!!.string()
+
+            if (response.code == 200) {
+                val currentGroups = sharedPreferences.getStringSet("groups", mutableSetOf())
+                currentGroups!!.add(groupId.toString())
+                sharedPreferences.edit().putStringSet("groups", currentGroups).apply()
+                sharedPreferences.edit().putString("currentGroup", responseText).apply()
+                val intent = Intent(this, MainActivity::class.java)
+                startActivity(intent)
+                finish()
+            } else {
+                Toast.makeText(this, responseText, Toast.LENGTH_LONG).show()
             }
         }
     }

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/LoginActivity.kt

@@ -10,6 +10,8 @@ import androidx.security.crypto.MasterKeys
 import org.foxarmy.barcodescannerforemployees.Net
 import org.foxarmy.barcodescannerforemployees.R
 import org.foxarmy.barcodescannerforemployees.databinding.ActivityLoginBinding
+import org.foxarmy.barcodescannerforemployees.parseArray
+import org.json.JSONObject
 
 class LoginActivity : AppCompatActivity() {
 
@@ -49,8 +51,17 @@ class LoginActivity : AppCompatActivity() {
             if (response.code != 200) {
                 Toast.makeText(this, responseText, Toast.LENGTH_SHORT).show()
             } else {
-                sharedPreferences.edit().putString("token", responseText).apply()
+                val json = JSONObject(responseText)
-                sharedPreferences.edit().putString("servre", server).apply()
+                sharedPreferences.edit().putString("token", json["token"].toString()).apply()
+                n.token = json["token"].toString()
+                sharedPreferences.edit().putInt("userId", json["id"].toString().toInt()).apply()
+                sharedPreferences.edit().putString("server", server).apply()
+
+
+                val r = n.getMyGroups().body!!.string()
+                val myGroups = parseArray(r)
+
+                sharedPreferences.edit().putStringSet("groups", myGroups.map { a -> a.toString()}.toSet())
                 val intent = Intent(this, MainActivity::class.java)
                 startActivity(intent)
                 finish()
@@ -73,8 +84,9 @@ class LoginActivity : AppCompatActivity() {
             if (response.code != 200) {
                 Toast.makeText(this, responseText, Toast.LENGTH_SHORT).show();
             } else {
-                val token = n.login(username, password)
+                sharedPreferences.edit().putInt("userId", responseText.toInt()).apply()
-                sharedPreferences.edit().putString("token", token.body!!.string()).apply()
+                val token = JSONObject(n.login(username, password).body!!.string())["token"].toString()
+                sharedPreferences.edit().putString("token", token).apply()
 
                 sharedPreferences.edit().putString("server", server).apply()
                 val intent = Intent(this, GroupActivity::class.java)

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MainActivity.kt

@@ -118,7 +118,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
                 intent = Intent(this, AccountSettingsActivity::class.java)
             }
             R.id.nav_groups -> {
-                intent = Intent(this, AccountSettingsActivity::class.java)
+                intent = Intent(this, MyGroupsActivity::class.java)
             }
             R.id.nav_settings -> {
                 //TODO: Settings

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/ManageGroupActivity.kt

@@ -0,0 +1,78 @@
+package org.foxarmy.barcodescannerforemployees.activities
+
+import android.content.Context
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
+import org.foxarmy.barcodescannerforemployees.Net
+import org.foxarmy.barcodescannerforemployees.databinding.ActivityManageGroupBinding
+import org.foxarmy.barcodescannerforemployees.parseArray
+import org.foxarmy.barcodescannerforemployees.views.GroupMemberView
+
+class ManageGroupActivity : AppCompatActivity(){
+    private lateinit var binding: ActivityManageGroupBinding
+    private var isAdmin: Boolean = true
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        binding = ActivityManageGroupBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        val groupId = intent.extras!!.getInt("groupId")
+
+        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
+
+        val sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            masterKeyAlias,
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        val net = Net()
+
+        net.token = sharedPreferences.getString("token", "")!!
+        net.server = sharedPreferences.getString("server", "")!!
+        net.language = sharedPreferences.getString("language", "en-US")!!
+
+
+        val users = parseArray(net.getUsersInGroup(groupId).body!!.string())
+
+        for (user in users) {
+            val groupMemberView = GroupMemberView(this, this as Context, net.getUsernameById(user).body!!.string(), user)
+
+            binding.groupsContent.addView(groupMemberView)
+        }
+
+        isAdmin = amIAnAdminIn(groupId)
+
+        if (!isAdmin) {
+            binding.renameButton.visibility = View.GONE
+        }
+    }
+
+    fun amIAnAdminIn(groupId: Int): Boolean {
+        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
+
+        val sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            masterKeyAlias,
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        val net = Net()
+
+        net.token = sharedPreferences.getString("token", "")!!
+        net.server = sharedPreferences.getString("server", "")!!
+        net.language = sharedPreferences.getString("language", "en-US")!!
+
+        val result = sharedPreferences.getInt("userId", 0) == net.getGroupAdminId(groupId).body!!.string().toInt()
+        return result
+    }
+}

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MyGroupsActivity.kt

@@ -0,0 +1,57 @@
+package org.foxarmy.barcodescannerforemployees.activities
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.widget.LinearLayout
+import androidx.appcompat.app.AppCompatActivity
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
+import org.foxarmy.barcodescannerforemployees.Net
+import org.foxarmy.barcodescannerforemployees.R
+import org.foxarmy.barcodescannerforemployees.databinding.ActivityMyGroupsBinding
+import org.foxarmy.barcodescannerforemployees.parseArray
+import org.foxarmy.barcodescannerforemployees.views.GroupView
+
+class MyGroupsActivity : AppCompatActivity(){
+    private lateinit var binding: ActivityMyGroupsBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        binding = ActivityMyGroupsBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        val masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC)
+
+        val sharedPreferences = EncryptedSharedPreferences.create(
+            "sensitive",
+            masterKeyAlias,
+            applicationContext,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+        )
+
+        val net = Net()
+
+        net.token = sharedPreferences.getString("token", "")!!
+        net.server = sharedPreferences.getString("server", "")!!
+        net.language = sharedPreferences.getString("language", "en-US")!!
+
+        val groups = parseArray(net.getMyGroups().body!!.string())
+
+        val container = findViewById<LinearLayout>(R.id.groupsLayout)
+
+        for (group in groups) {
+            val groupView = GroupView(this, this as Context, net.getGroupName(group), group)
+
+
+            container.addView(groupView)
+        }
+
+        binding.newGroup.setOnClickListener {
+            val intent = Intent(this, GroupActivity::class.java)
+            startActivity(intent)
+        }
+    }
+}

app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/NavigatorActivity.kt

@@ -3,6 +3,7 @@ package org.foxarmy.barcodescannerforemployees.activities
 import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
+import android.util.Log
 import androidx.security.crypto.EncryptedSharedPreferences
 import androidx.security.crypto.MasterKeys
 
@@ -22,7 +23,7 @@ class NavigatorActivity : Activity() {
 
 
         startActivity(intent);
-//        finish();
+        finish();
     }
 
     private fun isAuthenticated(): Boolean {
@@ -52,6 +53,7 @@ class NavigatorActivity : Activity() {
         )
 
         val groups = sharedPreferences.getStringSet("groups", emptySet())
+        Log.d("QWERTYUIOP", groups.toString())
         return groups!!.isNotEmpty()
     }
 }

app/src/main/java/org/foxarmy/barcodescannerforemployees/views/GroupMemberView.kt

@@ -0,0 +1,25 @@
+package org.foxarmy.barcodescannerforemployees.views
+
+import android.app.Activity
+import android.content.Context
+import android.view.LayoutInflater
+import android.widget.LinearLayout
+import android.widget.TextView
+import org.foxarmy.barcodescannerforemployees.R
+
+class GroupMemberView : LinearLayout {
+
+    private var username: String
+    private var userId: Int
+
+    constructor(activity: Activity, context: Context, username: String, userId: Int) : super(context) {
+
+        this.username = username
+        this.userId = userId
+
+        val inflater: LayoutInflater = activity.layoutInflater
+        inflater.inflate(R.layout.group_member_view, this)
+
+        findViewById<TextView>(R.id.userNameTextView).text = username
+    }
+}

app/src/main/java/org/foxarmy/barcodescannerforemployees/views/GroupView.kt

@@ -0,0 +1,37 @@
+package org.foxarmy.barcodescannerforemployees.views
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.widget.LinearLayout
+import android.widget.TextView
+import androidx.core.content.ContextCompat
+import org.foxarmy.barcodescannerforemployees.R
+import org.foxarmy.barcodescannerforemployees.activities.ManageGroupActivity
+
+class GroupView : LinearLayout {
+    private var name: String
+    private var id: Int
+
+    constructor(activity: Activity, context: Context, name: String, id: Int) : super(context) {
+
+        this.name = name
+        this.id = id
+
+        val inflater: LayoutInflater = activity.layoutInflater
+        inflater.inflate(R.layout.group_view, this)
+
+        findViewById<TextView>(R.id.nameTextView).text = name
+
+        setOnClickListener {
+            val intent = Intent(activity, ManageGroupActivity::class.java)
+            val extras = Bundle()
+            extras.putInt("groupId", id)
+            intent.putExtras(extras)
+            ContextCompat.startActivity(context, intent, extras)
+        }
+    }
+
+}

app/src/main/res/layout/activity_manage_group.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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" android:layout_width="match_parent"
+                                                   android:layout_height="match_parent">
+
+    <Button
+            android:text="@string/leave_group"
+            android:layout_width="91dp"
+            android:layout_height="wrap_content" android:id="@+id/leaveButton"
+            app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="12dp"
+            app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="48dp"
+            app:layout_constraintEnd_toStartOf="@+id/renameButton" android:layout_marginEnd="12dp"/>
+    <Button
+            android:text="@string/rename_group"
+            android:layout_width="91dp"
+            android:layout_height="wrap_content" android:id="@+id/renameButton"
+            app:layout_constraintTop_toTopOf="parent"
+            android:layout_marginTop="48dp"
+            app:layout_constraintStart_toEndOf="@+id/leaveButton" app:layout_constraintEnd_toStartOf="@+id/button3"
+            android:visibility="visible"/>
+    <Button
+            android:text="Button"
+            android:layout_width="91dp"
+            android:layout_height="wrap_content" android:id="@+id/button3"
+            app:layout_constraintTop_toTopOf="parent"
+            android:layout_marginTop="48dp"
+            app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="12dp"
+            app:layout_constraintStart_toEndOf="@+id/renameButton" android:visibility="gone"
+            android:layout_marginStart="12dp"/>
+    <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" app:layout_constraintTop_toBottomOf="@+id/leaveButton"
+            android:layout_marginTop="48dp" android:id="@+id/membersScrollView">
+        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"
+                      android:orientation="vertical" android:id="@+id/groupsContent"/>
+    </ScrollView>
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_my_groups.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 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" android:layout_width="match_parent"
+                                                   android:layout_height="match_parent">
+
+    <Button
+            android:text="@string/join_or_create_group"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" android:id="@+id/newGroup"
+            app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="24dp"/>
+    <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" android:id="@+id/groupsContent"
+            app:layout_constraintTop_toBottomOf="@+id/newGroup" android:layout_marginTop="16dp">
+        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"
+                      android:orientation="vertical" android:id="@+id/groupsLayout"/>
+    </ScrollView>
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/group_member_view.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="horizontal"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+
+    <TextView
+            android:text="User"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" android:id="@+id/userNameTextView" android:layout_weight="1"
+            android:textSize="30sp"/>
+</LinearLayout>

app/src/main/res/layout/group_view.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+
+    <TextView
+            android:text="Group"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" android:id="@+id/nameTextView" android:textSize="30sp"/>
+</LinearLayout>

app/src/main/res/values-ru/strings.xml

@@ -107,6 +107,10 @@
     <string name="group_password">Group password</string>
     <string name="create_group">Create group</string>
     <string name="join_group">Join group</string>
+    <string name="leave">Leave</string>
+    <string name="leave_group">Leave group</string>
+    <string name="rename_group">Rename group</string>
+    <string name="join_or_create_group">Join or create a group</string>
     <string-array name="languages">
         <item>en-US</item>
         <item>ru-RU</item>

app/src/main/res/values/strings.xml

@@ -105,6 +105,10 @@
     <string name="group_password">Group password</string>
     <string name="create_group">Create group</string>
     <string name="join_group">Join group</string>
+    <string name="leave">Leave</string>
+    <string name="leave_group">Leave group</string>
+    <string name="rename_group">Rename group</string>
+    <string name="join_or_create_group">Join or create a group</string>
     <string-array name="languages">
         <item>en-US</item>
         <item>ru-RU</item>