Introduce ProgressDialog

res/layout/dialog_progress.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout 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:id="@+id/frg_background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#80000000"
+    android:elevation="1dp">
+
+    <LinearLayout
+        android:id="@+id/frg_body"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_centerHorizontal="true"
+        android:layout_marginBottom="20dp"
+        android:background="@drawable/rounded_rect"
+        android:backgroundTint="#1E1E2E"
+        android:divider="@drawable/divider"
+        android:gravity="center"
+        android:minWidth="200dp"
+        android:orientation="vertical"
+        android:showDividers="middle">
+
+        <TextView
+            android:id="@+id/title"
+            style="@style/settings_tab_divider"
+            android:paddingVertical="12dp"
+            android:text="Title" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:orientation="horizontal"
+            android:padding="12dp">
+
+            <com.google.android.material.progressindicator.CircularProgressIndicator
+                android:id="@+id/progress"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:indeterminate="true"
+                android:padding="10dp"
+                app:indicatorColor="@color/colorAccent"
+                app:indicatorDirectionCircular="counterclockwise"
+                app:trackCornerRadius="12dp"
+                tools:indeterminate="false"
+                tools:progress="50" />
+
+            <TextView
+                android:id="@+id/message"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginHorizontal="12dp"
+                android:maxWidth="400dp"
+                android:textColor="#FFF"
+                tools:text="Message" />
+
+        </LinearLayout>
+
+    </LinearLayout>
+
+</RelativeLayout>

src/com/reco1l/osu/ui/ProgressDialog.kt

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+package com.reco1l.osu.ui
+
+import com.google.android.material.progressindicator.CircularProgressIndicator
+import ru.nsu.ccfit.zuev.osuplus.R
+
+
+class ProgressDialog : MessageDialog() {
+
+
+    override val layoutID = R.layout.dialog_progress
+
+
+    /**
+     * The progress of the dialog.
+     */
+    var progress: Int = 0
+        set(value) {
+            field = value
+            if (isCreated) {
+                findViewById<CircularProgressIndicator>(R.id.progress)!!.progress = value
+            }
+        }
+
+    /**
+     * Whether the progress is indeterminate or not.
+     */
+    var indeterminate: Boolean = false
+        set(value) {
+            field = value
+            if (isCreated) {
+                findViewById<CircularProgressIndicator>(R.id.progress)!!.isIndeterminate = value
+            }
+        }
+
+    /**
+     * The maximum value of the progress.
+     */
+    var max: Int = 0
+        set(value) {
+            field = value
+            if (isCreated) {
+                findViewById<CircularProgressIndicator>(R.id.progress)!!.max = value
+            }
+        }
+
+
+    override fun onLoadView() {
+        super.onLoadView()
+
+        max = max
+        progress = progress
+        indeterminate = indeterminate
+    }
+
+
+    /**
+     * Sets the progress of the dialog.
+     */
+    fun setProgress(value: Int): ProgressDialog {
+        progress = value
+        return this
+    }
+
+    /**
+     * Sets whether the progress is indeterminate or not.
+     */
+    fun setIndeterminate(value: Boolean): ProgressDialog {
+        indeterminate = value
+        return this
+    }
+
+    /**
+     * Sets the maximum value of the progress.
+     */
+    fun setMax(value: Int): ProgressDialog {
+        max = value
+        return this
+    }
+
+}