Stop using ProgressDialog, there is a theme issue with it.

It's not maintain by Google since it's deprecated. Force usage of MaterialAlertDialogBuilder to have the same UI effect. We sometimes need to block the UI :/

library/ui-styles/src/debug/java/im/vector/lib/ui/styles/debug/DebugMaterialThemeActivity.kt

@@ -24,6 +24,7 @@ import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.snackbar.Snackbar
 import im.vector.lib.ui.styles.R
 import im.vector.lib.ui.styles.databinding.ActivityDebugMaterialThemeBinding
+import im.vector.lib.ui.styles.dialogs.MaterialProgressDialog
 
 // Rendering is not the same with VectorBaseActivity
 abstract class DebugMaterialThemeActivity : AppCompatActivity() {
@@ -61,6 +62,11 @@ abstract class DebugMaterialThemeActivity : AppCompatActivity() {
             showTestDialog(R.style.ThemeOverlay_Vector_MaterialAlertDialog_NegativeDestructive)
         }
 
+        views.debugShowProgressDialog.setOnClickListener {
+            MaterialProgressDialog(this)
+                    .show(message = "Progress Dialog\nLine 2", cancellable = true)
+        }
+
         views.debugShowBottomSheet.setOnClickListener {
             DebugBottomSheet().show(supportFragmentManager, "TAG")
         }

library/ui-styles/src/debug/res/layout/activity_debug_material_theme.xml

@@ -466,6 +466,13 @@
                     android:layout_gravity="center_horizontal"
                     android:text="Show Dialog Neg Destructive" />
 
+                <Button
+                    android:id="@+id/debugShowProgressDialog"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center_horizontal"
+                    android:text="Show Progress Dialog" />
+
                 <Button
                     android:id="@+id/debugShowBottomSheet"
                     android:layout_width="wrap_content"

library/ui-styles/src/main/java/MaterialProgressDialog.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021 New Vector Ltd
+ *
+ * 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.
+ */
+
+package im.vector.lib.ui.styles.dialogs
+
+import android.content.Context
+import android.view.LayoutInflater
+import androidx.appcompat.app.AlertDialog
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import im.vector.lib.ui.styles.R
+import im.vector.lib.ui.styles.databinding.DialogProgressMaterialBinding
+
+class MaterialProgressDialog(val context: Context) {
+    fun show(message: CharSequence, cancellable: Boolean = false): AlertDialog {
+        val view = LayoutInflater.from(context).inflate(R.layout.dialog_progress_material, null)
+        val views = DialogProgressMaterialBinding.bind(view)
+        views.message.text = message
+
+        return MaterialAlertDialogBuilder(context)
+                .setCancelable(cancellable)
+                .setView(view)
+                .show()
+    }
+}

library/ui-styles/src/main/res/layout/dialog_progress_material.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <!-- Inspired from https://android.googlesource.com/platform/frameworks/base/+/master/core/res/res/layout/progress_dialog.xml -->
+    <LinearLayout
+        android:id="@+id/body"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:baselineAligned="false"
+        android:orientation="horizontal"
+        android:paddingStart="8dp"
+        android:paddingTop="10dp"
+        android:paddingEnd="8dp"
+        android:paddingBottom="10dp">
+
+        <ProgressBar
+            android:id="@android:id/progress"
+            style="?android:attr/progressBarStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="12dp"
+            android:max="10000" />
+
+        <TextView
+            android:id="@+id/message"
+            style="@style/Widget.Vector.TextView.Body"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            tools:text="Content\nLine 2" />
+
+    </LinearLayout>
+
+</FrameLayout>

vector/src/main/java/im/vector/app/core/platform/VectorBaseFragment.kt

@@ -14,11 +14,8 @@
  * limitations under the License.
  */
 
-@file:Suppress("DEPRECATION")
-
 package im.vector.app.core.platform
 
-import android.app.ProgressDialog
 import android.content.Context
 import android.os.Bundle
 import android.os.Parcelable
@@ -29,11 +26,12 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.annotation.CallSuper
 import androidx.annotation.MainThread
-import com.google.android.material.appbar.MaterialToolbar
+import androidx.appcompat.app.AlertDialog
 import androidx.lifecycle.ViewModelProvider
 import androidx.viewbinding.ViewBinding
 import com.airbnb.mvrx.BaseMvRxFragment
 import com.bumptech.glide.util.Util.assertMainThread
+import com.google.android.material.appbar.MaterialToolbar
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.jakewharton.rxbinding3.view.clicks
 import im.vector.app.R
@@ -44,14 +42,14 @@ import im.vector.app.core.dialogs.UnrecognizedCertificateDialog
 import im.vector.app.core.error.ErrorFormatter
 import im.vector.app.core.extensions.toMvRxBundle
 import im.vector.app.features.navigation.Navigator
+import im.vector.lib.ui.styles.dialogs.MaterialProgressDialog
 import io.reactivex.android.schedulers.AndroidSchedulers
 import io.reactivex.disposables.CompositeDisposable
 import io.reactivex.disposables.Disposable
-
 import timber.log.Timber
 import java.util.concurrent.TimeUnit
 
-abstract class VectorBaseFragment<VB: ViewBinding> : BaseMvRxFragment(), HasScreenInjector {
+abstract class VectorBaseFragment<VB : ViewBinding> : BaseMvRxFragment(), HasScreenInjector {
 
     protected val vectorBaseActivity: VectorBaseActivity<*> by lazy {
         activity as VectorBaseActivity<*>
@@ -67,7 +65,7 @@ abstract class VectorBaseFragment<VB: ViewBinding> : BaseMvRxFragment(), HasScre
     protected lateinit var errorFormatter: ErrorFormatter
     protected lateinit var unrecognizedCertificateDialog: UnrecognizedCertificateDialog
 
-    private var progress: ProgressDialog? = null
+    private var progress: AlertDialog? = null
 
     /* ==========================================================================================
      * View model
@@ -203,14 +201,10 @@ abstract class VectorBaseFragment<VB: ViewBinding> : BaseMvRxFragment(), HasScre
         vectorBaseActivity.getCoordinatorLayout()?.showOptimizedSnackbar(errorFormatter.toHumanReadable(throwable))
     }
 
-    protected fun showLoadingDialog(message: CharSequence? = null, cancelable: Boolean = false) {
+    protected fun showLoadingDialog(message: CharSequence? = null) {
         progress?.dismiss()
-        progress = ProgressDialog(requireContext()).apply {
-            setCancelable(cancelable)
-            setMessage(message ?: getString(R.string.please_wait))
-            setProgressStyle(ProgressDialog.STYLE_SPINNER)
-            show()
-        }
+        progress = MaterialProgressDialog(requireContext())
+                .show(message ?: getString(R.string.please_wait))
     }
 
     protected fun dismissLoadingDialog() {