Fix a startup flicker on Android M

app/src/main/java/org/solovyev/android/calculator/Preferences.java

@@ -29,11 +29,14 @@ import android.content.SharedPreferences;
 import android.content.res.TypedArray;
 import android.graphics.Color;
 import android.provider.Settings;
-import android.support.annotation.*;
+import android.support.annotation.ColorRes;
+import android.support.annotation.LayoutRes;
+import android.support.annotation.NonNull;
+import android.support.annotation.StringRes;
+import android.support.annotation.StyleRes;
 import android.support.v7.view.ContextThemeWrapper;
 import android.util.SparseArray;
-import jscl.AngleUnit;
+
-import jscl.NumeralBase;
 import org.solovyev.android.Check;
 import org.solovyev.android.calculator.about.AboutActivity;
 import org.solovyev.android.calculator.functions.FunctionsActivity;
@@ -44,15 +47,23 @@ import org.solovyev.android.calculator.operators.OperatorsActivity;
 import org.solovyev.android.calculator.preferences.PreferencesActivity;
 import org.solovyev.android.calculator.variables.VariablesActivity;
 import org.solovyev.android.calculator.wizard.WizardActivity;
-import org.solovyev.android.prefs.*;
+import org.solovyev.android.prefs.BooleanPreference;
+import org.solovyev.android.prefs.IntegerPreference;
+import org.solovyev.android.prefs.NumberToStringPreference;
+import org.solovyev.android.prefs.Preference;
+import org.solovyev.android.prefs.StringPreference;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.text.DecimalFormatSymbols;
 import java.util.EnumMap;
 import java.util.Locale;
 import java.util.Map;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.AngleUnit;
+import jscl.NumeralBase;
+
 import static org.solovyev.android.prefs.IntegerPreference.DEF_VALUE;
 
 public final class Preferences {
@@ -301,7 +312,7 @@ public final class Preferences {
             metro_purple_theme(R.string.p_metro_purple_theme, R.style.Cpp_Theme_Metro_Purple, R.style.Cpp_Theme_Metro_Purple_Calculator, R.style.Cpp_Theme_Wizard, R.style.Cpp_Theme_Metro_Purple_Dialog, R.style.Cpp_Theme_Material_Dialog_Alert),
             metro_green_theme(R.string.p_metro_green_theme, R.style.Cpp_Theme_Metro_Green, R.style.Cpp_Theme_Metro_Green_Calculator, R.style.Cpp_Theme_Wizard, R.style.Cpp_Theme_Metro_Green_Dialog, R.style.Cpp_Theme_Material_Dialog_Alert),
             material_theme(R.string.cpp_theme_dark, R.style.Cpp_Theme_Material, R.style.Cpp_Theme_Material_Calculator),
-            material_light_theme(R.string.cpp_theme_light, R.style.Cpp_Theme_Material_Light, R.style.Cpp_Theme_Material_Light, R.style.Cpp_Theme_Wizard_Light, R.style.Cpp_Theme_Material_Light_Dialog, R.style.Cpp_Theme_Material_Light_Dialog_Alert);
+            material_light_theme(R.string.cpp_theme_light, R.style.Cpp_Theme_Material_Light, R.style.Cpp_Theme_Material_Light_Calculator, R.style.Cpp_Theme_Wizard_Light, R.style.Cpp_Theme_Material_Light_Dialog, R.style.Cpp_Theme_Material_Light_Dialog_Alert);
 
             private static final SparseArray<TextColor> textColors = new SparseArray<>();
 

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

@@ -24,6 +24,7 @@
 
     <style name="Cpp.Theme.Calculator" parent="@style/Cpp.Theme">
         <item name="android:windowBackground">@color/cpp_editor_bg</item>
+        <item name="android:windowAnimationStyle">@null</item>
     </style>
 
     <style name="Cpp.Theme" parent="@style/Theme.AppCompat.NoActionBar">

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

@@ -78,6 +78,7 @@
 
     <style name="Cpp.Theme.Material.Calculator" parent="Cpp.Theme.Material">
         <item name="android:windowBackground">@color/cpp_editor_bg</item>
+        <item name="android:windowAnimationStyle">@null</item>
     </style>
 
     <style name="Cpp.Theme.Material" parent="Cpp.Theme">

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

@@ -102,4 +102,9 @@
         <item name="cpp_button_style_operation_highlighted">@style/CppKeyboardButton.Material.Light.Operation.Highlighted</item>
     </style>
 
+    <style name="Cpp.Theme.Material.Light.Calculator" parent="Cpp.Theme.Material.Light">
+        <item name="android:windowBackground">@color/cpp_bg_light</item>
+        <item name="android:windowAnimationStyle">@null</item>
+    </style>
+
 </resources>

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

@@ -92,6 +92,7 @@
 
     <style name="Cpp.Theme.Metro.Blue.Calculator" parent="Cpp.Theme.Metro.Blue">
         <item name="android:windowBackground">@color/cpp_editor_bg</item>
+        <item name="android:windowAnimationStyle">@null</item>
     </style>
 
 </resources>

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

@@ -40,6 +40,7 @@
 
     <style name="Cpp.Theme.Metro.Green.Calculator" parent="Cpp.Theme.Metro.Green">
         <item name="android:windowBackground">@color/cpp_editor_bg</item>
+        <item name="android:windowAnimationStyle">@null</item>
     </style>
 
 </resources>

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

@@ -40,6 +40,7 @@
 
     <style name="Cpp.Theme.Metro.Purple.Calculator" parent="Cpp.Theme.Metro.Purple">
         <item name="android:windowBackground">@color/cpp_editor_bg</item>
+        <item name="android:windowAnimationStyle">@null</item>
     </style>
 
 </resources>