add dark theme to PassphrasePromptActivity

Fixes #2296

Closes #2307
Closes #2627

res/layout/centered_app_title.xml

@@ -10,7 +10,7 @@
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:text="@string/app_name"
-        android:textColor="#55000000"
+        android:textColor="?attr/centered_app_title_color"
         android:fontFamily="sans-serif-light"
         android:id="@+id/title"
         android:textSize="23sp" />

res/layout/create_passphrase_activity.xml

@@ -16,7 +16,7 @@
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_marginBottom="20dp"
-               android:src="@drawable/lockscreen_watermark"
+               android:src="@drawable/lockscreen_watermark_light"
                android:contentDescription="@string/PassphrasePromptActivity_watermark_content_description"
                android:layout_marginTop="100dp"/>
 

res/layout/prompt_passphrase_activity.xml

@@ -15,7 +15,7 @@
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    android:layout_marginBottom="50dp"
-                   android:src="@drawable/lockscreen_watermark"
+                   android:src="?lockscreen_watermark"
                    android:contentDescription="@string/PassphrasePromptActivity_watermark_content_description"
                    android:layout_marginTop="30dp"/>
 
@@ -35,7 +35,7 @@
                       android:paddingRight="10dp"/>
 
             <ImageButton android:id="@+id/ok_button"
-                         android:src="@drawable/ic_action_forward"
+                         android:src="?ic_arrow_forward"
                          android:contentDescription="@string/PassphrasePromptActivity_ok_button_content_description"
                          android:background="@null"
                          android:text="@string/prompt_passphrase_activity__unlock"

res/values/attrs.xml

@@ -23,6 +23,9 @@
     <attr name="fab_color" format="reference|color" />
     <attr name="lower_right_divet" format="reference" />
 
+    <attr name="centered_app_title_color" format="reference|color" />
+    <attr name="ic_arrow_forward" format="reference" />
+
     <attr name="conversation_background" format="reference|color"/>
     <attr name="conversation_editor_background" format="reference"/>
     <attr name="conversation_editor_text_color" format="reference|color"/>
@@ -113,4 +116,5 @@
     </declare-styleable>
 
     <attr name="group_members_dialog_icon" format="reference"/>
+    <attr name="lockscreen_watermark" format="reference" />
 </resources>

res/values/themes.xml

@@ -1,9 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources xmlns:tools="http://schemas.android.com/tools">
-    <style name="TextSecure.IntroTheme" parent="@style/Theme.AppCompat.Light">
+    <style name="TextSecure.LightIntroTheme" parent="@style/Theme.AppCompat.Light">
         <!--<item name="colorPrimary">@android:color/transparent</item>-->
         <item name="actionBarStyle">@style/TextSecure.IntroActionBar</item>
         <item name="android:windowContentOverlay">@null</item>
+
+        <item name="android:textColorHint">#cc000000</item>
+        <item name="centered_app_title_color">#55000000</item>
+        <item name="ic_arrow_forward">@drawable/ic_arrow_forward_light</item>
+        <item name="lockscreen_watermark">@drawable/lockscreen_watermark_light</item>
+    </style>
+
+    <style name="TextSecure.DarkIntroTheme" parent="@style/Theme.AppCompat">
+        <item name="actionBarStyle">@style/TextSecure.IntroActionBar</item>
+        <item name="android:windowContentOverlay">@null</item>
+
+        <item name="android:textColorHint">@color/white</item>
+        <item name="centered_app_title_color">@color/gray27</item>
+        <item name="ic_arrow_forward">@drawable/ic_arrow_forward_dark</item>
+        <item name="lockscreen_watermark">@drawable/lockscreen_watermark_dark</item>
+        <item name="android:windowBackground">@color/black</item>
     </style>
 
     <style name="TextSecure.LightTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">