rsend: push phone folders to a home SSH host over rsync

A small Android app for one-way folder backup, a KISS alternative to
Syncthing. It bundles rsync (built from pinned source via the NDK) and
a pure-Go SSH transport, both shipped in the APK as lib*.so and run from
the native library directory.

rsend pins the host key, stores the ed25519 identity Keystore-encrypted,
pushes each folder additively or as a mirror, and runs on demand or on a
WiFi-only schedule. The build is self-contained and reproducible: make
setup provisions the toolchain, make builds rsync, rsh, and the APK.

4 files changed, 139 insertions, 0 deletions

diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..bfcdd4e
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Neutral / monochrome palette. Light mode; values-night overrides. -->
+    <color name="background">#F4F4F5</color>
+    <color name="surface">#FFFFFF</color>
+    <color name="surface_variant">#ECECEE</color>
+    <color name="outline">#DCDCE0</color>
+    <color name="text_primary">#17181A</color>
+    <color name="text_secondary">#6A6C70</color>
+
+    <!-- Single restrained accent: a quiet slate. Drives switches and focus. -->
+    <color name="accent">#3B4252</color>
+
+    <!-- Primary button flips so it always has contrast against the surface. -->
+    <color name="button_primary_bg">#23252B</color>
+    <color name="button_primary_text">#FFFFFF</color>
+
+    <!-- Action bar / status bar. -->
+    <color name="bar">#23252B</color>
+</resources>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..abcba37
--- /dev/null
+++ b/app/src/main/res/values/dimens.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="space_s">8dp</dimen>
+    <dimen name="space_m">16dp</dimen>
+    <dimen name="space_l">24dp</dimen>
+
+    <dimen name="radius">14dp</dimen>
+    <dimen name="radius_pill">999dp</dimen>
+
+    <dimen name="card_padding">16dp</dimen>
+    <dimen name="row_min_height">56dp</dimen>
+    <dimen name="stroke">1dp</dimen>
+</resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..1f1e4bb
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">rsend</string>
+</resources>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..c31d4d8
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,103 @@
+<resources>
+
+    <style name="Theme.Rsend" parent="Theme.AppCompat.DayNight.NoActionBar">
+        <item name="colorPrimary">@color/bar</item>
+        <item name="colorPrimaryDark">@color/bar</item>
+        <item name="colorAccent">@color/accent</item>
+        <item name="colorControlActivated">@color/accent</item>
+        <item name="android:windowBackground">@color/background</item>
+        <item name="android:colorBackground">@color/background</item>
+        <item name="android:textColorPrimary">@color/text_primary</item>
+        <item name="android:textColorSecondary">@color/text_secondary</item>
+        <item name="android:textColorHint">@color/text_secondary</item>
+    </style>
+
+    <!-- Text -->
+    <style name="TextAppearance.Rsend.Title" parent="TextAppearance.AppCompat">
+        <item name="android:textColor">@color/text_primary</item>
+        <item name="android:textSize">17sp</item>
+        <item name="android:textStyle">bold</item>
+    </style>
+
+    <style name="TextAppearance.Rsend.SectionHeader" parent="TextAppearance.AppCompat">
+        <item name="android:textColor">@color/text_secondary</item>
+        <item name="android:textSize">12sp</item>
+        <item name="android:textStyle">bold</item>
+        <item name="android:textAllCaps">true</item>
+        <item name="android:letterSpacing">0.08</item>
+    </style>
+
+    <style name="TextAppearance.Rsend.Body" parent="TextAppearance.AppCompat">
+        <item name="android:textColor">@color/text_primary</item>
+        <item name="android:textSize">15sp</item>
+    </style>
+
+    <style name="TextAppearance.Rsend.Caption" parent="TextAppearance.AppCompat">
+        <item name="android:textColor">@color/text_secondary</item>
+        <item name="android:textSize">13sp</item>
+    </style>
+
+    <style name="TextAppearance.Rsend.Mono" parent="TextAppearance.AppCompat">
+        <item name="android:textColor">@color/text_primary</item>
+        <item name="android:fontFamily">monospace</item>
+        <item name="android:textSize">12sp</item>
+    </style>
+
+    <!-- Containers -->
+    <style name="Widget.Rsend.Card" parent="">
+        <item name="android:background">@drawable/bg_card</item>
+        <item name="android:padding">@dimen/card_padding</item>
+        <item name="android:layout_marginBottom">@dimen/space_m</item>
+    </style>
+
+    <style name="Widget.Rsend.Row" parent="">
+        <item name="android:orientation">horizontal</item>
+        <item name="android:gravity">center_vertical</item>
+        <item name="android:minHeight">@dimen/row_min_height</item>
+        <item name="android:background">?attr/selectableItemBackground</item>
+        <item name="android:paddingTop">@dimen/space_s</item>
+        <item name="android:paddingBottom">@dimen/space_s</item>
+    </style>
+
+    <!-- Buttons -->
+    <style name="Widget.Rsend.Button.Primary" parent="Widget.AppCompat.Button">
+        <item name="android:background">@drawable/bg_button_primary</item>
+        <item name="android:textColor">@color/button_primary_text</item>
+        <item name="android:textAllCaps">false</item>
+        <item name="android:textStyle">bold</item>
+        <item name="android:textSize">15sp</item>
+        <item name="android:minHeight">52dp</item>
+        <item name="android:stateListAnimator">@null</item>
+    </style>
+
+    <style name="Widget.Rsend.Button.Secondary" parent="Widget.AppCompat.Button">
+        <item name="android:background">@drawable/bg_button_secondary</item>
+        <item name="android:textColor">@color/text_primary</item>
+        <item name="android:textAllCaps">false</item>
+        <item name="android:textSize">15sp</item>
+        <item name="android:minHeight">48dp</item>
+        <item name="android:stateListAnimator">@null</item>
+    </style>
+
+    <!-- Inputs -->
+    <style name="Widget.Rsend.EditText" parent="Widget.AppCompat.EditText">
+        <item name="android:background">@drawable/bg_input</item>
+        <item name="android:textColor">@color/text_primary</item>
+        <item name="android:textColorHint">@color/text_secondary</item>
+        <item name="android:padding">12dp</item>
+        <item name="android:textSize">15sp</item>
+    </style>
+
+    <!-- Chip (per-folder add/mirror tag) -->
+    <style name="Widget.Rsend.Chip" parent="">
+        <item name="android:background">@drawable/bg_chip</item>
+        <item name="android:textColor">@color/text_secondary</item>
+        <item name="android:textSize">11sp</item>
+        <item name="android:textAllCaps">true</item>
+        <item name="android:paddingLeft">10dp</item>
+        <item name="android:paddingRight">10dp</item>
+        <item name="android:paddingTop">3dp</item>
+        <item name="android:paddingBottom">3dp</item>
+    </style>
+
+</resources>