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.

15 files changed, 159 insertions, 0 deletions

diff --git a/app/src/main/res/drawable/bg_button_primary.xml b/app/src/main/res/drawable/bg_button_primary.xml
new file mode 100644
index 0000000..c2a22f5
--- /dev/null
+++ b/app/src/main/res/drawable/bg_button_primary.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="#33FFFFFF">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@color/button_primary_bg" />
+            <corners android:radius="@dimen/radius" />
+        </shape>
+    </item>
+</ripple>
diff --git a/app/src/main/res/drawable/bg_button_secondary.xml b/app/src/main/res/drawable/bg_button_secondary.xml
new file mode 100644
index 0000000..93c7ccd
--- /dev/null
+++ b/app/src/main/res/drawable/bg_button_secondary.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="@color/surface_variant">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@color/surface" />
+            <corners android:radius="@dimen/radius" />
+            <stroke
+                android:width="@dimen/stroke"
+                android:color="@color/outline" />
+        </shape>
+    </item>
+</ripple>
diff --git a/app/src/main/res/drawable/bg_card.xml b/app/src/main/res/drawable/bg_card.xml
new file mode 100644
index 0000000..0971d54
--- /dev/null
+++ b/app/src/main/res/drawable/bg_card.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/surface" />
+    <corners android:radius="@dimen/radius" />
+    <stroke
+        android:width="@dimen/stroke"
+        android:color="@color/outline" />
+</shape>
diff --git a/app/src/main/res/drawable/bg_chip.xml b/app/src/main/res/drawable/bg_chip.xml
new file mode 100644
index 0000000..aecffef
--- /dev/null
+++ b/app/src/main/res/drawable/bg_chip.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/surface_variant" />
+    <corners android:radius="@dimen/radius_pill" />
+</shape>
diff --git a/app/src/main/res/drawable/bg_input.xml b/app/src/main/res/drawable/bg_input.xml
new file mode 100644
index 0000000..b87f6b3
--- /dev/null
+++ b/app/src/main/res/drawable/bg_input.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_focused="true">
+        <shape android:shape="rectangle">
+            <solid android:color="@color/surface" />
+            <corners android:radius="@dimen/radius" />
+            <stroke
+                android:width="2dp"
+                android:color="@color/accent" />
+        </shape>
+    </item>
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@color/surface" />
+            <corners android:radius="@dimen/radius" />
+            <stroke
+                android:width="@dimen/stroke"
+                android:color="@color/outline" />
+        </shape>
+    </item>
+</selector>
diff --git a/app/src/main/res/drawable/dot_off.xml b/app/src/main/res/drawable/dot_off.xml
new file mode 100644
index 0000000..3115ccc
--- /dev/null
+++ b/app/src/main/res/drawable/dot_off.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@android:color/transparent" />
+    <stroke
+        android:width="2dp"
+        android:color="@color/text_secondary" />
+    <size
+        android:width="10dp"
+        android:height="10dp" />
+</shape>
diff --git a/app/src/main/res/drawable/dot_on.xml b/app/src/main/res/drawable/dot_on.xml
new file mode 100644
index 0000000..396b841
--- /dev/null
+++ b/app/src/main/res/drawable/dot_on.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@color/accent" />
+    <size
+        android:width="10dp"
+        android:height="10dp" />
+</shape>
diff --git a/app/src/main/res/drawable/ic_chevron.xml b/app/src/main/res/drawable/ic_chevron.xml
new file mode 100644
index 0000000..4c416de
--- /dev/null
+++ b/app/src/main/res/drawable/ic_chevron.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@color/text_secondary"
+        android:pathData="M10,6L8.59,7.41 13.17,12l-4.58,4.59L10,18l6,-6z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_folder.xml b/app/src/main/res/drawable/ic_folder.xml
new file mode 100644
index 0000000..b5b85f9
--- /dev/null
+++ b/app/src/main/res/drawable/ic_folder.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@color/text_secondary"
+        android:pathData="M10,4H4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V8c0,-1.1 -0.9,-2 -2,-2h-8l-2,-2z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_key.xml b/app/src/main/res/drawable/ic_key.xml
new file mode 100644
index 0000000..1d905df
--- /dev/null
+++ b/app/src/main/res/drawable/ic_key.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@color/text_secondary"
+        android:pathData="M12.65,10C11.83,7.67 9.61,6 7,6c-3.31,0 -6,2.69 -6,6s2.69,6 6,6c2.61,0 4.83,-1.67 5.65,-4H17v4h4v-4h2v-4H12.65zM7,14c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000..c468735
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#23252B"
+        android:pathData="M0,0h108v108h-108z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_launcher_foreground.xml b/app/src/main/res/drawable/ic_launcher_foreground.xml
new file mode 100644
index 0000000..ff1dc35
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_foreground.xml
@@ -0,0 +1,14 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <!-- Checkmark inside the 72dp adaptive-icon safe zone. -->
+    <path
+        android:strokeColor="#FFFFFF"
+        android:strokeWidth="9"
+        android:strokeLineCap="round"
+        android:strokeLineJoin="round"
+        android:fillColor="#00000000"
+        android:pathData="M38,55 L49,67 L72,40" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_notification.xml b/app/src/main/res/drawable/ic_notification.xml
new file mode 100644
index 0000000..b4309dd
--- /dev/null
+++ b/app/src/main/res/drawable/ic_notification.xml
@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <!-- White silhouette; the system tints status-bar icons by alpha. -->
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M9,16.17L4.83,12l-1.42,1.41L9,19 21,7l-1.41,-1.41z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_remote.xml b/app/src/main/res/drawable/ic_remote.xml
new file mode 100644
index 0000000..c81a049
--- /dev/null
+++ b/app/src/main/res/drawable/ic_remote.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@color/text_secondary"
+        android:pathData="M19,15H5c-1.1,0 -2,0.9 -2,2v2c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2v-2c0,-1.1 -0.9,-2 -2,-2zM7,19c-0.55,0 -1,-0.45 -1,-1s0.45,-1 1,-1 1,0.45 1,1 -0.45,1 -1,1zM19,3H5c-1.1,0 -2,0.9 -2,2v2c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2V5c0,-1.1 -0.9,-2 -2,-2zM7,7C6.45,7 6,6.55 6,6s0.45,-1 1,-1 1,0.45 1,1 -0.45,1 -1,1z" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_schedule.xml b/app/src/main/res/drawable/ic_schedule.xml
new file mode 100644
index 0000000..e125104
--- /dev/null
+++ b/app/src/main/res/drawable/ic_schedule.xml
@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@color/text_secondary"
+        android:pathData="M11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z" />
+    <path
+        android:fillColor="@color/text_secondary"
+        android:pathData="M12.5,7H11v6l5.25,3.15 0.75,-1.23 -4.5,-2.67z" />
+</vector>