Add stub for android, with unimplemented error.

src/lib.rs

@@ -22,6 +22,10 @@ mod platform;
 #[path = "platform/ios.rs"]
 mod platform;
 
+#[cfg(target_os = "android")]
+#[path = "platform/android.rs"]
+mod platform;
+
 use raw_window_handle::HasRawWindowHandle;
 use std::error::Error;
 

src/platform/android.rs

@@ -0,0 +1,38 @@
+use crate::ClipboardProvider;
+
+use raw_window_handle::HasRawWindowHandle;
+use std::error::Error;
+
+pub fn new_clipboard<W: HasRawWindowHandle>(
+    _window: &W,
+) -> Result<Box<dyn ClipboardProvider>, Box<dyn Error>> {
+    Ok(Box::new(Clipboard::new()?))
+}
+
+pub struct Clipboard;
+
+impl Clipboard {
+    pub fn new() -> Result<Clipboard, Box<dyn Error>> {
+        Ok(Self)
+    }
+}
+
+#[derive(Debug)]
+#[allow(non_camel_case_types)]
+pub enum AndroidClipboardError {
+    Unimplemented,
+}
+
+impl std::fmt::Display for AndroidClipboardError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Unimplemented")
+    }
+}
+
+impl Error for AndroidClipboardError {}
+
+impl ClipboardProvider for Clipboard {
+    fn read(&self) -> Result<String, Box<dyn Error>> {
+        Err(Box::new(AndroidClipboardError::Unimplemented))
+    }
+}