Added android support

Cargo.toml

@@ -25,6 +25,10 @@ objc = "0.2"
 objc_id = "0.1"
 objc-foundation = "0.1"
 
+[target.'cfg(target_os = "android")'.dependencies]
+jni = ">=0.19"
+ndk-context = ">=0.1"
+
 [target.'cfg(all(unix, not(any(target_os="macos", target_os="android", target_os="ios", target_os="emscripten"))))'.dependencies]
 x11-clipboard = { version = "0.5.1", optional = true }
 smithay-clipboard = { version = "0.6.0", optional = true }

README.md

@@ -27,7 +27,14 @@ fn get_contents(&mut self) -> Result<String, Box<Error>>;
 fn set_contents(&mut self, String) -> Result<(), Box<Error>>;
 ```
 
-`ClipboardContext` is a type alias for one of {`WindowsClipboardContext`, `OSXClipboardContext`, `X11ClipboardContext`, `NopClipboardContext`}, all of which implement `ClipboardProvider`. Which concrete type is chosen for `ClipboardContext` depends on the OS (via conditional compilation).
+`ClipboardContext` is a type alias for one of the following types implementing `ClipboardProvider`. Which concrete type is chosen for ClipboardContext depends on the OS(via conditional compilation).
+
+- `WindowsClipboardContext`
+- `AndroidClipboardContext`
+- `OSXClipboardContext`
+- `X11ClipboardContext`
+- `NopClipboardContext`
+
 
 ## License
 

src/android_clipboard.rs

@@ -0,0 +1,87 @@
+use crate::common::{ClipboardProvider, Result};
+use jni::objects::JString;
+use std::ffi::CStr;
+
+pub struct AndroidClipboardContext;
+
+impl AndroidClipboardContext {
+    #[inline]
+    pub fn new() -> Result<Self> {
+        Ok(AndroidClipboardContext)
+    }
+}
+
+impl ClipboardProvider for AndroidClipboardContext {
+    fn get_contents(&mut self) -> Result<String> {
+        let ctx = ndk_context::android_context();
+        let vm = unsafe { jni::JavaVM::from_raw(ctx.vm().cast()) }?;
+        let env = vm.attach_current_thread()?;
+        let class_ctx = env.find_class("android/content/Context")?;
+        let service_field =
+            env.get_static_field(class_ctx, "CLIPBOARD_SERVICE", "Ljava/lang/String;")?;
+        let clipboard_manager = env
+            .call_method(
+                ctx.context() as jni::sys::jobject,
+                "getSystemService",
+                "(Ljava/lang/String;)Ljava/lang/Object;",
+                &[service_field],
+            )?
+            .l()?;
+
+        let clip_data = env
+            .call_method(clipboard_manager, "getPrimaryClip", "()Landroid/content/ClipData;", &[])?
+            .l()?;
+
+        let item = env
+            .call_method(clip_data, "getItemAt", "(I)Landroid/content/ClipData$Item;", &[
+                0i32.into()
+            ])?
+            .l()?;
+
+        let char_seq = env.call_method(item, "getText", "()Ljava/lang/CharSequence;", &[])?.l()?;
+
+        let jstring = JString::from(
+            env.call_method(char_seq, "toString", "()Ljava/lang/String;", &[])?.l()?.into_inner(),
+        );
+
+        let ptr = env.get_string_utf_chars(jstring)?;
+
+        let output_string = unsafe { CStr::from_ptr(ptr).to_owned().into_string()? };
+
+        env.release_string_utf_chars(jstring, ptr)?;
+        Ok(output_string)
+    }
+
+    fn set_contents(&mut self, text: String) -> Result<()> {
+        let ctx = ndk_context::android_context();
+        let vm = unsafe { jni::JavaVM::from_raw(ctx.vm().cast()) }?;
+        let env = vm.attach_current_thread()?;
+        let class_ctx = env.find_class("android/content/Context")?;
+        let service_field =
+            env.get_static_field(class_ctx, "CLIPBOARD_SERVICE", "Ljava/lang/String;")?;
+        let clipboard_manager = env
+            .call_method(
+                ctx.context() as jni::sys::jobject,
+                "getSystemService",
+                "(Ljava/lang/String;)Ljava/lang/Object;",
+                &[service_field],
+            )?
+            .l()?;
+
+        let class_clip_data = env.find_class("android/content/ClipData")?;
+
+        let clip_data = env.call_static_method(
+            class_clip_data,
+            "newPlainText",
+            "(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Landroid/content/ClipData;",
+            &[env.new_string("text").unwrap().into(), env.new_string(text).unwrap().into()],
+        )?;
+
+        env.call_method(clipboard_manager, "setPrimaryClip", "(Landroid/content/ClipData;)V", &[
+            clip_data,
+        ])?
+        .v()?;
+
+        Ok(())
+    }
+}

src/lib.rs

@@ -42,6 +42,9 @@ pub mod x11_clipboard;
 #[cfg(windows)]
 pub mod windows_clipboard;
 
+#[cfg(target_os = "android")]
+pub mod android_clipboard;
+
 #[cfg(target_os = "macos")]
 pub mod osx_clipboard;
 
@@ -63,7 +66,7 @@ pub type ClipboardContext = windows_clipboard::WindowsClipboardContext;
 #[cfg(target_os = "macos")]
 pub type ClipboardContext = osx_clipboard::OSXClipboardContext;
 #[cfg(target_os = "android")]
-pub type ClipboardContext = nop_clipboard::NopClipboardContext; // TODO: implement AndroidClipboardContext
+pub type ClipboardContext = android_clipboard::AndroidClipboardContext;
 #[cfg(target_os = "ios")]
 pub type ClipboardContext = nop_clipboard::NopClipboardContext; // TODO: implement IOSClipboardContext
 #[cfg(not(any(