app/clipboard: implement clipboard for Android

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/clipboard/clipboard.go

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build android
+
+// Package clipboard accesses the system clipboard.
+package clipboard
+
+import (
+	"gioui.org/app/internal/window"
+)
+
+// Read the content of the clipboard as a string.
+func Read() (string, error) {
+	return window.ReadClipboard()
+}
+
+// Write a string to the clipboard.
+func Write(s string) error {
+	return window.WriteClipboard(s)
+}