fix(clipboard): Android warnings and build on SDK under 28 (tauri-apps#1771)

Author: lucasfernog

.changes/fix-clipboard-warnings-sdk.md

@@ -0,0 +1,6 @@
+---
+"clipboard-manager": patch
+"clipboard-manager-js": patch
+---
+
+Fix warnings and clear implementation on Android below SDK 28.

examples/api/src/views/Clipboard.svelte

@@ -1,59 +1,59 @@
 <script>
-  import * as clipboard from "@tauri-apps/plugin-clipboard-manager";
-  import { open } from "@tauri-apps/plugin-dialog";
-  import { arrayBufferToBase64 } from "../lib/utils";
-  import { readFile } from "@tauri-apps/plugin-fs";
+  import * as clipboard from '@tauri-apps/plugin-clipboard-manager'
+  import { open } from '@tauri-apps/plugin-dialog'
+  import { arrayBufferToBase64 } from '../lib/utils'
+  import { readFile } from '@tauri-apps/plugin-fs'
 
-  export let onMessage;
-  export let insecureRenderHtml;
-  let text = "clipboard message";
+  export let onMessage
+  export let insecureRenderHtml
+  let text = 'clipboard message'
 
   function writeText() {
     clipboard
       .writeText(text)
       .then(() => {
-        onMessage("Wrote to the clipboard");
+        onMessage('Wrote to the clipboard')
       })
-      .catch(onMessage);
+      .catch(onMessage)
   }
 
   async function writeImage() {
     try {
-      const res = await open({
-        title: "Image to write to clipboard",
+      const path = await open({
+        title: 'Image to write to clipboard',
         filters: [
           {
-            name: "Clipboard IMG",
-            extensions: ["png", "jpg", "jpeg"],
-          },
-        ],
-      });
-      const bytes = await readFile(res.path);
-      await clipboard.writeImage(bytes);
-      onMessage("wrote image");
+            name: 'Clipboard IMG',
+            extensions: ['png', 'jpg', 'jpeg']
+          }
+        ]
+      })
+      const bytes = await readFile(path)
+      await clipboard.writeImage(bytes)
+      onMessage('wrote image')
     } catch (e) {
-      onMessage(e);
+      onMessage(e)
     }
   }
 
   async function read() {
     try {
-      const image = await clipboard.readImage();
+      const image = await clipboard.readImage()
       arrayBufferToBase64(await image.rgba(), function (base64) {
-        const src = "data:image/png;base64," + base64;
-        insecureRenderHtml('<img src="' + src + '"></img>');
-      });
-      return;
+        const src = 'data:image/png;base64,' + base64
+        insecureRenderHtml('<img src="' + src + '"></img>')
+      })
+      return
     } catch (_) {}
 
     clipboard
       .readText()
       .then((contents) => {
-        onMessage(`Clipboard contents: ${contents}`);
+        onMessage(`Clipboard contents: ${contents}`)
       })
       .catch((e) => {
-        onMessage(e);
-      });
+        onMessage(e)
+      })
   }
 </script>
 
@@ -65,6 +65,5 @@
   />
   <button class="btn" type="button" on:click={writeText}>Write</button>
   <button class="btn" type="button" on:click={writeImage}>Pick Image</button>
-
   <button class="btn" type="button" on:click={read}>Read</button>
 </div>

plugins/clipboard-manager/android/src/main/java/ClipboardPlugin.kt

@@ -4,12 +4,12 @@
 
 package app.tauri.clipboard
 
-import android.R.attr.value
 import android.app.Activity
 import android.content.ClipData
 import android.content.ClipDescription
 import android.content.ClipboardManager
 import android.content.Context
+import android.os.Build
 import app.tauri.annotation.Command
 import app.tauri.annotation.InvokeArg
 import app.tauri.annotation.TauriPlugin
@@ -59,6 +59,9 @@ internal class ReadClipDataSerializer @JvmOverloads constructor(t: Class<ReadCli
 
         jgen.writeEndObject()
       }
+      else -> {
+        throw Exception("unimplemented ReadClipData")
+      }
     }
 
     jgen.writeEndObject()
@@ -93,7 +96,7 @@ class ClipboardPlugin(private val activity: Activity) : Plugin(activity) {
       is WriteOptions.PlainText -> {
         ClipData.newPlainText(args.label, args.text)
       } else -> {
-        invoke.reject("Invalid write options provided")
+        invoke.reject("unimplemented WriteOptions")
         return
       }
 
@@ -128,7 +131,11 @@ class ClipboardPlugin(private val activity: Activity) : Plugin(activity) {
   @Command
   fun clear(invoke: Invoke) {
       if (manager.hasPrimaryClip()) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
           manager.clearPrimaryClip()
+        } else {
+          manager.setPrimaryClip(ClipData.newPlainText("", ""))
+        }
       }
       invoke.resolve()
   }

plugins/clipboard-manager/guest-js/index.ts

@@ -114,6 +114,11 @@ async function writeHtml(html: string, altHtml?: string): Promise<void> {
 
 /**
  * Clears the clipboard.
+ *
+ * #### Platform-specific
+ *
+ * - **Android:** Only supported on SDK 28+. For older releases we write an empty string to the clipboard instead.
+ *
  * @example
  * ```typescript
  * import { clear } from '@tauri-apps/plugin-clipboard-manager';