[@capacitor/share] Android: sharing several images with text to WhatsApp only sends the text (intent type forced to */*)

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@RaphaelFakhri がすでに取り組んでいます。

2026年10月21日 から。

  • #2618 @RaphaelFakhri による — オープン

評価

難易度
3/5
見積もり時間
1〜2日
初心者へのやさしさ
78/100
issue の種類
バグ
明瞭さ
明確に書かれている
活発さ
活発
技術スタック
android, java
領域
mobile

調査の方向性

Start at the SharePlugin.shareFiles entry point and inspect how MIME types and ACTION_SEND_MULTIPLE intents are built. Reproduce the issue with several JPEG URIs and text, then verify that WhatsApp receives every image and the text while mixed or unknown types retain the documented fallback behavior.

索引モデルが issue の本文から書いたものです。

説明

platform: android

Bug Report

Plugin(s)

@capacitor/share 8.0.2

Capacitor Version
Latest Dependencies:
  @capacitor/cli: 8.5.2
  @capacitor/core: 8.5.2
  @capacitor/android: 8.5.2
  @capacitor/ios: 8.5.2
Installed Dependencies:
  @capacitor/ios: not installed
  @capacitor/cli: 8.5.2
  @capacitor/core: 8.5.2
  @capacitor/android: 8.5.2
Platform(s)

Android

Current Behavior

Sharing several image files together with a text to WhatsApp only delivers the text: WhatsApp drops all the images. Sharing a single image with the same text works.

In SharePlugin.shareFiles, the intent type is forced to */* as soon as more than one file is shared, even when every file has a known MIME type:

String type = getMimeType(file);
if (type == null || filesList.size() > 1) {
    type = "*/*";
}
intent.setType(type);

With three JPEG files, the ACTION_SEND_MULTIPLE intent is sent as */*, and WhatsApp treats it as a text-only share.

We confirmed it on a physical Android phone. Our logs showed the three files written to the cache and passed to Share.share, the plugin resolving with activityType: com.whatsapp, and still only the text reaching the conversation.

Expected Behavior

The intent should carry the common MIME type of the shared files, as Chrome's Web Share does: image/jpeg when all files are JPEG, image/* when they are mixed image types, and */* only when the types differ or are unknown. WhatsApp then receives all the images with the text.

Code Reproduction
import { Directory, Filesystem } from '@capacitor/filesystem'
import { Share } from '@capacitor/share'

// three small JPEGs written to the cache
const uris = []
for (const name of ['a.jpg', 'b.jpg', 'c.jpg']) {
  const { uri } = await Filesystem.writeFile({ path: `share/${name}`, data: JPEG_BASE64, directory: Directory.Cache, recursive: true })
  uris.push(uri)
}
await Share.share({ text: 'Three photos', files: uris })
// choose WhatsApp → only "Three photos" is sent
// with files: [uris[0]] → the photo and the text are sent
Other Technical Details

The following change fixes it for us. We apply it with patch-package, and three images plus the text now reach WhatsApp:

-                    String type = getMimeType(file);
-                    if (type == null || filesList.size() > 1) {
-                        type = "*/*";
-                    }
-                    intent.setType(type);
+                    String type = getMimeType(file);
+                    if (type == null) {
+                        sharedType = "*/*";
+                    } else if (sharedType == null) {
+                        sharedType = type;
+                    } else if (!sharedType.equals(type)) {
+                        boolean bothImages = sharedType.startsWith("image/") && type.startsWith("image/");
+                        sharedType = bothImages ? "image/*" : "*/*";
+                    }
+                    intent.setType(sharedType);

(sharedType is a String declared as null before the loop.)

We also set a ClipData covering every URI for ACTION_SEND_MULTIPLE, since the plugin currently only does it for a single file. That was not enough on its own: the MIME type was the deciding factor.

if (fileUris.size() > 1) {
    ClipData clipData = ClipData.newRawUri("", fileUris.get(0));
    for (int i = 1; i < fileUris.size(); i++) {
        clipData.addItem(new ClipData.Item(fileUris.get(i)));
    }
    intent.setClipData(clipData);
    intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, fileUris);
}

Related: #2474 (unknown extensions also fall back to */*, which WhatsApp likewise discards).

主要言語
Java
スター
688
フォーク
692
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