fix(mobile): support Android system file picker

mobile-uni/src/services/knowledge.ts

@@ -11,6 +11,8 @@ import type {
 import { apiRequest, apiUrl, authHeaders, readTextPayload } from './api';
 import { getSelectedPosition } from './auth';
 import { fileSelectionFailure } from '../utils/file-selection';
+import { withPlatformFileSelection } from './file-selection-lifecycle';
+import { isAndroidAppRuntime } from './local-file-picker';
 
 type RawKnowledgeSnippet = KnowledgeSnippet & {
   title?: string;
@@ -20,7 +22,44 @@ type RawKnowledgeSnippet = KnowledgeSnippet & {
 const mediaExtensions = ['.jpg', '.jpeg', '.png', '.gif', '.webp', '.bmp', '.mp4', '.mov', '.avi', '.mkv', '.webm', '.m4v'];
 const videoExtensions = new Set(['.mp4', '.mov', '.avi', '.mkv', '.webm', '.m4v']);
 
-export const chooseKnowledgeMedia = () =>
+interface AppMediaFile {
+  tempFilePath?: string;
+  path?: string;
+  size?: number;
+  fileType?: 'image' | 'video';
+}
+
+interface AppChooseMediaResult {
+  tempFiles?: AppMediaFile[];
+}
+
+type UniWithChooseMedia = {
+  chooseMedia?: (options: {
+    count: number;
+    mediaType: Array<'image' | 'video'>;
+    sourceType: Array<'album'>;
+    success: (result: AppChooseMediaResult) => void;
+    fail: (error: unknown) => void;
+  }) => void;
+};
+
+const validateKnowledgeMedia = (
+  path: string,
+  name: string,
+  size: number,
+  declaredKind?: 'image' | 'video'
+): KnowledgeMediaSelectedFile => {
+  if (!path) throw new Error('未获取到附件文件');
+  const extension = `.${name.split('.').pop()?.toLowerCase() || ''}`;
+  const kind = declaredKind || (videoExtensions.has(extension) ? 'video' : 'image');
+  const maxSize = kind === 'video' ? 100 * 1024 * 1024 : 10 * 1024 * 1024;
+  if (size > maxSize) {
+    throw new Error(kind === 'video' ? '视频不能超过 100MB' : '图片不能超过 10MB');
+  }
+  return { path, name, size, kind };
+};
+
+const chooseKnowledgeMediaWithFileInput = () =>
   new Promise<KnowledgeMediaSelectedFile>((resolve, reject) => {
     uni.chooseFile({
       count: 1,
@@ -31,24 +70,49 @@ export const chooseKnowledgeMedia = () =>
         const file = (tempFiles[0] || {}) as { path?: string; name?: string; size?: number };
         const path = file.path || result.tempFilePaths?.[0] || '';
         const name = file.name || path.split('/').pop() || '现场附件';
-        const extension = `.${name.split('.').pop()?.toLowerCase() || ''}`;
-        const kind = videoExtensions.has(extension) ? 'video' : 'image';
         const size = Number(file.size || 0);
-        const maxSize = kind === 'video' ? 100 * 1024 * 1024 : 10 * 1024 * 1024;
-        if (!path) {
-          reject(new Error('未获取到附件文件'));
-          return;
+        try {
+          resolve(validateKnowledgeMedia(path, name, size));
+        } catch (error) {
+          reject(error);
         }
-        if (size > maxSize) {
-          reject(new Error(kind === 'video' ? '视频不能超过 100MB' : '图片不能超过 10MB'));
-          return;
-        }
-        resolve({ path, name, size, kind });
       },
       fail: (error) => reject(fileSelectionFailure(error, '附件'))
     });
   });
 
+const chooseKnowledgeMediaWithAppPicker = () =>
+  new Promise<KnowledgeMediaSelectedFile>((resolve, reject) => {
+    const chooseMedia = (uni as unknown as UniWithChooseMedia).chooseMedia;
+    if (!chooseMedia) {
+      reject(new Error('当前 App 版本无法选择图片或视频'));
+      return;
+    }
+    chooseMedia({
+      count: 1,
+      mediaType: ['image', 'video'],
+      sourceType: ['album'],
+      success: (result) => {
+        const file = result.tempFiles?.[0] || {};
+        const path = file.tempFilePath || file.path || '';
+        const name = path.split('/').pop() || (file.fileType === 'video' ? '现场视频.mp4' : '现场图片.jpg');
+        // App chooseMedia reports the selected file size in KiB.
+        const size = Math.max(0, Number(file.size || 0)) * 1024;
+        try {
+          resolve(validateKnowledgeMedia(path, name, size, file.fileType));
+        } catch (error) {
+          reject(error);
+        }
+      },
+      fail: (error) => reject(fileSelectionFailure(error, '附件'))
+    });
+  });
+
+export const chooseKnowledgeMedia = () =>
+  isAndroidAppRuntime()
+    ? withPlatformFileSelection(chooseKnowledgeMediaWithAppPicker)
+    : chooseKnowledgeMediaWithFileInput();
+
 const normalizeSnippet = (snippet: RawKnowledgeSnippet): KnowledgeSnippet => ({
   ...snippet,
   docTitle: snippet.docTitle || snippet.title || '',