From e091197527417b38c2104f971add26a669312362 Mon Sep 17 00:00:00 2001
From: frank wang <425294756@qq.com>
Date: Tue, 14 Oct 2025 10:18:16 +0800
Subject: [PATCH] =?UTF-8?q?=E6=96=87=E4=BB=B6=E4=B8=8B=E8=BD=BD=E6=8F=90?=
 =?UTF-8?q?=E4=BA=A4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/com/pxkj/jwzs/FirstActivity.java     | 75 ++++++++++++++++++-
 1 file changed, 71 insertions(+), 4 deletions(-)

diff --git a/app/src/main/java/com/pxkj/jwzs/FirstActivity.java b/app/src/main/java/com/pxkj/jwzs/FirstActivity.java
index 3eadfac..2438036 100644
--- a/app/src/main/java/com/pxkj/jwzs/FirstActivity.java
+++ b/app/src/main/java/com/pxkj/jwzs/FirstActivity.java
@@ -215,10 +215,23 @@ public class FirstActivity extends BaseActivity {
 //                || url.endsWith(".xlsx")
 //                || url.contains("/api/file/");
     }
+    private long currentDownloadId = -1; // 保存当前下载任务ID
 
     private void downloadFile(String url) {
         try {
-            DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
+            if (TextUtils.isEmpty(url)) {
+                Toast.makeText(this, "下载地址为空", Toast.LENGTH_SHORT).show();
+                return;
+            }
+
+            if (url.startsWith("blob:") || url.startsWith("data:")) {
+                Toast.makeText(this, "无法直接下载 Blob 文件，请检查前端下载逻辑", Toast.LENGTH_SHORT).show();
+                return;
+            }
+
+            Uri uri = Uri.parse(url);
+            DownloadManager.Request request = new DownloadManager.Request(uri);
+
             String fileName = URLUtil.guessFileName(url, null, null);
             request.setTitle(fileName);
             request.setDescription("正在下载文件...");
@@ -227,10 +240,64 @@ public class FirstActivity extends BaseActivity {
             request.allowScanningByMediaScanner();
             request.addRequestHeader("User-Agent", System.getProperty("http.agent"));
 
-            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
-            dm.enqueue(request);
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                request.setRequiresCharging(false);
+                request.setAllowedOverMetered(true);
+                request.setAllowedOverRoaming(true);
+            }
+
+            String mimeType = getMimeTypeForUrl(url);
+            request.setMimeType(!TextUtils.isEmpty(mimeType) ? mimeType : "application/octet-stream");
+
+            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
+            if (dm != null) {
+                currentDownloadId = dm.enqueue(request);
+                Toast.makeText(this, "文件已开始下载，请等待", Toast.LENGTH_SHORT).show();
+
+                // ✅ 注册广播监听下载完成事件
+                registerReceiver(new android.content.BroadcastReceiver() {
+                    @Override
+                    public void onReceive(Context context, android.content.Intent intent) {
+                        long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
+                        if (id == currentDownloadId) {
+                            DownloadManager.Query query = new DownloadManager.Query();
+                            query.setFilterById(id);
+                            android.database.Cursor cursor = dm.query(query);
+                            if (cursor != null && cursor.moveToFirst()) {
+                                int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
+                                if (DownloadManager.STATUS_SUCCESSFUL == cursor.getInt(columnIndex)) {
+                                    String uriString = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
+                                    if (uriString != null) {
+                                        try {
+                                            Uri fileUri = Uri.parse(uriString);
+                                            String type = getMimeTypeForUrl(fileUri.toString());
+
+                                            android.content.Intent openIntent = new android.content.Intent(android.content.Intent.ACTION_VIEW);
+                                            openIntent.setFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK | android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION);
+                                            openIntent.setDataAndType(fileUri, type);
+
+                                            // ✅ 检查系统是否有能打开的 App
+                                            if (openIntent.resolveActivity(context.getPackageManager()) != null) {
+                                                context.startActivity(openIntent);
+                                            } else {
+                                                Toast.makeText(context, "下载完成，请前往“下载”文件夹手动打开该文件", Toast.LENGTH_LONG).show();
+                                            }
+                                        } catch (Exception e) {
+                                            Toast.makeText(context, "下载完成，但无法打开文件: " + e.getMessage(), Toast.LENGTH_SHORT).show();
+                                        }
+                                    }
+                                }
+                                cursor.close();
+                            }
+                            // ✅ 只监听一次下载任务
+                            unregisterReceiver(this);
+                        }
+                    }
+                }, new android.content.IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
+            } else {
+                Toast.makeText(this, "系统下载服务不可用", Toast.LENGTH_SHORT).show();
+            }
 
-            Toast.makeText(this, "文件已开始下载，完成后可在通知栏查看", Toast.LENGTH_SHORT).show();
         } catch (Exception e) {
             e.printStackTrace();
             Toast.makeText(this, "下载失败: " + e.getMessage(), Toast.LENGTH_SHORT).show();