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Code Issues Pull Requests Packages Projects Releases Wiki Activity

文件下载提交

This commit is contained in:
frank wang 2025-10-14 10:18:16 +08:00
parent 4964c7e207
commit e091197527
1 changed files with 71 additions and 4 deletions
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75
app/src/main/java/com/pxkj/jwzs/FirstActivity.java
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@ -215,10 +215,23 @@ public class FirstActivity extends BaseActivity {
// || url.endsWith(".xlsx") // || url.endsWith(".xlsx")
// || url.contains("/api/file/"); // || url.contains("/api/file/");
} }
private long currentDownloadId = -1; // 保存当前下载任务ID
private void downloadFile(String url) { private void downloadFile(String url) {
try { 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); String fileName = URLUtil.guessFileName(url, null, null);
request.setTitle(fileName); request.setTitle(fileName);
request.setDescription("正在下载文件..."); request.setDescription("正在下载文件...");
@ -227,10 +240,64 @@ public class FirstActivity extends BaseActivity {
request.allowScanningByMediaScanner(); request.allowScanningByMediaScanner();
request.addRequestHeader("User-Agent", System.getProperty("http.agent")); request.addRequestHeader("User-Agent", System.getProperty("http.agent"));
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
dm.enqueue(request); 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) { } catch (Exception e) {
e.printStackTrace(); e.printStackTrace();
Toast.makeText(this, "下载失败: " + e.getMessage(), Toast.LENGTH_SHORT).show(); Toast.makeText(this, "下载失败: " + e.getMessage(), Toast.LENGTH_SHORT).show();