FileProvider-从下载目录打开文件 [英] FileProvider - Open File from Download Directory

问题描述

我无法从下载文件夹中打开任何文件。

I can't open any file from Download Folder.

我可以下载文件并使用以下方法保存在下载文件夹中：

I can download a file and save in Download Folder with this:

   DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
    request.setDescription(descricao);
    request.setTitle(titulo);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        request.allowScanningByMediaScanner();
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    }
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, nome);

    enq = downloadManager.enqueue(request);

此后，我的文件正确保存在目录文件夹中：Android >> Internal Shared Storage >>下载。
***我看到此路径是​​在ubuntu中手动打开设备的HD。如图所示为路径。
通过ubuntu文件夹安装Android HD-查看路径

After this, my file is correct saved at Directory Folder: Android >> Internal Shared Storage >> Download. ***This path I see manually opening the device's hd in ubuntu. As the image shows the path. Android HD by ubuntu folder - see the path

然后尝试使用以下命令打开此文件：

And I try open this file with this:

downloadManager = (DownloadManager)getContext().getSystemService(DOWNLOAD_SERVICE);
        BroadcastReceiver receiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                if(DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
                    long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
                    DownloadManager.Query query = new DownloadManager.Query();
                    query.setFilterById(enq);
                    Cursor c = downloadManager.query(query);
                    if(c.moveToFirst()) {
                        int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
                        if(DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
                            String uriString = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));

                            if (uriString.substring(0, 7).matches("file://")) {
                                uriString =  uriString.substring(7);
                            }

                            File file = new File(uriString);

                            Uri uriFile = FileProvider.getUriForFile(getContext(), BuildConfig.APPLICATION_ID + ".fileprovider", file);
                            String mimetype = "application/pdf";
                            Intent myIntent = new Intent(Intent.ACTION_VIEW);
                            myIntent.setDataAndType(uriFile, mimetype);

                            Intent intentChooser = Intent.createChooser(myIntent, "Choose Pdf Application");
                            startActivity(intentChooser);
                        }
                    }
                }
            }
        };

        getContext().registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

我在清单中声明我的文件提供程序：

I declare my file provider in manifest with this:

    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
    </provider>

并带有以下内容：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="Download" path="Download/"/>
</paths>

但是当我单击下载按钮时，我收到此消息：无法访问此文件。检查位置或网络，然后重试。

But when I click the button to download I receive this message: "This file coud be not accessed. Check the location or the network and try again."

恢复：

1-已下载文件，然后保存在目录文件夹中。

1 - The file is downloaded and saved at the directory folder.

2-意图已启动，但文件未打开。

2 - The intent is started, but the file is not openned.

3-调试模式在新文件（urlString）处提供给我： urlString = / storage / emulated / 0 / Download / name.pdf

3 - Debug mode give me this at "new File(urlString)": "urlString=/storage/emulated/0/Download/name.pdf"

4-在调试模式为 FileProvider.getUriFromFile ...：

4 - At "FileProvider.getUriFromFile..." debug mode have this:

uriFile = content：//com.example.android.parlamentaresapp.fileprovider/Download/name.pdf

"uriFile = content://com.example.android.parlamentaresapp.fileprovider/Download/name.pdf"

谢谢。

推荐答案

致电 startActivity（）一起使用的 Intent 上> addFlags（Intent.FLAG_GRANT_READ_URI_PERMISSION）和 FileProvider Uri 。否则，该活动将无权访问您的内容。

Call addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION) on the Intent that you use with startActivity() and the FileProvider Uri. Without that, the activity has no rights to access your content.

这篇关于FileProvider-从下载目录打开文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！