我无法从下载文件夹中打开任何文件。
我可以下载文件并保存在下载文件夹中:
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);
在此之后,我的文件保存在目录文件夹中:Android>>内部共享存储>>下载。 ***我看到这条路径在ubuntu中手动打开设备的高清。由于图像显示路径。 Android HD by ubuntu folder - see the path
我试着打开这个文件:
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:
<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>
并且用这个:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="Download" path="Download/"/>
</paths>
但是当我点击下载按钮时,我收到此消息:“此文件无法访问。请检查位置或网络,然后重试。”
恢复:
1 - 文件已下载并保存在目录文件夹中。
2 - 意图已开始,但文件未打开。
3 - 调试模式在“new File(urlString)”中给我这个:“urlString = / storage / emulated / 0 / Download / name.pdf”
4 - 在“FileProvider.getUriFromFile ...”调试模式下有:
“uriFile = content://com.example.android.parlamentaresapp.fileprovider/Download/name.pdf”
谢谢。
答案 0 :(得分:15)
致电addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
,与Intent
和startActivity()
FileProvider
一起使用Uri
。没有它,活动无权访问您的内容。