我无法打开“下载文件夹”中的任何文件.

我可以下载一个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,我的文件在目录文件夹中保存正确：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

我尝试用这个打开这个文件：

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：

android:name="android.support.v4.content.FileProvider"

android:authorities="${applicationId}.fileprovider"

android:exported="false"

android:grantUriPermissions="true">

android:name="android.support.FILE_PROVIDER_PATHS"

android:resource="@xml/provider_paths"/>

并与此：

但是,当我单击按钮下载时,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 – 意图已启动,但文件未打开.

3 – 调试模式在“new File(urlString)”中给出了这个：“urlString = / storage / emulated / 0 / Download / name.pdf”

4 – 在“FileProvider.getUriFromFile …”调试模式具有：

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

谢谢.