Develop Reference

Display PDF from uri in Android

i'm getting a pdf file from an api, and i got something like that http://x/docs/document1
In my android project, i have like this:
try{
Android.Content.Intent activity = new Android.Content.Intent(this, typeof(WebViewPDF));
activity.AddFlags(Android.Content.ActivityFlags.GrantReadUriPermission);
activity.AddFlags(Android.Content.ActivityFlags.NoHistory);
string uriAndroid = "http://x/docs/document1";
activity.PutExtra("url", JsonConvert.SerializeObject(uriAndroid));
StartActivity(activity);
}catch (Exception){
...
}
The main problem is, i cannot modify the api, so the endpoint is http://x/docs/document1, but if i try another uri, with the .pdf extension, for example https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf it works fine.
I don't know if i need to get that info from the API in a different way,
How can i show the pdf in the webView or external app without download first the doc?

The solution was download first and then open from local.
void PrintPdf(Uri uri)
{
var webClient = new WebClient();
webClient.Proxy = WebRequest.DefaultWebProxy;
webClient.Credentials = new NetworkCredential("UserName", "Pass");
webClient.Encoding = Encoding.UTF8;
var bytes = webClient.DownloadData(uri);
var text = bytes; // get the downloaded text
string localFilename = "NameforPdf.PDF";
string localPath = System.IO.Path.Combine(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads).ToString(), localFilename);
File.WriteAllBytes(localPath, text); // writes to local storage
bool exists = File.Exists(localPath);
if (exists)
{
Java.IO.File file = new Java.IO.File(localPath);
file.SetReadable(true);
//That's the important part, notice the content://
Android.Net.Uri uriLocal = Android.Net.Uri.Parse("content://" + localPath);
Intent intent = new Intent(Intent.ActionView);
intent.SetFlags(ActivityFlags.NewTask);
intent.SetDataAndType(uriLocal, "application/pdf");
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
try
{
StartActivity(intent);
}
catch (Exception)
{
Toast.MakeText(Xamarin.Forms.Forms.Context, "pdf reader not installed", ToastLength.Short).Show();
}
}
}

How to open a file without knowing its extension but knowing full name?

Intent tostart = new Intent(Intent.ACTION_VIEW);
tostart.setDataAndType(Uri.parse(video_path+".***"), "video/*");
startActivity(tostart);
Let's say I have a file path
/mnt/sdcard/video/my_birthday_moovie001
'my_birthday_moovie001' can be either .mkv, .mpg or .mkv. I've tried to add ".***" to the file path but I still can't open the file.

Well i read the comments you have stored your path in db without extensions there are many extensions that exists so android cant automatically pick the extension you have to create some way to detect extension.
following is a robust way that is best match in your case but not recommended in proper cases where extensions are known
public String chk_path(String filePath)
{
//create array of extensions
String[] ext=new String[]{".mkv",".mpg"}; //You can add more as you require
//Iterate through array and check your path which extension with your path exists
String path=null;
for(int i=0;i<ext.Length;i++)
{
File file = new File(filePath+ext[i]);
if(file.exists())
{
//if it exists then combine the extension
path=filePath+ext[i];
break;
}
}
return path;
}
now to play a song in your code
if(chk_path(video_path)!=null)
{
Intent tostart = new Intent(Intent.ACTION_VIEW);
tostart.setDataAndType(Uri.parse(video_path), "video/*");
startActivity(tostart);
}
else
//tell user that although the path in database but file on this path do not exists

Well as I put on comments
You could compare if the path matches with any filename(it doesn't contains the extension) and then if it does you got it.
You can simply do this :
Get the directory path
File extStore = Environment.getExternalStorageDirectory();
Set the file name my_birthday_moovie001 on my example I put unnamed but change it as your like
String NameOfFile = "unnamed";
Add the videos, I put it Downloads but you can change it
String PathWithFolder = extStore + "/Download/";
Create a method that lists all the files from your path
private List<String> getListFiles(File parentDir) {
ArrayList<String> inFiles = new ArrayList<String>();
File[] files = parentDir.listFiles();
for (File file : files) {
if (file.isDirectory()) {
inFiles.addAll(getListFiles(file));
} else {
String AbsolutePath = file.getAbsolutePath();
//Get the file name ex : unnamed.jpg
String nameofFile = AbsolutePath.substring(AbsolutePath.lastIndexOf("/") + 1, AbsolutePath.length());
//Remove the .jpg --> Output unnamed
String fileNameWithoutExtension = nameofFile.substring(0, nameofFile.lastIndexOf('.'));
//Add each file
inFiles.add(fileNameWithoutExtension);
}
}
return inFiles;
}
You got the names of the files doing this
List<String> files = getListFiles(new File(PathWithFolder));
Simply add a for that looks for a match of your file
for (int i = 0; i<=files.size()-1; i++){
if(PathWithFolder.equals(files.get(i))) {
Toast.makeText(MainActivity.this, "You got it!", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this, "You don't.", Toast.LENGTH_SHORT).show();
}
}
If you want to get the path as well and do what #Zain Ul Abidin proposed and compare it on getListFiles() method add this :
String fileExtension = nameofFile.substring(nameofFile.lastIndexOf("."));
Hope it helps.

From the other question :
Consider DirectoryScanner from Apache Ant:
DirectoryScanner scanner = new DirectoryScanner();
scanner.setIncludes(new String[]{"**/*.java"});
scanner.setBasedir("C:/Temp");
scanner.setCaseSensitive(false);
scanner.scan();
String[] files = scanner.getIncludedFiles();
You'll need to reference ant.jar (~ 1.3 MB for ant 1.7.1).
And then, run on files array and check
if files[i].include(yourfile)
yourfile= files[i]

You may try in this way , first getting the name of file and extension then finally compare and implement. like this :
Example file name is 04chamelon and extension is .png:
File f = new File("/mnt/storage/sdcard/Pictures/04chameleon");
File yourDir = new File("/mnt/storage/sdcard/Pictures");
nametwo = f.getName();
for (File fa : yourDir.listFiles()) {
if (fa.isFile())
fa.getName();
String path = fa.getName(); // getting name and extension
filextension = path.substring(path.lastIndexOf(".") + 1); // seperating extension
name1 = fa.getName();
int pos = name1.lastIndexOf(".");
if (pos > 0) {
name1 = name1.substring(0, pos);
}
}
if (name1.equals(nametwo)) {
Intent tostart = new Intent(Intent.ACTION_VIEW);
tostart.setDataAndType(Uri.parse(f + "." + filextension), "image/*");
//tostart.setDataAndType(Uri.parse(f + "." + filextension), "video/*");
startActivity(tostart);
}

With the latest ContentResolver, you can easily make this work using the contentResolver.getType(uri) function which detects the filetype.
private fun getIntentForFile(intent: Intent, filePath: String, context: Context): Intent {
val uri = FileProvider.getUriForFile(
context,
context.applicationContext.packageName + ".fileprovider",
File(filePath)
)
intent.putExtra(Intent.EXTRA_STREAM, uri)
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
intent.setDataAndType(uri, context.contentResolver.getType(uri))
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
return intent
}

Read file of any extension in android programmatically

Just want to confirm that is it possible that when i click on file of any extension will open up with its compatible software in android phone or display me the list of software’s present in mobile which can open the file and if it didn't found any software it will indicate user to first download the software to open that particular file (All this thing need to be done pro grammatically).
Thanks.
Any help will be appreciated.

In order to open the file you can use the following method, If there is no application that can handle given file, it simply shows a Toast saying no application found.
private void viewFile(String filePath, String title, int fileType) {
Uri uri = Uri.parse("file://" + filePath);
Intent intent = new Intent(Intent.ACTION_VIEW);
String dataAndType = getIntentDataAndType(filePath);
intent.setDataAndType(uri, dataAndType);
intent.putExtra(Intent.EXTRA_TITLE, title);
// Verify that the intent will resolve to an activity
if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
startActivity(intent);
} else {
Toast.makeText(getActivity(), "No Application found", Toast.LENGTH_SHORT).show();
}
}
UPDATED :
For finding the mime type of the file.
private String getIntentDataAndType(String filePath) {
String exten = "";
int i = filePath.lastIndexOf('.');
// If the index position is greater than zero then get the substring.
if (i > 0) {
exten = filePath.substring(i + 1);
}
String mimeType = android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(exten);
mimeType = (mimeType == null) ? "*/*" : mimeType;
return mimeType;
}

Launch Adobe Reader in Android App

I have an Android app where I intercept a PDF file download event in the WebView, download it using the DownloadManager, and launch a new intent with the Adobe Reader to display the file. It works fine, except that when the Adobe Reader starts, it displays the following message prior to displaying the actual file:
Read-only document | To modify this document save a copy on your device.
Save | View Read-only
After I dismiss this prompt, the document gets displayed correctly. How can I get rid of the Read-only prompt?
Here is my code:
public class MyDownloadListener implements DownloadListener {
MainActivity activity;
BroadcastReceiver receiver;
DownloadManager downloadManager;
public MyDownloadListener(MainActivity a) {
activity = a;
downloadManager = (DownloadManager) activity.getSystemService(Context.DOWNLOAD_SERVICE);
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);
Query query = new Query();
query.setFilterById(downloadId);
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_FILENAME));
File fileSrc = new File(uriString);
Intent intentPdf = new Intent(Intent.ACTION_VIEW);
intentPdf.setDataAndType(Uri.fromFile(fileSrc), "application/pdf");
intentPdf.setPackage("com.adobe.reader");
intentPdf.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
activity.startActivity(intentPdf);
}
}
}
}
};
activity.registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
#Override
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
Request request = new Request(Uri.parse(url));
downloadManager.enqueue(request);
}
}

As per the official documentation of class DownloadManager.Request
This class contains all the information necessary to request a new
download. The URI is the only required parameter. Note that the
default download destination is a shared volume where the system might
delete your file if it needs to reclaim space for system use. If this
is a problem, use a location on external storage (see
setDestinationUri(Uri).
So default location is more of a cache location and system can delete the file if it require more space. So if you want to kep the file then you can use setDestinationUri to provide the path in the SD card..
And it looks like the default space does not allow any other thread/process other then the download manager to write file in that space, hence the read only message from the adobe reader..

How to open all any fomat files on Android

I try to implement a browser-like app.
I want to let it can open any format files which supported by device.
I know below code can open specific format:
String mimetype = mime_type(FileName);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(File), mimetype);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
public String mime_type(String name) {
String type = null;
String[] mime = {".htm\ttext/html", ".html\ttext/html", ".doc\tapplication/msword", ".ppt\tapplication/vnd.ms-powerpoint", ".xls\tapplication/vnd.ms-excel",
".txt\ttext/plain", ".pdf\tapplication/pdf", ".xlsx\tapplication/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
".pptx\tapplication/vnd.openxmlformats-officedocument.presentationml.presentation", ".docx\tapplication/vnd.openxmlformats-officedocument.wordprocessingml.document"};
int i;
for(i = 0; i < mime.length; i++) {
if(name.toLowerCase().endsWith(mime[i].split("\t")[0])) {
return mime[i].split("\t")[1];
}
}
return type;
}
But the file formats are more than I can list.
If any methods to do it for all formats?
Or any methods to list all applications let user select?

I find set mimetype to */* can arrive it.
It will show all intalled app for select.