Develop Reference

Getting error toast message on target application when using intent with action_view

I have webview which we have php application loaded. the application lists item which the user selects. when a list is selected. it does a redirect with a file path from the server which is captured using the below code.
1.get the file name and extension from the url and use it too create a new file which we will use it for writing outputstream to it.
2. call the downloadFile() method to read the file
3. call the ShoWeDrawings() passing the filename to use it to read the file and pass it to open it using intent action_view with another app.
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// This is my web site, so do not override; let my WebView load the page
if(url.contains("Files") ) {
String filename = url.substring(url.lastIndexOf('/') +1);
String extStorageDirectory = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS) + "/EASM";
File folder = new File(extStorageDirectory);
if (!folder.exists()) {
folder.mkdir();
}
File file = new File(folder, filename);
try {
file.createNewFile();
} catch (IOException e1) {
e1.printStackTrace();
}
Downloader.DownloadFile( url,file);
ShoWeDrawings(filename);
return true;
}
return false;
}
download class
public class Downloader {
private static Context context;
// public Context context ;
public static void DownloadFile(String fileURL, File directory){
try{
FileOutputStream f = new FileOutputStream(directory);
URL u = new URL(fileURL);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(false);
c.setConnectTimeout(10000);
c.setReadTimeout(10000);
c.connect();
int status = c.getResponseCode();
// InputStream in = c.getErrorStream();
InputStream in = c.getInputStream();
// c.getErrorStream();
byte[] buffer = new byte[4096];
int len1 = 0;
while ((len1 = in.read(buffer)) > 0) {
f.write(buffer, 0, len1);
}
f.close();
in.close();
// Toast.makeText(context.getApplicationContext(), "A new file is downloaded successfully", Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
ShoWeDrawings method
private void ShoWeDrawings(String filename) {
File file = new File( getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)+"/EASM/"+filename);
// Uri uri = Uri.fromFile(file);
try {
Intent mIntent = new Intent(Intent.ACTION_VIEW);
// mIntent.putExtra(DocumentsContract.EXTRA_INITIAL_URI, Uri.fromFile(file));
// mIntent.putExtra(Intent.EXTRA_STREAM,Uri.fromFile(file));
mIntent.setDataAndType(Uri.fromFile(file), "application/octet-stream");
mIntent.setPackage("com.solidworks.eDrawingsAndroid");
mIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// Intent.createChooser(mIntent, "Choose Application");
startActivity(mIntent);
}
catch (Exception e)
{
e.printStackTrace();
}
}
now the problem comes with the opening of the file using the targeted app. i get a toast error message. Im not sure if its due to permissions or its the app that has problems. By the way i have upgraded to android 11 and i cant even view data/ folder on the tablet. i can only see the files via pc. The error message that im getting is - filename:error copying file to documents folder see picture below.
I tried to change the code and restarting the tablet thinking it might have been the updates that i pushed.

Download file within the app by clicking on the weblink.

I am developing app like playstore in which user can download any app. i have many apps in my application that i got from my website through wp api v2. when we click on any of the available application detail opened and it have a download link. when we click on the link it goes to the browser but what i want is when we click on any of the apps downloading link downloading should start within my app with progress bar. i didn't found any appropriate solution yet on stack or anywhere.
Here is the screenshot attached for better understanding. arrow is pointing to the downloading link.

Try this code, you can put this on click of the link(textview)
private static void downloadFile(String url, File outputFile) {
try {
URL u = new URL(url);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new FileOutputStream(outputFile));
fos.write(buffer);
fos.flush();
fos.close();
} catch(FileNotFoundException e) {
return; // swallow a 404
} catch (IOException e) {
return; // swallow a 404
}
}

you can use intent service to download the app.
Here is the code :
public class DownloadService extends IntentService {
File cacheDir;
public DownloadService() {
super("DownloadService");
}
#Override
public void onCreate() {
super.onCreate();
String tmpLocation =
Environment.getExternalStorageDirectory().getPath();
cacheDir = new File(tmpLocation);
if (!cacheDir.exists()) {
cacheDir.mkdirs();
}
}
#Override
protected void onHandleIntent(Intent intent) {
String remoteUrl = intent.getExtras().getString("url");
String location;
String filename =
remoteUrl.substring(
remoteUrl.lastIndexOf(File.separator) + 1);
File tmp = new File(cacheDir.getPath()
+ File.separator + filename);
if (tmp.exists()) {
location = tmp.getAbsolutePath();
stopSelf();
return;
}
try {
URL url = new URL(remoteUrl);
HttpURLConnection httpCon =
(HttpURLConnection) url.openConnection();
if (httpCon.getResponseCode() != 200)
throw new Exception("Failed to connect");
InputStream is = httpCon.getInputStream();
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int n = 0;
while (-1 != (n = is.read(buf))) {
out.write(buf, 0, n);
}
out.close();
is.close();
byte[] response = out.toByteArray();
FileOutputStream fos = new FileOutputStream(tmp);
fos.write(response);
fos.flush();
fos.close();
is.close();
location = tmp.getAbsolutePath();
} catch (Exception e) {
Log.e("Service", "Failed!", e);
}
}
}
Run this service with url passed in the intent

InputStream returns empty file when downloading a PDF

So I'm trying to download a PDF file using HttpURLConnection and I think I've done everything right with the input- and outputstreams, yet when I open the downloaded PDF file (using the built in File Manager in Android and/or ADB), or just inspect it by transferring it to OS X, it's completely empty and the size shows 0 bytes.
The site I'm trying to download the PDF from is:
http://www.pdf995.com/samples/pdf.pdf
Here's my code
public static void DownloadFile(final String fileURL, final File directory) {
Thread thread = new Thread(new Runnable(){
#Override
public void run() {
try {
try {
FileOutputStream f = new FileOutputStream(directory);
URL u = new URL(fileURL);
c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
//c.setRequestProperty("Content-Type", "application/pdf");
//c.setDoOutput(true);
c.connect();
Log.d("debugz", Integer.toString(c.getContentLength()));
InputStream in = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = in.read(buffer)) > 0) {
f.write(buffer, 0, len1);
}
f.flush();
f.getFD().sync();
f.close();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
thread.start();
}
public static String getPDF(String pdfurl) {
String extStorageDirectory = Environment.getExternalStorageDirectory()
.toString();
File folder = new File(extStorageDirectory, "schematisktscheman");
folder.mkdir();
File file = new File(folder, "schemainfo.pdf");
try {
file.createNewFile();
} catch (IOException e1) {
e1.printStackTrace();
}
DownloadFile(pdfurl, file);
return null; //added return
}
In my main activity:
SchedulePdfProcessor.getPDF("http://www.pdf995.com/samples/pdf.pdf");
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory() + "/schematisktscheman/schemainfo.pdf")));
EDIT: I ran the network code on the main thread, which threw an exception. Now creating a new thread for the downloading and it gets the example PDF (http://www.pdf995.com/samples/pdf.pdf) and puts its content in the file all fine.
Thanks to #greenapps!

First, replace:
f.close();
with:
f.flush();
f.getFD().sync();
f.close();
This ensures everything is written to disk before continuing.
Then, you need to use MediaScannerConnection and scanFile() to get the MediaStore to know about the updated file.

I ran the network code on the main thread, which threw an exception. Now creating a new thread for the downloading and it gets the example PDF (http://www.pdf995.com/samples/pdf.pdf) and puts its content in the file all fine.
Thread thread = new Thread(new Runnable(){
#Override
public void run() {
try {
try {
FileOutputStream f = new FileOutputStream(directory);
URL u = new URL(fileURL);
c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
//c.setRequestProperty("Content-Type", "application/pdf");
//c.setDoOutput(true);
c.connect();
Log.d("debugz", Integer.toString(c.getContentLength()));
InputStream in = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = in.read(buffer)) > 0) {
f.write(buffer, 0, len1);
}
f.flush();
f.getFD().sync();
f.close();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
thread.start();

Android - Download and Open Pdf

I have a application that downloads and opens a pdf from a listview click listener.
A file downloads and save to my phone but it has a file size of 0 bytes therefore It can not open. I Used tutorial code from http://www.coderzheaven.com/2013/03/06/download-pdf-file-open-android-installed-pdf-reader/ Here is my code. Any help will be greatly appreciated.
public class OpenPdfActivity extends Activity {
TextView tv_loading;
String dest_file_path = "pdf-test.pdf";
int downloadedSize = 0, totalsize;
String download_file_url = "http://www.education.gov.yk.ca/pdf/pdf-test.pdf";
float per = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
tv_loading = new TextView(this);
setContentView(tv_loading);
tv_loading.setGravity(Gravity.CENTER);
tv_loading.setTypeface(null, Typeface.BOLD);
downloadAndOpenPDF();
}
void downloadAndOpenPDF() {
new Thread(new Runnable() {
public void run() {
Uri path = Uri.fromFile(downloadFile(download_file_url));
try {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
} catch (ActivityNotFoundException e) {
tv_loading
.setError("PDF Reader application is not installed in your device");
}
}
}).start();
}
File downloadFile(String dwnload_file_path) {
File file = null;
try {
URL url = new URL(dwnload_file_path);
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
// connect
urlConnection.connect();
// set the path where we want to save the file
File SDCardRoot = Environment.getExternalStorageDirectory();
// create a new file, to save the downloaded file
file = new File(SDCardRoot, dest_file_path);
FileOutputStream fileOutput = new FileOutputStream(file);
// Stream used for reading the data from the internet
InputStream inputStream = urlConnection.getInputStream();
// this is the total size of the file which we are
// downloading
totalsize = urlConnection.getContentLength();
setText("Starting PDF download...");
// create a buffer...
byte[] buffer = new byte[1024 * 1024];
int bufferLength = 0;
while ((bufferLength = inputStream.read(buffer)) > 0) {
fileOutput.write(buffer, 0, bufferLength);
downloadedSize += bufferLength;
per = ((float) downloadedSize / totalsize) * 100;
setText("Total PDF File size : "
+ (totalsize / 1024)
+ " KB\n\nDownloading PDF " + (int) per
+ "% complete");
}
// close the output stream when complete //
fileOutput.close();
setText("Download Complete. Open PDF Application installed in the device.");
} catch (final MalformedURLException e) {
setTextError("Some error occured. Press back and try again.",
Color.RED);
} catch (final IOException e) {
setTextError("Some error occured. Press back and try again.",
Color.RED);
} catch (final Exception e) {
setTextError(
"Failed to download image. Please check your internet connection.",
Color.RED);
}
return file;
}
void setTextError(final String message, final int color) {
runOnUiThread(new Runnable() {
public void run() {
tv_loading.setTextColor(color);
tv_loading.setText(message);
}
});
}
void setText(final String txt) {
runOnUiThread(new Runnable() {
public void run() {
tv_loading.setText(txt);
}
});
}
}

A couple of things:
Maybe add a timeout?
Try to NOT check the content length for now.
Use BufferedOutputStream
Something like this:
FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream out = new BufferedOutputStream( fos);
try {
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setReadTimeout( 15000);
urlConnection.connect();
try {
InputStream in = urlConnection.getInputStream();
byte[] buffer = new byte[1024 * 1024];
int len = 0;
while (( len = in.read( buffer)) > 0)
{
out.write( buffer, 0, len);
}
out.flush();
} finally {
fos.getFD(). sync();
out.close();
}
} catch (IOException eio) {
Log.e("Download Tag", "Exception in download", eio);
}

(Including the logcat may help to have a better idea of what's going on)
One possible issue is this :
fileOutput.close();
don't ensure that all bytes are written to the disk. If you try to read the file immediately after closing the stream, it's possible that the file is not totally written yet (especially because your buffer is big).
The solution is to request a sync after the close():
fileOutput.close();
fileOutput.getFD().sync();
similar question here

android download large file

i have various files need to download from web into phone
I have done the code but the code only can let me download with the small size such as picture/photo. A large file like .apk which cost around 2mb to >100mb will failed me.
below is the code:
final ProgressDialog progress=ProgressDialog.show(this, "Please wait", "Loading ...", true);
new Thread()
{
public void run()
{
try {
URL url = new URL("http://www.domain.com/apk/Gmail.apk");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
File SDCardRoot = Environment.getExternalStorageDirectory();
File file = new File(SDCardRoot, "Gmail.apk");
FileOutputStream fileOutput = new FileOutputStream(file);
InputStream inputStream = urlConnection.getInputStream();
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
fileOutput.write(buffer, 0, bufferLength);
//downloadedSize += bufferLength;
}
fileOutput.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
progress.dismiss();
}
}.start();