android download pdf from url then open it with a pdf reader

Question

I am trying to write an app to download pdfs from url  store them on sd  then open by adobe pdf reader or other apps which ever able to open the pdf   untill now  i had  successfully downloaded and stored it on Sd card   but everytime when i try to open the pdf with a pdf reader  reader crash and say unexpected error occurs   for example  http   maven apache org maven-1 x maven pdf   here is the code for my downloader             code set ui stuff           code set ui stuff      new DownloadFile   execute fileUrl  fileName      private class DownloadFile extends AsyncTask lt String  Void  Void gt             Override         protected Void doInBackground String    strings                String fileUrl   strings 0        - gt  http   maven apache org maven-1 x maven pdf             String fileName   strings 1       - gt  maven pdf             String extStorageDirectory   Environment getExternalStorageDirectory   toString                File folder   new File extStorageDirectory   testthreepdf                folder mkdir                 File pdfFile   new File folder  fileName                try                  pdfFile createNewFile                 catch  IOException e                   e printStackTrace                              FileDownloader downloadFile fileUrl  pdfFile               return null                     public class FileDownloader       private static final int  MEGABYTE   1024   1024       public static void downloadFile String fileUrl  File directory           try                URL url   new URL fileUrl               HttpURLConnection urlConnection    HttpURLConnection url openConnection                urlConnection setRequestMethod  GET                urlConnection setDoOutput true               urlConnection connect                 InputStream inputStream   urlConnection getInputStream                FileOutputStream fileOutputStream   new FileOutputStream directory               int totalSize   urlConnection getContentLength                 byte   buffer   new byte MEGABYTE               int bufferLength   0              while  bufferLength   inputStream read buffer   gt 0                    fileOutputStream write buffer  0  bufferLength                             fileOutputStream close              catch  FileNotFoundException e                e printStackTrace              catch  MalformedURLException e                e printStackTrace              catch  IOException e                e printStackTrace                        in debug mode  i can see the app downloaded it and store this pdf on  storage sdcard testpdf maven pdf   however  i guess the file may be corrupted somehow during downloading  so it doesnt open up properly     here is the code how i intent to open it with other reader app   File pdfFile   new File Environment getExternalStorageDirectory       testthreepdf     fileName       - gt  filename   maven pdf                     Uri path   Uri fromFile pdfFile                       Intent pdfIntent   new Intent Intent ACTION VIEW                       pdfIntent setDataAndType path   application pdf                        pdfIntent setFlags Intent FLAG ACTIVITY CLEAR TOP                        try                          startActivity pdfIntent                        catch ActivityNotFoundException e                           Toast makeText documentActivity   No Application available to view PDF   Toast LENGTH SHORT  show

User · Answer

Download source code from here  Open Pdf from url in Android Programmatically   MainActivity java  package com deepshikha openpdf   import android support v7 app AppCompatActivity  import android os Bundle  import android view View  import android webkit WebView  import android webkit WebViewClient  import android widget ProgressBar   public class MainActivity extends AppCompatActivity       WebView webview      ProgressBar progressbar        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           webview    WebView findViewById R id webview           progressbar    ProgressBar  findViewById R id progressbar           webview getSettings   setJavaScriptEnabled true           String filename   http   www3 nd edu  cpoellab teaching cse40816 android tutorial pdf           webview loadUrl  http   docs google com gview embedded true amp url     filename            webview setWebViewClient new WebViewClient                  public void onPageFinished WebView view  String url                       do your stuff here                 progressbar setVisibility View GONE                                        Thanks

User · Answer

Hi the problem is in FileDownloader class   urlConnection setRequestMethod  GET        urlConnection setDoOutput true     You need to remove the above two lines and everything will work fine  Please mark the question as answered if it is working as expected    Latest solution for the same problem is updated Android PDF Write   Read using Android 9  API level 28    Attaching the working code with screenshots       MainActivity java  package com example downloadread   import java io File  import java io IOException   import android app Activity  import android content ActivityNotFoundException  import android content Intent  import android net Uri  import android os AsyncTask  import android os Bundle  import android os Environment  import android view Menu  import android view View  import android widget Toast   public class MainActivity extends Activity         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main               Override     public boolean onCreateOptionsMenu Menu menu               Inflate the menu  this adds items to the action bar if it is present          getMenuInflater   inflate R menu main  menu           return true             public void download View v                new DownloadFile   execute  http   maven apache org maven-1 x maven pdf    maven pdf                public void view View v                File pdfFile   new File Environment getExternalStorageDirectory       testthreepdf      maven pdf        - gt  filename   maven pdf         Uri path   Uri fromFile pdfFile           Intent pdfIntent   new Intent Intent ACTION VIEW           pdfIntent setDataAndType path   application pdf            pdfIntent setFlags Intent FLAG ACTIVITY CLEAR TOP            try              startActivity pdfIntent            catch ActivityNotFoundException e               Toast makeText MainActivity this   No Application available to view PDF   Toast LENGTH SHORT  show                         private class DownloadFile extends AsyncTask lt String  Void  Void gt             Override         protected Void doInBackground String    strings                String fileUrl   strings 0        - gt  http   maven apache org maven-1 x maven pdf             String fileName   strings 1       - gt  maven pdf             String extStorageDirectory   Environment getExternalStorageDirectory   toString                File folder   new File extStorageDirectory   testthreepdf                folder mkdir                 File pdfFile   new File folder  fileName                try                  pdfFile createNewFile                 catch  IOException e                   e printStackTrace                              FileDownloader downloadFile fileUrl  pdfFile               return null                        FileDownloader java  package com example downloadread   import java io File  import java io FileNotFoundException  import java io FileOutputStream  import java io IOException  import java io InputStream  import java net HttpURLConnection  import java net MalformedURLException  import java net URL   public class FileDownloader       private static final int  MEGABYTE   1024   1024       public static void downloadFile String fileUrl  File directory           try                URL url   new URL fileUrl               HttpURLConnection urlConnection    HttpURLConnection url openConnection                  urlConnection setRequestMethod  GET                  urlConnection setDoOutput true               urlConnection connect                 InputStream inputStream   urlConnection getInputStream                FileOutputStream fileOutputStream   new FileOutputStream directory               int totalSize   urlConnection getContentLength                 byte   buffer   new byte MEGABYTE               int bufferLength   0              while  bufferLength   inputStream read buffer   gt 0                    fileOutputStream write buffer  0  bufferLength                             fileOutputStream close              catch  FileNotFoundException e                e printStackTrace              catch  MalformedURLException e                e printStackTrace              catch  IOException e                e printStackTrace                        AndroidManifest xml   lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android      package  com example downloadread      android versionCode  1      android versionName  1 0   gt        lt uses-sdk         android minSdkVersion  14          android targetSdkVersion  18    gt       lt uses-permission android name  android permission INTERNET  gt  lt  uses-permission gt       lt uses-permission android name  android permission WRITE EXTERNAL STORAGE  gt  lt  uses-permission gt       lt uses-permission android name  android permission ACCESS NETWORK STATE  gt  lt  uses-permission gt       lt uses-permission android name  android permission READ PHONE STATE  gt  lt  uses-permission gt       lt application         android allowBackup  true          android icon   drawable ic launcher          android label   string app name          android theme   style AppTheme   gt           lt activity             android name  com example downloadread MainActivity              android label   string app name   gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                    lt category android name  android intent category LAUNCHER    gt               lt  intent-filter gt           lt  activity gt       lt  application gt    lt  manifest gt    activity main xml   lt RelativeLayout xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      android paddingBottom   dimen activity vertical margin      android paddingLeft   dimen activity horizontal margin      android paddingRight   dimen activity horizontal margin      android paddingTop   dimen activity vertical margin      tools context   MainActivity   gt        lt Button         android id    id button1          android layout width  match parent          android layout height  wrap content          android layout alignParentLeft  true          android layout alignParentTop  true          android layout marginTop  15dp          android text  download          android onClick  download    gt        lt Button         android id    id button2          android layout width  match parent          android layout height  wrap content          android layout alignParentLeft  true          android layout alignParentRight  true          android layout below    id button1          android layout marginTop  38dp          android text  view          android onClick  view    gt    lt  RelativeLayout gt

User · Answer

This is the best method to download and view PDF file You can just call it from anywhere as like  PDFTools showPDFUrl context  url    here below put the code  It will works fine  public class PDFTools   private static final String TAG    PDFTools   private static final String GOOGLE DRIVE PDF READER PREFIX    http   drive google com viewer url    private static final String PDF MIME TYPE    application pdf   private static final String HTML MIME TYPE    text html     public static void showPDFUrl final Context context  final String pdfUrl         if   isPDFSupported  context               downloadAndOpenPDF context  pdfUrl         else           askToOpenPDFThroughGoogleDrive  context  pdfUrl               TargetApi Build VERSION CODES GINGERBREAD  public static void downloadAndOpenPDF final Context context  final String pdfUrl           Get filename       final String filename   pdfUrl substring  pdfUrl lastIndexOf          1        String filename           try           filename   new GetFileInfo   execute pdfUrl  get          catch  InterruptedException e            e printStackTrace          catch  ExecutionException e            e printStackTrace                 The place where the downloaded PDF file will be put     final File tempFile   new File  context getExternalFilesDir  Environment DIRECTORY DOWNLOADS    filename        Log e TAG  File Path   tempFile       if   tempFile exists                  If we have downloaded the file before  just go ahead and show it          openPDF  context  Uri fromFile  tempFile              return                Show progress dialog while downloading     final ProgressDialog progress   ProgressDialog show  context  context getString  R string pdf show local progress title    context getString  R string pdf show local progress content    true            Create the download request     DownloadManager Request r   new DownloadManager Request  Uri parse  pdfUrl          r setDestinationInExternalFilesDir  context  Environment DIRECTORY DOWNLOADS  filename        final DownloadManager dm    DownloadManager  context getSystemService  Context DOWNLOAD SERVICE        BroadcastReceiver onComplete   new BroadcastReceiver              Override         public void onReceive Context context  Intent intent                if    progress isShowing                       return                            context unregisterReceiver  this                 progress dismiss                long downloadId   intent getLongExtra  DownloadManager EXTRA DOWNLOAD ID  -1                Cursor c   dm query  new DownloadManager Query   setFilterById  downloadId                   if   c moveToFirst                       int status   c getInt  c getColumnIndex  DownloadManager COLUMN STATUS                      if   status    DownloadManager STATUS SUCCESSFUL                         openPDF  context  Uri fromFile  tempFile                                                  c close                         context registerReceiver  onComplete  new IntentFilter  DownloadManager ACTION DOWNLOAD COMPLETE              Enqueue the request     dm enqueue  r        public static void askToOpenPDFThroughGoogleDrive  final Context context  final String pdfUrl         new AlertDialog Builder  context                setTitle  R string pdf show online dialog title                setMessage  R string pdf show online dialog question                setNegativeButton  R string pdf show online dialog button no  null                setPositiveButton  R string pdf show online dialog button yes  new DialogInterface OnClickListener                      Override                 public void onClick DialogInterface dialog  int which                        openPDFThroughGoogleDrive context  pdfUrl                                                 show       public static void openPDFThroughGoogleDrive final Context context  final String pdfUrl        Intent i   new Intent  Intent ACTION VIEW        i setDataAndType Uri parse GOOGLE DRIVE PDF READER PREFIX   pdfUrl    HTML MIME TYPE        context startActivity  i       public static final void openPDF Context context  Uri localUri         Intent i   new Intent  Intent ACTION VIEW        i setDataAndType  localUri  PDF MIME TYPE        context startActivity  i       public static boolean isPDFSupported  Context context         Intent i   new Intent  Intent ACTION VIEW        final File tempFile   new File  context getExternalFilesDir  Environment DIRECTORY DOWNLOADS     test pdf         i setDataAndType  Uri fromFile  tempFile    PDF MIME TYPE        return context getPackageManager   queryIntentActivities  i  PackageManager MATCH DEFAULT ONLY   size    gt  0        get File name from url static class GetFileInfo extends AsyncTask lt String  Integer  String gt        protected String doInBackground String    urls                URL url          String filename   null          try               url   new URL urls 0                HttpURLConnection conn    HttpURLConnection  url openConnection                conn connect                conn setInstanceFollowRedirects false               if conn getHeaderField  Content-Disposition    null                   String depo   conn getHeaderField  Content-Disposition                     String depoSplit     depo split  filename                     filename   depoSplit 1  replace  filename        replace           trim                 else                  filename    download pdf                           catch  MalformedURLException e1                e1 printStackTrace              catch  IOException e                      return filename              Override     protected void onPreExecute             super onPreExecute               Override     protected void onPostExecute String result            super onPostExecute result              use result as file name              try it  it will works  enjoy

[android] android download pdf from url then open it with a pdf reader

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