Ouvrir un PDF et autres sous PhoneGap/Cordova sous Android

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Description

A force de chercher comment ouvrir un fichier PDF ou d'autres fichiers (Audio, Vidéo, Excel, Word, etc...) dans une application Phonegap sous android, j'ai trouvé ce morceau de code :

D'abord un plugin phonegap a mettre dans un package java com.phonegap.plugins.file : 
 
package com.phonegap.plugins.file; 

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.URL; 
import java.net.URLConnection; 

import org.json.JSONArray; 
import org.json.JSONException; 

import android.content.Context; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.net.Uri; 

import org.apache.cordova.api.CallbackContext; 
import org.apache.cordova.api.CordovaPlugin; 
import org.apache.cordova.api.PluginResult; 

public class FileOpener extends CordovaPlugin { 
 private static final String YOU_TUBE = "youtube.com"; 
 private static final String ASSETS = "file:///android_asset/"; 

 public boolean execute(String action, JSONArray args, CallbackContext callbackContext)  
 { 
  PluginResult.Status status = PluginResult.Status.OK; 
  String result = ""; 

  try { 
   if (action.equals("openFile")) { 
    openFile(args.getString(0)); 
   } 
   else { 
    status = PluginResult.Status.INVALID_ACTION; 
   } 
   callbackContext.sendPluginResult(new PluginResult(status, result)); 
  } catch (JSONException e) { 
   e.printStackTrace(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
  return true; 
 } 

 private void openFile(String url) throws IOException { 

  if (url.contains("bit.ly/") || url.contains("goo.gl/") || url.contains("tinyurl.com/") || url.contains("youtu.be/")) { 
   //support for google / bitly / tinyurl / youtube shortens 
   URLConnection con = new URL(url).openConnection(); 
   con.connect(); 
   InputStream is = con.getInputStream(); 
   //new redirected url 
   url = con.getURL().toString(); 
   is.close(); 
  } 
  // Create URI 
  Uri uri = Uri.parse(url); 

  Intent intent = null; 
  // Check what kind of file you are trying to open, by comparing the url with extensions. 
  // When the if condition is matched, plugin sets the correct intent (mime) type,  
  // so Android knew what application to use to open the file 
  if (url.contains(YOU_TUBE)) { 
   // If we don't do it this way you don't have the option for youtube 
   uri = Uri.parse("vnd.youtube:" + uri.getQueryParameter("v")); 
   if (isYouTubeInstalled()) { 
    intent = new Intent(Intent.ACTION_VIEW, uri); 
   } else { 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setData(Uri.parse("market://details?id=com.google.android.youtube")); 
   } 
  } else if(url.contains(ASSETS)) { 
   // get file path in assets folder 
   String filepath = url.replace(ASSETS, ""); 
   // get actual filename from path as command to write to internal storage doesn't like folders 
   String filename = filepath.substring(filepath.lastIndexOf("/")+1, filepath.length()); 

   // Don't copy the file if it already exists 
   File fp = new File(this.cordova.getActivity().getFilesDir() + "/" + filename); 
   if (!fp.exists()) { 
    this.copy(filepath, filename); 
   } 
   // change uri to be to the new file in internal storage 
   uri = Uri.parse("file://" + this.cordova.getActivity().getFilesDir() + "/" + filename); 

   if (url.contains(".doc") || url.contains(".docx")) { 
    // Word document 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/msword"); 
   } else if(url.contains(".pdf")) { 
    // PDF file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/pdf"); 
   } else if(url.contains(".ppt") || url.contains(".pptx")) { 
    // Powerpoint file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/vnd.ms-powerpoint"); 
   } else if(url.contains(".xls") || url.contains(".xlsx")) { 
    // Excel file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/vnd.ms-excel"); 
   } else if(url.contains(".rtf")) { 
    // RTF file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/rtf"); 
   } else if(url.contains(".wav")) { 
    // WAV audio file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "audio/x-wav"); 
   } else if(url.contains(".gif")) { 
    // GIF file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "image/gif"); 
   } else if(url.contains(".jpg") || url.contains(".jpeg")) { 
    // JPG file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "image/jpeg"); 
   } else if(url.contains(".txt")) { 
    // Text file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "text/plain"); 
   } else if(url.contains(".apk")) { 
    // Text file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/apk"); 
   } else if(url.contains(".mpg") || url.contains(".mpeg") || url.contains(".mpe") || url.contains(".mp4") || url.contains(".avi")) { 
    // Video files 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "video/*"); 
   }          

   //if you want you can also define the intent type for any other file 

   //additionally use else clause below, to manage other unknown extensions 
   //in this case, Android will show all applications installed on the device 
   //so you can choose which application to use 

   else { 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "*/*"); 
   } 

  }else {            
   if (url.contains(".doc") || url.contains(".docx")) { 
    // Word document 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/msword"); 
   } else if(url.contains(".pdf")) { 
    // PDF file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/pdf"); 
   } else if(url.contains(".ppt") || url.contains(".pptx")) { 
    // Powerpoint file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/vnd.ms-powerpoint"); 
   } else if(url.contains(".xls") || url.contains(".xlsx")) { 
    // Excel file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/vnd.ms-excel"); 
   } else if(url.contains(".rtf")) { 
    // RTF file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "application/rtf"); 
   } else if(url.contains(".wav")) { 
    // WAV audio file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "audio/x-wav"); 
   } else if(url.contains(".gif")) { 
    // GIF file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "image/gif"); 
   } else if(url.contains(".jpg") || url.contains(".jpeg")) { 
    // JPG file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "image/jpeg"); 
   } else if(url.contains(".txt")) { 
    // Text file 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "text/plain"); 
   } else if(url.contains(".mpg") || url.contains(".mpeg") || url.contains(".mpe") || url.contains(".mp4") || url.contains(".avi")) { 
    // Video files 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "video/*"); 
   }          

   //if you want you can also define the intent type for any other file 

   //additionally use else clause below, to manage other unknown extensions 
   //in this case, Android will show all applications installed on the device 
   //so you can choose which application to use 

   else { 
    intent = new Intent(Intent.ACTION_VIEW); 
    intent.setDataAndType(uri, "*/*"); 
   } 
  } 

  this.cordova.getActivity().startActivity(intent); 
 } 


 private void copy(String fileFrom, String fileTo) throws IOException { 
  // get file to be copied from assets 
  InputStream in = this.cordova.getActivity().getAssets().open(fileFrom); 
  // get file where copied too, in internal storage. 
  // must be MODE_WORLD_READABLE or Android can't play it 
  FileOutputStream out = this.cordova.getActivity().openFileOutput(fileTo, Context.MODE_WORLD_READABLE); 

  // Transfer bytes from in to out 
  byte[] buf = new byte[1024]; 
  int len; 
  while ((len = in.read(buf)) > 0) 
   out.write(buf, 0, len); 
  in.close(); 
  out.close(); 
 } 

 private boolean isYouTubeInstalled() { 
  PackageManager pm = this.cordova.getActivity().getPackageManager(); 
  try { 
   pm.getPackageInfo("com.google.android.youtube", PackageManager.GET_ACTIVITIES); 
   return true; 
  } catch (PackageManager.NameNotFoundException e) { 
   return false; 
  } 
 } 
}


Puis un petit HTML tout simple : 

<!doctype html> 
<html> 
<head> 
 <script type="text/javascript" charset="utf-8" src="cordova.js"></script> 
 
 <script type="text/javascript">
 //On déclare le plugin
 cordova.define("cordova/plugin/fileopener",
  function(require, exports, module) {
 var exec = require("cordova/exec");
 var FileOpener = function () {};

 FileOpener.prototype.open = function(url) {
  exec(null, null, "FileOpener", "openFile", [url]);
 };

 var fileOpener = new FileOpener();
 module.exports = fileOpener;

});
/**
 * Chargment du plugin
 */
if (!window.plugins) {
 window.plugins = {};
}
if (!window.plugins.fileOpener) {
 window.plugins.fileOpener =   cordova.require("cordova/plugin/fileopener");
}
</script>
</head> 
<body> 

<a href="javascript:readPDF(CHEMIN_FICHIER)">Mon PDF</a> 

</body> 
</html>
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