Downloading a document on android - android-studio

Question

I want to download documents from the links ive scraped on the web, i have a listview listener so when i press one of the item in the list it will return a url, ive set it up so getLink will be the link of the pdf file i want to download and set up filenametoo.
getLink = http://www.phivolcs.dost.gov.ph/images/Flyer-eq-and-eq-hazards.pdf
filename = Flyer-eq-and-eq-hazards.pdf
So i call this inside my listview listener and its suppose to download but its not working.
new DownloadFile().execute(getLink, filename);
I have errors like java.io.IOException: open failed: ENOENT (No such file or directory)
insideMain
private class DownloadFile extends AsyncTask<String, Void, Void>{
#Override
protected Void doInBackground(String... strings) {
String fileUrl = strings[0]; // -> getLink = http://www.phivolcs.dost.gov.ph/images/Flyer-eq-and-eq-hazards.pdf
String fileName = strings[1]; // -> Flyer-eq-and-eq-hazards.pdf
String extStorageDirectory = Environment.getDataDirectory().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;
}
}
downloadFile
package com.example.boneyflesh.homepage;
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.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)) > 0) {
fileOutputStream.write(buffer, 0, bufferLength);
}
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.boneyflesh.homepage">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" ></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme"
tools:ignore="AllowBackup">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="#string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="#string/title_activity_maps" />
<!--
ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information.
-->
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
<activity android:name=".GeohazardResults" />
<activity android:name=".MineralResults" />
<activity android:name=".LandformResults" />
<activity android:name=".Downloads"></activity>
</application>
EDIT
I called useFileAsyncTask(); then i received an error FATAL EXCEPTION: AsyncTask #1
Constructor
protected void useFileAsyncTask() {
DownloadFile task = new DownloadFile(this);
task.execute();
}
Asynktask
private class DownloadFile extends AsyncTask<String, Void, Void>{
private Context myContextRef;
public DownloadFile(Context context) {
myContextRef = context;
}
#Override
protected Void doInBackground(String... strings) {
//String fileUrl = strings[0]; // -> http://maven.apache.org/maven-1.x/maven.pdf
//String fileName = strings[1]; // -> maven.pdf
String extStorageDirectory = myContextRef.getFilesDir().toString();
//String extStorageDirectory = Environment.getDataDirectory().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(getLink, pdfFile);
return null;
}
}
downloadFile remains the same.

Answer 1

Change the line
String extStorageDirectory = Environment.getDataDirectory().toString();
to
String extStorageDirectory = context.getFilesDir().toString();
where context is the Context that you will need to supply to the AsyncTask.
Environment.getDataDirectory() is the system-wide user data directory where you may not create files while ontext.getFilesDir() is the data directory for your app where you may create files.