Android Downloading and Viewing a PDF File Example

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Android Downloading and Viewing a PDF File Example

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This tutorial is about downloading a pdf file and viewing it using an Android APP.

In this example we will be downloading the pdf file in the location http://maven.apache.org/maven-1.x/maven.pdf

Pre-Requiste
– Basic Android Knowledge
– Basic Java Knowledge

Sample 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”); // -> 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{

@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 = 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))>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













activity_main.xml


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