Develop Reference

Android read pdf file from asset folder

I try to read a pdf file store in the assets folder. I see this solution :
Read a pdf file from assets folder
But like comments say this it's not working anymore, the file cannot be found, is there another solution for read a pdf file directly, without copy pdf in external storage ?
And I don't want to use PdfRenderer my minimal API is 17

Maybe this can be helpful for somebody so I post my answer :
private void openPdf(String pdfName){
AssetManager assetManager = getAssets();
InputStream in = null;
OutputStream out = null;
File file = new File(getFilesDir(), pdfName);
try
{
in = assetManager.open(pdfName);
out = openFileOutput(file.getName(), Context.MODE_WORLD_READABLE);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1)
{
out.write(buffer, 0, read);
}
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (Exception e)
{
Log.e("tag", e.getMessage());
}
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(
Uri.parse("file://" + getFilesDir() + "/"+pdfName),
"application/pdf");
startActivity(intent);
}
The pdf file is store inside the assets folder

Reading data from downloaded .txt file downloaded multiple times in Android app

I'm developing an app in which I'm sending a .txt file from one end by attaching it with gmail. Everytime this file is sent, its name is data.txt. When this file is downloaded at the other end, on the first download its name is the same, i.e. data.txt. However, when another file is sent with the same name, the name of the file at the receiveing end becomes data-1.txt, data-2.txt etc. And because of this, I'm not able to read the proper file. Please could someone give me some suggestions to solve this problem? The sending and receiving code is given below: SEND
bSend.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String fileName = "data";
String toWrite = enterText.getText().toString();
FileOutputStream fos;
try {
String path = Environment.getExternalStorageDirectory().toString();
Log.v("path", path);
File myFile = new File("" + path + "/" + fileName + ".txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(toWrite);
Log.v("file written", toWrite);
myOutWriter.close();
fOut.close();
Uri u1 = null;
u1 = Uri.fromFile(myFile);
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "MPPT Configuration Data");
sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
sendIntent.setType("text/html");
startActivity(sendIntent);
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
READ:
bRead.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String fileName = "data";
StringBuffer stringBuffer = new StringBuffer();
String aDataRow = "";
String aBuffer = "";
try {
File myFile = new File("/storage/sdcard0/download/" + fileName + ".txt");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
myReader.close();
Log.v("read data", "" + aBuffer);
tvData.setText(aBuffer);
}catch (IOException e2) {
e2.printStackTrace();
}
}
});

I found a possible solution. I can link the file manager (external app) from where the user can pick out whichever file he wants to be read.
Thanks #greenapps fir the idea of displaying a list of files.

You can get all the file by using regex ,then process the file by following way:
1.if only one file found,read it;
2.if more than one file found, compare and read the file which last number is biggest
but this solution still has one problem,if has file data.txt and data-3.txt ,the file we want to read may become data-2.txt,but what we really read is data-3.txt.
Or,maybe you can get the file you want by judging file established time.

Android Reading PDF files from asstes folder

I have list of PDF files need to Place in asstes folder,my requirement is to read files from asstes and display it inside a listview.
if we click on each list item need to read respective PDF file
I have followed this blog http://androidcodeexamples.blogspot.in/2013/03/how-to-read-pdf-files-in-android.html
But here they have given reading a PDF files from External Storage Directory
I want to implement the same reading files from Asstes Folder
Could any one help How to implement the same example reading files from asstes?

You cannot open the pdf file directly from the assets folder.You first have to write the file to sd card from assets folder and then read it from sd card.
Try out the below code to copy and read the file from assets folder:
//method to write the PDFs file to sd card
private void PDFFileCopyandReadAssets()
{
AssetManager assetManager = getAssets();
InputStream in = null;
OutputStream out = null;
File file = new File(getFilesDir(), "test.pdf");
try
{
in = assetManager.open("test.pdf");
out = openFileOutput(file.getName(), Context.MODE_WORLD_READABLE);
readFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (Exception e)
{
Log.e("tag", e.getMessage());
}
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(
Uri.parse("file://" + getFilesDir() + "/test.pdf"),
"application/pdf");
startActivity(intent);
}
private void readFile(InputStream in, OutputStream out) throws IOException
{
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1)
{
out.write(buffer, 0, read);
}
}
Open the file from sdcard as below:
File file = new File("/sdcard/test.pdf");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),"application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
Also provide a permission to write into your external storage in your manifest.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

How to read PDF file saved to internal storage of device?

I am using following code to download and read a PDF file from internal storage on device.
I am able to download the files successfully to the directory:
data/data/packagename/app_books/file.pdf
But I am unable to read the file using a PDF reader application like Adobe Reader.
Code to download file
//Creating an internal dir;
File mydir = getApplicationContext().getDir("books", Context.MODE_WORLD_READABLE);
try {
File file = new File(mydir, outputFileName);
URL downloadUrl = new URL(url);
URLConnection ucon = downloadUrl.openConnection();
ucon.connect();
InputStream is = ucon.getInputStream();
FileOutputStream fos = new FileOutputStream(file);
byte data[] = new byte[1024];
int current = 0;
while ((current = is.read(data)) != -1) {
fos.write(data, 0, current);
}
is.close();
fos.flush();
fos.close();
isFileDownloaded=true;
} catch (IOException e) {
e.printStackTrace();
isFileDownloaded = false;
System.out.println(outputFileName + " not downloaded");
}
if (isFileDownloaded)
System.out.println(outputFileName + " downloaded");
return isFileDownloaded;
Code to read the file
PackageManager packageManager = getPackageManager();
Intent testIntent = new Intent(Intent.ACTION_VIEW);
testIntent.setType("application/pdf");
List list = packageManager.queryIntentActivities(testIntent,
PackageManager.MATCH_DEFAULT_ONLY);
try {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
File fileToRead = new File(
"/data/data/com.example.filedownloader/app_books/Book.pdf");
Uri uri = Uri.fromFile(fileToRead.getAbsoluteFile());
intent.setDataAndType(uri, "application/pdf");
startActivity(intent);
} catch (Exception ex) {
Log.i(getClass().toString(), ex.toString());
Toast.makeText(MainActivity.this,
"Cannot open your selected file, try again later",
Toast.LENGTH_SHORT).show();
}
All works fine but the reader app says "File Path is not valid".

Your path is only valid for your app. Place the file in a place where other apps can 'see' it. Use GetExternalFilesDir() or getExternalStorageDirectory().

Note about files which are created inside the directory created by Context.getDir(String name, int mode) that they will only be accessible by your own application; you can only set the mode of the entire directory, not of individual files.
So you can use Context.openFileOutput(String name, int mode). I'm re-using your code for an example:
try {
// Now we use Context.MODE_WORLD_READABLE for this file
FileOutputStream fos = openFileOutput(outputFileName,
Context.MODE_WORLD_READABLE);
// Download data and store it to `fos`
// ...
You might want to take a look at this guide: Using the Internal Storage.

If you would like to keep the file app specific, you can use PdfRenderer available for Lollipop and above builds. There are great tutorials on google and youtube that work well. The method you are using is a secure way to store a PDF file that is only readable from inside the app ONLY. No outside application like Adobe PDF Reader will be able to even see the file.It took me a lot of seaching but I found a solution to my specific usage by using this site and especially youtube.

How to download PDF file from asset folder to storage by making folder
make sure you have storage permission are given like marshmallow device support etc then follow these steps
private void CopyReadAssets()
{
AssetManager assetManager = getContext().getAssets();
FileInputStream in = null;
FileOutputStream out = null;
File sdcard = Environment.getExternalStorageDirectory();
File dir = new File(Environment.getExternalStorageDirectory()+File.separator+ "A_level");
File dir2;
if (dir.exists() && dir.isDirectory()){
Log.e("tag out", ""+ dir);
}else {
dir.mkdir();
Log.e("tag out", "not exist");
}
File file = new File(dir, mTitle+".pdf");
try
{
Log.e("tag out", ""+ file);
out = new FileOutputStream(file);
in = new FileInputStream (new File(mPath));
Log.e("tag In", ""+ in);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (Exception e)
{
Log.e("tag out", ""+ out);
Log.e("tag In", ""+ in);
Log.e("tag", e.getMessage());
Log.e("tag", ""+file);
Log.i("tag",""+sdcard.getAbsolutePath() + "A_level");
}
}
private void copyFile(InputStream in, OutputStream out) throws IOException
{
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1)
{
out.write(buffer, 0, read);
}
}

Android - Share file from sd using bluetooth

Im trying to send a file from my SD using Bluetooth. I'm using Share intent, I wanna send a file from my SD (.mp3). ok when I open the share menu, I can send file to email, dropbox, whatsapp, but if I select Bluetooth, My device shows a message "File null was not sent to ..."
My steps are:
1. Create SEND intent.
2. Copy my file from res/raw to SD
3. Add my file to putExtra
4. Delete the file (is temporal file)
The code:
Intent shareIntent=new Intent(android.content.Intent.ACTION_SEND);
shareIntent.setType("audio/mp3");
//Copiamos archivo a compartir en la sd
String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = sonidoActual+"-temp.mp3";
File newSoundFile = new File(baseDir, fileName);
try {
byte[] readData = new byte[1024*500];
InputStream fis = getResources().openRawResource(contexto.getResources().getIdentifier(sonidoActual,"raw", contexto.getPackageName()));
FileOutputStream fos = new FileOutputStream(newSoundFile);
int i = fis.read(readData);
while (i != -1) {
fos.write(readData, 0, i);
i = fis.read(readData);
}
fos.close();
} catch (IOException io) {
}
////
shareIntent.putExtra(Intent.EXTRA_STREAM,Uri.parse(newSoundFile.getAbsolutePath())/*Uri.parse("file:///sdcard/"+fileName)*//*Uri.parse("android.resource://com.genaut.instantbuttonsfreak/raw/"+texto)*/);
startActivity(Intent.createChooser(shareIntent,getString(R.string.share)));
//
newSoundFile.delete();
Anybody can help me with this? I read a lot but not found a working method, sorry my english.

I think your file is not release by File-I/O.
SO.. try flush() the FileOutPutStream.. like,
fos.flush();
fos.close();
then, use Uri.fromFile(File file) for uri to pass with Intent.. But before passing Uri to Intent just check whether file is exist or not..
like,
if(newSoundFile.exist())
{
shareIntent.putExtra(Intent.EXTRA_STREAM,Uri.fromFile(newSoundFile))
startActivity(Intent.createChooser(shareIntent,getString(R.string.share)));
newSoundFile.delete();
}