Develop Reference

How do I address files in Asset folder?

I need to read "strings.json" file that lies in the "assets" folder of my Android project. But
File file = new File(filepath);
Logger.e(file.exists() ? "exists" : "doesn't exist");
says that the file doen't exist. I've tried the following variants of the filepath:
strings.json
android_asset/strings.json
/android_asset/strings.json
file:///android_asset/strings.json
What's wrong?

For read files in Assets:
InputStream is = context.getAssets().open("strings.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
fileResult = new String(buffer, "UTF-8");
In fileResult you should retrieve the content of your file.

AssetManager manager = getAssets();
try {
InputStream stream = manager.open(string+".xml");
} catch (IOException e) {
e.printStackTrace();
}

How to load a file from assets folder of my android test project?

Is there a way to get the file object of one of the files which are inside the assets folder. I know how to load the inputstream of such a file, but i need to have a file object instead of the inputstream.
This way i load the inputstream
InputStream in2 = getInstrumentation().getContext().getResources().getAssets().open("example.stf2");
But I need the file object, this way the file will not be found
File f = new File("assets/example.stf2");

Found a soltion which works in my case, mabye someone else can use this as well.
Retrieving the file from my android test project to an inputstream
InputStream input = getInstrumentation().getContext().getResources().getAssets().open("example.stf2");
Create a file on the External-Cachedir of the android application under test
File f = new File(getInstrumentation().getTargetContext().getExternalCacheDir() +"/test.txt");
Copy the inputstream to the new file
FileUtils.copyInputStreamToFile(input, f);
Now I can use this file for my further tests

try below code:-
AssetManager am = getAssets();
InputStream inputStream = am.open(file:///android_asset/myfoldername/myfilename);
File file = createFileFromInputStream(inputStream);
private File createFileFromInputStream(InputStream inputStream) {
try{
File f = new File(my_file_name);
OutputStream outputStream = new FileOutputStream(f);
byte buffer[] = new byte[1024];
int length = 0;
while((length=inputStream.read(buffer)) > 0) {
outputStream.write(buffer,0,length);
}
outputStream.close();
inputStream.close();
return f;
}catch (IOException e) {
//Logging exception
}
return null;
}
for more info see below link :-
How to pass a file path which is in assets folder to File(String path)?

mp3 not saving to sd correctly; how to save mp3 to sd card?

I've been looking at this site for the past 3 or so hours. How to copy files from 'assets' folder to sdcard?
This is the best I could come up with because I'm only trying to copy one file at a time.
InputStream in = null;
OutputStream out = null;
public void copyAssets() {
try {
in = getAssets().open("aabbccdd.mp3");
File outFile = new File(root.getAbsolutePath() + "/testf0lder");
out = new FileOutputStream(outFile);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch (IOException e) {
Log.e("tag", "Failed to copy asset file: ", e);
}
}
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);
}
}
I've figured out how to create a file and save a text file. http://eagle.phys.utk.edu/guidry/android/writeSD.html
I would rather save an mp3 file to the sdcard rather than a text file.
When I use this code I provided, I get a text document that same size as the aabbccdd.mp3 file. It does not create a folder and save an .mp3 file. It saves a text document in the root folder. When you open it, I see a whole bunch of chinese letters, but at the top in English I can see the words WireTap. WireTap Pro was the program I used to record the sound so I know the .mp3 is passing through. It's just not creating a folder and then saving a file like the above .edu example.
What should I do?

I think you should do something like that -[Note: this i used for some other formats not mp3 but its works on my app for multiple format so i hope it will work for u too.]
InputStream in = this.getAssets().open("tmp.mp3"); //give path as per ur app
byte[] data = getByteData(in);
Make sure u have the folder already exists on path, if folder is not there it will not save content correctly.
byteArrayToFile(data , "testfolder/tmp.mp3"); //as per ur sdcard path, modify it.
Now the methods ::
1) getByteData from inputstream -
private byte[] getByteData(InputStream is)
{
byte[] buffer= new byte[1024]; /* or some other number */
int numRead;
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
try{
while((numRead = is.read(buffer)) > 0) {
bytes.write(buffer, 0, numRead);
}
return bytes.toByteArray();
}
catch(Exception e)
{ e.printStackTrace(); }
return new byte[0];
}
2) byteArrayToFile
public void byteArrayToFile(byte[] byteArray, String outFilePath){
FileOutputStream fos;
try {
fos = new FileOutputStream(outFilePath);
fos.write(byteArray);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}

how to read .pdf file in assets folder

File file = new File("android.resource://com.baltech.PdfReader/assets/raw/"+filename);
if (file.exists()) {
Uri targetUri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(targetUri, "application/pdf");
try {
startActivity(intent);
}
catch (ActivityNotFoundException e) {
Toast.makeText(PdfReaderActivity.this, "No Application Available to View PDF", Toast.LENGTH_SHORT).show();
}
i want to read .pdf file which is in assets folder. what path i hav to give in filename. plz help. Thanks

I'm not sure if you got an answer to this already, seems pretty old, but this worked for me.
//you need to copy the input stream to a new file, so store it elsewhere
//this stores it to the sdcard in a new folder "MyApp"
String filename = Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyApp/solicitation_form.pdf";
AssetManager assetManager = getAssets();
try {
InputStream pdfFileStream = assetManager.open("solicitation_form.pdf");
CreateFileFromInputStream(pdfFileStream, filename);
} catch (IOException e1) {
e1.printStackTrace();
}
File pdfFile = new File(filename);
The CreateFileFromInputStream function is as follows
public void CreateFileFromInputStream(InputStream inStream, String path) throws IOException {
// write the inputStream to a FileOutputStream
OutputStream out = new FileOutputStream(new File(path));
int read = 0;
byte[] bytes = new byte[1024];
while ((read = inStream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
inStream.close();
out.flush();
out.close();
}
Really hope this helps anyone else who reads this.

File file = new File("file:///android_asset/raw/"+filename);
replace the above line with below and try..
File file = new File("android.resource://com.com.com/raw/"+filename);
and place your PDF file raw folder instead of asset. Also change com.com.com with your package name.

Since assets files are stored inside apk file, there is no absolute path of the assets folder.
You might use a workaround creating a new file used as a buffer.
You should use AssetManager:
AssetManager mngr = getAssets();
InputStream ip = mngr.open(<filename in the assets folder>);
File assetFile = createFileFromInputStream(ip);
private File createFileFromInputStream(InputStream ip);
try{
File f=new File(<filename>);
OutputStream out=new FileOutputStream(f);
byte buf[]=new byte[1024];
int len;
while((len=inputStream.read(buf))>0)
out.write(buf,0,len);
out.close();
inputStream.close();
}catch (IOException e){}
}
}

Android: How to create a directory on the SD Card and copy files from /res/raw to it?

I am trying to create a folder and several subdirectory within it on the SD Card... I then want to transfer files that I have stored in /res/raw to that folder... I addition, I want this to only happen once, the first time the program is ever run. I realize that this is ridiculously open-ended, and that I am asking a lot... but any help would be greatly appreciated.

This will copy all files in the "clipart" subfolder of the .apk assets folder to the "clipart" subfolder of your app's folder on the SD card:
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
String basepath = extStorageDirectory + "/name of your app folder on the SD card";
//...
// in onCreate
File clipartdir = new File(basepath + "/clipart/");
if (!clipartdir.exists()) {
clipartdir.mkdirs();
copyClipart();
}
private void copyClipart() {
AssetManager assetManager = getResources().getAssets();
String[] files = null;
try {
files = assetManager.list("clipart");
} catch (Exception e) {
Log.e("read clipart ERROR", e.toString());
e.printStackTrace();
}
for(int i=0; i<files.length; i++) {
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open("clipart/" + files[i]);
out = new FileOutputStream(basepath + "/clipart/" + files[i]);
copyFile(in, out);
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(Exception e) {
Log.e("copy clipart ERROR", e.toString());
e.printStackTrace();
}
}
}
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);
}
}

I experienced a similar problem when using mkdirs(), however because running the command:
mkdir one/two
fails on Linux, then the method http://download.oracle.com/javase/1.4.2/docs/api/java/io/File.html#mkdirs() subsequently fails too. I guess this means there is no way to use mkdirs on Android? My (probably rather hacky) work-around was to create each necessary directory separately:
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
new File(extStorageDirectory + "/one/").mkdirs();
new File(extStorageDirectory + "/one/two/).mkdirs();