Develop Reference

Adding large file manually inside the project in android studio

My project is all about media player. I want to store manually hundreds of mp3 files in my project but the problem is I don't know where I can put the large file which is the file size is 300MB into my project. I already search many times on google but the answer is always putting the file into ExternalDirectory by using this code.
File file = new File(getExternalFilesDir(null)+"/");
The problem of this code is you can only store a file to this directory once you downloaded the file. Since my project is an offline app, I don't need an internet connection to it
Here is my first attempt.
I put my one mp3 file to asset folder which is the size is 5mb and make a copy to another directory
File file = new File(getExternalFilesDir(null)+"/newFile.mp3"); please take a look below.
private void copyFile() {
InputStream inputStream;
try {
inputStream = getAssets().open("raw/original.mp3");
File file = new File(getExternalFilesDir(null)+"/newFile.mp3");
OutputStream outputStream = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer,0,length);
}
outputStream.flush();
outputStream.close();
inputStream.close();
Log.d(TAG, "copyFile: copied ");
} catch (IOException e) {
e.printStackTrace();
}
}
the code above works fine. I can see that the file was successfully copied but the problem is during my research they said that asset folder or res/raw folder has a storage limit it means that I can only store a file in asset folder with a file size less than 5MB (I am not sure).
My question is what is the best way to manually store mp3 files (300MB) to my project(without downloading the files)?
Thanks and advance.

Android SQLite image Storage

I am making a quiz app which requires me to be able to get an image from a database BLOB or image path stored in the database. However i have looked around and a lot of people suggest using a file path, the problem is i don't know where to store the image if i use the file path method.
Do i store it somewhere in the app such as the resources folder?, a lot of examples use SD cards but is it possible to save an image to SD card from a database and if so surely that would mean i have two images one in database and one on SD card.
Where is the best place to store a images for a quiz app that i can use on any phone an will have access to said images? and how ?.
Thanks in advance.

Image storage must be performed in some directory and the corresponding paths of the image must be stored in the database.
There will be times when you will accessing your images from one acivity then the other, in that case you will just need to pass the path of the image from activity one to activity two and then retrieve the image from the directory to display in activity two.
Image storing and loading from databases may turn out to be a pain when the size of the images will start increasing.
For learning how to store images, Give an eye to this
CODE EXAMPLE
private void SaveImage(Bitmap finalBitmap) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
In the above code, the line
Environment.getExternalStorageDirectory()
is refering to android/data folder. you can create folder inside upto any level, like android/data/folderone/folderTwo/folderThree
.
Note: However you need to first fetch the images from server for the first time and store them in device.If you are thinking of bundling up the images along with the app, put all of your images in res/drawable folders.(if no web server functionality is involved)

How to download file into data/data/com.****.*** folder and open it

I need to download some pdf files into data/data/com.**.* folder.
Those files are application specific and only application should read and display it that's the reason storing on data/data/com.**.* folder.
Please let me know how to download into that folder and open/read it in the application.
I know how to download it into SD card, but I do not have idea to downloading to application specific folder.
Please let me know some code examples to do this and also I need to know the capacity/size of the data/data/com.**.* folder.

As long as you want write your own applications Data folder, you can create a FileOutputStream like this FileOutputStream out = new FileOutputStream("/data/data/com.**.*/somefile"); than use that output stream to save file. Using the same way you can create a FileInputStream and read the file after.
You will get Permission Denied if you try to access another application's data folder.
I am not sure for capacity but you can calculate the size of the data folder using this
File dataFolder = new File("/data/data/com.**.*/");
long size = folderSize(dataFolder);
...
public static long folderSize(File directory) {
long length = 0;
for (File file : directory.listFiles()) {
if (file.isFile())
length += file.length();
else
lengthlong += folderSize(file);
}
return length;
}

Hi here i am attaching the link of a tutorial explained.
http://www.mysamplecode.com/2012/06/android-internal-external-storage.html
and there are many discussions going on internet that you should root your phone in order to access the data from data/data folder and I am also attaching some links about the discussion, I hope these are also some of the links that are related to your question
where do i find app data in android
How to access data/data folder in Android device?
and as well as some links that makes out the things without rooting your phone i mean
You can get access to /data/data/com*.* without rooting the device
http://denniskubes.com/2012/09/25/read-android-data-folder-without-rooting/

To Write file
FileOutputStream out = new FileOutputStream("/data/data/your_package_name/file_name.xyz");
To Read file
FileInputStream fIn = new FileInputStream(new File("/data/data/your_package_name/file_name.xyz"));
Now you have your input stream , you can convert it in your file according to the file type .
I am giving you example if your file is contain String data the we can do something like below ,
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String mDataRow = "";
String mBuffer = "";
while ((mDataRow = myReader.readLine()) != null) {
mBuffer += mDataRow + "\n";
}
Remember to add write file permission to AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

where to store xml updates in packaged android app?

I guess I'm a little confused as to how files are stored on an actual machine (or emulator even).
While programming, I can save my xml file in the assets folder manually, but how to write an app that will have to connect to the network and download the file,save it somewhere and then manipulate it ? where will it store said file ?
I want to create a new file, but I read on another post that the assets folder as such is not available once packaged; So where are they created and stored ? How can they be transferred. Its just, I'm new to this platform and the file system is a little confusing.

If you want to use XML that is updated, you should think of copying the file(s) from assets to device storage. You can take a look at How to copy files from 'assets' folder to sdcard? to know how this can be done.
Another alternative is to use the database where you can store the parsed data from the XML. So that you need not parse the file whenever you need to access the contents.

You have two options: call getFilesDir() from your activity to obtain a path to the internal data folder that can only be read/write from your app.
Or, you can write/read your xml file to external storage (SD Card). Use the method Environment.getExternalStorageDirectory() to get the root path of the external storage, then create your own folder as you see fit.
Note that if you write to external storage, every app in the phone will have access to it.

Even I faced this issue. Now I have a xml file which is has application properties.This is packaged in the assets folder.Once packaged we cannot edit a file in assets folder.
Now on app load I just copy this file to path returned by
context.getFilesDir().getAbsolutePath();
And the application edit it from the same place. You can see if the file is modified in the FileExplorer panel of DDMS view. The file is stored in the folder named same as your application package name for eg: com.abhi.maps
Alternatively you can also copy it to SD card.However it is risky because, sd card may bot be available all the time.
You can use the following code to copy file from assets folder:
private static void copyFile(String filename, Context context) {
AssetManager assetManager = context.getAssets();
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(filename);
String newFileName = context.getFilesDir() + "/" + filename;
out = new FileOutputStream(newFileName);
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());
}
}
Hope it helps! :)

How to save images in Android?

I'm very new to Android programming and I was wondering how can I make an app take a picture and save the image to the internal storage of a device, not to the SD card, because not everyone will have an SD card.

You can try saving it as an sqlite blob. This this thread for how to do the storage. Saying "not everyone will have external storage" is a bad excuse: you should handle both cases. If instead you want to implement it as a file (a perfectly good way to do it), you can look up an external storage directory using the Environment.getExternalStorageDir() call to determine a suitable directory in which to store your files. Read the API documentation here and heed the following note:
Note: don't be confused by the word "external" here. This directory can better be thought as media/shared storage. It is a filesystem that can hold a relatively large amount of data and that is shared across all applications (does not enforce permissions). Traditionally this is an SD card, but it may also be implemented as built-in storage in a device that is distinct from the protected internal storage and can be mounted as a filesystem on a computer.

Yes, you can try to save images in sqlite blob fields. It's just a java way: and let the whole world wait :)
It's a good practice to store all your files, cache etc into /Android/data/<package_name>/files/ directory on external storage. External storage is not the only SD cards and you can get external storage path and state by Environment.getExternalStorageDirectory() and Environment.getExternalStorageState() calls (reference). If you are using API 8 or greater, you can use Context.getExternalFilesDir().
If you would like to get user's hate-rays, you can try to store files and folders in the root of external storage.

Perhaps something like this
Bitmap largeBitmap ; // save your Bitmap from data[]
FileOutputStream fileOutputStream = null;
BufferedOutputStream bos = null;
int quality = 100;
String filePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator + "myImage.jpg"
File mediaFile = new File(filePath);
try {
fileOutputStream = new FileOutputStream(pictureFile);
bos = new BufferedOutputStream(fileOutputStream);
bitmap.compress(CompressFormat.JPEG, quality, bos);
return pictureFile;
} finally {
if (bos != null) {
try {
bos.close();
} catch (IOException e) {
// ignore close error
}
}