Develop Reference

How to properly extract files (out of memory)?

At start up of my app I want to extract my images (if they does not exists) from drawable folder to internal app folder to use later with FileProvider. Images have dimensions 2000*2000 and average size 380kb, format png.
Those images are not to be displayed (smaller ones are used to display). They are only for file sharing and I have to keep their original size.
I get out of memory at calling
Bitmap bm = BitmapFactory.decodeResource(getResources(), imageResID);
Code
private void extractImages() {
TypedArray imgs = getResources().obtainTypedArray(R.array.smile_list_share);
File imagePath = new File(getFilesDir(), "images");
File checkImage;
for (int i = 0; i < imgs.length(); i++) {
int imageResID = imgs.getResourceId(i, 0);
if (imageResID > 0) {
String name = getResources().getResourceEntryName(imageResID);
checkImage = new File(imagePath, name + ".png");
if (!checkImage.exists()) {
Bitmap bm = BitmapFactory.decodeResource(getResources(), imageResID);
boolean b = saveBitmapToFile(imagePath, name + ".png", bm, Bitmap.CompressFormat.PNG, 100);
Log.e("mcheck","saved "+b+", file "+name);
Log.e("mcheck", "file does not exists " + name);
} else {
Log.e("mcheck", "file exists " + name);
}
} else {
Log.e("mcheck", "ERROR " + i);
}
}
imgs.recycle();
}
public boolean saveBitmapToFile(File dir, String fileName, Bitmap bm,
Bitmap.CompressFormat format, int quality) {
File imageFile = new File(dir, fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(imageFile);
bm.compress(format, quality, fos);
bm.recycle();
fos.close();
return true;
} catch (IOException e) {
Log.e("app", e.getMessage());
if (fos != null) {
try {
fos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
return false;
}

You have to call recycle on your bitmap object everytime you are done with it.
Here is a good guide on how to manipulate bitmaps efficiently
https://developer.android.com/training/displaying-bitmaps/load-bitmap.html

I found that I dont need to create bitmap object at all. It is possible to obtaine intput stream from getResourses directly.
public boolean saveBitmapToFile(File dir, String fileName, int imageResourse) {
File imageFile = new File(dir, fileName);
FileOutputStream fos = null;
InputStream inputStream = null;
try {
fos = new FileOutputStream(imageFile);
inputStream = getResources().openRawResource(imageResourse);
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
fos.write(buffer, 0, len);
}
inputStream.close();
fos.close();
return true;
} catch (IOException e) {
Log.e("app", e.getMessage());
if (fos != null) {
try {
fos.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
return false;
}

write an image to external storage in android

I use following code to write an image to external storage in android :
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File (root.getAbsolutePath() + "/download");
dir.mkdirs();
fileName = "image_2.jpeg";
File file = new File(dir, fileName);
try {
FileOutputStream outStream = new FileOutputStream(file);
Bitmap bitmap = BitmapFactory.decodeFile("android.resource://com.mypackage.com/drawable/image_1");
bitmap.compress(Bitmap.CompressFormat.JPEG, 70, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
This code is for reading image_1.jpg from drawable folder, then writing it to download folder in external storage, with image_2.jpeg name. (create download folder in external storage and a file with image_2.jpeg name inside that folder).
This code will produce an ((force close)). download folder is created and also the image_2.jpeg is created, but image image_2.jpeg is corrupted.

These images in drawable folder can be accessed by BitmapFactory, you can save the bitmap to PNG or JPG.
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
File sd = Environment.getExternalStorageDirectory();
String fileName = "test.png";
File dest = new File(sd, fileName);
try {
FileOutputStream out;
out = new FileOutputStream(dest);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Don't forget to add android.permission.WRITE_EXTERNAL_STORAGE permission.
For other type of images, I think put them into assets folder is a better way.
There is a sample here.

I did same thing with this code.Try this code:
String[] sampleImagesName = { "image2" };
int[] sampleImages = { R.drawable.image1};
File file;
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
file = new File(Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/download");
if (!file.exists()) {
file.mkdirs();
SaveSampleToSD();
}
}
private void SaveSampleToSD() {
String path = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/download";
for (int i = 0; i < sampleImages.length; i++) {
try {
File f = new File(path + "/", sampleImagesName[i] + ".jpg");
Bitmap bm = BitmapFactory.decodeResource(getResources(),
sampleImages[i]);
FileOutputStream out = new FileOutputStream(f);
bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
Log.e("ImageSaved---------", "saved");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

import/export to android sqlite database

Ive seen a few posts on how to import and export a database in android and i found these code, but i cant seem to make it work. I get the error java.io.filenotfoundexception /storage/sdcard0/BackupFolder/DatabaseName:open failed ENOENT (no such file or directory). Ive changed a few things but i still get no file found exception
here is my export:
private void exportDB() {
try {
db.open();
File newFile = new File("/sdcard/myexport");
InputStream input = new FileInputStream(
"/data/data/com.example.mycarfuel/data
bases/MyDatabase");
OutputStream output = new FileOutputStream(newFile);
byte[] buffer = new byte[1024];
int length;
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
output.flush();
output.close();
input.close();
db.close();
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
and my import:
private void importDB() {
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//" + "PackageName"
+ "//databases//" + "DatabaseName";
String backupDBPath = "/BackupFolder/DatabaseName
";
File backupDB = new File(data, currentDBPath);
File currentDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getBaseContext(), backupDB.toString(),
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
.show();
}
}

SQlite database to our local file system-
Function declaration-
try {
backupDatabase();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Function defined-
public static void backupDatabase() throws IOException {
//Open your local db as the input stream
String inFileName = "/data/data/com.myapp.main/databases/MYDB";
File dbFile = new File(inFileName);
FileInputStream fis = new FileInputStream(dbFile);
String outFileName = Environment.getExternalStorageDirectory()+"/MYDB";
//Open the empty db as the output stream
OutputStream output = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = fis.read(buffer))>0){
output.write(buffer, 0, length);
}
//Close the streams
output.flush();
output.close();
fis.close();
}

Above accepted answer will not work for Android version on or above 6 because database path is different.
please check below code . It will work on all devices.
public static boolean exportDB(Context context) {
String DATABASE_NAME = "my.db";
String databasePath = context.getDatabasePath(DATABASE_NAME).getPath();
String inFileName = databasePath;
try {
File dbFile = new File(inFileName);
FileInputStream fis = new FileInputStream(dbFile);
String outFileName = Environment.getExternalStorageDirectory() + "/" + DATABASE_NAME;
OutputStream output = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = fis.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
//Close the streams
output.flush();
output.close();
fis.close();
return true;
} catch (Exception e) {
return false;
}
}

How to save image in specific sd card folder with using current time and data format in android?

I want to save a captured image in an SD-card specific folder with current time mills name of the image.
How can I do this?

try this after getting the bitmap object
private void save_Image_to_sdcard() {
// TODO Auto-generated method stub
OutputStream file_outputstream = null;
InputStream in = null;
try {
URL path = new URL(url);
in = path.openStream();
String path1 =
Environment.getExternalStorageDirectory().toString();
System.out.println(path1+ " " +user_file_name);
// /mnt/sdcard
File f = new File(path1 + "/"+System.currentTimeMillis()+".png");
f.createNewFile();
System.out.println("file created " + f.toString());
file_outputstream = new FileOutputStream(f);
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = in.read(buffer, 0, buffer.length)) >= 0) {
file_outputstream.write(buffer, 0, bytesRead);
}
file_outputstream.close();
in.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.v("hey", "error");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.v("hey", " ioexception");
}
}

Save file as following way,
fileName + DateFormat.format( ConstantCodes.dd_MMM_yyyy_kk_mm_ss ,new java.util.Date()).toString() + ".jpg";

private Uri saveToFileAndUri() throws Exception{
long currentTime = System.currentTimeMillis();
String fileName = "MY_APP_" + currentTime+".jpg";
File extBaseDir = Environment.getExternalStorageDirectory();
File file = new File(extBaseDir.getAbsoluteFile()+"/MY_DIRECTORY");
if(!file.exists()){
if(!file.mkdirs()){
throw new Exception("Could not create directories, "+file.getAbsolutePath());
}
}
String filePath = file.getAbsolutePath()+"/"+fileName;
FileOutputStream out = new FileOutputStream(filePath);
bitmap.compress(Bitmap.CompressFormat.JPEG, JPEG_QUALITY, out); //control the jpeg quality
out.flush();
out.close();
long size = new File(filePath).length();
ContentValues values = new ContentValues(6);
values.put(Images.Media.TITLE, fileName);
// That filename is what will be handed to Gmail when a user shares a
// photo. Gmail gets the name of the picture attachment from the
// "DISPLAY_NAME" field.
values.put(Images.Media.DISPLAY_NAME, fileName);
values.put(Images.Media.DATE_ADDED, currentTime);
values.put(Images.Media.MIME_TYPE, "image/jpeg");
values.put(Images.Media.ORIENTATION, 0);
values.put(Images.Media.DATA, filePath);
values.put(Images.Media.SIZE, size);
return ThisActivity.this.getContentResolver().insert(Images.Media.EXTERNAL_CONTENT_URI, values);
}

save audio file in raw or assets folder to sdcard android

Hi guys i am having a audio file in assets folder and i need to save the same file onto sdcard .
How to acheive this.
Below is the code i am using to save file
String filename = "filename.txt";
File file = new File(Environment.getExternalStorageDirectory(), filename);
FileOutputStream fos;
byte[] data = new String("data to write to file").getBytes();
try {
fos = new FileOutputStream(file);
fos.write(data);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
// handle exception
} catch (IOException e) {
// handle exception
}
please help

try this
AssetManager mngr = getAssets();
InputStream path = mngr.open("music/music1.mp3");
BufferedInputStream bis = new BufferedInputStream(path,1024);
//get the bytes one by one
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
}
byte[] bitmapdata = baf.toByteArray();
After converting into byte array copy this into the sdcard as follows
File file = new File(Environment.getExternalStorageDirectory(), music1.mp3);
FileOutputStream fos;
try {
fos = new FileOutputStream(file);
fos.write(bitmapdata );
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
// handle exception
} catch (IOException e) {
// handle exception
}