Develop Reference

Store Images from web into folder and read from it

I would like to know what is best way to store images from internet in folder and read from folder because later on I will need to show them in gallery. Should I store them to external or internal storage, should I give user option to choose storage if his memory is low or? Also how should I optimize it so it doesn't take too much space. Generally I need some idea how to make it fast, stable and optimized for devices with no memory card.

in your Oncreate() method
getBitmapFromURL(data);
where data is the image url.
then
public Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
URLConnection connection = (URLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(input);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
String filename;
Date date = new Date(0);
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
filename = sdf.format(n);
File myDir=new File("/sdcard/Pictures");
myDir.mkdirs();
String fname = "Image-"+ n +".jpg";
// filename = sdf.format(date);
File file = new File(myDir, fname);
if (file.exists ()) file.delete ();
try {
file.createNewFile();
FileOutputStream fo = new FileOutputStream(file);
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
Toast.makeText(getApplicationContext(),"Saved to Light Box",Toast.LENGTH_LONG).show();
// 5
fo.write(bytes.toByteArray());
fo.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}

Downloading and Playing mp3 file into internal storage

We are working on android application,in which mp3 files should be downloaded into internal storage in a background service. We have implemented this using with code snippet mentioned below inside an intent service,But when we try to play the mp3 we are getting an error,like player is not supporting this audio file. If any one has a solution for this issue,Please advise me for the same.
Code Snippet:
String urlPath = intent.getStringExtra(URL);
String fileName = intent.getStringExtra(FILENAME);
// String fileName = Environment.getExternalStorageDirectory().toString() + "/trail.mp3";
File output = new File(Environment.getExternalStorageDirectory(),
fileName);
File dir = new File(output.getAbsolutePath()
+ "/TRIALS/");
dir.mkdirs();
String path = dir + "/" +"trail" + ".mp3";
File f = new File(path);
if (f.exists()) {
f.delete();
}
InputStream stream = null;
FileOutputStream fos = null;
try {
URL url = new URL(urlPath);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
//URL url = new URL(urlPath);
InputStream input = new BufferedInputStream(url.openStream());
stream = url.openConnection().getInputStream();
InputStreamReader reader = new InputStreamReader(stream);
fos = new FileOutputStream(f.getPath());
byte data[] = new byte[lenghtOfFile];
long total = 0;
int times = -1;
while ((times = reader.read()) != -1) {
fos.write(times);
}
// Successful finished
result = Activity.RESULT_OK;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
publishResults(output.getAbsolutePath(), result);
}

1.Check if urlPath is correct.You can open it by explorer and check if a .mp3 begins to be downloaded.
2.Compare size of the file that you get by explorer to the one that downloaded through your code.
3.If the sizes differ,that means download failure.Try to modify your code like this:
String urlPath = intent.getStringExtra(URL);
String fileName = intent.getStringExtra(FILENAME);
File output = new File(Environment.getExternalStorageDirectory(),
fileName);
File dir = new File(output.getAbsolutePath()
+ "/TRIALS/");
dir.mkdirs();
String path = dir + "/" +"trail" + ".mp3";
File f = new File(path);
if (f.exists()) {
f.delete();
}
InputStream stream = null;
FileOutputStream fos = null;
try {
URL url = new URL(urlPath);
URLConnection urlcon = url.openConnection();
stream = urlcon.getInputStream();
InputStreamReader reader = new InputStreamReader(stream);
fos = new FileOutputStream(f.getPath());
int times = -1;
while ((times = reader.read()) != -1) {
fos.write(times);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
I remove some useless code and add fos.flush() before fos.close().

Download PDF file android

i have An Error while download PDF file From Server and save it on SD
i have permission To Access internet and external storage ..
It`s working fine on android 2.3.6
But on Tab 4.1.1 its create the file with 0 byte
URL url = new URL("https://docs.google.com/"+direct);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setRequestProperty("Connection", "Keep-Alive");
urlConnection.setRequestProperty("Content-Type", "application/xml");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
//set the path where we want to save the file
//in this case, going to save it on the root directory of the
//sd card.
File SDCardRoot = new File(Environment.getExternalStorageDirectory().getAbsoluteFile()+"/folder/");
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(SDCardRoot,book.getBook_name()+".pdf");
//this will be used to write the downloaded data into the file we created
FileOutputStream fileOutput = new FileOutputStream(file);
//this will be used in reading the data from the internet
InputStream inputStream = urlConnection.getInputStream();
//this is the total size of the file
totalSize = urlConnection.getContentLength();
//variable to store total downloaded bytes
//create a buffer...
byte[] buffer = new byte[1024];
int bufferLength = 0; //used to store a temporary size of the buffer
//now, read through the input buffer and write the contents to the file
while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
//add the data in the buffer to the file in the file output stream (the file on the sd card
fileOutput.write(buffer, 0, bufferLength);
//add up the size so we know how much is downloaded
downloadedSize += bufferLength;
//this is where you would do something to report the prgress, like this maybe
publishProgress((downloadedSize*100)/totalSize);
}
//close the output stream when done
fileOutput.close();
//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

Try this:
private String getExternalSDPath() {
File file = new File("/system/etc/vold.fstab");
FileReader fr = null;
BufferedReader br = null;
try {
fr = new FileReader(file);
} catch (FileNotFoundException e) {
// handle
}
String path = null;
try {
if (fr != null) {
br = new BufferedReader(fr);
String s = br.readLine();
while (s != null) {
if (s.startsWith("dev_mount")) {
String[] tokens = s.split("\\s");
path = tokens[2]; // mount_point
if (Environment.getExternalStorageDirectory()
.getAbsolutePath().equals(path)) {
break;
}
}
s = br.readLine();
}
}
} catch (IOException e) {
// handle
} finally {
try {
if (fr != null) {
fr.close();
}
if (br != null) {
br.close();
}
} catch (IOException e) {
// handle
}
}
return path;
}
The code is made specifically for Samsung Devices with both internal, an internal that acts as external, and SD.
I needed to access the SD and came up with the above code, so you can try it and possibly modify it to work on all devices.
Edit: My download AsyncTask
private class DownloadFile extends AsyncTask<Void, Void, String> {
#Override
protected String doInBackground(Void... params) {
String filename = "somefile.pdf";
HttpURLConnection c;
try {
URL url = new URL("http://someurl.com/" + filename);
c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
} catch (IOException e1) {
return e1.getMessage();
}
File myFilesDir = new File(Environment
.getExternalStorageDirectory().getAbsolutePath()
+ "/Download");
File file= new File(myFilesDir, filename);
if (file.exists()) {
file.delete();
}
if ((myFilesDir.mkdirs() || myFilesDir.isDirectory())) {
try {
InputStream is = c.getInputStream();
FileOutputStream fos = new FileOutputStream(myFilesDir
+ "/" + filename);
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
} catch (Exception e) {
return e.getMessage();
}
} else {
return "Unable to create folder";
}
}
#Override
protected void onPostExecute(String result) {
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG)
.show();
super.onPostExecute(result);
}
}

Save image from url to sdcard

I am saving image from url to sdcard. But image size is 0 in sdcard. Image is created in sdcard but now retrieve data from url and save. so it is giving me 0 size.
try
{
URL url = new URL("http://api.androidhive.info/images/sample.jpg");
InputStream input = url.openStream();
try {
//The sdcard directory e.g. '/sdcard' can be used directly, or
//more safely abstracted with getExternalStorageDirectory()
File storagePath = Environment.getExternalStorageDirectory();
OutputStream output = new FileOutputStream (new File(storagePath,username+".png"));
try {
byte[] buffer = new byte[2048];
int bytesRead = 0;
while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
output.write(buffer, 0, bytesRead);
}
} finally {
output.close();
}
} finally {
input.close();
}
} catch(Exception e)
{
System.out.println("error in sd card "+e.toString());
}

Try this code.It works...
You should have permission of internet and write external storage.
try
{
URL url = new URL("Enter the URL to be downloaded");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
File SDCardRoot = Environment.getExternalStorageDirectory().getAbsoluteFile();
String filename="downloadedFile.png";
Log.i("Local filename:",""+filename);
File file = new File(SDCardRoot,filename);
if(file.createNewFile())
{
file.createNewFile();
}
FileOutputStream fileOutput = new FileOutputStream(file);
InputStream inputStream = urlConnection.getInputStream();
int totalSize = urlConnection.getContentLength();
int downloadedSize = 0;
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ( (bufferLength = inputStream.read(buffer)) > 0 )
{
fileOutput.write(buffer, 0, bufferLength);
downloadedSize += bufferLength;
Log.i("Progress:","downloadedSize:"+downloadedSize+"totalSize:"+ totalSize) ;
}
fileOutput.close();
if(downloadedSize==totalSize) filepath=file.getPath();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
filepath=null;
e.printStackTrace();
}
Log.i("filepath:"," "+filepath) ;
return filepath;

Try this, this may late but it will help someone.
private class ImageDownloadAndSave extends AsyncTask<String, Void, Bitmap>
{
#Override
protected Bitmap doInBackground(String... arg0)
{
downloadImagesToSdCard("","");
return null;
}
private void downloadImagesToSdCard(String downloadUrl,String imageName)
{
try
{
URL url = new URL(img_URL);
/* making a directory in sdcard */
String sdCard=Environment.getExternalStorageDirectory().toString();
File myDir = new File(sdCard,"test.jpg");
/* if specified not exist create new */
if(!myDir.exists())
{
myDir.mkdir();
Log.v("", "inside mkdir");
}
/* checks the file and if it already exist delete */
String fname = imageName;
File file = new File (myDir, fname);
if (file.exists ())
file.delete ();
/* Open a connection */
URLConnection ucon = url.openConnection();
InputStream inputStream = null;
HttpURLConnection httpConn = (HttpURLConnection)ucon;
httpConn.setRequestMethod("GET");
httpConn.connect();
if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK)
{
inputStream = httpConn.getInputStream();
}
FileOutputStream fos = new FileOutputStream(file);
int totalSize = httpConn.getContentLength();
int downloadedSize = 0;
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ( (bufferLength = inputStream.read(buffer)) >0 )
{
fos.write(buffer, 0, bufferLength);
downloadedSize += bufferLength;
Log.i("Progress:","downloadedSize:"+downloadedSize+"totalSize:"+ totalSize) ;
}
fos.close();
Log.d("test", "Image Saved in sdcard..");
}
catch(IOException io)
{
io.printStackTrace();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
Declare your network operations in AsyncTask as it will load it as a background task. Don't load network operation on main thread. After this either in button click or in content view call this class like
new ImageDownloadAndSave().execute("");
And don't forget to add the nework permission as:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
Hope this will help :-)

Download image and strore in sdcard folder

I want to download image from url and store in sdcard's folder.If folder is not exist make folder and save it.But its giving following exception:
java.io.FileNotFoundException: /mnt/sdcard (Is a directory)

The message is clear. /mnt/sdcard is a directory not a file. You need to create FileOutputStream that writes to a non-directory path.
For example:
//Setting up cache directory to store the image
File cacheDir=new File(context.getCacheDir(),"cache_folder");
// Check if cache folder exists, otherwise create folder.
if(!cacheDir.exists())cacheDir.mkdirs();
// Setting up file to write the image to.
File f=new File(cacheDir, "img.png");
// Open InputStream to download the image.
InputStream is=new URL(url).openStream();
// Set up OutputStream to write data into image file.
OutputStream os = new FileOutputStream(f);
HelperUtil.CopyStream(is, os);
...
/**
* Copy all data from InputStream and write using OutputStream
* #param is InputStream
* #param os OutputStream
*/
public static void CopyStream(InputStream is, OutputStream os)
{
final int buffer_size=1024;
try
{
byte[] bytes=new byte[buffer_size];
for(;;)
{
int count=is.read(bytes, 0, buffer_size);
if(count==-1)
break;
os.write(bytes, 0, count);
}
}
catch(Exception ex){}
}

try something like this
String image_URL="http://chart.apis.google.com/chart?chs=200x200&cht=qr&chl=http%3A%2F%2Fandroid-er.blogspot.com%2F";
String extStorageDirectory;
File file;
Bitmap bm;
if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)){
file=new File(android.os.Environment.getExternalStorageDirectory(),"Your FolderName");
extStorageDirectory = Environment.getExternalStorageDirectory().toString();
}else{
file=YourActivity.this.getCacheDir();
}
if(!file.exists())
file.mkdirs();
extStorageDirectory+="Your FolderName/yourimagename.PNG";
File imageFile = new File(extStorageDirectory);
Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
if(bitmap!=null){
imageview.setImageBitmap(bitmap);
}else{
extStorageDirectory = Environment.getExternalStorageDirectory().toString();
BitmapFactory.Options bmOptions;
bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
bm = LoadImage(image_URL, bmOptions);
imageview.setImageBitmap(bm);
OutputStream outStream = null;
file=new File(android.os.Environment.getExternalStorageDirectory(),"Your FolderName");
file=new File(extStorageDirectory, "Your FolderName/yourimagename.PNG");
try {
outStream = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
where method are as
private Bitmap LoadImage(String URL, BitmapFactory.Options options)
{
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in, null, options);
in.close();
} catch (IOException e1) {
}
return bitmap;
}
private InputStream OpenHttpConnection(String strURL) throws IOException{
InputStream inputStream = null;
URL url = new URL(strURL);
URLConnection conn = url.openConnection();
try{
HttpURLConnection httpConn = (HttpURLConnection)conn;
httpConn.setRequestMethod("GET");
httpConn.connect();
if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = httpConn.getInputStream();
}
}catch (Exception ex){
Log.e("error",ex.toString());
}
return inputStream;
}

You are giving wrong path when triying to save the picture. IT seems that you use "/mnt/sdcard" whereas it should be something like "/mnt/sdcard/image.jpg"

BitmapFactory.Options bmOptions;
bmOptions = new BitmapFactory.Options();
bmOptions.inSampleSize = 1;
bm = LoadImage(image_url, bmOptions);
extStorageDirectory = Environment.getExternalStorageDirectory()
.toString() + "/image_folder";
OutputStream outStream = null;
File wallpaperDirectory = new File(extStorageDirectory);
wallpaperDirectory.mkdirs();
File outputFile = new File(wallpaperDirectory, "image.PNG");
try {
outStream = new FileOutputStream(outputFile);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
try {
bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
private Bitmap LoadImage(String URL, BitmapFactory.Options options) {
Bitmap bitmap = null;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
bitmap = BitmapFactory.decodeStream(in, null, options);
in.close();
} catch (IOException e1) {
}
return bitmap;
}
private InputStream OpenHttpConnection(String strURL) throws IOException {
InputStream inputStream = null;
URL url = new URL(strURL);
URLConnection conn = url.openConnection();
try {
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setRequestMethod("GET");
httpConn.connect();
if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = httpConn.getInputStream();
}
} catch (Exception ex) {
}
return inputStream;
}

Try this one, that will return the External memory if it is exist, otherwise it will return the phone memory directory. The constructor takes Context and the name of the folder that you want to create as parameters. And also try this link, its quite nice stuff about what you need. Image Loader
public class FileCache {
private File cacheDir;
private String applicationDirectory = Config.applicationMainFolder;
public FileCache(Context context, String folderName){
//Find the dir to save cached images
if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
cacheDir=new File(context.getExternalFilesDir(null), applicationDirectory + folderName);
else
cacheDir = new File(context.getCacheDir(), applicationDirectory + folderName);
if(!cacheDir.exists())
cacheDir.mkdirs();
}
public File getFile(String url){
String filename=String.valueOf(url.hashCode());
File f = new File(cacheDir, filename);
return f;
}
public void clear(){
File[] files=cacheDir.listFiles();
if(files==null)
return;
for(File f:files)
f.delete();
}
}

use this
if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
File file=new File(Environment.getExternalStorageDirectory()+path);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,100, bytes);
byte b[] = bytes.toByteArray();
try
{
FileOutputStream fos = new FileOutputStream(file);
fos.write(b);
fos.flush();
fos.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
path will be your folder in sdcard and bitamp is object of image