I have downloaded image from url to sd card. It is shown as normal thumbnail image in sd card but when i click it to view it a message is shown Could not load image also the image is not displayable in imageview. The image was downloaded with the help of Async Task. Now i want to check first if image is displayable or not. If not delete it and redownload it.
Code for downloading the images:
protected Void doInBackground(String... params) {
try{
String fileName = params[0].substring(params[0].lastIndexOf('/') + 1);
URL url = new URL(params[0]);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
File file = new File(SwipeActivity.filename,fileName);
FileOutputStream fileOutput = new FileOutputStream(file);
InputStream inputStream = urlConnection.getInputStream();
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ( (bufferLength = inputStream.read(buffer)) > 0 )
{
fileOutput.write(buffer, 0, bufferLength);
}
fileOutput.close();
}
catch (Exception e) {
// TODO: handle exception
}
return null;
}
Any help is appreciated in advance.
You could try checking whether the image is displayable in build in Gallery app. Ive had this issue with, as it seemed, usual PNG image, the trick was it wasnt an RGB pic, but the CMYK color format. The output was similar to yours, android doesnt display CMYK images in a straight way
Related
i m making an android app to download pdf files from android and then saving them in a folder in internal or external memory.but sometime due to bad internet connection download stops without finshing .like file size is 1.1mb and its only downloaded upto 750kb. now the problem is whether file fully download or not my app showing it as download but in real it is not.so i want to know the exact size of file befor and after download so that i can found whether file is completely download or not.and want to restart the download.
can anybody help me........
my code
String DownloadUrl = "http://www.example.com/books/"+book_name;
String fileName = book_name;
URL url = new URL(DownloadUrl);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
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("/storage/emulated/0/documents/docx/stuff/");
File SDCardRoot = new File(Environment.getExternalStorageDirectory()+File.separator+"MybookStore/paper/paperStuff/documents/docx/other/stuff/");
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(SDCardRoot,fileName);
String file_size = Long.toString(file.length()/1024);
int size_file=Integer.parseInt(file_size);
//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
int totalSize = urlConnection.getContentLength();
//variable to store total downloaded bytes
int downloadedSize = 0;
//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;
int progress=(int)(downloadedSize*100/totalSize);
//this is where you would do something to report the prgress, like this maybe
//updateProgress(downloadedSize, totalSize);
}
my code
Any reasonable server response header will include a Content-Length key, which will hopefully denote the full length of the resource you’re trying to download.
With that in mind, here's a quick example:
HttpURLConnection connection = null;
InputStream input = null;
OutputStream output = null;
try {
final URL url = new URL(resourceUrl);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
final int length = connection.getContentLength();
int downloaded = 0;
input = url.openStream();
output = new FileOutputStream(targetFile);
final byte[] buffer = new byte[BUFFER_SIZE];
int read;
while ((read = input.read(buffer)) != -1) {
output.write(buffer, 0, read);
downloaded += read;
}
if (downloaded == length) {
// The file was successfully downloaded.
} else {
// The file was not fully downloaded.
}
} catch (IOException e) {
// Handle exception.
} finally {
// Close resources.
}
I want to download all the images I have on server in the array string of Url one by one so that I may do not have to download a zip file of images from the server and to unzip after downloading it.
So I thought to download the images one by one and to show the download status in the progress bar. But I am extremely failed in it. An Idea came into my mind to make the string array of the Url and to use the For loop to download but it is downloading the last image of the String array and decline or pass all other images in the array . I think I have got the idea that what is going on but I have know Idea what would be the solution then.
What I have done So far
protected Void doInBackground(Void... arg0) {
try {
//set the download URL, a url that points to a file on the internet
//this is the file to be downloaded
String [] imageUrl = {"http://www.androidbegin.com/tutorial/flag/india.png","http://www.androidbegin.com/tutorial/flag/pakistan.png"
,"http://www.androidbegin.com/tutorial/flag/china.png","http://www.androidbegin.com/tutorial/flag/unitedstates.png"};
URL url;
HttpURLConnection urlConnection = null;
for(int i=0;i<imageUrl.length;i++){
url = new URL(imageUrl[i]);
//create the new connection
urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
}
File storagePath = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "Test");
storagePath.mkdirs();
String finalName = Long.toString(System.currentTimeMillis());
File myImage = new File(storagePath, finalName + ".png");
//this will be used to write the downloaded data into the file we created
FileOutputStream fileOutput = new FileOutputStream(myImage);
//this will be used in reading the data from the internet
InputStream inputStream = urlConnection.getInputStream();
//this is the total size of the file
int totalSize = urlConnection.getContentLength();
//variable to store total downloaded bytes
int downloadedSize = 0;
//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
// updateProgress(downloadedSize, totalSize);
}
//close the output stream when done
fileOutput.close();
//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// see http://androidsnippets.com/download-an-http-file-to-sdcard-with-progress-notification
return null;
}
** What I want :**
Download all the images one by one.
After downloading one Image it should get save in the device and update the progress status.
Please show me some source code rather then giving me just Idea how to do it. And little source code and complete work around on this would be appreciated.
the saving image code should be taken inside for loop. as this code is outside of for loop only your last image is getting saved as at the end of for loop last url is used.
In My android Application i have a list of song.User can download any of song from it.
But my problem is when i download a file using http request it return content length = 0 or -1 so i can not download file.
When i use same url in browser then song downloaded completely.
My code to download a song file is -
URL url = new URL(mUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setDoOutput(true);
connection.setConnectTimeout(TimeOut);
connection.setReadTimeout(TimeOut);
connection.connect();
int lenghtOfFile = connection.getContentLength();
and file length is either 0 or -1.
What the problem in my code.
Thanks in advance.
The best way to run an Http Request wheter download or upload is to use AsycTask in order to split the download task from your UI,
try to download your file by putting this code in a method and call it, if your using an AsyncTask you can add a progressBar and update it's progression from the below given code
to update progress uncomment
updateProgress(downloadedSize,totalSize);
try {
//set the download URL, a url that points to a file on the internet
//this is the file to be downloaded
URL url = new URL("File Url");
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//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 = Environment.getExternalStorageDirectory();
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(SDCardRoot,"song.extension");
//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
int totalSize = urlConnection.getContentLength();
//variable to store total downloaded bytes
int downloadedSize = 0;
//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
//updateProgress(downloadedSize, totalSize); if your run this code from AsyncTask
}
//close the output stream when done
fileOutput.close();
//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
first, sorry for my bad english and second, I have a "little" problem.
I tested a lot of codes from StackOverFlow but i continue with the same problem.
I'm trying to download some images from URL. I have an ExpandableListView and I use a class named Downloadusers to download all information about users.
In this class I get the user's photo URL and I download the images with the following code:
private void downloadFile(String url) {
String filepath = null;
try
{
URL nurl = new URL(url);
HttpURLConnection urlConnection = (HttpURLConnection) nurl.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
File SDCardRoot = getExternalFilesDir(null);
String filename = url.substring(url.lastIndexOf('/') + 1);
Log.i("Local filename:",""+filename+" SDCardRoot: "+SDCardRoot.toString());
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[PHOTO_FILE_MAX_SIZE];
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);
}
I have also verified that the URLs are correct and I have loaded in the browser.
With Log.i("filepath:"," "+filepath); I can see that filepath is correct, so I think that images are downloaded correctly but no, image files are corrupt files, so when I go to load the images into my ImageView I have a NullPointException because bMap readed is null due to corrupt images.
I have all permissions: Internet, Write and read external storage and phone state.
I tried too download images with AsyncTask, but I have the same problem.
Someone know what can be my problem?
Thanks.
Here it is my download method. You will download image into SDCARD. You can check whether image is downloaded or not by going DDMS Perspective.
public void download(String Url) throws IOException {
URL url = new URL (Url);
InputStream input = url.openStream();
try {
File storagePath = new File(Environment.getExternalStorageDirectory());
OutputStream output = new FileOutputStream (new File(storagePath, 'myImage.jpg'));
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();
}
}
This snippet is for showing downloaded image in ImageView.
ImageView image = (ImageView) findViewById(R.id.image);
Bitmap bitmap = BitmapFactory.decodeFile(Environment
.getExternalStorageDirectory() + "myImage.jpg");
image.setImageBitmap(bitmap);
I solved my problem using library nostra13 "universal-image-loader-1.9.2.jar". My code is now:
// If the user photo exists and is public, download and show it.
if (Utils.connectionAvailable(activity)
&& (photoFileName != null) && !photoFileName.equals("")
&& !photoFileName.equals(Constants.NULL_VALUE)) {
// Create options. Setting caché = true (default = false)
DisplayImageOptions options = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.build();
// Create global configuration and initialize ImageLoader
// with this configuration
ImageLoaderConfiguration config = new ImageLoaderConfiguration
.Builder(activity.getApplicationContext())
.defaultDisplayImageOptions(options)
.build();
ImageLoader.getInstance().init(config);
// Load image, decode it to Bitmap and display Bitmap in ImageView
// (or any other view
// which implements ImageAware interface)
ImageLoader.getInstance().displayImage(photoFileName, image);
}
With that code I can load the image on caché and show in my imageview without problems.
Thanks to all.
I had the same problem, but I was able to solve it by setting
urlConnection.setDoOutput(false);
and it worked, but I don't know why.
hi developers i am developing a web based application in android. i want to download a webpage to sdcard to make loading of the webpage make faster. so i download the html file using the below code
try {
//set the download URL, a url that points to a file on the internet
//this is the file to be downloaded
URL url = new URL("http://venusdigitalarcade.com/index.html");
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
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 = Environment.getExternalStorageDirectory();
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(SDCardRoot,"venus.html");
//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
int totalSize = urlConnection.getContentLength();
//variable to store total downloaded bytes
int downloadedSize = 0;
//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
// updateProgress(downloadedSize, totalSize);
}
//close the output stream when done
fileOutput.close();
//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
this code only saves the html writings there is no designing part and css file and contents like images and videos
how can i download the full webpages with design and javascrpts and css?
You can create a file list for every resource you need or use a web crawler like http://code.google.com/p/crawler4j/