I am new in Android.
I am downloading images from the internet in the ListView .I getting the url in the file object but when I send it into the Bitmap object the bitmap object is return null means image is not loaded into the bitmap object.please reply me. the code is here:
private Bitmap getBitmap(String url) {
String filename = String.valueOf(url.hashCode());
File f = new File(cacheDir, filename);
// here in f i getting image url
// here in bitmap the url is not loaded & get null
Bitmap bitmap = BitmapFactory.decodeFile(f.getPath());
if(bitmap != null) return bitmap;
// Nope, have to download it
try {
bitmap =
BitmapFactory.decodeStream(new URL(url).openConnection().getInputStream());
// save bitmap to cache for later
writeFile(bitmap, f);
return bitmap;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
private void writeFile(Bitmap bmp, File f) {
FileOutputStream out = null;
try {
out = new FileOutputStream(f);
bmp.compress(Bitmap.CompressFormat.PNG, 80, out);
} catch (Exception e) {
e.printStackTrace();
}
finally {
try { if (out != null ) out.close(); }
catch(Exception ex) {}
}
}
I do not think you are downloading properly the bitmap.
CODE
This is a function I created that will take a url from you and it will return a drawable!
It will save it to a file and get it if it exists
If not, it will download it and return the drawable.
You can easily edit it to save file to your folder instead.
/**
* Pass in an image url to get a drawable object
*
* #return a drawable object
*/
private static Drawable getDrawableFromUrl(final String url) {
String filename = url;
filename = filename.replace("/", "+");
filename = filename.replace(":", "+");
filename = filename.replace("~", "s");
final File file = new File(Environment.getExternalStorageDirectory()
+ File.separator + filename);
boolean exists = file.exists();
if (!exists) {
try {
URL myFileUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
final Bitmap result = BitmapFactory.decodeStream(is);
is.close();
new Thread() {
public void run() {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
result.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
try {
if (file.createNewFile()){
//
}
else{
//
}
FileOutputStream fo;
fo = new FileOutputStream(file);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
BitmapDrawable returnResult = new BitmapDrawable(result);
return returnResult;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
else {
return new BitmapDrawable(BitmapFactory.decodeFile(file.toString()));
}
}
Only thing I can think of here is that you're missing INTERNET permission in your manifest.
Try adding <uses-permission android:name="android.permission.INTERNET" /> in your AndroidManifest.xml if it's not there yet
Related
How to load image from URL and save that on memory of device in android? Dont say me use Picasso or oser laibrary.
I need to:
If device get internet conection I load image to ImageView from url and save it on memory of device, else I need to load one of save image to imageView. Thank`s for helps
P.S. Sorry me, I can make some mistakes in question because I don`t very good know English.
This my class:
public class ImageManager {
String file_path;
Bitmap bitmap = null;
public Bitmap donwoaledImageFromSD() {
File image = new File(Environment.getExternalStorageDirectory().getPath(),file_path);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
return bitmap;
}
private void savebitmap() {
File file = new File("first");
file_path = file.getAbsolutePath();
try {
FileOutputStream fileOutputStream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90,fileOutputStream);
} catch (Exception e) {
e.printStackTrace();
}
}
public void fetchImage(final String url, final ImageView iView) {
new AsyncTask<String, Void, Bitmap>() {
protected Bitmap doInBackground(String... iUrl) {
try {
InputStream in = new URL(url).openStream();
bitmap = BitmapFactory.decodeStream(in);
savebitmap();
} catch (Exception e) {
donwoaledImageFromSD();
}
return bitmap;
}
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (iView != null) {
iView.setImageBitmap(result);
}
}
}.execute(url);
}
}
Try to use this code:
Method for loading image from imageUrl
public Bitmap getBitmapFromURL(String imageUrl) {
try {
URL url = new URL(imageUrl);
HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream inputStream = connection.getInputStream();
Bitmap imageBitmap = BitmapFactory.decodeStream(inputStream);
return imageBitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
And You should use it in a separate thread, like that:
new Thread(new Runnable() {
#Override
public void run() {
try {
Bitmap bitmap = getBitmapFromURL(<URL of your image>);
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
e.getMessage();
}
}
}).start();
But using Picasso - indeed a better way.
Update:
For saving Bitmap to file on external storage (SD card) You can use method like this:
public static void writeBitmapToSD(String aFileName, Bitmap aBitmap) {
if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return;
}
File sdPath = Environment.getExternalStorageDirectory();
File sdFile = new File(sdPath, aFileName);
if (sdFile.exists()) {
sdFile.delete ();
}
try {
FileOutputStream out = new FileOutputStream(sdFile);
aBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
} catch (Exception e) {
}
}
Remember that You need
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
for it.
And for loading `Bitmap` from file on external storage You can use method like that:
public static Bitmap loadImageFromSD(String aFileName) {
Bitmap result = null;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
try {
FileInputStream fis = new FileInputStream(new File(Environment.getExternalStorageDirectory(), aFileName));
result = BitmapFactory.decodeStream(fis);
fis.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "loadImageFromSD: " + e.getMessage());
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}
You need
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
to do this.
Update 2
Method getBitmapFromURL(), but ImageView should be updated from UI thread, so You should call getBitmapFromURL(), for example, this way:
new Thread(new Runnable() {
#Override
public void run() {
try {
final Bitmap bitmap = getBitmapFromURL("<your_image_URL>");
runOnUiThread(new Runnable() {
#Override
public void run() {
imageView.setImageBitmap(bitmap);
}
});
} catch (Exception e) {
e.printStackTrace();
e.getMessage();
}
}
}).start();
I had this same issue and I hope this helps. First, To download Image from URL into your app, use the code below:
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
In order for the image to be displayed inside the app, use the method below in your onCreate method:
new DownloadImageTask((ImageView) -your imageview id-)
.execute(-your URL-);
In order for the image to be saved INTERNALLY inside the app/phone, use the code below:
#SuppressLint("WrongThread")
protected void onPostExecute(Bitmap result) {
if (result != null) {
File dir = new File(peekAvailableContext().getFilesDir(), "MyImages");
if(!dir.exists()){
dir.mkdir();
}
File destination = new File(dir, "image.jpg");
try {
destination.createNewFile();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
result.compress(Bitmap.CompressFormat.PNG, 0, bos);
byte[] bitmapdata = bos.toByteArray();
FileOutputStream fos = new FileOutputStream(destination);
fos.write(bitmapdata);
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
bmImage.setImageBitmap(result);
}
}
To load the image from the internal storage, use the code below:
private void loadImageFromStorage(String path)
{
try {
File f=new File(path, "image.jpg");
Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
ImageView img=(ImageView)findViewById(R.id.businessCard_iv);
img.setImageBitmap(b);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
}
Things to note: 1. path is the a string containing the path of the file. 2. "image.jpg" is the file name so ensure that matches with yours. 3. "MyImages" is a folder in your path which contains the actual saved image.
i am using this method to get images from url and i am downloading more than one image the varable below called "name" is an array of names of the images .i want to be able to store all images whos name is in the array thats why i kept the url like that.it seems to work well but i have having problem selecting only one picture out or them.
this is the code to save images
String fileName="code";
try {
URL url = new URL("http://10.0.2.2/picure/"+name+".jpg");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
Bitmap bm = BitmapFactory.decodeStream(is);
FileOutputStream fos = getActivity().openFileOutput(fileName, Context.MODE_PRIVATE);
ByteArrayOutputStream outstream = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, outstream);
byte[] byteArray = outstream.toByteArray();
fos.write(byteArray);
fos.close();
Toast.makeText(getActivity()," connected", Toast.LENGTH_LONG).show();
} catch(Exception e) {
}
this is the code to collect images
String path = mContext.getFilesDir().toString();
String fileName = "code";
if (fileName != null && !fileName.equals("")) {
Bitmap bMap = BitmapFactory.decodeFile(path + "/" + fileName);
if (bMap != null) {
category_logo.setImageBitmap(bMap);
}
}
i know the names of the images i saved so how do i select that one specifically
For get all images use a Asynctask, this code can download images in cache directory of the app:
class ImageDownloader extends AsyncTask<String, Void, File> {
String imageurl;
String name;
Context ctx;
public ImageDownloader(Context context, String url, String fileName) {
this.imageurl = url;
this.name = fileName;
this.ctx = context;
}
#Override
protected File doInBackground(String... urls) {
Bitmap mIcon;
File cacheDir = ctx.getCacheDir();
File f = new File(cacheDir, name);
try {
InputStream in = new java.net.URL(imageurl).openStream();
mIcon = BitmapFactory.decodeStream(in);
try {
FileOutputStream out = new FileOutputStream(
f);
mIcon.compress(
Bitmap.CompressFormat.JPEG,
100, out);
out.flush();
out.close();
return f;
} catch (FileNotFoundException e) {
return null;
} catch (IOException e) {
return null;
}
} catch (Exception e) {
return null;
}
}
#Override
protected void onPostExecute(File result) {
super.onPostExecute(result);
Toast.makeText(ctx," connected " + name, Toast.LENGTH_LONG).show();
}
}
}
For call the asynctask, you need use a FOR for get all names and url of the image:
new ImageDownloader(getBaseContext(),url[i],name[i]).execute();
You can edit the doInBackground with your code, but the HTTPConnection that you use is deprecated in API 22, please use the example above, you can change the directory.
And sorry for the code, you can reformat later.
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CODE_MULTIPLE_IMG_GALLERY && resultCode==RESULT_OK){
ClipData clipData = data.getClipData();
if (clipData!=null){
File folderPath = new File(getIntent().getStringExtra("folderpath"));
for (int i = 0;i< clipData.getItemCount();i++){
ClipData.Item item = clipData.getItemAt(i);
Uri uri = item.getUri();
Bitmap selectedImage = loadFromUri(uri);
File imagePath = new File(folderPath,System.currentTimeMillis()+".jpg");
try {
outputStream = new FileOutputStream(imagePath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
selectedImage.compress(Bitmap.CompressFormat.JPEG,100,outputStream);
Log.d("uri",uri.toString());
imageModelList.add(new ImageModel(uri.toString()));
}
imagesAdapter.notifyDataSetChanged();
Toast.makeText(ImageDetailActivity.this, "Added Successfully!", Toast.LENGTH_SHORT).show();
}
}
}
public Bitmap loadFromUri(Uri photoUri) {
Bitmap image = null;
try {
// check version of Android on device
if(Build.VERSION.SDK_INT > 27){
// on newer versions of Android, use the new decodeBitmap method
ImageDecoder.Source source = ImageDecoder.createSource(this.getContentResolver(), photoUri);
image = ImageDecoder.decodeBitmap(source);
} else {
// support older versions of Android by using getBitmap
image = MediaStore.Images.Media.getBitmap(this.getContentResolver(), photoUri);
}
} catch (IOException e) {
e.printStackTrace();
}
return image;
}
I try to use FlushedInputStream : Android decoder->decode returned false for Bitmap download
but nothing change, because i use: BitmapFactory.decodeFile(path_of_my_downloaded_file), not use BitmapFactory.decodeStream
This is my code of download file:
public static boolean downloadFile(String url, String dir, String name){
Log.i("Start Downloading ", "=");
// Create download folder:
File f = new File(dir);
if(!f.exists()){
f.mkdirs();
}
try {
File fTo = new File(dir, name);
URL downloadUrl = new URL(url);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) downloadUrl.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
FlushedInputStream in = new FlushedInputStream(downloadUrl.openStream());
// in = new FlushedInputStream(in);
byte[] buffer= new byte[4096];
// Write file to toFolder
FileOutputStream os = new FileOutputStream(fTo);
try {
do{
int numread = in.read(buffer);
if (numread <= 0) {
break;
}
os.write(buffer, 0, numread);
}while(true);
} catch (ConnectTimeoutException e) {
e.printStackTrace();
return false;
}
if (os != null) {
os.close();
}
if (in != null) {
in.close();
}
} catch (IOException e) {
Log.e("Error reading file", e.toString());
return false;
}
return true;
}
And this is my code to set Bitmap to ImageView:
Bitmap bitmap = BitmapFactory.decodeFile(my_file);
mImageView.setImageBitmap(bitmap);
I always have "decoder->decode returned false"
Note: I have to download this image first.
This is the problems of image.
In my application i am downloading images from the web and these images will be stored in the sdcard. Here i am using the url as file name. For this first i am checking the file name is exits in the sdcard. if it exists then get the image from the sdcard. otherwise i am getting from web.But i am geting the following exception how to handle it.
Exception
09-09 15:24:58.873: WARN/System.err(1117): java.io.IOException: Parent directory of file is not writable: /sdcard/http+++ecx.images-amazon.com+images+I+41KdssHpg1L._SL160_.jpg
09-09 15:24:58.904: WARN/System.err(1117): at java.io.File.createNewFile(File.java:1263)
09-09 15:24:58.924: WARN/System.err(1117): at com.ibkr.elgifto.GiftCategories$itemlistadapter$4$1.run(GiftCategories.java:947)
Code
private Drawable getDrawableFromUrl(String imageUrl) {
String filename = imageUrl;
filename = filename.replace("/", "+");
filename = filename.replace(":", "+");
filename = filename.replace("~", "s");
final File file = new File(Environment.getExternalStorageDirectory() + File.separator + filename);
boolean exists = file.exists();
if (!exists) {
try {
URL myFileUrl = new URL(imageUrl);
HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
final Bitmap result = BitmapFactory.decodeStream(is);
is.close();
new Thread() {
public void run() {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
if (result != null) {
result.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
}
try {
if (file.createNewFile()) {
//
} else {
//
}
FileOutputStream fo;
fo = new FileOutputStream(file);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
// result.recycle();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
BitmapDrawable returnResult = new BitmapDrawable(result);
return returnResult;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
} else {
return new BitmapDrawable(BitmapFactory.decodeFile(file.toString()));
}
}
just add permission to AndroidManifest.xml file and check, it may work.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
You should always check whether SD storage is available before accessing it. If it's not, you can inform the user about failure instead of crashing application. Here's the function I'm using:
public static boolean storageAvailable()
{
String state = Environment.getExternalStorageState();
if (!Environment.MEDIA_MOUNTED.equals(state)) return false;
return true;
}
There's also possibility you forgot to add required permission into AndroidManifest.xml:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
In my activity, I am downloading images from url. I want these images to be downloaded only for the first time. Later on when I visit this page, it should take the image from the sdcard. How can I do that? Can anyone help?
In manifest I have set permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
The method which I use for downloading is:
public static Bitmap downloadFileFromUrl(String fileUrl){
URL myFileUrl =null;
Bitmap imageBitmap = null;
try {
myFileUrl= new URL(fileUrl);
}
catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection connection= (HttpURLConnection)myFileUrl.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream is = connection.getInputStream();
imageBitmap = BitmapFactory.decodeStream(is);
//Below two lines I just tried out for saving to sd card.
FileOutputStream out = new FileOutputStream(fileUrl);
imageBitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
}
catch (IOException e) {
e.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
return imageBitmap;
}
Try this method
public void DownloadImage(String imageUrl)
{
InputStream is = null;
if((imageUrl == null) || (imageUrl.length() == 0) || (imageUrl == " "))
{
System.out.println("No need to download images now");
}
else
{
System.gc();
String[] items;
String ImageName = null;
URL myFileUrl =null;
Bitmap bmImg = null;
String path = IMAGE_DOWNLOAD_PATH;
FileOutputStream outStream = null;
File file = new File(path);
if(!file.exists())
{
file.mkdirs();
}
File outputFile;
BufferedOutputStream bos;
try {
myFileUrl= new URL(imageUrl.trim());
HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.setConnectTimeout(20000);
conn.connect();
is = conn.getInputStream();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ImageName = getImageName(imageUrl);
try {
outputFile = new File(file, ImageName);
if(outputFile.exists())
{
System.out.println("No need to download image it already exist");
outputFile.delete();
}
outputFile.createNewFile();
outStream = new FileOutputStream(outputFile);
//bos = new BufferedOutputStream(outStream);
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayBuffer baf = new ByteArrayBuffer(50);
int current = 0;
while ((current = bis.read()) != -1)
{
baf.append((byte) current);
}
outStream.write(baf.toByteArray());
outStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
and then to retrieve image from sdcard,
File extStore = Environment.getExternalStorageDirectory();
String file_path = "/(folder name)/"+"(image name)".trim()+".extension".trim();
String mypath = extStore + file_path;
Bitmap bmp=BitmapFactory.decodeFile(mypath);
ImageView image = (ImageView) v.findViewById(R.id.image);
image.setImageBitmap(bmp);
You should store somewhere what you've got in cache.
Or if your filename are unique you've to check than the file exist or not.
You have to write the data got from InputStream to specified SD card location ..