Develop Reference

Proper strategy of getting byte content of big images from Gallery when OutOfMemoryError is thrown

First of all I would like to say, that loading big images strategy is described here. I am aware of the obligation to resize the image to omit OutOfMemoryError. I would like to get bytes from the image to be able to send it through Internet.
public byte[] getAttachment(Context context, String fullFilePath) {
byte[] fileBytes = mFileUtil.readFileAsBytes(fullFilePath);
if (fileBytes == null) {
Logger.i("Unable to get bytes, trying through content resolver");
try {
fileBytes = mFileUtil.readFileFromContentResolver(context, fullFilePath);
} catch (OutOfMemoryError e) {
Uri imageUri = Uri.parse(fullFilePath);
if (checkIfFileIsImage(context, imageUri)) {
try {
InputStream stream = context.getContentResolver().openInputStream(imageUri);
if (stream == null) {
return null;
}
BitmapFactory.Options options = getOptions(stream, 2000, 2000);
stream.close();
stream = context.getContentResolver().openInputStream(imageUri);
if (stream == null) {
return null;
}
Bitmap bitmap = BitmapFactory.decodeStream(stream, null, options);
bitmap = rotateBitmap(context, imageUri, bitmap);
stream.close();
fileBytes = convertBitmapToArray(bitmap);
} catch (Exception e1) {
Logger.e("Unable to get bytes using fallback method, attachment " +
"will not be added");
} catch (OutOfMemoryError e2) {
Logger.e("Unable to get bytes using fallback method, because " +
"attachment is too big. Attachment will not be added");
}
}
System.gc();
}
}
return fileBytes;
}
FileUtil.class
public byte[] readFileAsBytes(String fileName) {
File originalFile = new File(fileName);
byte[] bytes = null;
try {
FileInputStream fileInputStreamReader = new FileInputStream(originalFile);
bytes = new byte[(int) originalFile.length()];
fileInputStreamReader.read(bytes);
} catch (IOException e) {
}
return bytes;
}
public byte[] readFileFromContentResolver(Context context, String fileName) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
InputStream is = null;
InputStream inputStream = null;
try {
inputStream = context.getContentResolver().openInputStream(Uri.parse(fileName));
is = new BufferedInputStream(inputStream);
byte[] data = new byte[is.available()];
is.read(data);
bos.write(data);
} catch (Exception e) {
} finally {
try {
if (is != null) {
is.close();
}
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e1) {
}
}
return bos.toByteArray();
}
As you can see the aim of this code is to get byte[] from Bitmap unlike here. It works without problems in almost any case. However it is especially error prone on low-end devices with older Android systems (but also very rarely).
I don't like the idea of setting largeHeap inside AndroidManifest.xml as this is just masking the problem rather than cope with it. I also would not like to send even smaller images.
Could this piece of code be improved in any other way in order to get rid of OutOfMemoryError?

Android Studio - Get tweet image from twitter - Fabric

I'm getting a twitter feed in my Android Studio app, using Fabric
for each tweet that has an image attactched, I wish to display the image
how can I extract either a url to the image or a byte[]?
I have found what looks like an array of bytes, but when I attempt to decode it using bitmaps decodeByteArray, it returns null
String mediaString = t.entities.media.toString();
String[] mediaArray = mediaString.split("(?=#)");
byte[] mediaBytes = mediaArray[1].getBytes();
can anybody help me find a way to retrieve the image so I can display it?

Image url
String mediaImageUrl = tweet.entities.media.get(0).url;
Bitmap mediaImage = getBitmapFromURL(mediaImageUrl);
Bitmap mImage = null;
Decode the image
private Bitmap getBitmapFromURL(final String mediaImageUrl) {
try {
Thread t = new Thread() {
public void run() {
try {
URL url = new URL(mediaImageUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inScaled = false;
mImage = BitmapFactory.decodeStream(input, null, options);
} catch (Exception e) {
e.printStackTrace();
}
}
};
t.start();
} catch (Exception e) {
e.printStackTrace();
}
return mImage;
}

i am getting image only if it is available like:
String mediaImageUrl = null;
if (tweet.entities.media != null) {
String type = tweet.entities.media.get(0).type;
if (type.equals("photo")) {
mediaImageUrl = tweet.entities.media.get(0).mediaUrl;
}
else {
mediaImageUrl = "'";
}
System.out.println("mediaImageUrl" + mediaImageUrl);
}
If u using type attributes u can easily differentiates image/video from userTimeLine

Android : bitmap is null when getting data from caching using Voley

I am using volley library and displaying image successfully. I want to get same downloaded image from cache . This is my code :
private Bitmap getBitmapFromUrl(String url){
String str = "" ;
Bitmap bitmap = null ;
byte[] bytes = null ;
Cache cache = AppController.getInstance().getRequestQueue().getCache();
Entry entry = cache.get(url);
try {
str = new String(entry.data, "UTF-8");
bytes = str.getBytes("UTF_8") ;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
bitmap = BitmapFactory.decodeByteArray( bytes, 0,bytes.length,options);
Log.i(PostItemAdapter.class.getSimpleName(), bitmap+"");
return bitmap ;
}
My issue is that the bitmap object is null .
Can any one tell me why ? thanks in advance .

My problem solved using the aid of this great link where I copied the three files in their images package :
DiskLruImageCache
ImageCacheManager
BitmapLruImageCache
Also I copied RequestManager file. Also there was an issue faced me in the DiskLruImageCache when creating the key from the URL, and I solved this by replacing few lines in this file.
The solution
-old code:
First
#Override
public Bitmap getBitmap( String key ) {
Bitmap bitmap = null;
DiskLruCache.Snapshot snapshot = null;
try {
snapshot = mDiskCache.get( key );
....... etc
Second
#Override
public void putBitmap( String key, Bitmap data ) {
DiskLruCache.Editor editor = null;
try {
editor = mDiskCache.edit( key );
......etc
-new code:
First
#Override
public Bitmap getBitmap( String key ) {
Bitmap bitmap = null;
DiskLruCache.Snapshot snapshot = null;
try {
snapshot = mDiskCache.get( ImageCacheManager.getInstance().createKey(key) );
....etc
Second
#Override
public void putBitmap( String key, Bitmap data ) {
DiskLruCache.Editor editor = null;
try {
editor = mDiskCache.edit( ImageCacheManager.getInstance().createKey(key) );
.....etc
Note : All this modification in DiskLruImageCache , Beside the caching you can save images to SD Card by this function :
private void saveImageToSD(Bitmap bmp) {
bytes = new ByteArrayOutputStream();
bmp.compress(mCompressFormat, 90, bytes);
file = new File(Environment.getExternalStorageDirectory()+File.separator+"myImage"+(++i)+".jpg");
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
/*--- create a new FileOutputStream and write bytes to file ---*/
try {
fos = new FileOutputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
fos.write(bytes.toByteArray());
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
And calling to this function be inside the getBitmap(String URL) function witch inside the DiskLruImageCache file .

Downloaded image can not be displayed

I previously worked on fetching image from sd card displaying it in a list view, that worked using:
imgView.setImageURI(Uri.parse(ImagePath));
Now, I am trying to display image from URL, with the following lines but the image is not displayed in the list view, the following are the lines used:
imgView.setImageBitmap(getBitmapFromURL(ImagePath));
Where, getBitmapFromURL is:
public static Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
}
catch (IOException e) {
e.printStackTrace();
return null;
}
}
There is no exception displayed, the image just not get displayed.
Need of an urgent solution....
Thanks,

This is a synchronous loading.(Personally I would not use this cause if there are so many Image to be loaded, the apps is a bit laggy)..
URL url = new URL(//your URL);
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bmp);//your imageview
If I were you I would study Async or the lazy adapter..
EDIT
I forgot where I got these code (well thank you for a wonderful code author)
Here it is
public Bitmap getBitmap(String bitmapUrl) {
try {
URL url = new URL(bitmapUrl);
return BitmapFactory.decodeStream(url.openConnection().getInputStream());
}
catch(Exception ex) {return null;}
}
public enum BitmapManager {
INSTANCE;
private final Map<String, SoftReference<Bitmap>> cache;
private final ExecutorService pool;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
private Bitmap placeholder;
BitmapManager() {
cache = new HashMap<String, SoftReference<Bitmap>>();
pool = Executors.newFixedThreadPool(5);
}
public void setPlaceholder(Bitmap bmp) {
placeholder = bmp;
}
public Bitmap getBitmapFromCache(String url) {
if (cache.containsKey(url)) {
return cache.get(url).get();
}
return null;
}
public void queueJob(final String url, final ImageView imageView,
final int width, final int height) {
/* Create handler in UI thread. */
final Handler handler = new Handler() {
#Override
public void handleMessage(Message msg) {
String tag = imageViews.get(imageView);
if (tag != null && tag.equals(url)) {
if (msg.obj != null) {
imageView.setImageBitmap((Bitmap) msg.obj);
} else {
imageView.setImageBitmap(placeholder);
Log.d(null, "fail " + url);
}
}
}
};
pool.submit(new Runnable() {
public void run() {
final Bitmap bmp = downloadBitmap(url, width, height);
Message message = Message.obtain();
message.obj = bmp;
Log.d(null, "Item downloaded: " + url);
handler.sendMessage(message);
}
});
}
public void loadBitmap(final String url, final ImageView imageView,
final int width, final int height) {
imageViews.put(imageView, url);
Bitmap bitmap = getBitmapFromCache(url);
// check in UI thread, so no concurrency issues
if (bitmap != null) {
Log.i("inh","Item loaded from cache: " + url);
imageView.setImageBitmap(bitmap);
} else {
imageView.setImageBitmap(placeholder);
queueJob(url, imageView, width, height);
}
}
private Bitmap downloadBitmap(String url, int width, int height) {
try {
Bitmap bitmap = BitmapFactory.decodeStream((InputStream) new URL(
url).getContent());
bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
Log.i("nandi2 ako", ""+bitmap);
cache.put(url, new SoftReference<Bitmap>(bitmap));
return bitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
Now to call it
String fbAvatarUrl = "//Your URL";
BitmapManager.INSTANCE.loadBitmap(fbAvatarUrl, //Your ImageView, 60,60);
//60 60 is my desired height and width

I encountered this kind problem before, you can refer to this thread, if no luck, try my code,
public static Bitmap loadImageFromUrl(String url) {
URL m;
InputStream i = null;
BufferedInputStream bis = null;
ByteArrayOutputStream out =null;
try {
m = new URL(url);
i = (InputStream) m.getContent();
bis = new BufferedInputStream(i,1024 * 8);
out = new ByteArrayOutputStream();
int len=0;
byte[] buffer = new byte[1024];
while((len = bis.read(buffer)) != -1){
out.write(buffer, 0, len);
}
out.close();
bis.close();
} catch (MalformedURLException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
byte[] data = out.toByteArray();
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
return bitmap;
}

How can I fetch a large image from a url?

I used the code below to fetch the image from a url but it doesn't working for large images.
Am I missing something when fetching that type of image?
imgView = (ImageView)findViewById(R.id.ImageView01);
imgView.setImageBitmap(loadBitmap("http://www.360technosoft.com/mx4.jpg"));
//imgView.setImageBitmap(loadBitmap("http://sugardaddydiaries.com/wp-content/uploads/2010/12/how_do_i_get_sugar_daddy.jpg"));
//setImageDrawable("http://sugardaddydiaries.com/wp-content/uploads/2010/12/holding-money-copy.jpg");
//Drawable drawable = LoadImageFromWebOperations("http://www.androidpeople.com/wp-content/uploads/2010/03/android.png");
//imgView.setImageDrawable(drawable);
/* try {
ImageView i = (ImageView)findViewById(R.id.ImageView01);
Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL("http://sugardaddydiaries.com/wp-content/uploads/2010/12/holding-money-copy.jpg").getContent());
i.setImageBitmap(bitmap);
} catch (MalformedURLException e) {
System.out.println("hello");
} catch (IOException e) {
System.out.println("hello");
}*/
}
protected Drawable ImageOperations(Context context, String string,
String string2) {
// TODO Auto-generated method stub
try {
InputStream is = (InputStream) this.fetch(string);
Drawable d = Drawable.createFromStream(is, "src");
return d;
} catch (MalformedURLException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}

You're trying to download the Large Image from within the UI Thread....This will cause an ANR (Application not Responding)
Use AsyncTask to download the images, that way, a seperate thread will be used for the download and your UI Thread wont lock up.

see this good example that loads image from server.
blog.sptechnolab.com/2011/03/04/android/android-load-image-from-url/.

If you want to download the image very quickly then you can use AQuery which is similar to JQuery just download the android-query.0.15.7.jar
Import the jar file and add the following snippet
AQuery aq = new AQuery(this);
aq.id(R.id.image).image("http://4.bp.blogspot.com/_Q95xppgGoeo/TJzGNaeO8zI/AAAAAAAAADE/kez1bBRmQTk/s1600/Sri-Ram.jpg");
// Here R.id.image is id of your ImageView
// This method will not give any exception
// Dont forgot to add Internet Permission

public class MyImageActivity extends Activity
{
private String image_URL= "http://home.austarnet.com.au/~caroline/Slideshows/Butterfly_Bitmap_Download/slbutfly.bmp";
private ProgressDialog pd;
private Bitmap bitmap;
private ImageView bmImage;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bmImage = (ImageView)findViewById(R.id.imageview);
pd = ProgressDialog.show(this, "Please Wait", "Downloading Image");
DownloadWebPageTask task = new DownloadWebPageTask();
task.execute(new String[] { image_URL });
// You can also give more images in string array
}
private class DownloadWebPageTask extends AsyncTask<String, Void, Bitmap>
{
// String --> parameter in execute
// Bitmap --> return type of doInBackground and parameter of onPostExecute
#Override
protected Bitmap doInBackground(String...urls) {
String response = "";
for (String url : urls)
{
InputStream i = null;
BufferedInputStream bis = null;
ByteArrayOutputStream out =null;
// Only for Drawable Image
// try
// {
// URL url = new URL(image_URL);
// InputStream is = url.openStream();
// Drawable d = Drawable.createFromStream(is, "kk.jpg");
// bmImage.setImageDrawable(d);
// }
// catch (Exception e) {
// // TODO: handle exception
// }
// THE ABOVE CODE IN COMMENTS WILL NOT WORK FOR BITMAP IMAGE
try
{
URL m = new URL(image_URL);
i = (InputStream) m.getContent();
bis = new BufferedInputStream(i, 1024*8);
out = new ByteArrayOutputStream();
int len=0;
byte[] buffer = new byte[4096];
while((len = bis.read(buffer)) != -1)
{
out.write(buffer, 0, len);
}
out.close();
bis.close();
byte[] data = out.toByteArray();
bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
}
catch (Exception e)
{
e.printStackTrace();
}
}
return bitmap;
}
#Override
protected void onPostExecute(Bitmap result)
{
if(result!=null)
bmImage.setImageBitmap(result);
pd.dismiss();
}
}
}