Develop Reference

how to change image file name in android studio?

I am downloading an image from URL and displaying on an imageview but the problem is if image name starts with a digit it can't be displayed.
private class DownloadFilesTask extends AsyncTask<String, Void, Bitmap> {
protected Bitmap doInBackground(String... urls) {
try {
URL url = new URL(urls[0]);
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;
}
}
protected void onProgressUpdate(Integer... progress) {
}
protected void onPostExecute(Bitmap result) {
//loading.dismiss();
String image_name = result.toString();
if( Character.isDigit(image_name.charAt(0))){
}
imageView.setImageBitmap(result);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
}
}

Since code provided is unclear, so this might help you.
Use Picasso or Universal Image Loader to load Image on ImageView
or save bitmap to sdCard and then load it
see https://stackoverflow.com/a/34629526/5057663

Using BitMaps to get images from Instagram API

I have build an app. I use bitmaps to get images from Instagram API and stora them in a GridView.
But I've a problem, when I use bitmaps and memory cache.
My code is:
public void DisplayImage(String urrl, ImageView imageView) {
String url = urrl.replaceAll(" ", "%20");
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
The variable bitmap returns null, from method memoryCache.get(url):
public Bitmap get(String id){
try{
if(!cache.containsKey(id)) {
return null; }else {
return cache.get(id); }
}catch(NullPointerException ex){
ex.printStackTrace();
return null;
}
}
I tried some solutions, but with no success.
I saw other solutions for similar problems, but neither can solve mine.
I'm new to bitmaps, and this kind of stuff.
EDIT
public class MemoryCache {
private static final String TAG = "MemoryCache";
private Map<String, Bitmap> cache= Collections.synchronizedMap(
new LinkedHashMap<String, Bitmap>(10,1.5f,true));//Last argument true for LRU ordering
private long size=0;//current allocated size
private long limit=1000000;//max memory in bytes
public MemoryCache(){
//use 25% of available heap size
setLimit(Runtime.getRuntime().maxMemory()/4);
}
public void setLimit(long new_limit){
limit=new_limit;
Log.i(TAG, "MemoryCache will use up to "+limit/1024./1024.+"MB");
}
public Bitmap get(String id){
try{
if(!cache.containsKey(id)) {
return null; }else {
//NullPointerException sometimes happen here http://code.google.com/p/osmdroid/issues/detail?id=78
return cache.get(id); }
}catch(NullPointerException ex){
ex.printStackTrace();
return null;
}
}
public void put(String id, Bitmap bitmap){
try{
if(cache.containsKey(id))
size-=getSizeInBytes(cache.get(id));
cache.put(id, bitmap);
size+=getSizeInBytes(bitmap);
checkSize();
}catch(Throwable th){
th.printStackTrace();
}
}
private void checkSize() {
Log.i(TAG, "cache size="+size+" length="+cache.size());
if(size>limit){
Iterator<Map.Entry<String, Bitmap>> iter=cache.entrySet().iterator();//least recently accessed item will be the first one iterated
while(iter.hasNext()){
Map.Entry<String, Bitmap> entry=iter.next();
size-=getSizeInBytes(entry.getValue());
iter.remove();
if(size<=limit)
break;
}
Log.i(TAG, "Clean cache. New size "+cache.size());
}
}
public void clear() {
try{
//NullPointerException sometimes happen here http://code.google.com/p/osmdroid/issues/detail?id=78
cache.clear();
size=0;
}catch(NullPointerException ex){
ex.printStackTrace();
}
}
long getSizeInBytes(Bitmap bitmap) {
if(bitmap==null)
return 0;
return bitmap.getRowBytes() * bitmap.getHeight();
}
}
ImageLoader:
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
Handler handler = new Handler();// handler to display images in UI thread
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.crayon;
public void DisplayImage(String urrl, ImageView imageView) {
String url = urrl.replaceAll(" ", "%20");
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView) {
PhotoToLoad p = new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
// from SD cache
Bitmap b = decodeFile(f);
if (b != null)
return b;
// from web
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
// decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i) {
url = u;
imageView = i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
#Override
public void run() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.url))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
SOLUTION
In class MyGridView, i used Glide like Shmuel send on link!
View view = inflater.inflate(R.layout.medialist_inflate, null);
imgView = (ImageView) view.findViewById(R.id.ivImage);
Glide.with(context).load(imageThumbList.get(position)).into(imgView);
return view;

For loading images from a web url the best practice approach is the use the Glide image loading library.
https://github.com/bumptech/glide
It is an open source image loading library that is recommend and supported by Google.
The api looks like this -
Glide
.with(context)
.load(url)
.centerCrop()
.placeholder(R.drawable.loading_spinner)
.crossFade()
.into(myImageView);
See how easy that is :D
It automatically handles caching the images (both in memory and to disk).

Getting bitmap as null

I am trying to download the image from url and save it in a file. But it's not getting saved. So as I debug the code I found that bitmap is always null.
code:
public class ImageUserTask extends AsyncTask<Void, Void,String> {
String strURL, imageprofile;
Bitmap mBitmap = null;
Context mContext;
private File profileFile;
public ImageUserTask(Context context, String url) {
this.strURL = url;
this.imageprofile = imageprofile;
this.mContext = context;
}
#Override
protected String doInBackground(Void... params) {
Bitmap bitmap = null;
File directory = null;
try {
URL url = new URL(strURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
// InputStream input = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream()); //This bitmap is null always
directory = Environment.getExternalStorageDirectory();
// Create a new folder in SD Card
File dir = new File(Environment.getExternalStorageDirectory().getPath() + "/Profile");
if (!directory.exists() && !directory.isDirectory()) {
directory.mkdirs();
}
File mypath = new File(dir,"ProfileImage");
saveFile(mypath, bitmap);
} catch (MalformedURLException e) {
} catch (IOException e) {
}
return directory.getAbsolutePath();
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (result != null) {
imageprofile = result;
}
}
private void saveFile(File fileName, Bitmap bmp) {
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(fileName);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, outputStream); // 100 will be ignored
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
EDIT:
public class ImageUserTask extends AsyncTask<Void,Void,Bitmap> {
String strURL, imageprofile;
Bitmap mBitmap = null;
Context mContext;
private File profileFile;
public ImageUserTask(Context context, String url) {
this.strURL = url;
this.imageprofile = imageprofile;
this.mContext = context;
}
#Override
protected Bitmap doInBackground(Void... params) {
getImageFromUrl(strURL);
return mBitmap;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null) {
Bitmap bitmap = result;
}
}
public Bitmap getImageFromUrl(String urlString) {
try {
URL url = new URL(urlString);
try {
if(mBitmap!=null) {
mBitmap.recycle();
mBitmap=null;
}
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setDoInput(true);
//Connected to server
connection.connect();
//downloading image
InputStream input = connection.getInputStream();
mBitmap = BitmapFactory.decodeStream(input);
convertBitmapToFile(mBitmap, urlString);
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
return mBitmap;
}
public File convertBitmapToFile(Bitmap bitmap, String fileName) {
ContextWrapper cw = new ContextWrapper(mContext);
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
File mypath = new File(directory, fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mypath);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return mypath;
}
}
What can be the reason? I have added Internet permissions too. Please help. Thank you..

class DownloadFile extends AsyncTask<String, Integer, String> {
String strFolderName;
String shareType;
String downloadPath = "";
Activity mContext;
public DownloadFile(Activity mContext) {
this.mContext = mContext;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... aurl) {
int count;
try {
String fileName = "your filename with ext";
Log.d("TAG", fileName);
URL url = new URL("your url");
URLConnection conexion = url.openConnection();
conexion.connect();
String PATH = "your Path you want to store" + "/";
downloadPath = PATH + fileName;
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(downloadPath);
byte data[] = new byte[1024];
while ((count = input.read(data)) != -1) {
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String path) {
super.onPostExecute(path);
}
}
This code is work for me

Use the below methods
public Bitmap getImageFromUrl(String urlString) {
Bitmap bmp = null;
try {
URL url = new URL(urlString);
try {
if(bmp!=null) {
bmp.recycle();
bmp=null;
}
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
convertBitmapToFile(bmp, urlString);
} catch (IOException e) {
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}
return bmp;
}
public File convertBitmapToFile(Bitmap bitmap, String fileName) {
ContextWrapper cw = new ContextWrapper(activityRef.getApplicationContext());
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
File mypath = new File(directory, fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mypath);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
return mypath;
}
Add android Permissions for internet and Storage

Please try this
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;
}
}

Getting bitmap null while converting url to bitmap

I want to download the image from server and convert it to bitmap. I tried to download the image and convert it to bitmap but it returns null. I get bitmap as null.
To convert image to bitmap I have created one asyncTask.
Passing url to Async task :
String url = ServiceUrl.getBaseUrl() + ServiceUrl.getImageUserUrl() + profileImage;
Log.e("url", url);
new ImageUserTask(mContext, url, profileImage).execute();
ImageUserAsync Task:
public class ImageUserTask extends AsyncTask<Void, Void, Bitmap> {
String imageprofile;
private String url;
private Bitmap mBitmap;
private Context mContext;
public ImageUserTask(Context context, String url, String imageprofile) {
this.url = url;
this.imageprofile = imageprofile;
this.mContext = context;
}
#Override
protected Bitmap doInBackground(Void... params) {
try {
//Url
URL urlConnection = new URL(url);
//Conntecting httpUrlConnection
HttpURLConnection connection = (HttpURLConnection) urlConnection.openConnection();
connection.setDoInput(true);
//Connected to server
connection.connect();
//downloading image
InputStream input = connection.getInputStream();
//converting image to bitmap
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null) {
result = mBitmap;
new ImageServer(mContext).save(result);
}
}
}
EDIT :
Tried to use picasso :
#Override
protected void onPostExecute(JSONObject response) {
super.onPostExecute(response);
count=0;
if (response.has("message")) {
JSONObject userJson = null;
String message = null;
count++;
try {
if (response.getString("message").equalsIgnoreCase(KEY_SUCCESS)) {
Toast.makeText(mContext, "user authenticated successfully", Toast.LENGTH_LONG).show();
userJson = response.getJSONObject("user");
String userId = userJson.getString("user_id");
String userName = userJson.getString("user_name");
String profileImage = userJson.getString("profile_image");
String mobileNo = userJson.getString("mobile_no");
String url = ServiceUrl.getBaseUrl() + ServiceUrl.getImageUserUrl() + profileImage;
Log.e("url", url);
User user = new User();
user.setmUserId(userId);
user.setmUserName(userName);
user.setmProfileImage(profileImage);
user.setmMobileNo(mobileNo);
SharedPreferences.Editor editor = mContext.getSharedPreferences("username",mContext.MODE_PRIVATE).edit();
editor.putString("UserUsername",userName);
editor.commit();
Target target = new Target() {
#Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
try {
File f = new File(mContext.getCacheDir(), "Profile");
f.createNewFile();
//Convert bitmap to byte array
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
byte[] bitmapdata = bos.toByteArray();
//write the bytes in file
FileOutputStream fos = new FileOutputStream(f);
fos.write(bitmapdata);
fos.flush();
fos.close();
Log.e("File",String.valueOf(f));
}
catch (IOException e)
{
}
}
#Override
public void onBitmapFailed(Drawable errorDrawable) {
}
#Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
};
Picasso.with(mContext).load(url).into(target);
Toast.makeText(mContext, "user authenticated successfully", Toast.LENGTH_LONG).show();
progressDialog.dismiss();
mContext.startActivity(intent);
Picasso.with(mContext).cancelRequest(target);
}
}
What's going wrong?

Try this I am getting image by this method.
URL url1l = new URL("<Image url>");
URLConnection connection = url1l.openConnection();
connection.connect();
// this will be useful so that you can show a typical 0-100% progress bar
int fileLength = connection.getContentLength();
// download the file
InputStream is = new BufferedInputStream(connection.getInputStream());
bitmap = BitmapFactory.decodeStream(is);

The most likely reason is that you are getting an error from the server or that the data you are getting back cannot be decoded. First of all, check the response code after the connection is opened:
connection.connect();
int respCode = connection.getResponseCode();
Log.d("resp code", "response code " + respCode);
If you get anything other than 200, then something is wrong with retrieving data (wrong url, auth, or server error). If you do get 200, then the issue is with the data you are receiving. Read the data into a byte array and dump it into a file to examine.

First check with image is really exists or not as #aman grover said
if available use Picasso Lib to download image and from url.
here is sample code
private Target target = new Target() {
#Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
//Note : here you can get Bitmap
}
#Override
public void onBitmapFailed(Drawable errorDrawable) {
}
#Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
}
private void someMethod() {
Picasso.with(this).load("url").into(target);
}
#Override
public void onDestroy() { // could be in onPause or onStop
Picasso.with(this).cancelRequest(target);
super.onDestroy();
}

How do i get bitmap image from inputstream(base64 String) in android?

How do I get a bitmap image from InputStream(base64 String) in Android?
Below is my code:
protected Bitmap doInBackground(Void... params) {
Bitmap image;
URL url1 = null;
try {
url1 = new URL("http://sunnyfacemash.atwebpages.com/get.php"); // url
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
image = BitmapFactory.decodeStream(url1.openConnection().getInputStream());
return image;
} catch (IOException e) {
image = null;
e.printStackTrace();
}
return image;
}

Download stream to string, then use Base64.decode on it and feed this to BitmapFactory.
Use ByteArrayInputStream for factory