We Keep Coding

getting a Bitmap from a Uri

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_image);
imageView = (ImageView) findViewById(R.id.imageView);
Intent intent = getIntent();
Uri imageUri = intent.getData();
// Picasso.with(this).load(imageUri).into(imageView);
if(imageUri == null){
Log.d(TAG, "Check");
}
//BitmapFactory.Options options = new BitmapFactory.Options();
// options.inSampleSize = 8;
// bm = MediaStore.Images.Media.getBitmap(getContentResolver(),imageUri);
Bitmap bm = null;
try{
InputStream image;
try{
image = getContentResolver().openInputStream(imageUri);
bm = BitmapFactory.decodeStream(image);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
catch (Exception e){
e.printStackTrace();
}
//BitmapFactory.Options options = new BitmapFactory.Options();
// bm = BitmapFactory.decodeFile(file.getAbsolutePath(),options);
if ((bm == null)) {
prints("It doesn't work");
}
//Log.d(TAG,"Going to convert image.");
imageView.setImageBitmap(bm);
I've looked at a bunch of StackOverFlow questions, I've tried them all as you can see in the commented code. I'm trying to get a Bitmap that is unchanged when the photo is taken. The pixel position of the Bitmap is crucial for my goal. The image is high quality and maybe a larger file. My Bitmap is always null, I have made sure my Uri isn't. Any ideas?

I think the code below will help you
private void setImage(String path, CircleImageView img) {
options = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.cacheOnDisk(true)
.considerExifParams(true)
.bitmapConfig(Bitmap.Config.RGB_565)
.showImageOnLoading(R.drawable.user)
.showImageForEmptyUri(R.drawable.user)
.showImageOnFail(R.drawable.user)
.build();
ImageLoader.getInstance().displayImage(path, img, options, new SimpleImageLoadingListener() {
#Override
public void onLoadingStarted(String imageUri, View view) {
super.onLoadingStarted(imageUri, view);
}
#Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
super.onLoadingFailed(imageUri, view, failReason);
}
#Override
public void onLoadingCancelled(String imageUri, View view) {
super.onLoadingCancelled(imageUri, view);
}
#Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
super.onLoadingComplete(imageUri, view, loadedImage);
}
}, new ImageLoadingProgressListener() {
#Override
public void onProgressUpdate(String s, View view, int i, int i1) {
}
});
}
use universal image loader for SimpleImageLoadingListener()

The file has a too big resolution to make a bitmap out of it. There is not enough memory to construct a bitmap and hence a null is returned.
Try with a very small image file to see.

You can direct get Bitmap from URI if it is from your mobile storage from below code.
public Bitmap getBitmapFromURI(Uri uri){
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getActivity().getContentResolver().query(uri, filePathColumn, null, null, null);
if(cursor!=null){
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
File f_image = new File(cursor.getString(columnIndex));
cursor.close();
BitmapFactory.Options o2 = new BitmapFactory.Options();
return BitmapFactory.decodeFile(f_image.getAbsolutePath(), o2);
}
return null;
}
In case of file is too large to load.. You need to compress image and show. For that you need to use Async Task as well.
I have made one Image compressor task you can use it for large image
public class ConvertBase64Task extends AsyncTask<Void, Bitmap, Bitmap> {
private ByteArrayOutputStream baos = new ByteArrayOutputStream();
private File file;
private int CompressionRatio = 80; //You can change it by what ever ratio you want. in 0 to 100.
private boolean shouldrotate = true;
private ImageCompressiorListner imageCompressiorListner;
public ConvertBase64Task(File file) {
this.file = file;
}
public void setRotation(boolean isRotate) {
shouldrotate = isRotate;
}
public void setCompressionRatio(int Ratio) {
CompressionRatio = Ratio;
}
public void setImageCompressiorListner(ImageCompressiorListner imageCompressiorListner) {
this.imageCompressiorListner = imageCompressiorListner;
}
#Override
protected void onPreExecute(){
}
#Override
protected Bitmap doInBackground(Void... params) {
try {
//***** Fatching file
//*****Code for Orientation
Matrix matrix = new Matrix();
if (shouldrotate) {
ExifInterface exif1 = new ExifInterface(file.getAbsolutePath());
int orientation = exif1.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 1);
Log.d("EXIF", "Exif: " + orientation);
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
} else {
matrix.postRotate(0);
}
} else {
matrix.postRotate(0);
}
try {
BitmapFactory.Options option = new BitmapFactory.Options();
option.inJustDecodeBounds = true;
BitmapFactory.decodeFile(file.getAbsolutePath(), option);
int file_size = Integer.parseInt(String.valueOf(file.length() / 1024));
Log.e("ImageSize", "" + file_size);
int scale = 1;
if (file_size < 512) {
Log.e("image size is good", "image size is less");
} else if (file_size < 1024) {
Log.e("image size is 1 mb", "image size is heavy");
scale = 2;
} else if (file_size < 1536) {
Log.e("image size is 1.5 mb", "image size is heavy");
scale = 2;
} else if (file_size < 2048) {
Log.e("image size is 2 mb", "image size is heavy");
scale = 4;
} else {
Log.e("image size > 2 mb", "image size is heavy");
scale = 4;
}
Log.e("Scale", "Finaly Scaling with " + scale);
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
Bitmap pickimg = BitmapFactory.decodeFile(file.getAbsolutePath(), o2);
if (pickimg.getWidth() > 1280 || pickimg.getHeight() > 1000) {
int width = pickimg.getWidth();
int height = pickimg.getHeight();
while (width > 1280 || height > 700) {
width = (width * 90) / 100;
height = (height * 90) / 100;
}
pickimg = Bitmap.createScaledBitmap(pickimg, width, height, true);
} else {
pickimg = Bitmap.createBitmap(pickimg, 0, 0, pickimg.getWidth(), pickimg.getHeight(), matrix, true); // rotating bitmap
}
pickimg.compress(Bitmap.CompressFormat.JPEG, CompressionRatio, baos);
return pickimg;
} catch (OutOfMemoryError e) {
e.printStackTrace();
return null;
} catch (Exception e) {
e.printStackTrace();
return null;
}
} catch (Throwable e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (result != null) {
if(imageCompressiorListner!=null){
imageCompressiorListner.onImageCompressed(result);
}
} else {
if(imageCompressiorListner!=null){
imageCompressiorListner.onError();
}
}
}
public interface ImageCompressiorListner {
void onImageCompressed(Bitmap bitmap);
void onError();
}
}
You can use this as below
ConvertBase64Task task = new ConvertBase64Task(File Object of Image);
task.setImageCompressiorListner(new ConvertBase64Task.ImageCompressiorListner() {
#Override
public void onImageCompressed(Bitmap bitmap) {
}
#Override
public void onError() {
}
});
task.execute();
Hope this will help you out.

NullPointerException on ImageView inside Adapter

I am using ViewPager to hold my Fragments. I have two Fragments with different Parse Queries. One of My Fragment has grid view layout. I have created and Adapter for the GridView to load images.
This is my fragment
public class FeedsFragment extends Fragment {
GridView gridview;
List<ParseObject> ob;
FeedsGridAdapter adapter;
private List<ParseFeeds> phonearraylist = null;
View rootView;
public static final String TAG = FeedsFragment.class.getSimpleName();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.feeds_layout,
container, false);
new RemoteDataTask().execute();
return rootView;
}
private class RemoteDataTask extends AsyncTask<Void,Void,Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... params) {
// Create the array
phonearraylist = new ArrayList<ParseFeeds>();
try {
// Locate the class table named "SamsungPhones" in Parse.com
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(
"AroundMe");
// Locate the column named "position" in Parse.com and order list
// by ascending
// query.whereEqualTo(ParseConstants.KEY_RECIPIENT_IDS, ParseUser.getCurrentUser().getUsername());
query.orderByAscending("createdAt");
ob = query.find();
for (ParseObject country : ob) {
ParseFile image = (ParseFile) country.get("videoThumbs");
ParseFeeds map = new ParseFeeds();
map.setPhone(image.getUrl());
phonearraylist.add(map);
}
} catch (ParseException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// Locate the gridview in gridview_main.xml
gridview = (GridView) rootView.findViewById(R.id.gridview);
// Pass the results into ListViewAdapter.java
adapter = new FeedsGridAdapter(FeedsFragment.this.getActivity(),
phonearraylist);
// Binds the Adapter to the ListView
gridview.setAdapter(adapter);
}
}
}
The Adapter I created to load the images into
public static final String TAG = FeedsGridAdapter.class.getSimpleName();
// Declare Variables
Context context;
LayoutInflater inflater;
ImageLoader imageLoader;
private List<ParseFeeds> phonearraylist = null;
private ArrayList<ParseFeeds> arraylist;
public FeedsGridAdapter(Context context, List<ParseFeeds> phonearraylist) {
this.context = context;
this.phonearraylist = phonearraylist;
inflater = LayoutInflater.from(context);
this.arraylist = new ArrayList<ParseFeeds>();
this.arraylist.addAll(phonearraylist);
imageLoader = new ImageLoader(context);
}
public class ViewHolder {
ImageView phone;
}
#Override
public int getCount() {
return phonearraylist.size();
}
#Override
public Object getItem(int position) {
return phonearraylist.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder holder;
if (view == null) {
holder = new ViewHolder();
view = inflater.inflate(R.layout.feeds_layout, null);
// Locate the ImageView in gridview_item.xml
holder.phone = (ImageView) view.findViewById(R.id.videoThumb);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
// Load image into GridView
imageLoader.DisplayImage(phonearraylist.get(position).getPhone(),
holder.phone);
// Capture GridView item click
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// Send single item click data to SingleItemView Class
Intent intent = new Intent(context, SingleVideoView.class);
// Pass all data phone
intent.putExtra("phone", phonearraylist.get(position)
.getPhone());
context.startActivity(intent);
}
});
return view;
}
}
Here its giving me NullPointerException on imageLoader.DisplayImage(phonearraylist.get(position).getPhone(),
holder.phone);
When I run the same code in another project with only one Fragment its working but when I use it in my current project with Two Fargments having different parse queries it gives me NullPointerException.Please help I wasted around 5 days on this to get it working tried everything possible at my end.
Here is my ImageLoader Class
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
// Handler to display images in UI thread
Handler handler = new Handler();
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
// int stub_id = ;
public void DisplayImage(String url, ImageView imageView) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
imageView.setImageResource(R.drawable.camera_iris);
}
}
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);
Bitmap b = decodeFile(f);
if (b != null)
return b;
// Download Images from the Internet
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 = 100;
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(R.drawable.camera_iris);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}

There is a NullPointerException imageLoader.DisplayImage(phonearraylist.get(position).getPhone(), holder.phone);
Which leads to a suspiciously null (ImageView) holder.phone.
Why it must be null ?
Because it might not be lying inside the view you inflated to.
So
You should check if you are inflating a proper layout from resource and not making any of the most common mistakes like using activity/fragment's layout resource instead of using adapter's item layout.
You're welcome.

ImageLoader Initialize like below way
DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder()
.cacheOnDisc()//.imageScaleType(ImageScaleType.EXACTLY)
.bitmapConfig(Bitmap.Config.RGB_565).build();
ImageLoaderConfiguration.Builder builder = new ImageLoaderConfiguration.Builder(
this).defaultDisplayImageOptions(defaultOptions).memoryCache(
new WeakMemoryCache());
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
ImageLoaderConfiguration config = builder.build();
imageLoader = ImageLoader.getInstance();
imageLoader.init(config);

Imageloader for displaying the Image in an activity

Check this URL I am USING :: http://54.218.73.244:7006/DescriptionSortedRating/
Images will append with relative path from JSON out put using restaurantIMAGE
EX::
http://54.218.73.244:7006/CopperChimney1.jpg
I am using restaurantIMAGE from JSON
{
"restaurants": [
{
"restaurantID": 4,
"restaurantNAME": "CopperChimney1",
"restaurantIMAGE": "MarkBoulevard1.jpg",
"restaurantDISTANCE": 15,
"restaurantTYPE": "Indian",
"restaurantRATING": 1,
"restaurantPrice": 11,
"restaurantTime": "9am t0 8pm"
},
{
"restaurantID": 1,
"restaurantNAME": "CopperChimney",
"restaurantIMAGE": "CopperChimney.png",
"restaurantDISTANCE": 5,
"restaurantTYPE": "Indian",
"restaurantRATING": 3,
"restaurantPrice": 20,
"restaurantTime": "8pm to 11pm"
},
I am USING IMAGE LOADER
ImageLoader.java
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
// Handler to display images in UI thread
Handler handler = new Handler();
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.temp_img;
public void DisplayImage(String url, ImageView imageView) {
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);
Bitmap b = decodeFile(f);
if (b != null)
return b;
// Download Images from the Internet
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.
// Recommended Size 512
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();
}
}
Utils,FileCache,MemoryCache java files are also there
RestaurantDescPhotos.java
public class RestaurantDescPhotos extends Activity {
// url to make request
private static String url = "http://54.218.73.244:7006/DescriptionSortedRating/";
String restaurant_name, cc_res;
ProgressDialog progressDialog;
JSONObject jsonObject;
JSONArray first_array;
ImageLoader imageLoader;
TextView textView;
TextView text;
private SparseArray<String> imagesMap = new SparseArray<String>();
ArrayList<HashMap<String, String>> list_of_images = new ArrayList<HashMap<String, String>>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.restaurant_desc_photos);
imageLoader=new ImageLoader(RestaurantDescPhotos.this);
progressDialog = new ProgressDialog(RestaurantDescPhotos.this);
new ParsingAsync().execute();
}
private class ParsingAsync extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = ProgressDialog.show(RestaurantDescPhotos.this, "",
"Please Wait", true, false);
}
#Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
String _response = null;
try {
HttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter(
CoreProtocolPNames.PROTOCOL_VERSION,
HttpVersion.HTTP_1_1);
HttpGet request = new HttpGet(url);
HttpResponse response = httpclient.execute(request);
HttpEntity resEntity = response.getEntity();
_response = EntityUtils.toString(resEntity);
jsonObject = new JSONObject(_response);
first_array = jsonObject.getJSONArray("restaurants");
} catch (JSONException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
progressDialog.dismiss();
// TextView timedisplay=(TextView)
// findViewById(R.id.RestaurantTimeID);
for (int i = 0; i < first_array.length(); i++) {
try {
JSONObject detail_obj = first_array.getJSONObject(i);
HashMap<String, String> map_for_images = new HashMap<String, String>();
int id = detail_obj.getInt("_id");
String IMAGES = "http://54.218.73.244:7006/"+detail_obj.getString("restaurantIMAGE");
map_for_images.put("Starters", IMAGES);
list_of_images.add(map_for_images);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
ImageView imageView = (ImageView) findViewById(R.id.DISP_IMG);
imageLoader.DisplayImage(url, imageView);
}
}
}
I am facing the problems in setting the images onto image view using image loader
There is some problem in RestaurantDescPhotos.java ... I am not able to figure it out
Any Ideas

The url content is not a valid image url:
imageLoader.DisplayImage(url, imageView);
I tried a fixed image url, and image is loaded successfully:
String path = "http://54.218.73.244:7006/CopperChimney1.jpg";
imageLoader.DisplayImage(path, imageView);

Getting image from the Internet and setting to ImageView

I have an ImageView called tab1. My code looks this.
import java.io.InputStream;
import java.net.URL;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.Toast;
public class Paikallissaa extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TabHost tabs = (TabHost) findViewById(R.id.tabhost);
tabs.setup();
TabHost.TabSpec spec = tabs.newTabSpec("tag1");
try {
ImageView iv = (ImageView) findViewById(R.id.tab1);
URL url = new URL("http://cdn.fmi.fi/weather-observations/products/finland/finland-weather-observations-map.png");
InputStream content = (InputStream) url.getContent();
Drawable d = Drawable.createFromStream(content, "src");
iv.setImageDrawable(d);
} catch (Exception e) {
Toast.makeText(this, "Error getting image: " + e, Toast.LENGTH_SHORT);
}
spec.setContent(R.id.tab1);
spec.setIndicator("Koko maa");
tabs.addTab(spec);
spec = tabs.newTabSpec("tag2");
spec.setContent(R.id.tab2);
spec.setIndicator("Raisio");
tabs.addTab(spec);
}
}
(Ash I suck with the code block thing...)
It wont update the image. What's wrong? It keeps showing the image I set there earlier in main.xml.

To do this i've been using a helper class that i found somewhere on the internet and modified a tiny bit. It takes care of caching the image and loading the image on a background thread.
Since your image changes on the server you might want to remove the caching portion of this code.
Usage:
ImageLoader loader = new ImageLoader(this);
loader.DisplayImage(String.format(headshotUrl, data.Id), this, headshot);
here it is:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Stack;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.widget.ImageView;
public class ImageLoader
{
public static String TAG = "xxx";
// the simplest in-memory cache implementation. This should be replaced with
// something like SoftReference or BitmapOptions.inPurgeable(since 1.6)
private HashMap<String, Bitmap> cache = new HashMap<String, Bitmap>();
private File cacheDir;
public ImageLoader(Context context)
{
photoLoaderThread.setPriority(Thread.NORM_PRIORITY - 1);
cacheDir = Utilities.GetCacheDir(context);
}
final int stub_id = R.drawable.face_placeholder;
public void DisplayImage(String url, Activity activity, ImageView imageView)
{
imageView.setTag(url);
Log.i(TAG, url);
if (cache.containsKey(url))
imageView.setImageBitmap(cache.get(url));
else
{
queuePhoto(url, activity, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, Activity activity, ImageView imageView)
{
// This ImageView may be used for other images before. So there may be
// some old tasks in the queue. We need to discard them.
photosQueue.Clean(imageView);
PhotoToLoad p = new PhotoToLoad(url, imageView);
synchronized (photosQueue.photosToLoad)
{
photosQueue.photosToLoad.push(p);
photosQueue.photosToLoad.notifyAll();
}
// start thread if it's not started yet
if (photoLoaderThread.getState() == Thread.State.NEW)
photoLoaderThread.start();
}
private Bitmap getBitmap(String url)
{
// I identify images by hashcode. Not a perfect solution, good for the
// demo.
String filename = String.valueOf(url.hashCode());
File f = new File(cacheDir, filename);
// from SD cache
Bitmap b = decodeFile(f);
if (b != null)
return b;
// from web
try
{
Bitmap bitmap = null;
InputStream is = new URL(url).openStream();
OutputStream os = new FileOutputStream(f);
Utilities.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Exception ex)
{
ex.printStackTrace();
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;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// 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;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException 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;
}
}
PhotosQueue photosQueue = new PhotosQueue();
public void stopThread()
{
photoLoaderThread.interrupt();
}
// stores list of photos to download
class PhotosQueue
{
private Stack<PhotoToLoad> photosToLoad = new Stack<PhotoToLoad>();
// removes all instances of this ImageView
public void Clean(ImageView image)
{
for (int j = 0; j < photosToLoad.size();)
{
if (photosToLoad.get(j).imageView == image)
photosToLoad.remove(j);
else
++j;
}
};
}
class PhotosLoader extends Thread
{
public void run()
{
try
{
while (true)
{
// thread waits until there are any images to load in the
// queue
if (photosQueue.photosToLoad.size() == 0)
synchronized (photosQueue.photosToLoad)
{
photosQueue.photosToLoad.wait();
}
if (photosQueue.photosToLoad.size() != 0)
{
PhotoToLoad photoToLoad;
synchronized (photosQueue.photosToLoad)
{
photoToLoad = photosQueue.photosToLoad.pop();
}
Bitmap bmp = getBitmap(photoToLoad.url);
cache.put(photoToLoad.url, bmp);
Object tag = photoToLoad.imageView.getTag();
if (tag != null && ((String) tag).equals(photoToLoad.url))
{
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad.imageView);
Activity a = (Activity) photoToLoad.imageView.getContext();
a.runOnUiThread(bd);
}
}
if (Thread.interrupted())
break;
}
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
PhotosLoader photoLoaderThread = new PhotosLoader();
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable
{
Bitmap bitmap;
ImageView imageView;
public BitmapDisplayer(Bitmap b, ImageView i)
{
bitmap = b;
imageView = i;
}
public void run()
{
Log.i(TAG, "BitmapDisplayer run()");
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else
imageView.setImageResource(stub_id);
}
}
public void clearCache()
{
// clear memory cache
cache.clear();
// clear SD cache
File[] files = cacheDir.listFiles();
for (File f : files)
f.delete();
}
}
in a utility class i have my GetCacheDir(...)
public static File GetCacheDir(Context context)
{
File cacheDir;
if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
cacheDir = new File(android.os.Environment.getExternalStorageDirectory(), "com.example.app");
else
cacheDir = context.getCacheDir();
if (!cacheDir.exists())
cacheDir.mkdirs();
return cacheDir;
}
CopyStream function:
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)
{
}
}

To get the image from the internet try the following,
HttpGet httpRequest = new HttpGet(URI.create("http://cdn.fmi.fi/weather-observations/products/finland/finland-weather-observations-map.png") );
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity);
bmp = BitmapFactory.decodeStream(bufHttpEntity.getContent());
ImageView iv = (ImageView) findViewById(R.id.tab1);
iv.setImageBitmat(bmp);
httpRequest.abort();

This will download an image and set it to an image view, taken from an app I helped write. I stripped out some of the useless code that I was using, but the methods remain the same.
public void setImage(){
imageView.setImageURI(DownloadImage);
}
public String DownloadImage(){
string filepath = DownloadFromUrl("url","filename.png");
}
public String DownloadFromUrl(String imageURL, String fileName) {
File file = new File(PATH + fileName);
try {
URL url = new URL(imageURL);
long startTime = System.currentTimeMillis();
Log.d("ImageManager", "download begining");
Log.d("ImageManager", "download url:" + url);
Log.d("ImageManager", "downloaded file name:" + fileName);
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(50);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = new FileOutputStream(file);
fos.write(baf.toByteArray());
fos.close();
Log.d("ImageManager",
"download ready in"
+ ((System.currentTimeMillis() - startTime) / 1000)
+ " sec");
} catch (IOException e) {
Log.d("ImageManager", "Error: " + e);
}
return file.toString();
}

Store HashMap on SD card

I want to store the HashMap object in a file on SD card. So, that the same object is used again on application restart. I have no idea how to do this, please provide me a brief summary.
For example, I want the LazyList of images that is saved in HashMap to be stored in a file on SD card. So, that images are downloaded once and never need to be downloaded again.
I am including the LazyList code where I need to implement such scenario:
package com.gogozing.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Stack;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.Environment;
import android.widget.ImageView;
import com.abc.app.R;
public class ImageLoader {
// the simplest in-memory cache implementation. This should be replaced with
// something like SoftReference or BitmapOptions.inPurgeable(since 1.6)
private HashMap<String, Bitmap> cache = new HashMap<String, Bitmap>();
private File cacheDir;
public ImageLoader(Context context) {
// Make the background thead low priority. This way it will not affect
// the UI performance
photoLoaderThread.setPriority(Thread.NORM_PRIORITY - 1);
//String path = Environment.getExternalStorageDirectory().toString();
//OutputStream fOut = null;
//File cacheDir = new File(path, "LazyList");
// try {
// fOut = new FileOutputStream(cacheDir);
// } catch (FileNotFoundException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
// Find the dir to save cached images
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED))
cacheDir = new File(
android.os.Environment.getExternalStorageDirectory(),
"LazyList");
else
cacheDir = context.getCacheDir();
if (!cacheDir.exists())
cacheDir.mkdirs();
}
final int stub_id = R.drawable.no_image;
public void DisplayImage(String url, Activity activity, ImageView imageView) {
if (cache.containsKey(url))
imageView.setImageBitmap(cache.get(url));
else {
queuePhoto(url, activity, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, Activity activity, ImageView imageView) {
// This ImageView may be used for other images before. So there may be
// some old tasks in the queue. We need to discard them.
photosQueue.Clean(imageView);
PhotoToLoad p = new PhotoToLoad(url, imageView);
synchronized (photosQueue.photosToLoad) {
photosQueue.photosToLoad.push(p);
photosQueue.photosToLoad.notifyAll();
}
// start thread if it's not started yet
if (photoLoaderThread.getState() == Thread.State.NEW)
photoLoaderThread.start();
}
private Bitmap getBitmap(String url) {
// // I identify images by hashcode. Not a perfect solution, good for
// the
// // demo.
// String filename = String.valueOf(url.hashCode());
// File f = new File(cacheDir, filename);
//
// // from SD cache
// Bitmap b = decodeFile(f);
// if (b != null)
// return b;
// from web
try {
return new BitmapDrawable(new URL(url).openStream()).getBitmap();
} catch (Exception ex) {
ex.printStackTrace();
cache.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;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// 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++;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
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;
}
}
PhotosQueue photosQueue = new PhotosQueue();
public void stopThread() {
photoLoaderThread.interrupt();
}
// stores list of photos to download
class PhotosQueue {
private Stack<PhotoToLoad> photosToLoad = new Stack<PhotoToLoad>();
// removes all instances of this ImageView
public void Clean(ImageView image) {
for (int j = 0; j < photosToLoad.size();) {
if (photosToLoad.get(j).imageView == image)
photosToLoad.remove(j);
else
++j;
}
}
}
class PhotosLoader extends Thread {
public void run() {
try {
while (true) {
// thread waits until there are any images to load in the
// queue
if (photosQueue.photosToLoad.size() == 0)
synchronized (photosQueue.photosToLoad) {
photosQueue.photosToLoad.wait();
}
if (photosQueue.photosToLoad.size() != 0) {
PhotoToLoad photoToLoad;
synchronized (photosQueue.photosToLoad) {
photoToLoad = photosQueue.photosToLoad.pop();
}
Bitmap bmp = getBitmap(photoToLoad.url);
cache.put(photoToLoad.url, bmp);
if (photoToLoad.url == null) {
} else {
if (((String) photoToLoad.imageView.getTag())
.equals(photoToLoad.url)) {
BitmapDisplayer bd = new BitmapDisplayer(bmp,
photoToLoad.imageView);
Activity a = (Activity) photoToLoad.imageView
.getContext();
a.runOnUiThread(bd);
}
}
}
if (Thread.interrupted())
break;
}
} catch (InterruptedException e) {
// allow thread to exit
}
}
}
PhotosLoader photoLoaderThread = new PhotosLoader();
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
ImageView imageView;
public BitmapDisplayer(Bitmap b, ImageView i) {
bitmap = b;
imageView = i;
}
public void run() {
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else
imageView.setImageResource(stub_id);
}
}
public void clearCache() {
// clear memory cache
cache.clear();
// clear SD cache
File[] files = cacheDir.listFiles();
for (File f : files)
f.delete();
}
}

All objects in the HashMap must be Serializable, then you should be able to just serialize the map with something like
try {
ObjectOutputStream out = new ObjectOutputStream(...);
out.writeObject(yourMap);
out.close();
} catch(IOException ex) {
...
}
However you have bitmaps in your map, and bitmaps makes little sense to serialize like that. You should rather just save your jpg/png/etc files to the phone memory or sd-card, and read them from there on the next application start.