Develop Reference

Android. Can't decode Bitmap from stream

I have URL to PNG image file.
I want to get this image file and set it as a source for an ImageView.
My code:
URL iconURL = null;
try {
iconURL = new URL("https://maps.gstatic.com/mapfiles/place_api/icons/worship_general-71.png");
} catch (MalformedURLException e) {
e.printStackTrace();
}
Bitmap icon = null;
try {
icon = BitmapFactory.decodeStream(iconURL.openConnection().getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
myImageView.setImageBitmap(icon);
If I place a breakpoint into the line with decodeStream() the app stops and I see the following:
If I run the app in regular mode, it just stops!
Can someone explain what is wrong here and how to do it correctly?
Thanks.

If you just want to show the image on your ImageView then you can use Picasso Library.
Put below dependency in build.gradle file
'com.squareup.picasso:picasso:2.71828'
And use below java code for loading your image from URL to your ImageView
Picasso.get()
.load(url)
.into(imageView);

Android - How to get current wallpaper name

I'm developing an application that sets wallpapers from com.android.launcher3 package drawable resources. At some point I need to check if the wallpaper is set correctly so I can move on to other step.
After some research in SO and googling, I wasn't able to find any information about getting current wallpaper name.
Here is how I set the drawable which I have no problem:
try {
WallpaperManager wallpaper_manager = WallpaperManager.getInstance(m_context);
Resources res = m_context.getPackageManager().getResourcesForApplication("com.android.launcher3");
int drawable_id = res.getIdentifier(wallpaper_name, "drawable", "com.android.launcher3");
Drawable drawable = res.getDrawable(drawable_id, null);
if(drawable != null) {
wallpaper_manager.setBitmap(((BitmapDrawable)drawable).getBitmap());
}
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
I can get the current wallpaper as drawable as well:
WallpaperManager wallpaper_manager = WallpaperManager.getInstance(m_context);
Drawable drawable = wallpaper_manager.getDrawable();
but I haven't managed to get current wallpaper name.
I need help.
Thanks in advance.

I would try this two options:
1. Using wallpaperManager
You shouold be able to get the information using this:
wallpaperManager.getWallpaperInfo();
This will return a WallpaperInfo object which contains all the data about the wallpaper.
More information
https://developer.android.com/reference/android/app/WallpaperManager.html
2. Getting the drawable file
You can also try to get the URI of the drawable like this:
String imageUri = "drawable://" + R.drawable.image;
And get the file name from there.
Hope it helps you.

Retrieve filename from a web folder

I am using AsyncTask to download a file from a web folder. However, the name of the file will be different every time.
Is there a way to get the name of the file in a web folder? (There will be only 1 file in that folder at a given time).
http://www.example.com/myfolder/myfile_1

Try the ApacheURLLister (I didn't tested it but it may work):
URL url;
List serverDir = null;
try {
url = new URL("http://www.abc.com/myfolder/");
ApacheURLLister lister = new ApacheURLLister();
serverDir = lister.listAll(url);
}
catch (Exception e) {
e.printStackTrace();
Log.e("ERROR ON GETTING FILE","Error is " +e);
}
System.out.println(serverDir);
return serverDir;

Get R.drawable ID's dynamically in android

I have a folder with a few images, these images are added by user dynamically. So i need to get the R.drawable ID's of these images in android.... ???

Where are you saving these images too? When images are being added dynamically at runtime usually you need to store them on the phones storage. If you want the images to be stored in the external storage (SDCard) then you can use the following code to retrieve them and add them to your view (Which I assume your doing). This code assumes the images are being stored to your devices SDCard, which is where they will be pulled from.
//Get root directory of storage directory, pass in the name of the Folder if they are being stored farther down, i.e getExternalFilesDir("FolderName/FolderName2")
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
File dir = getExternalFilesDir(null);
Bitmap bmap = null;
try {
InputStream is = new FileInputStream(new File(dir,"image.jpg"));
bmap = BitmapFactory.decodeStream(is);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if (bmap!=null) {
ImageView view = new ImageView(this);
view.setImageBitmap(bmap);
}
}

Android Show image by path

i want to show image in imageview without using id.
i will place all images in raw folder and open
try {
String ss = "res/raw/images/inrax/3150-MCM.jpg";
in = new FileInputStream(ss);
buf = new BufferedInputStream(in);
Bitmap bMap = BitmapFactory.decodeStream(buf);
image.setImageBitmap(bMap);
if (in != null) {
in.close();
}
if (buf != null) {
buf.close();
}
} catch (Exception e) {
Log.e("Error reading file", e.toString());
}
but this is not working i want to access image using its path not by name

read a stream of bytes using openRawResource()
some thing like this should work
InputStream is = context.getResources().openRawResource(R.raw.urfilename);
Check this link
http://developer.android.com/guide/topics/resources/accessing-resources.html#ResourcesFromCode
It clearly says the following
While uncommon, you might need access your original files and directories. If you do, then saving your files in res/ won't work for you, because the only way to read a resource from res/ is with the resource ID
If you want to give a file name like the one mentioned in ur code probably you need to save it on assets folder.

You might be able to use Resources.getIdentifier(name, type, package) with raw files. This'll get the id for you and then you can just continue with setImageResource(id) or whatever.
int id = getResources().getIdentifier("3150-MCM", "raw", getPackageName());
if (id != 0) //if it's zero then its not valid
image.setImageResource(id);
is what you want? It might not like the multiple folders though, but worth a try.

try {
// Get reference to AssetManager
AssetManager mngr = getAssets();
// Create an input stream to read from the asset folder
InputStream ins = mngr.open(imdir);
// Convert the input stream into a bitmap
img = BitmapFactory.decodeStream(ins);
} catch (final IOException e) {
e.printStackTrace();
}
here image directory is path of assets
like
assest -> image -> somefolder -> some.jpg
then path will be
image/somefolder/some.jpg
now no need of resource id for image , you can populate image on runtime using this