How to effectively load url remote image in ViewPager? - java

Usually we loading picture is on FragmentPagerAdapter.getItem method.
such as:
Picasso.with(context)
.load(url)
.placeholder(R.drawable.user_placeholder)
.error(R.drawable.user_placeholder_error).into(imageView);
Images then don't show in ViewPager probably never download. But, I want to pre-download images. I've used Picasso.with().load(url).downloadOnly, but this causes multiple unnecessary same url downloading.
I want to pre-download images. If have same url image downloading, it merge downloading interface.


I'm using Glide.It's effective and power.Preload image only use preload() method.

Related

How to detect if a URL has a file or not?

I'm using Glide to load images in image view from URLs.
If the image is not available in the server and URL doesn't exit/pointing a deleted file then the image view becomes blank..
How to know if URL has a image or not?
//do magic here if/else
Glide
.with(context)
.load(url)
.centerCrop()
.into(myImageView);
Thanks a lot in advance...

Use placeholder() or error() if your objective is to show some local image if the URL does not point to a valid image.
Use RequestListener if you want to learn about failures more generally.

Try out this way.
Glide.with(passContext)
.applyDefaultRequestOptions(
new RequestOptions()
.placeholder(R.drawable.ic_user_default)
.error(R.drawable.ic_user_default)
)
.load(url)
.into(imageview);

using glide with iocipher

I am using glide in order to set images in my GridView, and I am using a library named IOcipher which provides a virtual encrypted disk, so I use info.guardianproject.iocipher.File instead of java.io.file . But glide can't load images, and it has a error saying :
E/Glide: class com.bumptech.glide.load.engine.GlideException: Failed
to load resource
is there any way I could load images? I tried many different ways :(
file.getPath() returns /data/user/0/com.example.zeinab.amndoorbin/app_vfs/myfiles.db/1502685968291.jpg
Glide.with(mContext)
.load(file.getPath()) // Uri of the picture
.into(imageView);

Save image in SD card after picasso load image

I am using picasso plugin to load image.
Picasso.with(context).load(BackendConfig.media_url+folder+holder.media_name).resize(150, 150).into(holder.imageView);
It's working fine. But, I want to save that image in SD card by loading just once from URL.
How can I do that?

Picasso using LRU disk cache, no need to worry about loading it from URL once. If you need to load and save actual image as file, load it as bitmap resource instead, and use Bitmap.compress and FileOutputStream to save into file (PNG/JPEG/WEBP).

you can use this lightweight android library VINCI (wrot this for my self) its do every thing you want
caching - using LruCache
managing files/bitmaps (Saving files in internalStorage)
read this WIKI part for more visit my github repo .
Storage store = Vinci.base(context).process().load(uri).file();
Log.e("Created", Boolean.toString(store.isCreated()));
Log.e("FileObject", store.FileObject().toString());
Log.e("FullPath", store.getfullPath().getPath());
Log.e("LocalPath", store.LocalPath());
Log.e("Get Bitmap File", String.valueOf(store.getBitmap()));

Caching Zoomable Web Image

Aquery
Zoomable Web Image
In addition to ImageView, a WebView can be used to display an image along with Android build in zoom support for WebView. Image will be centered and fill the width or height of the webview depending on it's orientation.
I using,
String url1 = "file:///mnt/sdcard/image.jpg";
aq.id(R.id.webView1).progress(R.id.progress).webImage(url1);
I noticed that even if I cut off the connection and re-open that application, the image is still displayed. Is it cached? I looked into its sd card folder, nothing there. I'd like to utilize cached images instead of fetching it many times.
Also, I am both using Universal-Image-Loader and Android Query. I am just concern if they can both read cached images.
//Aquery
//returns the cached file by url, returns null if url is not cached
File file = aq.getCachedFile(url);

The url1 is being downloaded every time you call
aq.id(R.id.webView1).progress(R.id.progress).webImage(url1);
Your cached file is being returned to File file object but you arent making use of it in

GWT Image setUrl()

i am using - and new to - GWT and i made an Image Widget to view an image. This image is found on my file system i wrote.
String src = "file:///D:/myfolder/myfile.jpg";
Image image = new Image();
image.setUrl(src);
but image doesn't appear!

You should specify either the whole URL (http://www.example.com/img/myfile.jpg) or (better yet) just relative to the root: /img/myfile.jpg. And, of course, you have to place your images in your WAR directory.
That's the simple setup. If you have more images and want to optimize fetching them (many images -> many requests to the server), have a look at the ClientBundle.

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