Develop Reference

How to make Glide use previously downloaded image as placeholder

Is it possible to show previously downloaded image in Glide as placeholder while downloading new image.
Like I have an image loaded in imageview using glide. Now the imageurl is changed, so while loading this new image is it possible to keep displaying the old image (might be from cache).
What I want is while the new image is being loaded from the URL, is it possible to keep the current image as placeholder.

I found the answer to this in the discussion here - https://github.com/bumptech/glide/issues/527#issuecomment-148840717.
Intuitively I also thought of using placeholder(), but the problem is that as soon as you load the second image, you loose the reference to the first one. You can still reference it but it is not safe as it may be reused by Glide or recycled.
The proposed solution from the discussion is to use thumbnail() and load the first image again. The load will return the first image immediately from the memory cache and it will look as if the image did not change until the second image is loaded:
String currentImageUrl = ...;
String newImageUrl = ...;
Glide.with(this)
.load(newImageUrl)
.thumbnail(Glide.with(this)
.load(currentImageUrl)
.fitCenter()
)
.fitCenter()
.into(imageView);

Glide have a capability of getting the bitmap of the image from that url, so just get it and then save it to a desired storage into your phone, and after that in your .placeholder() just use that bitmap when you are trying to get another image , take a look at this snippet
/** Download the image using Glide **/
Bitmap theBitmap = null;
theBitmap = Glide.
with(YourActivity.this).
asBitmap().
load("Url of your image").
into(-1, -1).
get(); //with this we get the bitmap of that url
saveToInternalStorage(theBitmap, getApplicationContext(), "your preferred image name");
/** Save it on your device **/
public String saveToInternalStorage(Bitmap bitmapImage, Context context, String name){
ContextWrapper cw = new ContextWrapper(context);
// path to /data/data/yourapp/app_data/imageDir
String name_="foldername"; //Folder name in device android/data/
File directory = cw.getDir(name, Context.MODE_PRIVATE);
// Create imageDir
File mypath=new File(directory,name_);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mypath);
// Use the compress method on the BitMap object to write image to the OutputStream
bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
Log.e("absolutepath ", directory.getAbsolutePath());
return directory.getAbsolutePath();
}
/** Method to retrieve image from your device **/
public Bitmap loadImageFromStorage(String path, String name)
{
Bitmap b;
String name_= name; //your folderName
try {
File f=new File(path, name_);
b = BitmapFactory.decodeStream(new FileInputStream(f));
return b;
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
return null;
}
/** Retrieve your image from device and set to imageview **/
//Provide your image path and name of the image your previously used.
Bitmap b= loadImageFromStorage(String path, String name)
ImageView img=(ImageView)findViewById(R.id.your_image_id);
img.setImageBitmap(b);

Displaying from external storage?

I have an image saved in my Pictures folder, how to display it in a imageview?
like:
imageview.setimage("//Pictures//cat.jpg)
I know it's not a correct code, but I want to achieve something like this, hope someone can help, thanks!

you first generate a bitmap from file path and then put that bitmap to imageview
File image = new File(filePath);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
bitmap = Bitmap.createScaledBitmap(bitmap,parent.getWidth(),parent.getHeight(),true);
imageView.setImageBitmap(bitmap);
Edit: Also add this permission in your manifest
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

You can set image like this from the sd card get path and create file variable and decode file using BitmapFactory set imageview image
String path = Environment.getExternalStorageState()+"/Pictures//cat.jpg";
File f = new File(path);
imageview.setImageBitmap(new BitmapFactory.decodeFile(f.getAbsolutePath()));

First you passing wrong file path.
for Correct File path do like this
Environment.getExternalStoragePublicDirectory (Environment.DIRECTORY_PICTURES).getAbsolutePath());
then create your URL like.
String filePath = Environment.getExternalStoragePublicDirectory (Environment.DIRECTORY_PICTURES).getAbsolutePath()) + "/cat.jpg";
Then use like this.
File image = new File(filePath);
imageView.setImageBitmap(new BitmapFactory.decodeFile(image.getAbsolutePath()));

Got it working with combination of the 2 posted codes, thanks for everyone, here's the working code:
Environment.getExternalStoragePublicDirectory (Environment.DIRECTORY_PICTURES).getAbsolutePath();
String filePath = Environment.getExternalStoragePublicDirectory (Environment.DIRECTORY_PICTURES) + "/picFolder/1.jpg";
File image = new File(filePath);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
image1.setImageBitmap(bitmap);

save image in a folder on your website without fileupload

i have my website hosted on a server and i have a folder their named images.I am recieving a base64 string and convert it into an image and saving it in my local directory and it works perfectly.
[WebMethod]
public void UploadPics(String imageString)
{
//HttpRequest Request = new HttpRequest();
//HttpPostedFile filePosted = new HttpPostedFile();
string base64String = imageString;
// Convert Base64 String to byte[]
byte[] imageBytes = Convert.FromBase64String(base64String);
MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);
// Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length);
System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
//string newFile = Guid.NewGuid().ToString() + fileExtensionApplication;
string filePath = "C:/Users/MUWebServices/App_Code/images/pic1.jpg";
image.Save(filePath, ImageFormat.Jpeg);
}
But when i use
string filePath = "http://mywebsite.com/images/pic1.jpg";
image.Save(filePath, ImageFormat.Jpeg);
received following exception
"System.ArgumentException: URI formats are not supported" .
How can i save images on website folder. I found some solutions but all were using fileUpload and i can't use that because i am receiving base64 image string from android and using this webservice to save images.

You will have to upload the file. Since you are opening a TCP/IP connection to another computer you need to follow protocol to write that file to that remote directory. Let me explain this to you as Robert A. Heinlein
once said,
Anyone who considers protocol unimportant has never dealt with a cat. -Robert A. Heinlein
Jokes apart you still have to use file upload(you could do this via AsyncTask. A remote computer will most probably not use a uri for the same.

FreeImage problems on Android (NDK)

I tried to use FreeImage library to load PNG as a texture (from memory). That's the fragment of code:
FIMEMORY *fiStream = FreeImage_OpenMemory(streamData, size);
FREE_IMAGE_FORMAT fileFormat = FreeImage_GetFileTypeFromMemory(fiStream, 0);
FIBITMAP *image = FreeImage_LoadFromMemory(fileFormat, fiStream, 0);
int bitsPerPixel = FreeImage_GetBPP(image);
width = (int)FreeImage_GetWidth(image);
height = (int)FreeImage_GetHeight(image);
I'm using FILE with fopen to open file and then read stream to streamData object. File and stream is read correctly.
The result is: fileFormat = -1 and image is NULL.
I also tried to use FreeImage to load PNG file directly from disk using FreeImage_Load, but the result is the same - it returns NULL.
Has anybody faced similar problem? Can you suggest an alternative to FreeImage that can read data from memory?

try this code to load your image from memory:
File file = new File("/sdcard/Images/image1.jpg");
if(file.exists()){
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
ImageView image = (ImageView) findViewById(R.id.imageview);
image.setImageBitmap(bitmap);
}

way to show image from asset and store it in SD card

I am creating one wallpaper application therefore i put some image in asset folder. I need to show this image one by one on button click and store it in sd card.
What i did:
I use ImageView and WebView to show image. First, when i use WebView, i stuck on setting image size because it showing to small and i need to show those image as per device window size.
I use following code but didn't help to adjust image on screen
myWebView.loadUrl("file:///android_asset/image.html");
WebSettings settings = myWebView.getSettings();
settings.setUseWideViewPort(true);
settings.setLoadWithOverviewMode(true);
I also set <src img="someimage.jpg" width=""100%"> but it didn't help me.
Then i use ImageView to show image and able to show image at least in some proper size using following code.
InputStream ims = getAssets().open("31072011234.jpg");
// load image as Drawable
Drawable d = Drawable.createFromStream(ims, null);
// set image to ImageView
imageView.setImageDrawable(d);
My Question is
Which is the good way to show image on screen imageview or webview?. how to take all picture in array when i don't know name of this images and store it in SD card
Give me some hint or reference.
Thanks in advance.

You don't need to put your images in assets folder, you can use res/drawable to store your images and access it as resource.
Using below code you can access images from drawable without need to know the names of image files.
Class resources = R.drawable.class;
Field[] fields = resources.getFields();
String[] imageName = new String[fields.length];
int index = 0;
for( Field field : fields )
{
imageName[index] = field.getName();
index++;
}
int result = getResources().getIdentifier(imageName[10], "drawable", "com.example.name");
and using below code you can save your images to SD card.
File file = new File(extStorageDirectory, "filename.PNG");
outStream = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();

The best way to show an image would be ImageView (That's why it's called an Image View), I recommend that you add the image in res/drawable folder and show the image using:
imageView.setImageResource(R.id.some_image);
The resource can be saved to sdcard using:
Bitmap bm = BitmapFactory.decodeResource( getResources(), R.id.some_image);
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
File file = new File(extStorageDirectory, "someimage.PNG");
outStream = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();