Develop Reference

SetImageUri showing no Image

I want to let a image on my phone to show up in the Imageview. But in the ANdroid Studio emulator it is working but not on my own phone.
String imgPath = getIntent().getExtras().getString("imgPath");
System.out.println(imgPath);
if(!imgPath.equals("?"))
{
File img_file = new File(imgPath);
ImageView imgView = findViewById(R.id.show_image_war);
imgView.setImageURI(Uri.fromFile(img_file));
}
The path is /storage/emulated/0/imagesWarranty/img_MyWarranty_ID1.jpg . Both on the image in my phone and the path in my code where I get the image.

It might be issue of resolution. Even I was getting error of resolution while I was displaying image from uri.
I used below code and It worked for me :
Uri imageUri = Uri.parse(imagePath);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(new File(imageUri.getPath()).getAbsolutePath(), options);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;
if (imageHeight > 4096 || imageWidth > 4096) {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = 4;
Bitmap bitmap = BitmapFactory.decodeFile(imageUri.toString(), opts);
viewHolder.imgAvatarLogoList3.setImageBitmap(bitmap);
} else {
Picasso.with(context)
.load(new File(imageUri.getPath())) // Uri of the picture
.into(viewHolder.imgAvatarLogoList3);
}

Addition to this answer [https://stackoverflow.com/a/48354307/9255006]
In that rotation bug define the image orientation for the image using ExifInterface.
Here is the code
private void SetOrientation(){
try {
ExifInterface exif=new ExifInterface(photoURI.getPath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,ExifInterface.ORIENTATION_UNDEFINED);
if (orientation == ExifInterface.ORIENTATION_ROTATE_90) { orientationInDegrees=90; }
else if (orientation == ExifInterface.ORIENTATION_ROTATE_180) { orientationInDegrees=180; }
else if (orientation == ExifInterface.ORIENTATION_ROTATE_270) { orientationInDegrees=270; }
else { orientationInDegrees=0; }
Toast.makeText(this, String.valueOf(orientationInDegrees), Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
You can then set this orientation to your image.

This happens when the image has a very high resolution that the system needs some additional milliseconds to display, and since this happens in the UI thread onDraw() of the image view will draw it as an empty.
The easiest way I found for this issue is to use the Picasso library this way:
Picasso.get().load(imgUri).fit().centerCrop()
.into(imageview);
The reason behind those two methods (fit(), centerCrop())
Is that fit make sure that the image fit the bound container and then crop the image which force the system to redraw the image but this time with the convenient resolution (because of fit and crop).

Image losing quality and size in android?

I have an app which takes photos of receipts and upload it to a remote server.
I get the full-sized photo of the image from the camera intent correctly.I followed this using the official documentation in Google developer.
I then set my picture like this.
private void setPic() {
// Get the dimensions of the View
int targetW = imageView.getWidth();
int targetH = imageView.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
//Bitmap bitmap = null;
//try
//{
//bitmap = MediaStore.Images.Media.getBitmap(getContentResolver() , //Uri.parse(mCurrentPhotoPath));
//}
//catch (Exception e)
//{
//handle exception
//}
imageView.setImageBitmap(bitmap);
new ImageSaver(getApplicationContext()).
setFileName("currentImage.png").
setDirectoryName("Android_Upload").
save(bitmap);
Model.currentImage = "currentImage.png";
}
This works fine when viewed on the device. But after its sent to the server and viewed from there, the image size is too small.
ImageSaver class pretty much saves the image elsewhere and compresses it but with 100 quality in png.I do this, so I can later the image in the database as Blob(again with 100 quality)
How can I decode the image and show the image in the image view but without losing quality (and the size?)

Apparently, you have scaled down your image while decoding.
You may want to remove the following line:
bmOptions.inSampleSize = scaleFactor;

Get Bitmap from ImageView in Android L

I want to get Bitmap from ImageView. I have used following code, but getDrawable() returns null. How to get whole Bitmap from ImageView.
Bitmap bitmap;
if (mImageViewer.getDrawable() instanceof BitmapDrawable) {
bitmap = ((BitmapDrawable) mImageViewer.getDrawable()).getBitmap();
} else {
Drawable d = mImageViewer.getDrawable();
bitmap = Bitmap.createBitmap(d.getIntrinsicWidth(), d.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
d.draw(canvas);
}
storeImage(bitmap,"final.jpeg");

If you just want the Bitmap from a ImageView the following code may work for you:-
Bitmap bm=((BitmapDrawable)imageView.getDrawable()).getBitmap();
Try having the image in all drawable qualities folders (drawable-hdpi/drawable-ldpi etc.)
Could be that the emulator or device your using has a different density and is trying to pull images from another folder.
If you are using an extension in your image other than .png, .jpg, or .gif, It might not recognize other extension types. http://developer.android.com/guide/topics/resources/drawable-resource.html

According to this answer, just do it like this:
imageView.buildDrawingCache();
Bitmap bmap = imageView.getDrawingCache();

For Kotlin:
simply write this code to get the bitmap from an ImageView
imageview.invalidate()
val drawable = imageview.drawable
val bitmap = drawable.toBitmap()

If you are trying to get bitmap from Glide loaded image then this will help you
Drawable dr = ((ImageView) imView).getDrawable();
Bitmap bmp = ((GlideBitmapDrawable)dr.getCurrent()).getBitmap();

Take a picture of the ImagView and convert it to a string to send to the server
ImageView ivImage1 = (ImageView ) findViewById(R.id.img_add1_send );
getStringImage( ( ( BitmapDrawable ) ivImage1.getDrawable( ) ).getBitmap( ) ),
public String getStringImage(Bitmap bm){
ByteArrayOutputStream ba=new ByteArrayOutputStream( );
bm.compress( Bitmap.CompressFormat.PNG,90,ba );
byte[] by=ba.toByteArray();
String encod= Base64.encodeToString( by,Base64.DEFAULT );
return encod;
}

Convert a File Object to Bitmap

I am using Universal-Image-Loader and there is this functionality that access the file cache of the image from sd card. But I don't know how to convert the returned file cache into bitmap. Basically I just wanted to assign the bitmap to an ImageView.
File mSaveBit = imageLoader.getDiscCache().get(easyPuzzle);
Log.d("#ImageValue: ", ""+mSaveBit.toString());
mImageView.setImageBitmap(mSaveBit);
Error: "The method setImageBitmap(Bitmap) in the type ImageView is not applicable for the arguments (File)"

You should be able to use BitmapFactory:
File mSaveBit; // Your image file
String filePath = mSaveBit.getPath();
Bitmap bitmap = BitmapFactory.decodeFile(filePath);
mImageView.setImageBitmap(bitmap);

Define File
String fileName = "/myImage.jpg";
File file = new File(fileName);
get Bitmap of Image
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
Set Bitmap to ImageView
myImageView.setImageBitmap(bitmap);

You can use this function to get Bitmap from file path
fun getBitmap(filePath:String):Bitmap?{
var bitmap:Bitmap?=null
try{
var f:File = File(path)
var options = BitmapFactory.Options()
options.inPreferredConfig = Bitmap.Config.ARGB_8888
bitmap = BitmapFactory.decodeStream(FileInputStream(f),null,options)
}catch (e:Exception){
}
return bitmap
}

Here is a simple code to create a scaled image for ImageView in this case
- Width:400
- Height:400
final File file = new File(Environment.getExternalStorageDirectory(),"b.jpg");
ImageView img = (ImageView) findViewById(R.id.imageview);
img.setImageBitmap(Bitmap.createScaledBitmap(BitmapFactory.decodeFile(file.getAbsolutePath()),400,400,false));

Kotlin Version
if (requestCode==PICK_IMAGE_REQUEST){
if (data!=null){
selectedfileUri=data.data
if (selectedfileUri!=null && !selectedfileUri!!.path.isEmpty()){
val file = FileUtils.getFile(context,selectedfileUri)
val bitmap = BitmapFactory.decodeFile(file.path)
uimg!!.setImageBitmap(bitmap)
}
}
}

This is not the right question, but if you use flag .cacheInMemory() in ImageLoader setup you can retrive the bitmap without need of recreate at any time using BitmapFactory to safe memory usage .
Just use:
Bitmap bitmap = ImageLoader.getInstance().getMemoryCache()·get("url as key");

Image isn't creating using the BitmapFactory.decodeByteArray

Edit:
When I save those bytes in the txt file and when I save it as png file , it shows the image, but it is not working here why...?
I am using this code to create image from byte array
on doInBackground()
String base64data=StringEscapeUtils.unescapeJava(IOUtils.toString(resp.getEntity().getContent()));
base64data=base64data.substring(1,base64data.length()-1);
JSONObject obj=new JSONObject(base64data);
JSONArray array=obj.getJSONArray("EMRTable");
JSONObject childobj=array.getJSONObject(0);
results=childobj.getString("DocumentInternalFormat");
and onPostExecute
if(jsondata!=null) {
receiveData(jsondata);
}
There is no error in the logcat, even there is no exception in it..but the image isn't showing. I have also did like this
String data=(String)object;
data=data.trim();
byte[] base64converted=Base64.decode(data,Base64.DEFAULT);
ImageView image=new ImageView(context);
image.setImageBitmap(bmp);
setContentView(image);
but the result same image isn't showing but there is no exception or an error, what is the problem...
The commented lines are when I try to store those bytes into text file and when I pull the file, it shows the images with windows default image viewer.

Try this code while getting bitmap from different resources...
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(base64converted,0,base64converted.length,options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, 500, 500);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap bmp1=BitmapFactory.decodeByteArray(base64converted,0,base64converted.length,options);
follow the tutorial on this link Efficient way to show bitmaps

remove the below line from your code and try again
base64data=base64data.substring(1,base64data.length()-1);