Develop Reference

Android canvas doesn't draw the text on my bitmap

I'm trying to get the text input from the user and draw it on the image using Canvas but the image is saved without what was supposed to be drawn. Right now, I'm just trying to get the text on the Image before I worry about the font, colour, styles, etc.
This is my code:
public void createBitmapAndSave(ImageView img){
BitmapDrawable bitmapDrawable = ((BitmapDrawable) img.getDrawable());
Bitmap bitmap = bitmapDrawable.getBitmap();
Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(mutableBitmap);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
paint.setTextSize(200);
paint.setStyle(Paint.Style.FILL);
paint.setShadowLayer(10f, 10f, 10f, Color.BLACK);
String topText = topTextView.getText().toString();
String bottomText = bottomTextView.getText().toString();
canvas.drawText(topText, 0, 0, paint);
canvas.drawText(bottomText, 50, 50, paint);
File file;
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath();
file = new File(path + "/SimpliMeme/" + timeStamp + "-" + counter + ".jpg");
file.getParentFile().mkdir();
try{
OutputStream stream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG,100,stream);
stream.flush();
stream.close();
Toast.makeText(getContext(), "Meme Saved", Toast.LENGTH_SHORT).show();
}
catch (IOException e){ e.printStackTrace();}
Uri contentUri = Uri.fromFile(file);
mediaScanIntent.setData(contentUri);
Objects.requireNonNull(getContext()).sendBroadcast(mediaScanIntent);
counter++;
}
At the moment, I only have the 2 .drawText() implementations based on the examples that I've seen in other SO posts. My assumption is that the text isn't visible and no changes are made to the image because I haven't provided the paint object with any attributes.

The main issue why you see no changes is that you make changes to mutableBitmap but save the original bitmap to disk.
This can be avoided by joining the first two (or even three) statements together:
final Bitmap bitmap = bitmapDrawable.getBitmap()
.copy(Bitmap.Config.ARGB_8888, true);
You didn't need the orginal bitmap anywhere else, this effectively prevents you from making the mistake. Don't do what you don't need to do.
Some tips:
Always be explicit when drawing. Specify the color, specify the font. You can't trust default values. (At least I'm never sure about the values. Is the default color black or transparent?)
If you want to be asolutely sure about the font, bundle it with your app or use downloadable fonts. Some platforms allow the user to change the default font to something crazy.
If you ever want to draw multiline text look into StaticLayout.
Make sure your app works on Android 7 and above. Sending intents with file Uri outside your app is prohibited.

Camera Intent Image Preview Orientation

I take an image in Android using the following Code:
File image = new File(this.images_object_dir, loadedObjekt.getFilename());
Uri uri = FileProvider.getUriForFile(this, FILE_PROVIDER, image);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent, CAMERA_ACTIVITY_CODE);
In the camera intent, the image preview is always in portrait mode on my Huawei P20 Pro. On another test-device the preview image (the one where you can decide if you wanna retake the image) is stuck in the "inital" rotation as well which looks ugly. For instance, if you want to take an image in landscape mode, the preview gets flipped to portrait mode.
Is there a solution for this?

There are ~2 billion Android devices, spread across ~20,000 device models. There are dozens, if not hundreds, of pre-installed camera apps across those device models. There are plenty of other camera apps that the user can download and install.
Your code might start any of them.
In the camera intent, the image preview is always in portrait mode on my Huawei P20 Pro
That is the behavior of that one camera app out of hundreds.
On another test-device the preview image (the one where you can decide if you wanna retake the image) is stuck in the "inital" rotation as well which looks ugly.
That is the behavior of that one camera app out of hundreds.
There is no requirement for a camera app to behave that way. Of course, there is no requirement for a camera app to have preview images at all.
Is there a solution for this?
If you wish to use ACTION_IMAGE_CAPTURE, no. The behavior of those hundreds of camera apps is up to the developers of those camera apps, not you.
There are other options for taking pictures, such as using the camera APIs directly or using third-party libraries like Fotoapparat or CameraKit-Android.

Use ExifInterface to check the orientation of the image while decoding it. Then you rotate the image to get required image in proper orientation.
BitmapFactory.Options options = new BitmapFactory.Options();
options.inMutable = true;
Bitmap decoded = BitmapFactory.decodeFile(filePath, options);
if (decoded == null) return null;
try {
ExifInterface exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
int rotation = 0;
if (orientation == ExifInterface.ORIENTATION_ROTATE_90) {
rotation = 90;
} else if (orientation == ExifInterface.ORIENTATION_ROTATE_270) {
rotation = 270;
} else if (orientation == ExifInterface.ORIENTATION_ROTATE_180) {
rotation = 180;
}
if (rotation != 0) {
Matrix matrix = new Matrix();
matrix.postRotate(rotation);
Bitmap newBitmap = Bitmap.createBitmap(decoded, 0, 0, decoded.getWidth(),
decoded.getHeight(), matrix, true);
decoded.recycle();
Runtime.getRuntime().gc();
decoded = newBitmap;
}
} catch (IOException e) {
e.printStackTrace();
}
If you want to use support library in order to support devices with lower API levels, use the following dependency:
implementation 'com.android.support:exifinterface:27.1.1'
and import android.support.media.ExifInterface

How to set imageview from Image Arraylist?

I am using this library but they did not explain all details like other libraries on the github.
in onCreate
ImagePicker.create(this)
.folderMode(true) // folder mode (false by default)
.folderTitle("Folder") // folder selection title
.imageTitle("Tap to select") // image selection title
.single() // single mode
// multi mode (default mode)
.limit(10) // max images can be selected (99 by default)
.showCamera(true) // show camera or not (true by default)
.imageDirectory("Camera") // directory name for captured image ("Camera" folder by default)
// original selected images, used in multi mode
.start(12); // start image picker activity with request code
It is working I can see gallery.
onActivityResult:
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
ImageView imageview = (ImageView)findViewById(R.id.iv1);
if (requestCode == 12 && resultCode == RESULT_OK && data != null) {
ArrayList<Image> images = data.getParcelableArrayListExtra(ImagePickerActivity.INTENT_EXTRA_SELECTED_IMAGES);
// do your logic ....
imageview.setImageBitmap(images);//It is not working, I know it is not bitmap but how to set?
}
}
Finally how to set imageview ?

You can't set an image view to an arraylist of images, you can only set an image view to have one image as a source.
Also, looks like you are processing your images on the main thread, which is also not a good idea.
your images are in the Array, but you have to use them on multiple image views or a custom view that displays multiple images

private Bitmap getScreenshot(Image image) {
Image.Plane[] planes = image.getPlanes();
ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * mWidth;
// ??????Bitmap???
Bitmap bitmap = Bitmap.createBitmap(mWidth + rowPadding / pixelStride, mHeight, Bitmap.Config.RGB_565);
bitmap.copyPixelsFromBuffer(buffer);
image.close();
return bitmap;
}
Image is resource rather than a image but you can use above API to get bitmap by using ByteBuffer. Pass images.get(position) in getScreenshot(Image image). it'll return bitmap then simply set imageView.setImageBitmap(bitmap)
Example link

Image from ACTION_IMAGE_CAPTURE Rotated

I am trying to simply get an image from a phone's camera. Surprisingly, it returns rotated. I've scoured the internet for fixes and came across many solutions using ExifInterface, but it only works sometimes. It gets the orientation wrong seemingly randomly, as I merely recompile and see different results. I have found some people saying this is a fault of the class itself being bugged.
I found other solutions that require like two additional libraries and more java files to do the job, but that just seems ridiculous (and I am avoiding additional packages). How come images are rotated in the first place (in storage they are perfectly fine), and how hard can it possibly be to fix the issue? Also - rotating the Image View also works (and seems much easier than literally creating a rotated image), but I need to know by how much to rotate the view.
EDIT---- I realized that the image is consistently rotated 270 degrees clockwise from the orientation the image was taken in (inside the intent) if the back camera was used, and 90 degrees if the front camera was used. Thus I only really need a way to find out this orientation.
Intent called here:
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = setUpPhotoFile();
mCurrentPhotoPath = photoFile.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
} catch (IOException ex) {
// Error occurred while creating the File
photoFile = null;
mCurrentPhotoPath = null;
}
// Continue only if the File was successfully created
if (photoFile != null) {
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
} else {
Toast noStorage = Toast.makeText(this, "Cannot access mounted storage.", Toast.LENGTH_SHORT);
noStorage.show();
}
}
}
Bitmap created here:
private void setPic() {
/* Get the size of the ImageView */
int targetW = mImageView.getWidth();
int targetH = mImageView.getHeight();
/* Get the size of the image */
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
/* Figure out which way needs to be reduced less */
int scale = 1;
if (photoH > targetH|| photoW > targetW) {
scale = Math.max(
(int)Math.pow(2, (int) Math.ceil(Math.log(targetW /
(double) photoW)) / Math.log(0.5)),
(int)Math.pow(2, (int) Math.ceil(Math.log(targetH /
(double) photoH)) / Math.log(0.5)));
;
}
/* Set bitmap options to scale the image decode target */
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scale;
/* Decode the JPEG file into a Bitmap */
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
/*-----------How should I rotate bitmap/mImageView to correct orientation?*/
/* Associate the Bitmap to the ImageView */
mImageView.setImageBitmap(bitmap);
mImageView.setVisibility(View.VISIBLE);
}

The best solution I have found is this one:
https://www.samieltamawy.com/how-to-fix-the-camera-intent-rotated-image-in-android/
I post the link because I don't want all the credit.
Sami Eltamawy has written a function that rotate the image if its need to be rotated.
I try the code and is working on my devices that the image got rotated.

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;
}