Develop Reference

Bitmap image file to int

I have some problem with my code..
I want to set value luckywheelitem library from https://github.com/thanhniencung/LuckyWheel ,
I have image file from gallery then convert to bitmap
String root = Environment.getExternalStorageDirectory().toString() + "/Luckywheel";
Bitmap bitmap = BitmapFactory.decodeFile(root+ "/sarada.png" );
Then i want set value luckyItem1.icon = ; but just receive integer value
how to convert from image bitmap to int (drawable)
Thank you for attention

You should pass to luckyItem1.icon only a resource file. You should add drawable to your project and then use it.
Example:
luckyItem1.icon = R.drawable.luckyItemIcon

How to add small bitmap in front of large bitmap image

we need to merge two images with background large image and in front of that a small bitmap and I am using this code then the result is like this what is wrong and how to solve this problem. here the image of the small image is not visible but in small image place a large image is placed
**
Java code
**
Bitmap backgroundimage = BitmapFactory.decodeResource(getApplicationContext().getResources(),
R.drawable.rec_);
BitmapDrawable mBitmapDrawable= new BitmapDrawable( overlay(bitmap,backgroundimage));
mBitmapDrawable.setGravity(CENTER);
toolbar_layout.setBackground(mBitmapDrawable);
private Bitmap overlay(Bitmap bmp1, Bitmap bmp2) {
Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig());
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(bmp1, new Matrix(), null);
canvas.drawBitmap(bmp2, new Matrix(), null);
return bmOverlay;
}

Convert OpenCV mat to Android Bitmap

I am trying to convert an OpenCV mat to android Bitmap but that gives me images with a bluish tint(yellow colour turns to blue)! Even though I am not doing any processing on the image! I have no clue why this is happening. Below is some relevant code:
File file = new File(imgDecodableString);
image = Imgcodecs.imread(file.getAbsolutePath(),Imgcodecs.CV_LOAD_IMAGE_COLOR);
resultBitmap = Bitmap.createBitmap(image.cols(), image.rows(),Bitmap.Config.ARGB_8888);;
Utils.matToBitmap(image, resultBitmap);
Bitmap mResult = resultBitmap;
ImageView imgView = (ImageView) findViewById(R.id.imgView);
imgView.setImageBitmap(mResult);
//imgView.setImageBitmap(BitmapFactory.decodeFile(imgDecodableString));
I am new to android app development so I might be missing something simple. Thanks for help!
EDIT:
I am uploading images for reference.

Based on the given suggestions, I made a function which converts Mat to Bitmap. This function works perfectly.!
private static Bitmap convertMatToBitMap(Mat input){
Bitmap bmp = null;
Mat rgb = new Mat();
Imgproc.cvtColor(input, rgb, Imgproc.COLOR_BGR2RGB);
try {
bmp = Bitmap.createBitmap(rgb.cols(), rgb.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(rgb, bmp);
}
catch (CvException e){
Log.d("Exception",e.getMessage());
}
return bmp;
}

As suspected, the issue is with the RGB color convention, Android follows RGB color convention, but OpenCV follows BGR color convention, You can rectify it using Imgproc.cvtColor(mat, Imgproc.COLOR_BGR2RGBA), before displaying it in the ImageView.

Is possible convert BitmapDescriptor to Bitmap?

I need to convert BitmapDescriptor to Bitmap.
I can convert a bitmap to BitmapDescriptor with this code:
BitmapDescriptor bd = BitmapDescriptorFactory.fromBitmap(bitmap);
but how can i do the inverse way ?
I need to get BitmapDescriptorFactory.defaultMarker() in bitmap format.

I m not sure but I don't think so it is possible
In my application i have requirement to change default market color ...i got the default marker as bitmap using below code hope it helps u
Drawable d = DrawableUtils.resizeImageToDrawable(
MapViewFragment.mapViewActivity,
Configuration.Display.getDrawableFix(i),
Configuration.MapView.getWaypointIconWidth(),
Configuration.MapView.getWaypointIconHeight());
d.setColorFilter(color, Mode.MULTIPLY);
Bitmap b = ((BitmapDrawable) d).getBitmap();
Canvas myCanvas = new Canvas(b);
int myColor = b.getPixel(0,0);
ColorFilter filter = new LightingColorFilter(myColor, color);
If any questions u can ask

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");