Convert a File Object to Bitmap

Question

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)"

Answer 1

You should be able to use BitmapFactory:

File mSaveBit; // Your image file
String filePath = mSaveBit.getPath();  
Bitmap bitmap = BitmapFactory.decodeFile(filePath);
mImageView.setImageBitmap(bitmap);

Answer 2

1. Define File

   String fileName = "/myImage.jpg";
   File file = new File(fileName); 
   

2. get Bitmap of Image

   Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
   

3. Set Bitmap to ImageView

   myImageView.setImageBitmap(bitmap);
   

Answer 3

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));

Answer 4

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)
                }
            }
        }

Answer 5

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");

Answer 6

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
}