Last active
August 22, 2018 06:27
-
-
Save dineshmm23/406e0201d7e2f18a970c1b0420fdc180 to your computer and use it in GitHub Desktop.
Decrease image size without losing its quality in android.https://stackoverflow.com/questions/28424942/decrease-image-size-without-losing-its-quality-in-android
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
public String compressImage(String imageUri) { | |
String filePath = getRealPathFromURI(imageUri); | |
Bitmap scaledBitmap = null; | |
BitmapFactory.Options options = new BitmapFactory.Options(); | |
// by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If | |
// you try the use the bitmap here, you will get null. | |
options.inJustDecodeBounds = true; | |
Bitmap bmp = BitmapFactory.decodeFile(filePath, options); | |
int actualHeight = options.outHeight; | |
int actualWidth = options.outWidth; | |
// max Height and width values of the compressed image is taken as 816x612 | |
float maxHeight = 816.0f; | |
float maxWidth = 612.0f; | |
float imgRatio = actualWidth / actualHeight; | |
float maxRatio = maxWidth / maxHeight; | |
// width and height values are set maintaining the aspect ratio of the image | |
if (actualHeight > maxHeight || actualWidth > maxWidth) { | |
if (imgRatio < maxRatio) { | |
imgRatio = maxHeight / actualHeight; | |
actualWidth = (int) (imgRatio * actualWidth); | |
actualHeight = (int) maxHeight; | |
} else if (imgRatio > maxRatio) { | |
imgRatio = maxWidth / actualWidth; | |
actualHeight = (int) (imgRatio * actualHeight); | |
actualWidth = (int) maxWidth; | |
} else { | |
actualHeight = (int) maxHeight; | |
actualWidth = (int) maxWidth; | |
} | |
} | |
// setting inSampleSize value allows to load a scaled down version of the original image | |
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight); | |
// inJustDecodeBounds set to false to load the actual bitmap | |
options.inJustDecodeBounds = false; | |
// this options allow android to claim the bitmap memory if it runs low on memory | |
options.inPurgeable = true; | |
options.inInputShareable = true; | |
options.inTempStorage = new byte[16 * 1024]; | |
try { | |
// load the bitmap from its path | |
bmp = BitmapFactory.decodeFile(filePath, options); | |
} catch (OutOfMemoryError exception) { | |
exception.printStackTrace(); | |
} | |
try { | |
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888); | |
} catch (OutOfMemoryError exception) { | |
exception.printStackTrace(); | |
} | |
float ratioX = actualWidth / (float) options.outWidth; | |
float ratioY = actualHeight / (float) options.outHeight; | |
float middleX = actualWidth / 2.0f; | |
float middleY = actualHeight / 2.0f; | |
Matrix scaleMatrix = new Matrix(); | |
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY); | |
Canvas canvas = new Canvas(scaledBitmap); | |
canvas.setMatrix(scaleMatrix); | |
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG)); | |
// check the rotation of the image and display it properly | |
ExifInterface exif; | |
try { | |
exif = new ExifInterface(filePath); | |
int orientation = exif.getAttributeInt( | |
ExifInterface.TAG_ORIENTATION, 0); | |
Log.d("EXIF", "Exif: " + orientation); | |
Matrix matrix = new Matrix(); | |
if (orientation == 6) { | |
matrix.postRotate(90); | |
Log.d("EXIF", "Exif: " + orientation); | |
} else if (orientation == 3) { | |
matrix.postRotate(180); | |
Log.d("EXIF", "Exif: " + orientation); | |
} else if (orientation == 8) { | |
matrix.postRotate(270); | |
Log.d("EXIF", "Exif: " + orientation); | |
} | |
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, | |
scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, | |
true); | |
} catch (IOException e) { | |
e.printStackTrace(); | |
} | |
FileOutputStream out = null; | |
String filename = getFilename(); | |
try { | |
out = new FileOutputStream(filename); | |
// write the compressed bitmap at the destination specified by filename. | |
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out); | |
} catch (FileNotFoundException e) { | |
e.printStackTrace(); | |
} | |
return filename; | |
} | |
public String getFilename() { | |
File file = new File(Environment.getExternalStorageDirectory().getPath(), "MyFolder/Images"); | |
if (!file.exists()) { | |
file.mkdirs(); | |
} | |
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg"); | |
return uriSting; | |
} | |
private String getRealPathFromURI(String contentURI) { | |
Uri contentUri = Uri.parse(contentURI); | |
Cursor cursor = getContentResolver().query(contentUri, null, null, null, null); | |
if (cursor == null) { | |
return contentUri.getPath(); | |
} else { | |
cursor.moveToFirst(); | |
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); | |
return cursor.getString(index); | |
} | |
} | |
public int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { | |
final int height = options.outHeight; | |
final int width = options.outWidth; | |
int inSampleSize = 1; | |
if (height > reqHeight || width > reqWidth) { | |
final int heightRatio = Math.round((float) height / (float) reqHeight); | |
final int widthRatio = Math.round((float) width / (float) reqWidth); | |
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; | |
} | |
final float totalPixels = width * height; | |
final float totalReqPixelsCap = reqWidth * reqHeight * 2; | |
while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) { | |
inSampleSize++; | |
} | |
return inSampleSize; | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Bitmap bitmapImage = BitmapFactory.decodeFile("Your path"); | |
int nh = (int) ( bitmapImage.getHeight() * (512.0 / bitmapImage.getWidth()) ); | |
Bitmap scaled = Bitmap.createScaledBitmap(bitmapImage, 512, nh, true); | |
your_imageview.setImageBitmap(scaled); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment