Android - how to compress or downsize an image?
Solution 1
You can mess with the ImageButton's scaleType properties (to fitXY for example, or cropCenter), and by setting a fixed size to LayoutPreferences (height and width) you'll be all set.
Solution 2
Bitmap thumb = Bitmap.createScaledBitmap (BitmapFactory.decodeFile(photoPath), 96, 96, false);
Where the second and third parameters to createScaledBitmap are the width and height respectively.
EDIT: It now occurred to me that you can do this in a faster, more efficient way, using BitmapFactory.Options
and the inSampleSize
option:
BitmapFactory.Options opts = new BitmapFactory.Options ();
opts.inSampleSize = 2; // for 1/2 the image to be loaded
Bitmap thumb = Bitmap.createScaledBitmap (BitmapFactory.decodeFile(photoPath, opts), 96, 96, false);
This way you will save even more memory and the downsizing should take less time.
Comments
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Beginner almost 2 years
ImageButton avatarButton = (ImageButton) findViewById(R.id.ImageButton_Avatar); avatarButton.setImageResource(R.drawable.avatar); strAvatarFilename = "Image.jpg"; final Uri imageUriToSaveCameraImageTo = Uri.fromFile(new File(Environment.getExternalStorageDirectory()+"/Folder/"+strAvatarFilename)); avatarButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent pictureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); pictureIntent.putExtra( MediaStore.EXTRA_OUTPUT, imageUriToSaveCameraImageTo ); startActivityForResult(Intent.createChooser(pictureIntent, strAvatarPrompt), TAKE_AVATAR_CAMERA_REQUEST); Editor editor = Preferences.edit(); editor.putString(PREFERENCES_AVATAR, imageUriToSaveCameraImageTo.getPath()); editor.commit(); } });
I have this code. It takes a photo and then stores it in two locations, the default location on the SDcard and the /folder/ file i want the photo to be stored in also. Once taken i refresh the screen using this...
ImageButton avatarButton = (ImageButton) findViewById(R.id.ImageButton_Avatar); String strAvatarUri = Preferences.getString(PREFERENCES_AVATAR, ""); Uri imageUri = Uri.parse(strAvatarUri); avatarButton.setImageURI(null); avatarButton.setImageURI(imageUri);
This refreshes the image button so the user can see the image they have taken. However, this is appears very big and fills the screen. Is there any way i can compress or downsize the image so the user can see it at a reasonable size? thanks
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Shade over 13 yearsBut that way you will have the full bitmap loaded in memory. If you do it in the way I have suggested, you load the full bitmap, create the scaled-down version and later, the loaded full bitmap gets garbage-collected.
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Shirish Herwade over 11 years@Shade please tell how to "create the scaled-down version"
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Shade over 11 years@Why and How, see my answer below.