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问题:
I am using the following code for image compression.
The code compresses image files that are larger than 2 MB.
But this code takes time and image quality stays pure.
public static String compressImage(String imagePath, Context context)
{
String resizeImagePath = null;
String filePath = imagePath;
CustomLogHandler.printDebug(TAG, "resizeImagePath:" + imagePath);
Bitmap scaledBitmap = null;
int imageScal = 1;
// File size greater then 2mb
DecimalFormat df = new DecimalFormat("0.00");
File imgFile = new File(filePath);
double bytes = imgFile.length();
double kilobytes = (bytes / 1024);
double megabytes = (kilobytes / 1024);
AppConfig.makeLog(TAG, "image size in mb:" + df.format(megabytes), 0);
double filesize = Double.parseDouble(df.format(megabytes));
if (filesize > 2.00f)
{
for (int i = 0; i < filesize; i = i + 2)
{
imageScal++;
}
int remind = imageScal / 2;
if (remind != 0)
{
imageScal = imageScal + 1;
}
makeLog(TAG, "image scale:" + imageScal, 0);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
float maxHeight = 4000;
float maxWidth = 6000;
// float imgRatio = actualWidth / actualHeight;
// float maxRatio = maxWidth / maxHeight;
if (actualHeight > maxHeight)
{
imageScal = imageScal + 4;
}
if (actualWidth > maxWidth)
{
imageScal = imageScal + 8;
}
// 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;
//
// }
// }
// options.inSampleSize = utils.calculateInSampleSize(options, actualWidth, actualHeight);
options.inSampleSize = imageScal;
options.inJustDecodeBounds = false;
options.inDither = true;
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try
{
bmp = BitmapFactory.decodeFile(filePath, options);
bmp = decodeFile(filePath);
}
catch (OutOfMemoryError exception)
{
exception.printStackTrace();
}
boolean done = false;
while (!done)
{
try
{
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888);
// scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888);
done = true;
}
catch (OutOfMemoryError exception)
{
// 15923 × 1790
// 5616 × 3744
// 8150 × 9154
actualWidth = actualWidth - ((actualWidth * 2) / 100);
actualHeight = actualHeight - ((actualHeight * 2) / 100);
// scaledBitmap = Bitmap.createBitmap(5616, 3744, Bitmap.Config.ARGB_8888);
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));
// Resize image stored in sdcard
FileOutputStream out = null;
// filename =AppConfig.fileTosaveMedia(context, FileType.IMAGE, true).getAbsolutePath();
int compress = 50;
try
{
do
{
imgFile = AppConfig.fileTosaveMedia(context, FileType.IMAGE, true);
out = new FileOutputStream(imgFile);
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, compress, out);
resizeImagePath = imgFile.getAbsolutePath();
// Thread.sleep(15000);
// imgFile = new File(filename);
bytes = imgFile.length();
kilobytes = (bytes / 1024);
megabytes = (kilobytes / 1024);
System.out.println("resized image size in mb:" + df.format(megabytes));
filesize = Double.parseDouble(df.format(megabytes));
if (filesize > 2.00f)
{
compress = 30;
}
} while (filesize > 2.00f);
scaledBitmap.recycle();
}
catch (Exception e)
{
e.printStackTrace();
}
}
else
{
FileOutputStream out = null;
// FileInputStream in = null;
imgFile = AppConfig.fileTosaveMedia(context, FileType.IMAGE, true);
resizeImagePath = imgFile.getAbsolutePath();
InputStream in = null;
OutputStream outTemp = null;
try
{
// create output directory if it doesn't exist
in = new FileInputStream(filePath);
outTemp = new FileOutputStream(resizeImagePath);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1)
{
outTemp.write(buffer, 0, read);
}
in.close();
in = null;
// write the output file (You have now copied the file)
outTemp.flush();
outTemp.close();
outTemp = null;
}
catch (FileNotFoundException fnfe1)
{
Log.e("tag", fnfe1.getMessage());
}
catch (Exception e)
{
Log.e("tag", e.getMessage());
}
// try
// {
// Bitmap bmp = decodeFile(filePath);
// // in = new FileInputStream(new File(imagePath));
// // persistImage(bitmap, name);
// out = new FileOutputStream(resizeImagePath);
// bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
// out.flush();
// out.close();
// // FileIO.copyStream(in, out);
// }
// catch (Exception e)
// {
// e.printStackTrace();
// }
}
CustomLogHandler.printDebug(TAG, "resizeImagePath:" + resizeImagePath);
return resizeImagePath;
}
I spent so much time on Google search and reading blogs. Then after creating the above code, I found this.
Is the above code correct? Or is there any other library to use to compress images?
Please help me.
回答1:
Try below code :-
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;
}
for for information see below link :-
http://voidcanvas.com/whatsapp-like-image-compression-in-android/
回答2:
Hope Helps this
public static String compressImage(String filePath) {
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
float maxHeight = 400.0f;
float maxWidth = 300.0f;
float imgRatio = actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
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;
}
}
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 static String getFilename() {
File file = new File(Environment.getExternalStorageDirectory().getPath(), "Foldername/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
return uriSting;
}
public static 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;
}
public static Bitmap highlightImage(Bitmap src) {
// create new bitmap, which will be painted and becomes result image
Bitmap bmOut = Bitmap.createBitmap(src.getWidth() + 96, src.getHeight() + 96, Bitmap.Config.ARGB_8888);
// setup canvas for painting
Canvas canvas = new Canvas(bmOut);
// setup default color
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
// create a blur paint for capturing alpha
Paint ptBlur = new Paint();
ptBlur.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL));
int[] offsetXY = new int[2];
// capture alpha into a bitmap
Bitmap bmAlpha = src.extractAlpha(ptBlur, offsetXY);
// create a color paint
Paint ptAlphaColor = new Paint();
ptAlphaColor.setColor(0xFFFFFFFF);
// paint color for captured alpha region (bitmap)
canvas.drawBitmap(bmAlpha, offsetXY[0], offsetXY[1], ptAlphaColor);
// free memory
bmAlpha.recycle();
// paint the image source
canvas.drawBitmap(src, 0, 0, null);
// return out final image
return bmOut;
}
回答3:
Try this code
private void previewCapturedImage() {
try {
int targetW = 450;
int targetH = 450;
Log.e("Get w", "width" + targetW);
Log.e("Get H", "height" + targetH);
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filename, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW / targetW, photoH / targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor << 1;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(filename, bmOptions);
Matrix mtx = new Matrix();
try {
File imageFile = new File(filename);
imageFile1 = imageFile;
ExifInterface exif = new ExifInterface(
imageFile.getAbsolutePath());
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
Log.e("Orintation", " :-" + orientation);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
mtx.postRotate(270);
rotatedBMP = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), mtx, true);
if (rotatedBMP != bitmap)
bitmap.recycle();
imgPreview.setImageBitmap(rotatedBMP);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
mtx.postRotate(180);
rotatedBMP = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), mtx, true);
if (rotatedBMP != bitmap)
bitmap.recycle();
imgPreview.setImageBitmap(rotatedBMP);
break;
case ExifInterface.ORIENTATION_ROTATE_90:
mtx.postRotate(90);
rotatedBMP = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), mtx, true);
if (rotatedBMP != bitmap)
bitmap.recycle();
imgPreview.setImageBitmap(rotatedBMP);
break;
case ExifInterface.ORIENTATION_NORMAL:
mtx.postRotate(0);
rotatedBMP = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), mtx, true);
if (rotatedBMP != bitmap)
bitmap.recycle();
imgPreview.setImageBitmap(rotatedBMP);
break;
default:
mtx.postRotate(0);
rotatedBMP = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), mtx, true);
if (rotatedBMP != bitmap)
bitmap.recycle();
imgPreview.setImageBitmap(rotatedBMP);
// img_profilepic.setImageBitmap(BitmapFactory
// .decodeFile(mCurrentPhotoPath));
}
double megabytes = 0;
if (imageFile1.exists()) {
double bytes = imageFile1.length();
double kilobytes = (bytes / 1024);
megabytes = (kilobytes / 1024);
double gigabytes = (megabytes / 1024);
double terabytes = (gigabytes / 1024);
double petabytes = (terabytes / 1024);
double exabytes = (petabytes / 1024);
double zettabytes = (exabytes / 1024);
double yottabytes = (zettabytes / 1024);
Log.e("Image Size After in KB", "20th May:" + kilobytes);
Log.e("Image Size After in MB", "20th May:" + megabytes);
}
int AfterSize = rotatedBMP.getRowBytes()
* rotatedBMP.getHeight();
Log.e("After Compress Withd ",
"21st May ::" + rotatedBMP.getWidth());
Log.e("After Compress Withd ",
"21st May ::" + rotatedBMP.getWidth());
Log.i("RotateImage", "Exif orientation: " + orientation);
tv_After.setText("After Width:" + rotatedBMP.getWidth()
+ " :Height:" + rotatedBMP.getHeight() + ":in MB :"
+ megabytes + " :Bitmap: " + AfterSize);
} catch (Exception e) {
e.printStackTrace();
}
} catch (NullPointerException e) {
e.printStackTrace();
}
}
also put this method.
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++;
}
Log.e("In Sample Size..", "19th May :-" + inSampleSize);
return inSampleSize;
}
回答4:
I have used the Top answer...
The mentioned method is not working, it returning empty path in some Xiaomi phones because there is some problem with getting file path from Uri.
use the getFilePath() instead of getRealPathFromURI()... and change parameters from compressImage(String imageUri) to compressImage(Uri imageUri).
private static String getFilePath(Context context, Uri uri) {
String selection = null;
String[] selectionArgs = null;
// Uri is different in versions after KITKAT (Android 4.4), we need to
if (Build.VERSION.SDK_INT >= 19 && DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) {
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
return Environment.getExternalStorageDirectory() + "/" + split[1];
} else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
uri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
} else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("image".equals(type)) {
uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
selection = "_id=?";
selectionArgs = new String[]{
split[1]
};
}
}
if ("content".equalsIgnoreCase(uri.getScheme())) {
String[] projection = {
MediaStore.Images.Media.DATA
};
Cursor cursor = null;
try {
cursor = context.getContentResolver()
.query(uri, projection, selection, selectionArgs, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
if (cursor.moveToFirst()) {
return cursor.getString(column_index);
}
} catch (Exception e) {
}
} else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
private static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
private static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
private static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
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