Android 位图大小调整和压缩优化
我得到了一段代码，如果位图的宽度太宽，我会压缩并调整它的大小。 代码可以工作，但我知道位图、调整大小和压缩是昂贵的任务，我担心我的代码在性能方面可能做得不对 你能看一下并提交更好的方法来实现它吗 谢谢 安迪 代码如下：Android 位图大小调整和压缩优化,android,optimization,android-bitmap,Android,Optimization,Android Bitmap,我得到了一段代码，如果位图的宽度太宽，我会压缩并调整它的大小。 代码可以工作，但我知道位图、调整大小和压缩是昂贵的任务，我担心我的代码在性能方面可能做得不对 你能看一下并提交更好的方法来实现它吗 谢谢 安迪 代码如下： // Max Width size final int destWidth = 2300; // Compress the Image ByteArrayOutputStream bytes = new ByteArrayOu
// Max Width size
final int destWidth = 2300;
// Compress the Image
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
Bitmap bitmap = null;
Bitmap resizedBitmap = null;
String path = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), imageUri);
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, bytes);
path = MediaStore.Images.Media.insertImage(getActivity().getContentResolver(), bitmap, imageUri.getEncodedQuery(), null);
} catch (IOException e) {
e.printStackTrace();
}
if (bitmap != null) {
if (bitmap.getWidth() > destWidth) {
final int desHeight = bitmap.getHeight() / (bitmap.getWidth() / destWidth);
resizedBitmap = Bitmap.createScaledBitmap(bitmap, destWidth, desHeight,false);
resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 20, bytes);
path = MediaStore.Images.Media.insertImage(getActivity().getContentResolver(), resizedBitmap, imageUri.getEncodedQuery(), null);
}
}
final Uri uri = Uri.parse(path);
// Clean up
try {
bitmap.recycle();
bytes.close();
if (resizedBitmap != null) {
resizedBitmap.recycle();
}
} catch (IOException e) {
e.printStackTrace();
}
您可以使用以下java类。这是完全优化的 记住在项目中导入
编译'io.reactivex:rxandroid:1.2.1'import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Created by aupadhyay on 1/31/17.
*/
public class FileUtil {
static final String FILES_PATH = "CompressImage";
private static final int EOF = -1;
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
private FileUtil() {
}
public static File from(Context context, Uri uri) throws IOException {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
String fileName = getFileName(context, uri);
String[] splitName = splitFileName(fileName);
File tempFile = File.createTempFile(splitName[0], splitName[1]);
tempFile = rename(tempFile, fileName);
tempFile.deleteOnExit();
FileOutputStream out = null;
try {
out = new FileOutputStream(tempFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (inputStream != null) {
copy(inputStream, out);
inputStream.close();
}
if (out != null) {
out.close();
}
return tempFile;
}
static String[] splitFileName(String fileName) {
String name = fileName;
String extension = "";
int i = fileName.lastIndexOf(".");
if (i != -1) {
name = fileName.substring(0, i);
extension = fileName.substring(i);
}
return new String[]{name, extension};
}
static String getFileName(Context context, Uri uri) {
String result = null;
if (uri.getScheme().equals("content")) {
Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
try {
if (cursor != null && cursor.moveToFirst()) {
result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null) {
cursor.close();
}
}
}
if (result == null) {
result = uri.getPath();
int cut = result.lastIndexOf(File.separator);
if (cut != -1) {
result = result.substring(cut + 1);
}
}
return result;
}
static String getRealPathFromURI(Context context, Uri contentUri) {
Cursor cursor = context.getContentResolver().query(contentUri, null, null, null, null);
if (cursor == null) {
return contentUri.getPath();
} else {
cursor.moveToFirst();
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
String realPath = cursor.getString(index);
cursor.close();
return realPath;
}
}
static File rename(File file, String newName) {
File newFile = new File(file.getParent(), newName);
if (!newFile.equals(file)) {
if (newFile.exists()) {
if (newFile.delete()) {
Log.d("FileUtil", "Delete old " + newName + " file");
}
}
if (file.renameTo(newFile)) {
Log.d("FileUtil", "Rename file to " + newName);
}
}
return newFile;
}
static int copy(InputStream input, OutputStream output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
static long copyLarge(InputStream input, OutputStream output)
throws IOException {
return copyLarge(input, output, new byte[DEFAULT_BUFFER_SIZE]);
}
static long copyLarge(InputStream input, OutputStream output, byte[] buffer)
throws IOException {
long count = 0;
int n;
while (EOF != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
}
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.media.ExifInterface;
import android.net.Uri;
import android.text.TextUtils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Created by aupadhyay on 1/31/17.
*/
class ImageUtil {
private ImageUtil() {
}
static Bitmap getScaledBitmap(Context context, Uri imageUri, float maxWidth, float maxHeight, Bitmap.Config bitmapConfig) {
String filePath = FileUtil.getRealPathFromURI(context, 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);
if (bmp == null) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();
} catch (FileNotFoundException exception) {
exception.printStackTrace();
} catch (IOException exception) {
exception.printStackTrace();
}
}
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
if (actualWidth < 0 || actualHeight < 0) {
Bitmap bitmap2 = BitmapFactory.decodeFile(filePath);
actualWidth = bitmap2.getWidth();
actualHeight = bitmap2.getHeight();
}
float imgRatio = (float) 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);
if (bmp == null) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();
} catch (FileNotFoundException exception) {
exception.printStackTrace();
} catch (IOException exception) {
exception.printStackTrace();
}
}
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, bitmapConfig);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, 0, 0);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, 0, 0, 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);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(),
matrix, true);
} catch (IOException e) {
e.printStackTrace();
}
return scaledBitmap;
}
static File compressImage(Context context, Uri imageUri, float maxWidth, float maxHeight,
Bitmap.CompressFormat compressFormat, Bitmap.Config bitmapConfig,
int quality, String parentPath, String prefix, String fileName) {
FileOutputStream out = null;
String filename = generateFilePath(context, parentPath, imageUri, compressFormat.name().toLowerCase(), prefix, fileName);
try {
out = new FileOutputStream(filename);
//write the compressed bitmap at the destination specified by filename.
ImageUtil.getScaledBitmap(context, imageUri, maxWidth, maxHeight, bitmapConfig).compress(compressFormat, quality, out);
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException ignored) {
}
}
return new File(filename);
}
private static String generateFilePath(Context context, String parentPath, Uri uri,
String extension, String prefix, String fileName) {
File file = new File(parentPath);
if (!file.exists()) {
file.mkdirs();
}
/** if prefix is null, set prefix "" */
prefix = TextUtils.isEmpty(prefix) ? "" : prefix;
/** reset fileName by prefix and custom file name */
fileName = TextUtils.isEmpty(fileName) ? prefix + FileUtil.splitFileName(FileUtil.getFileName(context, uri))[0] : fileName;
return file.getAbsolutePath() + File.separator + fileName + "." + extension;
}
private 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;
}
}
import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import java.io.File;
import rx.Observable;
import rx.functions.Func0;
/**
* Created by aupadhyay on 1/31/17.
*/
public class CompressImage {
private static volatile CompressImage INSTANCE;
private Context context;
//max width and height values of the compressed image is taken as 612x816
private float maxWidth = 612.0f;
private float maxHeight = 816.0f;
private Bitmap.CompressFormat compressFormat = Bitmap.CompressFormat.JPEG;
private Bitmap.Config bitmapConfig = Bitmap.Config.ARGB_8888;
private int quality = 80;
private String destinationDirectoryPath;
private String fileNamePrefix;
private String fileName;
private CompressImage(Context context) {
this.context = context;
destinationDirectoryPath = context.getCacheDir().getPath() + File.pathSeparator + FileUtil.FILES_PATH;
}
public static CompressImage getDefault(Context context) {
if (INSTANCE == null) {
synchronized (CompressImage.class) {
if (INSTANCE == null) {
INSTANCE = new CompressImage(context);
}
}
}
return INSTANCE;
}
public File compressToFile(File file) {
return ImageUtil.compressImage(context, Uri.fromFile(file), maxWidth, maxHeight,
compressFormat, bitmapConfig, quality, destinationDirectoryPath,
fileNamePrefix, fileName);
}
public Bitmap compressToBitmap(File file) {
return ImageUtil.getScaledBitmap(context, Uri.fromFile(file), maxWidth, maxHeight, bitmapConfig);
}
public Observable<File> compressToFileAsObservable(final File file) {
return Observable.defer(new Func0<Observable<File>>() {
@Override
public Observable<File> call() {
return Observable.just(compressToFile(file));
}
});
}
public Observable<Bitmap> compressToBitmapAsObservable(final File file) {
return Observable.defer(new Func0<Observable<Bitmap>>() {
@Override
public Observable<Bitmap> call() {
return Observable.just(compressToBitmap(file));
}
});
}
public static class Builder {
private CompressImage compressImage;
public Builder(Context context) {
compressImage = new CompressImage(context);
}
public Builder setMaxWidth(float maxWidth) {
compressImage.maxWidth = maxWidth;
return this;
}
public Builder setMaxHeight(float maxHeight) {
compressImage.maxHeight = maxHeight;
return this;
}
public Builder setCompressFormat(Bitmap.CompressFormat compressFormat) {
compressImage.compressFormat = compressFormat;
return this;
}
public Builder setBitmapConfig(Bitmap.Config bitmapConfig) {
compressImage.bitmapConfig = bitmapConfig;
return this;
}
public Builder setQuality(int quality) {
compressImage.quality = quality;
return this;
}
public Builder setDestinationDirectoryPath(String destinationDirectoryPath) {
compressImage.destinationDirectoryPath = destinationDirectoryPath;
return this;
}
public Builder setFileNamePrefix(String prefix) {
compressImage.fileNamePrefix = prefix;
return this;
}
public Builder setFileName(String fileName) {
compressImage.fileName = fileName;
return this;
}
public CompressImage build() {
return compressImage;
}
}
}
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Created by aupadhyay on 1/31/17.
*/
public class FileUtil {
static final String FILES_PATH = "CompressImage";
private static final int EOF = -1;
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
private FileUtil() {
}
public static File from(Context context, Uri uri) throws IOException {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
String fileName = getFileName(context, uri);
String[] splitName = splitFileName(fileName);
File tempFile = File.createTempFile(splitName[0], splitName[1]);
tempFile = rename(tempFile, fileName);
tempFile.deleteOnExit();
FileOutputStream out = null;
try {
out = new FileOutputStream(tempFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (inputStream != null) {
copy(inputStream, out);
inputStream.close();
}
if (out != null) {
out.close();
}
return tempFile;
}
static String[] splitFileName(String fileName) {
String name = fileName;
String extension = "";
int i = fileName.lastIndexOf(".");
if (i != -1) {
name = fileName.substring(0, i);
extension = fileName.substring(i);
}
return new String[]{name, extension};
}
static String getFileName(Context context, Uri uri) {
String result = null;
if (uri.getScheme().equals("content")) {
Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
try {
if (cursor != null && cursor.moveToFirst()) {
result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null) {
cursor.close();
}
}
}
if (result == null) {
result = uri.getPath();
int cut = result.lastIndexOf(File.separator);
if (cut != -1) {
result = result.substring(cut + 1);
}
}
return result;
}
static String getRealPathFromURI(Context context, Uri contentUri) {
Cursor cursor = context.getContentResolver().query(contentUri, null, null, null, null);
if (cursor == null) {
return contentUri.getPath();
} else {
cursor.moveToFirst();
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
String realPath = cursor.getString(index);
cursor.close();
return realPath;
}
}
static File rename(File file, String newName) {
File newFile = new File(file.getParent(), newName);
if (!newFile.equals(file)) {
if (newFile.exists()) {
if (newFile.delete()) {
Log.d("FileUtil", "Delete old " + newName + " file");
}
}
if (file.renameTo(newFile)) {
Log.d("FileUtil", "Rename file to " + newName);
}
}
return newFile;
}
static int copy(InputStream input, OutputStream output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
static long copyLarge(InputStream input, OutputStream output)
throws IOException {
return copyLarge(input, output, new byte[DEFAULT_BUFFER_SIZE]);
}
static long copyLarge(InputStream input, OutputStream output, byte[] buffer)
throws IOException {
long count = 0;
int n;
while (EOF != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
}
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.media.ExifInterface;
import android.net.Uri;
import android.text.TextUtils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Created by aupadhyay on 1/31/17.
*/
class ImageUtil {
private ImageUtil() {
}
static Bitmap getScaledBitmap(Context context, Uri imageUri, float maxWidth, float maxHeight, Bitmap.Config bitmapConfig) {
String filePath = FileUtil.getRealPathFromURI(context, 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);
if (bmp == null) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();
} catch (FileNotFoundException exception) {
exception.printStackTrace();
} catch (IOException exception) {
exception.printStackTrace();
}
}
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
if (actualWidth < 0 || actualHeight < 0) {
Bitmap bitmap2 = BitmapFactory.decodeFile(filePath);
actualWidth = bitmap2.getWidth();
actualHeight = bitmap2.getHeight();
}
float imgRatio = (float) 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);
if (bmp == null) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();
} catch (FileNotFoundException exception) {
exception.printStackTrace();
} catch (IOException exception) {
exception.printStackTrace();
}
}
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, bitmapConfig);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, 0, 0);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, 0, 0, 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);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(),
matrix, true);
} catch (IOException e) {
e.printStackTrace();
}
return scaledBitmap;
}
static File compressImage(Context context, Uri imageUri, float maxWidth, float maxHeight,
Bitmap.CompressFormat compressFormat, Bitmap.Config bitmapConfig,
int quality, String parentPath, String prefix, String fileName) {
FileOutputStream out = null;
String filename = generateFilePath(context, parentPath, imageUri, compressFormat.name().toLowerCase(), prefix, fileName);
try {
out = new FileOutputStream(filename);
//write the compressed bitmap at the destination specified by filename.
ImageUtil.getScaledBitmap(context, imageUri, maxWidth, maxHeight, bitmapConfig).compress(compressFormat, quality, out);
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException ignored) {
}
}
return new File(filename);
}
private static String generateFilePath(Context context, String parentPath, Uri uri,
String extension, String prefix, String fileName) {
File file = new File(parentPath);
if (!file.exists()) {
file.mkdirs();
}
/** if prefix is null, set prefix "" */
prefix = TextUtils.isEmpty(prefix) ? "" : prefix;
/** reset fileName by prefix and custom file name */
fileName = TextUtils.isEmpty(fileName) ? prefix + FileUtil.splitFileName(FileUtil.getFileName(context, uri))[0] : fileName;
return file.getAbsolutePath() + File.separator + fileName + "." + extension;
}
private 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;
}
}
import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import java.io.File;
import rx.Observable;
import rx.functions.Func0;
/**
* Created by aupadhyay on 1/31/17.
*/
public class CompressImage {
private static volatile CompressImage INSTANCE;
private Context context;
//max width and height values of the compressed image is taken as 612x816
private float maxWidth = 612.0f;
private float maxHeight = 816.0f;
private Bitmap.CompressFormat compressFormat = Bitmap.CompressFormat.JPEG;
private Bitmap.Config bitmapConfig = Bitmap.Config.ARGB_8888;
private int quality = 80;
private String destinationDirectoryPath;
private String fileNamePrefix;
private String fileName;
private CompressImage(Context context) {
this.context = context;
destinationDirectoryPath = context.getCacheDir().getPath() + File.pathSeparator + FileUtil.FILES_PATH;
}
public static CompressImage getDefault(Context context) {
if (INSTANCE == null) {
synchronized (CompressImage.class) {
if (INSTANCE == null) {
INSTANCE = new CompressImage(context);
}
}
}
return INSTANCE;
}
public File compressToFile(File file) {
return ImageUtil.compressImage(context, Uri.fromFile(file), maxWidth, maxHeight,
compressFormat, bitmapConfig, quality, destinationDirectoryPath,
fileNamePrefix, fileName);
}
public Bitmap compressToBitmap(File file) {
return ImageUtil.getScaledBitmap(context, Uri.fromFile(file), maxWidth, maxHeight, bitmapConfig);
}
public Observable<File> compressToFileAsObservable(final File file) {
return Observable.defer(new Func0<Observable<File>>() {
@Override
public Observable<File> call() {
return Observable.just(compressToFile(file));
}
});
}
public Observable<Bitmap> compressToBitmapAsObservable(final File file) {
return Observable.defer(new Func0<Observable<Bitmap>>() {
@Override
public Observable<Bitmap> call() {
return Observable.just(compressToBitmap(file));
}
});
}
public static class Builder {
private CompressImage compressImage;
public Builder(Context context) {
compressImage = new CompressImage(context);
}
public Builder setMaxWidth(float maxWidth) {
compressImage.maxWidth = maxWidth;
return this;
}
public Builder setMaxHeight(float maxHeight) {
compressImage.maxHeight = maxHeight;
return this;
}
public Builder setCompressFormat(Bitmap.CompressFormat compressFormat) {
compressImage.compressFormat = compressFormat;
return this;
}
public Builder setBitmapConfig(Bitmap.Config bitmapConfig) {
compressImage.bitmapConfig = bitmapConfig;
return this;
}
public Builder setQuality(int quality) {
compressImage.quality = quality;
return this;
}
public Builder setDestinationDirectoryPath(String destinationDirectoryPath) {
compressImage.destinationDirectoryPath = destinationDirectoryPath;
return this;
}
public Builder setFileNamePrefix(String prefix) {
compressImage.fileNamePrefix = prefix;
return this;
}
public Builder setFileName(String fileName) {
compressImage.fileName = fileName;
return this;
}
public CompressImage build() {
return compressImage;
}
}
}
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, PICK_IMAGE_REQUEST); // private static final int PICK_IMAGE_REQUEST = 1;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK) {
if (data == null) {
//Failed to open picture!
return;
}
try {
actualImage = FileUtil.from(this, data.getData());// conversion to file is important.
} catch (IOException e) {
//Failed to read picture data!
e.printStackTrace();
}
}
}
现在我认为您不应该出现错误。它说压缩图像为空：E/BitmapFactory:无法解码流：java.io.FileNotFoundException:/android.os.ParcelFileDescriptor$AutoCloseInputStream@87832dd：open failed:enoint（没有这样的文件或目录）@AndyStrife:更新了我的答案我就是这么做的，但不起作用。我还在调查