OutOfMemoryError lors du décodage et du codage de la chaîne Base64 en bitmap
J'essaie de decode et encode une image Bitmap. Sur certains appareils, il fonctionne parfaitement, tandis que sur d'autres, ce n'est pas le cas. Je télécharge Base64 String au serveur et obtenir Base64 String depuis le serveur. J'ai trouvé différentes solutions mais je ne parviens toujours pas à résoudre mon problème. Voici mon code:
Encodage:
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(
Intent.ACTION_PICK,
Android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
getActivity().startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
//Image loading from Gallery
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
imageView1.setImageBitmap(BitmapFactory.decodeFile(picturePath));
if (picturePath != null && !TextUtils.isEmpty(picturePath)) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap bitmap = BitmapFactory.decodeFile(picturePath, options);
base64ImageSend = ImageBase64.encodeTobase64(bitmap);
Log.i("Base 64 Image", base64ImageSend);
} else {
base64ImageSend = "";
}
}
}
Décodage:
private String base64StringReceive = "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCADhAOEDASIA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK U1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3 uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwD+/iii igAooooAKKKKACiiigAooriPH/xB8GfC7wd4i+IPj3XbHw54T8J6e+p+INe1BilnYaerFWkdgc8n 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button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Bitmap bitmap = ImageBase64.decodeBase64(base64StringReceive,MainActivity.this);
imageView2.setImageBitmap(bitmap);
}
});
ImageBase64.Java:
import Java.io.ByteArrayOutputStream;
import Android.graphics.Bitmap;
import Android.graphics.BitmapFactory;
import Android.util.Base64;
import Android.util.Log;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
Boolean isSDPresent = Android.os.Environment
.getExternalStorageState().equals(
Android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"myFile");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random Rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = Rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".jpg";// also tried .txt as file extension
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
return decodeFile(image); // BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
Pile d'erreur:
Java.lang.OutOfMemoryError
at Android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
at Android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.Java:510)
at Android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.Java:533)
at com.utility.ImageBase64.decodeBase64(ImageBase64.Java:32)
at com.activity.HomeFragment.onCreateView(HomeFragment.Java:138)
at Android.app.Fragment.performCreateView(Fragment.Java:1700)
at Android.app.FragmentManagerImpl.moveToState(FragmentManager.Java:890)
at Android.app.FragmentManagerImpl.moveToState(FragmentManager.Java:1062)
at Android.app.BackStackRecord.popFromBackStack(BackStackRecord.Java:773)
at Android.app.FragmentManagerImpl.popBackStackState(FragmentManager.Java:1498)
at Android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.Java:495)
at Android.app.Activity.onBackPressed(Activity.Java:2232)
at com.activity.MainActivity.onBackPressed(MainActivity.Java:534)
at Android.app.Activity.onKeyUp(Activity.Java:2210)
at Android.view.KeyEvent.dispatch(KeyEvent.Java:2664)
at Android.app.Activity.dispatchKeyEvent(Activity.Java:2440)
at com.Android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.Java:1962)
at Android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.Java:3884)
at Android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.Java:3858)
at Android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.Java:3426)
at Android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.Java:3476)
at Android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.Java:3445)
at Android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.Java:3552)
at Android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.Java:3453)
at Android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.Java:3609)
at Android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.Java:3426)
at Android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.Java:3476)
at Android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.Java:3445)
at Android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.Java:3453)
at Android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.Java:3426)
at Android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.Java:3476)
at Android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.Java:3445)
at Android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.Java:3585)
at Android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.Java:3750)
at Android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.Java:2027)
at Android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.Java:1721)
at Android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.Java:1712)
at Android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.Java:2004)
at Android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.Java:141)
at Android.os.MessageQueue.nativePollOnce(Native Method)
at Android.os.MessageQueue.next(MessageQueue.Java:138)
at Android.os.Looper.loop(Looper.Java:123)
at Android.app.ActivityThread.main(ActivityThread.Java:5050)
at Java.lang.reflect.Method.invokeNative(Native Method)
at Java.lang.reflect.Method.invoke(Method.Java:515)
at com.Android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.Java:806)
at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:622)
at dalvik.system.NativeStart.main(Native Method)
Je reçois également cette erreur sur certains appareils:
Java.lang.OutOfMemoryError: Failed to allocate a 38340876 byte allocation with 994361 free bytes and 971KB until OOM
at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
at Android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
at Android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.Java:655)
at Android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.Java:678)
at com.myapp.utility.ImageBase64.decodeBase64(ImageBase64.Java:53)
at com.myapp.activity.DetailProfileFragment.onCreateView(DetailProfileFragment.Java:103)
at Android.app.Fragment.performCreateView(Fragment.Java:2114)
at Android.app.FragmentManagerImpl.moveToState(FragmentManager.Java:904)
at Android.app.FragmentManagerImpl.moveToState(FragmentManager.Java:1082)
at Android.app.BackStackRecord.run(BackStackRecord.Java:833)
at Android.app.FragmentManagerImpl.execPendingActions(FragmentManager.Java:1467)
at Android.app.FragmentManagerImpl$1.run(FragmentManager.Java:452)
at Android.os.Handler.handleCallback(Handler.Java:739)
at Android.os.Handler.dispatchMessage(Handler.Java:95)
at Android.os.Looper.loop(Looper.Java:145)
at Android.app.ActivityThread.main(ActivityThread.Java:5944)
at Java.lang.reflect.Method.invoke(Native Method)
at Java.lang.reflect.Method.invoke(Method.Java:372)
at com.Android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.Java:1389)
at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:1184)
Les solutions que j'ai déjà essayées sont:
Lorsque vous affichez Bitmap dans ImageView à partir d'un fichier, décodez-le d'abord à l'aide de BitmapHelper.decodeFile(picturePath, 200, 200, true) cela renverra compressé Bitmap de sorte que lors de l'encodage de ce bitmap, vous puissiez gérer des images haute résolution ainsi que des images de taille lourde jusqu'à 100 Mo de fichier.
Après avoir décodé le fichier, définissez-le sur votre ImageView et obtenez Base64 Une forme de chaîne au-dessus de l'image compressée en utilisant la classe BitmapHelper; récupérez Bitmap à partir de votre ImageView (c'est-à-dire déjà compressé) et utilisez ImageBase64.encodeTobase64(bitmap) cela compressera à nouveau le fichier et fera exception à la poignée OutOfMemory tandis que Encoding a Bitmap.
Pour decoding, écrivez d'abord votre Base64String Dans la mémoire de votre appareil. Ensuite, lisez Bytes en morceaux et décodez que ByteArray par ceci, vous aurez votre bitmap dans votre mémoire. Après avoir réduit cette image bitmap en utilisant la méthode decodeFile(), vous aurez compressé Bitmap à partir de Base64String
J'ai recherché divers blogs et messages et à partir d'eux, j'ai pris le meilleur code approprié et les ai combinés en un seul pour le rendre plus fiable. Essayez le code ci-dessous pour accélérer encoding et decoding avec la gestion de la mémoire.
Pour décoder Base64String
Bitmap bitmap = ImageBase64.decodeBase64(base64ImageStr,MainActivity.this);
imageView.setImageBitmap(bitmap);
bitmap = null;
System.gc();
Pour encoder Bitmap Essayez ceci:
imageView.setImageBitmap(BitmapHelper.decodeFile(picturePath, 200, 200, true));
Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
base64ImageStr = ImageBase64.encodeTobase64(bitmap);
Essayez ce code pour ImageBase64
public class ImageBase64 {
private ImageBase64() {
super();
}
private static Context appContext;
public static String encodeTobase64(Bitmap image) {
ByteArrayOutputStream baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,100, baos);
byte [] b=baos.toByteArray();
String temp=null;
try{
System.gc();
temp=Base64.encodeToString(b, Base64.DEFAULT);
}catch(Exception e){
e.printStackTrace();
}catch(OutOfMemoryError e){
baos=new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG,50, baos);
b=baos.toByteArray();
temp=Base64.encodeToString(b, Base64.DEFAULT);
Log.e("EWN", "Out of memory error catched");
}
return temp;
}
public static Bitmap decodeBase64(String input,Context context) {
byte[] decodedByte = Base64.decode(input, 0);
appContext = context;
Boolean isSDPresent = Android.os.Environment
.getExternalStorageState().equals(
Android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(context.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random Rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = Rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".txt";
File image = new File(sdCardDirectory, nw);
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
outStream.write(input.getBytes());
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Compress bitmap path", image.getPath());
Bitmap bitmap;
try{
bitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}catch(OutOfMemoryError e){
e.printStackTrace();
InputStream is = context.getResources().openRawResource(R.drawable.default_profile_pic);
bitmap = BitmapFactory.decodeStream(is);
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
bitmap=null;
}
return bitmap;//BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
//return decodeFile(image);
}
private static Bitmap decodeFile(File f){
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=70;
//Find the correct scale value. It should be the power of 2.
int scale=1;
while(o.outWidth/scale>=REQUIRED_SIZE && o.outHeight/scale>=REQUIRED_SIZE)
scale*=2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
Boolean isSDPresent = Android.os.Environment
.getExternalStorageState().equals(
Android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"IMG");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random Rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = Rand.nextInt((1000 - 0) + 1) + 0;
String nw = "IMG_" + timeStamp + randomNum+".png";
File image = new File(sdCardDirectory, nw);
FileOutputStream out = null;
try {
out = new FileOutputStream(image);
bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
// PNG is a lossless format, the compression factor (100) is ignored
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
String pathNew =compressImage(image.getAbsolutePath());
Uri uri = Uri.parse(pathNew);
Bitmap bitmap=null ;
try {
bitmap = MediaStore.Images.Media.getBitmap(appContext.getContentResolver(),uri);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
} catch (FileNotFoundException e) {}
return null;
}
public static String compressImage(String imageUri) {
String filePath = imageUri;//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 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 String getFilename() {
/*File file = new File(Environment.getExternalStorageDirectory().getPath(), "IMG/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
*/
Boolean isSDPresent = Android.os.Environment
.getExternalStorageState().equals(
Android.os.Environment.MEDIA_MOUNTED);
File sdCardDirectory;
if (isSDPresent) {
// yes SD-card is present
sdCardDirectory = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getPath(),
"IMG/Images");
if (!sdCardDirectory.exists()) {
if (!sdCardDirectory.mkdirs()) {
Log.d("MySnaps", "failed to create directory");
}
}
} else {
// Sorry
sdCardDirectory = new File(appContext.getCacheDir(),"");
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
Random Rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = Rand.nextInt((1000 - 0) + 1) + 0;
String nw = "img_" + timeStamp + randomNum+".jpg";
File image = new File(sdCardDirectory, nw);
String uriSting1 = (sdCardDirectory.getAbsolutePath() + "/" + nw);//System.currentTimeMillis() + ".jpg");
return uriSting1;
}
}
Ajoutez cette classe pour gérer des images lourdes
public class BitmapHelper
{
//decodes image and scales it to reduce memory consumption
public static Bitmap decodeFile(String bitmapFile, int requiredWidth, int requiredHeight, boolean quickAndDirty)
{
try
{
//Decode image size
BitmapFactory.Options bitmapSizeOptions = new BitmapFactory.Options();
bitmapSizeOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapSizeOptions);
// load image using inSampleSize adapted to required image size
BitmapFactory.Options bitmapDecodeOptions = new BitmapFactory.Options();
bitmapDecodeOptions.inTempStorage = new byte[16 * 1024];
bitmapDecodeOptions.inSampleSize = computeInSampleSize(bitmapSizeOptions, requiredWidth, requiredHeight, false);
bitmapDecodeOptions.inPurgeable = true;
bitmapDecodeOptions.inDither = !quickAndDirty;
bitmapDecodeOptions.inPreferredConfig = quickAndDirty ? Bitmap.Config.RGB_565 : Bitmap.Config.ARGB_8888;
Bitmap decodedBitmap = BitmapFactory.decodeStream(new FileInputStream(bitmapFile), null, bitmapDecodeOptions);
// scale bitmap to mathc required size (and keep aspect ratio)
float srcWidth = (float) bitmapDecodeOptions.outWidth;
float srcHeight = (float) bitmapDecodeOptions.outHeight;
float dstWidth = (float) requiredWidth;
float dstHeight = (float) requiredHeight;
float srcAspectRatio = srcWidth / srcHeight;
float dstAspectRatio = dstWidth / dstHeight;
// recycleDecodedBitmap is used to know if we must recycle intermediary 'decodedBitmap'
// (DO NOT recycle it right away: wait for end of bitmap manipulation process to avoid
// Java.lang.RuntimeException: Canvas: trying to use a recycled bitmap Android.graphics.Bitmap@416ee7d8
// I do not excatly understand why, but this way it's OK
boolean recycleDecodedBitmap = false;
Bitmap scaledBitmap = decodedBitmap;
if (srcAspectRatio < dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) dstWidth, (int) (srcHeight * (dstWidth / srcWidth)));
// will recycle recycleDecodedBitmap
recycleDecodedBitmap = true;
}
else if (srcAspectRatio > dstAspectRatio)
{
scaledBitmap = getScaledBitmap(decodedBitmap, (int) (srcWidth * (dstHeight / srcHeight)), (int) dstHeight);
recycleDecodedBitmap = true;
}
// crop image to match required image size
int scaledBitmapWidth = scaledBitmap.getWidth();
int scaledBitmapHeight = scaledBitmap.getHeight();
Bitmap croppedBitmap = scaledBitmap;
if (scaledBitmapWidth > requiredWidth)
{
int xOffset = (scaledBitmapWidth - requiredWidth) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, xOffset, 0, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
else if (scaledBitmapHeight > requiredHeight)
{
int yOffset = (scaledBitmapHeight - requiredHeight) / 2;
croppedBitmap = Bitmap.createBitmap(scaledBitmap, 0, yOffset, requiredWidth, requiredHeight);
scaledBitmap.recycle();
}
if (recycleDecodedBitmap)
{
decodedBitmap.recycle();
}
decodedBitmap = null;
scaledBitmap = null;
return croppedBitmap;
}
catch (Exception ex)
{
ex.printStackTrace();
}
return null;
}
/**
* compute powerOf2 or exact scale to be used as {@link BitmapFactory.Options#inSampleSize} value (for subSampling)
*
* @param requiredWidth
* @param requiredHeight
* @param powerOf2
* weither we want a power of 2 sclae or not
* @return
*/
public static int computeInSampleSize(BitmapFactory.Options options, int dstWidth, int dstHeight, boolean powerOf2)
{
int inSampleSize = 1;
// Raw height and width of image
final int srcHeight = options.outHeight;
final int srcWidth = options.outWidth;
if (powerOf2)
{
//Find the correct scale value. It should be the power of 2.
int tmpWidth = srcWidth, tmpHeight = srcHeight;
while (true)
{
if (tmpWidth / 2 < dstWidth || tmpHeight / 2 < dstHeight)
break;
tmpWidth /= 2;
tmpHeight /= 2;
inSampleSize *= 2;
}
}
else
{
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) srcHeight / (float) dstHeight);
final int widthRatio = Math.round((float) srcWidth / (float) dstWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap drawableToBitmap(Drawable drawable)
{
if (drawable instanceof BitmapDrawable)
{
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
public static Bitmap getScaledBitmap(Bitmap bitmap, int newWidth, int newHeight)
{
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
}
Je vous suggère de:
Si vous recevez des données d'un serveur utilisant un protocole basé sur xml - utilisez [~ # ~] sax [~ # ~] analyseur au lieu de DOM.
Ne chargez pas la chaîne base64 entière dans la mémoire. Utilisez
InputStreampour charger une partie des données dans le tableaubyte[], Décode Base64 du tableau et ajoute le résultat à un fichier cache viaFileOutputStream.Utilisez l'option options.inJustDecodeBounds pour empêcher le chargement d'un fichier bitmap à grande échelle dans la mémoire. Vous pouvez évaluer la quantité totale de mémoire requise et prendre une décision de la réduire, par exemple. [~ # ~] upd [~ # ~] . J'ai remarqué que vous l'utilisez déjà.
Gardez à l'esprit les références aux objets que vous détenez et passez à travers votre flux de méthodes. Des références solides empêchent la mémoire d'être récupérée par GC.
Suivant votre code: la méthode decodeBase64 Contient le paramètre d'argument String input Dans la pile, la référence byte[] decodedByte Et renvoie BitmapFactory.decodeStream(new FileInputStream(f), null, o2) à la toute fin. Tenir tous ces objets en mémoire en même temps signifie une grande pression sur le GC et l'allocation de mémoire en général. Comme solution la plus simple, vous pouvez null faire référence juste après l'utilisation des objets correspondants (chaîne et tableau d'octets), afin que GC puisse les libérer.
Essayez avec ce pseudo code: faites-moi savoir si vous avez des questions
Bitmap bmp = (Bitmap) data.getExtras().get("data");
img.setImageBitmap(bmp);
btnadd.requestFocus();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
encodedImageString = Base64.encodeToString(b, Base64.DEFAULT);
byte[] bytarray = Base64.decode(encodedImageString, Base64.DEFAULT);
Bitmap bmimage = BitmapFactory.decodeByteArray(bytarray, 0,
bytarray.length);
Augmentez simplement la taille du tas de votre application dans le fichier manifeste.
Android:largeHeap="true"
eg:
<application
Android:allowBackup="true"
Android:icon="@drawable/ic_launcher"
Android:label="@string/app_name"
Android:theme="@style/Theme.AppTheme"
Android:largeHeap="true" >
Comme suggéré par greenapps, il serait préférable d'éviter d'utiliser Bitmap et BitmapFactory pour TRANSMETTRE le fichier:
FileInputStream fis = new FileInputStream(imageFile);
byte[] byteArray = inputStreamToByteArray(fis);
String base64ImageSend = Base64.encodeToString(byteArray, Base64.NO_WRAP);
où:
/**
* Convert an InputStream object into a byte array
* @param inputStream The InputStream to convert
* @return The byte[] representing the converted InputStream or null if the inputStream is null
*/
public static byte[] inputStreamToByteArray(InputStream inputStream) throws IOException {
if(inputStream==null) {
return null;
}
ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
byteBuffer.write(buffer, 0, len);
}
return byteBuffer.toByteArray();
}
En fait, le problème outOfMemory, comme l'a déclaré Kai, est dû au fait que vous décodez une image pleine résolution et de haute qualité. La meilleure façon d'éviter cela est de sous-échantillonner votre image:
/**
* Decode a file, representing an image, into a bitmap, trying to scale the original image if required
* @param context The application context
* @param file The image file
* @param requestedWidth The requested width
* @param requestedHeight The requested height
* @return The decoded bitmap or null if it is not possible to decode the file parameter
*/
public static Bitmap decodeImageFileIntoMutableBitmap(Context context, File file, int requestedWidth, int requestedHeight) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true; // just compute size, don't create bitmap
BitmapFactory.decodeFile(file.getAbsolutePath(), options);
float sampleSize = computeImageScaleCoefficient(options, requestedWidth, requestedHeight);
if (sampleSize == -1) {
return null;
}
else if (sampleSize <= 1) {
options.inSampleSize = 1;
}
else {
options.inSampleSize = (int) sampleSize;
}
options.inJustDecodeBounds = false; // compute size and create bitmap
/*it is possible to reduce the memory when decoding through skipping ARGB_8888 and using RGB_565 instead and inDither to true to preserve image quality.*/
//options.inPreferredConfig = Bitmap.Config.RGB_565;
//options.inDither = true;
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
if (bitmap == null) {
return null;
}
return bitmap;
}
/**
* Find the sample coefficient <code><b>s<sub>k</sub></b>=2<sup>k</sup></code>, with <code>k &isin ℕ</code>, such that
* <code>min<sub>k</sub>(requestedWidth-options.outWidth×<b>s<sub>k</sub></b>)>0</code>
* <code>&&</code>
* <code>min<sub>k</sub>(requestedHeight-options.outHeight×<b>s<sub>k</sub></b>)>0</code>
* @param options The BitmapFactory.Options instance of the original image user wants to scale
* @param requestedWidth The requested width
* @param requestedHeight The requested height
* @return -1 if if there is an error trying to decode the image
* or the sample coefficient <code><b>s<sub>k</sub></b></code>,
* >1 if the image needs to be down-sampled,
* <1 if the image needs to be up-sampled
*/
public static float computeImageScaleCoefficient(BitmapFactory.Options options, int requestedWidth, int requestedHeight) {
float sampleCoefficient = 1;
int imageWidth = options.outWidth;
int imageHeight = options.outHeight;
if (imageWidth == -1 || imageHeight == -1) {
return -1;
}
double outWidth = imageWidth;
double outHeight = imageHeight;
if ((outWidth > requestedWidth) || (outHeight > requestedHeight)) {
while ((outWidth > requestedWidth) || (outHeight > requestedHeight)) {
outWidth = Math.floor(outWidth/2.0);
outHeight = Math.floor(outHeight/2.0);
sampleCoefficient *= 2.0;
}
}
else {
while ((outWidth < requestedWidth) && (outHeight < requestedHeight)) {
outWidth *= 2;
outHeight *= 2;
if ((outWidth <= requestedWidth) && (outHeight <= requestedHeight)) {
sampleCoefficient /= 2.0;
}
}
}
return sampleCoefficient;
}
Vous n'encodez pas en base64 une instance Bitmap (comme vous le suggérez dans votre article et même dans le sujet) mais un tableau d'octets b dans String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);. Le tableau d'octets "b" contient les octets de ce qui serait le contenu d'un fichier .jpg si vous écriviez ces octets dans un fichier.
Ce que vous devez faire est de mettre le contenu du fichier .jpg que vous souhaitez télécharger directement dans un tableau d'octets. Encodez ensuite ce tableau.
Google pour Android put file content in byte array. Le code a été affiché plusieurs fois sur ce site
Vous pouvez essayer cela, cela devrait résoudre votre problème.
Fondamentalement, enregistrez d'abord les données dans un fichier, en utilisant un tampon pour éviter les problèmes de mémoire. Après cela, nous vérifions et redimensionnons le fichier - en chargeant directement un bitmap redimensionné, à nouveau pour éviter les problèmes de mémoire.
D'après ce que je peux supposer, vous obtenez la chaîne encodée d'un serveur ... afin que vous puissiez gérer votre code pour écrire directement dans le fichier.
Écriture des données dans le fichier:
private Bitmap getBitmapThumbnail(String base64StringReceive) {
byte[] data = Base64.decode(base64StringReceive, Base64.DEFAULT);
File file = new File(getFilesDir(), "testFile");
try {
BufferedOutputStream bos = new BufferedOutputStream(openFileOutput("testFile", Context.MODE_PRIVATE),1024);
bos.write(data);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return getThumbFromFile(file, false);
}
Création de la vignette à partir du fichier image:
private Bitmap getThumbFromFile(File file) {
Bitmap tempImage = null;
try {
tempImage = decodeSampledBitmapFromFile(file.getAbsolutePath(), 50, 50); // this is in pixels - use your desired size
return ThumbnailUtils.extractThumbnail(tempImage, 50, 50);
} finally {
if (tempImage != null) {
tempImage.recycle();
}
}
}
Chargement uniquement d'un bitmap redimensionné:
private Bitmap decodeSampledBitmapFromFile(String filePath, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(filePath, options);
}
Calcul de la valeur d'échantillonnage - fourni par Google, vous pouvez le trouver leurs tutoriels:
private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight &&
(halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}