Question

我正在尝试decode和encode Bitmap图片。在某些设备上，它可以完美运行，而在其他设备上则不然。我正在将Base64 String上传到服务器并从服务器获取Base64 String。我找到了各种解决方案，但仍然无法解决我的问题。这是我的代码：

编码：

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 = "";
            }

        }
}

解码：

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 HTOARkEbyAC9qus6T4e0vVNe13UrHRdE020N7qWo392lhY2NpEW828v9RldFjVQNo3MFA6sSAx/F P9pL/gsz8O/CI1Lw/wDs0aHb/E7XrAx2f/Cf+K59T0v4YpJudt2l6bBKviLxqxICPGkvhq1ICkeM sGQt+WH7a/7fXxU/a91y+8OWR1Dwl8FNNvr5fD3gKxvPm8Q7dSYaX4k+IZyza3rRwP8AinXLeD/C Axud2J8cH4A9STg9uM4wW3dDzkbTz06DnNfk2e8eK7y/h+zklZT12UpXtq7JJ7PpZNSuz9I4f4D5 teIeeCVvdVt01q0k3e+vuuydlqmr/Z3xD/b9/bG+MF/qI1342+LPD+n34AXw98M7v/hAbDTRlu+k H/hIDnqSfFBPGCc4J8os4fEPiC/Oo6/4g17xBf8A/QR17WdR1DUOCR/zGCe54/HqBmvNPCUKrn5u nTgjAywOck9c/XJI5619JeHNPOCQeQCMH/eI7+wyO2eOSRn4NYrH41t5m3dveyV0nKzvr31WyunJ 6o+8jhMvwClHK4pKNtFe28r317Rut+sU2lr0ng+58Z+HSR4R8XeLfD4JGDoHifxD4fPBYnjR+cnv 36DJJBr7e+GH7a/7W/w8Vtvj4ePrLgCx+JNiNesASSM/2oT4X10kAng+JyM5yCWNeGeGdDLknONv /AuuR3z6e/bnu3s1l4GPpn19sbscD8QfToCelethcVj8B/yLnZaddX703ZpuOkm23rtbqrnk4nB5 fj+b+0tZaW085Xs76OyV2mpXsrtt3/WD4Eft+/DD4n3Gm+G/HtvL8MfGN+6WNna6lfJf+FdTvlLA jS/EsSIg344XXEt2ByVcOH3foIgCA4+6e/PYnsSTySfzr+XXxF4L+8DznbyDjODJjr0x6/gc19ff sm/tt33ws1G0+GHxo19r3wI5Sw0Pxhrd8Bf+BGUBUsNZ1NzsbweqIo38HwpGsMErNEqKv3WQcYJy 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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;
}

错误堆栈：

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)

我也在某些设备中收到此错误：

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)

我已经尝试过的解决方案是：

Answer 1

在文件Bitmap中显示ImageView时，首先在BitmapHelper.decodeFile(picturePath, 200, 200, true)的帮助下对其进行解码，这将返回压缩的Bitmap，以便在编码此位图时可以处理高分辨率图像以及高达100 MB文件的重磅图像。

解码文件后，将其设置为ImageView，并使用Base64类在压缩图像上方获取BitmapHelper字符串形式;从Bitmap获取ImageView（即已经压缩）并使用ImageBase64.encodeTobase64(bitmap)这将再次压缩文件，并在OutOfMemory a {{Encoding Bitmap时处理decoding异常1}}。

对于Base64String，首先将Bytes写入设备内存中的文件。然后以块的形式阅读ByteArray并解码decodeFile()，你将在你的记忆中得到你的位图。在使用Bitmap方法缩小此位图后，您将从Base64String压缩encoding

我搜索了各种各样的博客并发布了帖子，我发布了最合适的代码并将它们组合成一个以提高可靠性。尝试使用以下代码，以便通过理论管理更快地decoding和Base64String。

解码Bitmap bitmap = ImageBase64.decodeBase64(base64ImageStr,MainActivity.this); imageView.setImageBitmap(bitmap); bitmap = null; System.gc();

Bitmap

编码imageView.setImageBitmap(BitmapHelper.decodeFile(picturePath, 200, 200, true)); Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap(); base64ImageStr = ImageBase64.encodeTobase64(bitmap);试试这个：

ImageBase64

试用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; } }

的此代码

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;
    }

}

添加此类以处理繁重的图像

{{1}}

Answer 2

我建议你：

如果您使用基于xml的协议从服务器接收数据 - 请使用 SAX 解析器而不是DOM。
不要将整个base64字符串加载到内存中。使用InputStream将部分数据加载到byte[]数组中，从数组中解码Base64，并通过FileOutputStream将结果附加到缓存文件。
使用options.inJustDecodeBounds选项可防止将满量程位图文件加载到内存中。例如，您可以评估所需的内存总量，并决定将其缩小。的 UPD 即可。我注意到你已经在使用它了。
请记住您持有的对象引用并通过方法流程。强引用可防止GC回收内存。

遵循您的代码：方法decodeBase64在堆栈中保存String input参数参数，byte[] decodedByte引用并在最后返回BitmapFactory.decodeStream(new FileInputStream(f), null, o2)。同时将所有这些对象保存在内存中意味着GC和内存分配的压力很大。作为一个最简单的解决方案，您可以在使用相应的对象（字符串和字节数组）之后null引用，因此GC将能够释放它们。

Answer 3

尝试使用此伪代码：如果您有任何问题，请告诉我

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);

Answer 4

只需在清单文件中增加应用程序的堆大小。

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" >

Answer 5

您不是base64编码Bitmap实例（正如您在帖子中甚至在主题中所建议的那样），而是b中的字节数组String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);。字节数组＆＃39; b＆＃39;如果要将这些字节写入文件，则包含.jpg文件内容的字节。

您需要做的是将要上传的.jpg文件的内容直接放在字节数组中。然后编码该数组。

Google android put file content in byte array。代码已在本网站上多次发布

Answer 6

正如greenapps建议的那样，最好避免使用Bitmap和BitmapFactory来传输文件：

FileInputStream fis = new FileInputStream(imageFile);
byte[] byteArray = inputStreamToByteArray(fis);
String base64ImageSend = Base64.encodeToString(byteArray, Base64.NO_WRAP);

其中：

/**
 * 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();
}

实际上，如Kai所述，outOfMemory问题是由于您正在解码全分辨率和高质量图像。避免这种情况的更好方法是对图像进行下采样：

/**
 * 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 &#8469;</code>, such that
 * <code>min<sub>k</sub>(requestedWidth-options.outWidth&times;<b>s<sub>k</sub></b>)&gt;0</code>
 * <code>&&</code>
 * <code>min<sub>k</sub>(requestedHeight-options.outHeight&times;<b>s<sub>k</sub></b>)&gt;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>,
 * &gt;1 if the image needs to be down-sampled,
 * &lt;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;
}

Answer 7

你可以尝试这个，它可以解决你的问题。

基本上首先将数据保存到文件中，使用缓冲区来避免内存问题。之后我们检查并调整文件大小 - 直接加载调整大小的位图，再次避免内存问题。

根据我的假设，您从服务器获取编码字符串...因此您可以管理代码以直接写入文件。

将数据写入文件：

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);
    }

从图像文件创建缩略图：

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();
        }
    }
}

仅加载已调整大小的位图：

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);
}

计算采样值 - 由Google提供，您可以找到他们的教程：

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;
}

将Base64字符串解码并编码为Bitmap时出现OutOfMemoryError

7 个答案: