Bitmap out of memory error in android…

问题:

I am working in an android application and I am using a bitmap to bind an image to an ImageView. My requirement is to rotate that ImageView and give a border to that ImageView. I have successfully implemented this, but after the application uses this activity two-three times a "force close" error appears saying Bitmap out of VM memory. Please help me to minimize the bitmap memory consumption in my code. And let me know how to modify the code for the same?

final int BORDER_WIDTH = 5;
        // Set the border color
        final int BORDER_COLOR = Color.WHITE;
        Bitmap res = Bitmap.createBitmap(CAPTURE_IMAGE.getWidth() + 2
                * BORDER_WIDTH, CAPTURE_IMAGE.getHeight() + 2 * BORDER_WIDTH,
                CAPTURE_IMAGE.getConfig());
        System.gc();
        Canvas canvas = new Canvas(res);
        Paint paint = new Paint();
        paint.setColor(BORDER_COLOR);
        canvas.drawRect(0, 0, res.getWidth(), res.getHeight(), paint);

        canvas.drawBitmap(CAPTURE_IMAGE, BORDER_WIDTH, BORDER_WIDTH, paint);
        Matrix mat = new Matrix();
        // Set the Imageview position
        mat.postRotate(355);

        bMapRotate = Bitmap.createBitmap(res, 0, 0, res.getWidth(),
                res.getHeight(), mat, true);
        System.gc();
        res.recycle();
        res = null;
        paint = null;
        canvas = null;
        mat = null;
        // Set the captured bitmap image in the imageview
        mShareImageView.setImageBitmap(bMapRotate);

回答1:

I think you should use shrink function like this

bMapRotate = Bitmap.createBitmap(res, 0, 0, res.getWidth(),
                res.getHeight(), mat, true);


Bitmap myBitmap = ShrinkBitmap(bMapRotate , 300, 300);

mShareImageView.setImageBitmap(myBitmap );


private Bitmap ShrinkBitmap(String file, int width, int height) {
        // TODO Auto-generated method stub
        BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
        bmpFactoryOptions.inJustDecodeBounds = true;
        Bitmap bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);

        int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)height);
        int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)width);

        if (heightRatio > 1 || widthRatio > 1)
        {
         if (heightRatio > widthRatio)
         {
          bmpFactoryOptions.inSampleSize = heightRatio;
         } else {
          bmpFactoryOptions.inSampleSize = widthRatio;
         }
        }

        bmpFactoryOptions.inJustDecodeBounds = false;
        bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);
     return bitmap;
    }

it worked for me and i avoided Bitmap out of VM memory exception

回答2:

in mainfest file add ---> android:largeHeap:"true"

回答3:

Try moving the gc() call to the end. It should run after you set res = null so that it can release the unused memory:

    res.recycle();
    res = null;
    paint = null;
    canvas = null;
    mat = null;
    System.gc();

回答4:

Just add android:largeHeap="true" in your manifest file

Ref: largeHeap=true manifest tag not working?