Android中由于设置的背景图片太大导致OOM

Android中由于设置的背景图片太大可能会导致OOM

例如mImageView.setImageBitmap();

布局文件中

android:background="@drawable/xxx.jpg"

下面提供其中的一种处理方式：

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,                                                             int reqWidth, int reqHeight) {            // First decode with inJustDecodeBounds=true to check dimensions            final BitmapFactory.Options options = new BitmapFactory.Options();            options.inJustDecodeBounds = true;            BitmapFactory.decodeResource(res, resId, options);            // Calculate inSampleSize            options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);            // Decode bitmap with inSampleSize set            options.inJustDecodeBounds = false;            return BitmapFactory.decodeResource(res, resId, options);        }        public static 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) {                // Calculate ratios of height and width to requested height and width                final int heightRatio = Math.round((float) height / (float) reqHeight);                final int widthRatio = Math.round((float) width / (float) reqWidth);                // 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;        }

通过在代码中对所需要加载的图片进行处理，得到的bitmap设置到控件上即可。

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