处理getdrawable的方法引起的OOM异常

在将图片用getdrawable的方法转换成bitmap时会出现OOM，下面的方法就是怎么去避免因为这种操作或类似操作而引起的OOM。

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) {

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;

}

private Bitmap compressImage(Bitmap image) {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中

int options = 100;

while ( baos.toByteArray().length / 1024>10) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩

baos.reset();//重置baos即清空baos

options -= 10;//每次都减少10

image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中

}

ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中

Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片

return bitmap;

}