【Android】Android内存溢出问题---用自行开辟的空间进行对内存管理
16lz
2021-01-23
public static Bitmap readBitmap(String path) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.RGB_565; options.inPurgeable = true; options.inInputShareable = true; options.inSampleSize = computeSampleSize(options, -1, 128 * 128); options.inJustDecodeBounds = true; // 自行在Android上开辟一段12K大小的内存空间，存储的图片放在该内存中 options.inTempStorage = new byte[12 * 1024]; // 获取资源图片 InputStream is; try { is = new FileInputStream(path); return BitmapFactory.decodeStream(is, null, options); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) { int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels); int roundedSize; if (initialSize <= 8) { roundedSize = 1; while (roundedSize < initialSize) { roundedSize <<= 1; } } else { roundedSize = (initialSize + 7) / 8 * 8; } return roundedSize; } private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) { double w = options.outWidth; double h = options.outHeight; int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math .sqrt(w * h / maxNumOfPixels)); int upperBound = (minSideLength == -1) ? 128 : (int) Math.min( Math.floor(w / minSideLength), Math.floor(h / minSideLength)); if (upperBound < lowerBound) { return lowerBound; } if ((maxNumOfPixels == -1) && (minSideLength == -1)) { return 1; } else if (minSideLength == -1) { return lowerBound; } else { return upperBound; } }
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