1、當圖片過大，或圖片數量較多時使用BitmapFactory解碼圖片會出java.lang.OutOfMemoryError: bitmap size exceeds VM budget，要想正常使用則需分配更少的記憶體，具體的解決辦法是修改取樣值BitmapFactory.Options.inSampleSize，例如：

BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = 4;
Bitmap bitmap = BitmapFactory.decodeFile(imageFile, opts);
 

2、如何設定恰當的inSampleSize：

設定恰當的inSampleSize是解決該問題的關鍵之一。

BitMapFactoty.Options提供了另一個成員inJustDecodeBounds

BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(imageFile, opts);

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 the larger one when there is no overlapping zone.
		return lowerBound;
	}
	if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
		return 1;
	} else if (minSideLength == -1) {
		return lowerBound;
	} else {
		return upperBound;
	}
}
 

BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inJustDecodeBounds = true;
BitmapFactory.decodeFile(imageFile, opts);
opts.inSampleSize = computeSampleSize(opts, -1, 128 * 128);
opts.inJustDecodeBounds = false;
try {
	Bitmap bmp = BitmapFactory.decodeFile(imageFile, opts);
	imageView.setImageBitmap(bmp);
} catch (OutOfMemoryError err) {
}