BitmapFactory解码图片不显示(项目中的 bug)
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安卓Bitmap too large to be uploaded into a texture (3120x4208, max=4096x4096
BitmapFactory.decodeFile(imageFile);
用BitmapFactory解码一张图片时,有时会遇到该错误。这往往是由于图片过大造成的。要想正常使用,则需要分配更少的内存空间来存储。
BitmapFactory.Options.inSampleSize
设置恰当的inSampleSize可以使BitmapFactory分配更少的空间以消除该错误。inSampleSize的具体含义请参考SDK文档。例如:
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = 4;
Bitmap bitmap = BitmapFactory.decodeFile(imageFile, opts);
设置恰当的inSampleSize是解决该问题的关键之一。BitmapFactory.Options提供了另一个成员inJustDecodeBounds。
BitmapFactory.Options opts = new BitmapFactory.Options();opts.inJustDecodeBounds = true;Bitmap bitmap = BitmapFactory.decodeFile(imageFile, opts);
设置inJustDecodeBounds为true后,decodeFile并不分配空间,但可计算出原始图片的长度和宽度,即opts.width和opts.height。有了这两个参数,再通过一定的算法,即可得到一个恰当的inSampleSize。
查看Android源码,我们得知,为了得到恰当的inSampleSize,Android提供了一种动态计算的方法。
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; }} 使用该算法,就可动态计算出图片的inSampleSize。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) { }
综合上述,完整代码是:
- public static Bitmap createImageThumbnail(String filePath){
- Bitmap bitmap = null;
- BitmapFactory.Options opts = new BitmapFactory.Options();
- opts.inJustDecodeBounds = true;
- BitmapFactory.decodeFile(filePath, opts);
- opts.inSampleSize = computeSampleSize(opts, -1, 128*128);
- opts.inJustDecodeBounds = false;
- try {
- bitmap = BitmapFactory.decodeFile(filePath, opts);
- }catch (Exception e) {
- // TODO: handle exception
- }
- return bitmap;
- }
- 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;
- }
- }
转载地址:http://blog.csdn.net/hustpzb/article/details/8363372
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