public Bitmap RotationPic(Bitmap tmpBitmap){
int x = tmpBitmap.getWidth();
int y = tmpBitmap.getHeight();
if(x > y){
Matrix matrix = new Matrix();
matrix.reset();
matrix.setRotate(90);
return Bitmap.createBitmap(tmpBitmap,0,0, x, y,matrix, true);
}
return tmpBitmap;
}上面代码中 Bitmap.createBitmap(tmpBitmap,0,0, x, y,matrix, true); 这句报错。
我是读取网络图片,而且图片的体积比较大,100k~300k 左右。
请问高手怎么解决啊?还有没有其他旋转图片的方法?matrixjava网络
opts.inSampleSize = computeSampleSize(opts, -1, 128*128);
Bitmap bitmap = BitmapFactory.decodeFile(filePath,opts);但旋转图片Bitmap.createBitmap()没有 opts.inSampleSize 这个设置。
scal-rotate->decode 很清晰阿, 你之前怎么做还怎么做呗。
public static Bitmap DecodeFileToBitmap (String path)
{
try
{
File f = new File(path); BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o); final int REQUIRED_SIZE=500; int scale=1;
while(o.outWidth/scale/2>=REQUIRED_SIZE && o.outHeight/scale/2>=REQUIRED_SIZE)
scale*=2; BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
Bitmap bm = BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
Bitmap bitmap = bm; ExifInterface exif = null;
try
{
exif = new ExifInterface(path); int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
Matrix m = new Matrix(); if ((orientation == 3))
{
m.postRotate(180);
m.postScale((float) bm.getWidth(), (float) bm.getHeight());
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),bm.getHeight(), m, true);
return bitmap;
}
else if (orientation == 6)
{
m.postRotate(90);
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),bm.getHeight(), m, true);
return bitmap;
}
else if (orientation == 8)
{
m.postRotate(270);
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),bm.getHeight(), m, true);
return bitmap;
} return bitmap;
} catch(Exception ex) {}
} catch (FileNotFoundException e) {}
return null;
}
替换成 Bitmap.createBitmap(tmpBitmap,0,0, y, x,matrix, true);
当把照片旋转90度,宽和高就相同。