Android图片处理：识别图像方向并显示实例教程

public class IOHelper {
......
/** 从给定路径加载图片*/
public static Bitmap loadBitmap(String imgpath) {
return BitmapFactory.decodeFile(imgpath);
}
/** 从给定的路径加载图片，并指定是否自动旋转方向*/
public static Bitmap loadBitmap(String imgpath, boolean adjustOritation) {
if (!adjustOritation) {
return loadBitmap(imgpath);
} else {
Bitmap bm = loadBitmap(imgpath);
int digree = 0;
ExifInterface exif = null;
try {
exif = new ExifInterface(imgpath);
} catch (IOException e) {
e.printStackTrace();
exif = null;
}
if (exif != null) {
// 读取图片中相机方向信息
int ori = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_UNDEFINED);
// 计算旋转角度
switch (ori) {
case ExifInterface.ORIENTATION_ROTATE_90:
digree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
digree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
digree = 270;
break;
default:
digree = 0;
break;
}
}
if (digree != 0) {
// 旋转图片
Matrix m = new Matrix();
m.postRotate(digree);
bm = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),
bm.getHeight(), m, true);
}
return bm;
}
}
......
}