最近做的一个需求
1在打开本地图库进行图片上传时图库图片在显示时出现了部分旋转,这里就需要有图片的判断是否旋转过
图片在获取时需要通过ExifInterface类来获取旋转
public static Bitmap getBitmap(String path) throws IOException
{
BufferedInputStream in = new BufferedInputStream(new FileInputStream(new File(path)));
BitmapFactory.Options options = new BitmapFactory.Options();
ExifInterface exif = new ExifInterface(path);
int mInt = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, options);
in.close();
int i = 0;
Bitmap bitmap = null;
while (true)
{
if ((options.outWidth >> i <= 1000)
&& (options.outHeight >> i <= 1000))
{
in = new BufferedInputStream(new FileInputStream(new File(path)));
options.inSampleSize = (int) Math.pow(2.0D, i);
options.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeStream(in, null, options);
break;
}
i += 1;
}
int digree = 0;
//对返回值的判断
switch (mInt) {
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);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight(), m, true);
}
return bitmap;
}
2如果拿出每个图片的旋转度数并根据旋转的度数来从新绘制图片可以通过
/**
* 读取图片属性:旋转的角度
*
* @param path
* 图片绝对路径
* @return degree旋转的角度
*/
public int readPictureDegree(String path) {
int degree = 0;
try {
ExifInterface exifInterface = new ExifInterface(path);
int orientation = exifInterface.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return degree;
}
/*
* 旋转图片
*
* @param angle
*
* @param bitmap
*
* @return Bitmap
*/
public static Bitmap rotaingImageView(int angle, Bitmap bitmap) {
// 旋转图片 动作
Matrix matrix = new Matrix();
matrix.postRotate(angle);
// 创建新的图片
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), matrix, true);
return resizedBitmap;
}