Due to the needs of the project, there is no custom camera function, and only the camera program of the system is called. But there is a problem, that is, the picture displayed after taking the picture is actually a rotated picture....
Solution:
/**
* 获取图片的旋转角度，有些系统把拍照的图片旋转了，有的没有旋转
*/
int degree = readPictureDegree(f.getAbsolutePath());
BitmapFactory.Options opts=new BitmapFactory.Options();//获取缩略图显示到屏幕上
opts.inSampleSize=2;
Bitmap cbitmap=BitmapFactory.decodeFile(f.getAbsolutePath(),opts);
/**
* 把图片旋转为正的方向
*/
Bitmap newbitmap = rotaingImageView(degree, cbitmap);
iv.setImageBitmap(newbitmap);
/**
* 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 static 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);
System.out.println("angle2=" + angle);
// 创建新的图片
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(), matrix, true);
return resizedBitmap;
}Thank you for the information provided by http://blog.csdn.net/walker02/article/details/8211628
https://my.oschina.net/techstan/blog/142592
/**
* 获取图片的旋转角度
*
* @param path 图片绝对路径
* @return 图片的旋转角度
*/
public static int getBitmapDegree(String path) { int degree = 0; try { // 从指定路径下读取图片，并获取其EXIF信息 ExifInterface exifInterface = new ExifInterface(path); // 获取图片的旋转信息 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; } /** * 将图片按照指定的角度进行旋转 * * @param bitmap 需要旋转的图片 * @param degree 指定的旋转角度 * @return 旋转后的图片 */ public static Bitmap rotateBitmapByDegree(Bitmap bitmap, int degree) { // 根据旋转角度，生成旋转矩阵 Matrix matrix = new Matrix(); matrix.postRotate(degree); // 将原始图片按照旋转矩阵进行旋转，并得到新的图片 Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); if (bitmap != null && !bitmap.isRecycled()) { bitmap.recycle(); } return newBitmap; }The information that ExifInterface can get is far more than the rotation angle. Children's shoes who are interested in other parameters can look at the API documentation.