使用以下代码从图库中选取图像：
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, PICK_FILE_RESULT_CODE);
使用以下代码获取结果：
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_FILE_RESULT_CODE) {
if (resultCode == RESULT_OK && data != null && data.getData() != null) {
// Get the Uri of the selected file
Uri uri = data.getData();
//Using Picasso to load uri to imageView
//Image is in landscape even if it was taken in portrait
}
}
}
该代码适用于 HTC 和 Nexus 手机，但仅适用于三星设备（Galaxy 5 和 Galaxy 5 mini），如果照片是纵向拍摄的，则方向错误。当查看 ExifInterface 时，方向未定义。
File imageFile = new File(uri.getPath());
ExifInterface exif = new ExifInterface(
imageFile.getAbsolutePath());
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
//orientation is always 0 for samsung devices = ORIENTATION_UNDEFINED
如何正确呈现图像或者确定正确的方向以便可以旋转图像？
我能够使用以下代码获得方向：
public static int getExifOrientation(Context context, Uri uri) {
ContentResolver contentResolver = context.getContentResolver();
Cursor cursor = null;
try {
String id = DocumentsContract.getDocumentId(uri);
id = id.split(":")[1];
cursor = contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
CONTENT_ORIENTATION, MediaStore.Images.Media._ID + " = ?", new String[] { id }, null);
if (cursor == null || !cursor.moveToFirst()) {
return 0;
}
return cursor.getInt(0);
} catch (RuntimeException ignored) {
// If the orientation column doesn't exist, assume no rotation.
return 0;
} finally {
if (cursor != null) {
cursor.close();
}
}
}
https://vikaskanani.wordpress.com/2011/07/17/android-re-size-image-without-loosing-exif-information/ https://vikaskanani.wordpress.com/2011/07/17/android-re-size-image-without-loosing-exif-information/
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