如何从 InputStream 而不是 File 获取 Exif 数据?
How to get Exif data from an InputStream rather than a File?
我问这个的原因是因为文件选择器 Intent
returns 一个 Uri
.
的回调
通过 Intent 打开文件选择器:
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), CHOOSE_IMAGE_REQUEST);
回调:
@Override
public void onActivityResult(int requestCode, int resultCode, final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CHOOSE_IMAGE_REQUEST && resultCode == Activity.RESULT_OK) {
if (data == null) {
// Error
return;
}
Uri fileUri = data.getData();
InputStream in = getContentResolver().openInputStream(fileUri);
// How to determine image orientation through Exif data here?
}
}
一种方法是将 InputStream
写入实际的 File
,但这对我来说似乎是一个糟糕的解决方法。
引入 25.1.0 支持库后,现在可以通过 InputStream
从 URI 内容(content:// 或 file://)读取 exif 数据。
示例:
首先将此行添加到您的 gradle 文件中:
compile 'com.android.support:exifinterface:25.1.0'
Uri uri; // the URI you've received from the other app
InputStream in;
try {
in = getContentResolver().openInputStream(uri);
ExifInterface exifInterface = new ExifInterface(in);
// Now you can extract any Exif tag you want
// Assuming the image is a JPEG or supported raw format
} catch (IOException e) {
// Handle any errors
} finally {
if (in != null) {
try {
in.close();
} catch (IOException ignored) {}
}
}
更多信息请查看:Introducing the ExifInterface Support Library, ExifInterface。
我问这个的原因是因为文件选择器 Intent
returns 一个 Uri
.
通过 Intent 打开文件选择器:
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), CHOOSE_IMAGE_REQUEST);
回调:
@Override
public void onActivityResult(int requestCode, int resultCode, final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CHOOSE_IMAGE_REQUEST && resultCode == Activity.RESULT_OK) {
if (data == null) {
// Error
return;
}
Uri fileUri = data.getData();
InputStream in = getContentResolver().openInputStream(fileUri);
// How to determine image orientation through Exif data here?
}
}
一种方法是将 InputStream
写入实际的 File
,但这对我来说似乎是一个糟糕的解决方法。
引入 25.1.0 支持库后,现在可以通过 InputStream
从 URI 内容(content:// 或 file://)读取 exif 数据。
示例: 首先将此行添加到您的 gradle 文件中:
compile 'com.android.support:exifinterface:25.1.0'
Uri uri; // the URI you've received from the other app
InputStream in;
try {
in = getContentResolver().openInputStream(uri);
ExifInterface exifInterface = new ExifInterface(in);
// Now you can extract any Exif tag you want
// Assuming the image is a JPEG or supported raw format
} catch (IOException e) {
// Handle any errors
} finally {
if (in != null) {
try {
in.close();
} catch (IOException ignored) {}
}
}
更多信息请查看:Introducing the ExifInterface Support Library, ExifInterface。