问如何获得允许在android手机中使用颤音打开画廊？

EN

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

//  Add these to android/grade.properties file.
android.useAndroidX=true 
android.enableJetifier=true 

// Get from gallery
_getFromGallery() async {
   PickedFile pickedFile = await ImagePicker().getImage(
        source: ImageSource.gallery,
        maxWidth: 1800,
        maxHeight: 1800,
    );
    if (pickedFile != null) {
        File imageFile = File(pickedFile.path);
    }
}