android-external-storage

问题 In my application, I need to store lots of images in the device storage. Such files tend to fulfill the device storage, and I want to allow users to be able to choose external SD card as the destination folder. I read everywhere that Android doesn\'t allow users to write to external SD card, by SD card I mean the external and mountable SD card and not the external storage , but file manager applications manage to write to External SD on all Android versions. What is the better way to grant

问题 I\'m trying to access media files (music) on the users device to play them; an easy \"hello world\"-music player app. I\'ve followed some tutorials and they basically give the same code. But it won\'t work; it keeps crashing and telling me: error..... Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=27696, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or