Whether the read SD card directory exists, if so, please see if the permission to read the SD card is added in AndroidManifest.xml <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
Whether the read SD card directory exists, if so, please see if the permission to read the SD card is added in AndroidManifest.xml <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>