1.问题

Android12使用如下权限，将不会获得读写文件的权限

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

2.解决

if (!Environment.isExternalStorageManager()) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
            startActivity(intent);
            return;
        }