Android写入内部存储问题

Question

I've got an issue with writing to internal storage. I have read a lot of tutorials, but everywhere is this: FileOutputStream fOut = openFileOutput(FILENAME, Context.MODE_PRIVATE); But it says that openFileOutput is not a method.

Answer 1

openFileOutput is a method of Context class https://developer.android.com/reference/android/content/Context.html#openFileOutput(java.lang.String,%20int)

Activity is a subclass of Context . So if you are trying to call this method in Activity , it should be supported. If you trying to call it in some custom class, you should pass to it some instance of Context class or subclass (for example Activity instance)