android studio java.io.filenotfoundexception Save text file

Question

I have copy an example from developer page:

String FILENAME = "hello_file";
String string = "hello world!";
FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();

but it says that that:

exception java.io.filenotfoundexception on : openFileOutput(FILENAME, Context.MODE_PRIVATE)

Answer 1

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

In the manifest

More on: http://developer.android.com/guide/topics/security/permissions.html