I used this to create folder/file in internal memory :
File mydir = context.getDir("mydir", Context.MODE_PRIVATE); //Creating an internal dir;
File fileWithinMyDir = new File(mydir, "myfile"); //Getting a file within the dir.
FileOutputStream out = new FileOutputStream(fileWithinMyDir); //Use the stream as usual to write into the file.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…