essadeq-elaamiri/basicContactsManager

Basic contact manager as a native android practical activity (Data persistence using file)

basicContactsManager

This is a native android present the basic functionalities of a contact management application, it is a practical activity, to learn how to deal with local storage in native android.

Specifications

1. the application based on two fragments, one represente the list of contacts, and the other represent the form to add a new contact.
2. the records inserted and loadded from a local json file.
3. I used Gson convert the objects to json to String and vice versa.

load data

@Override
    public HashMap<String, ContactModel> loadData(Context context) {
        /**
         * TODO: read the entire file, get the content as string
         * convert it to ContactsBook object and return it
         *
         */
        Gson gson = new Gson();
        String fileContent = readFromFile(context, JSON_FILE_NAME);
        Type listType = new TypeToken<HashMap<String, ContactModel>>(){}.getType();
        HashMap<String, ContactModel> contactModelHashMap = gson.fromJson(fileContent, listType);
        return contactModelHashMap;
    }

readFromFile

private String readFromFile(Context context, String jsonFileName) {
            String ret = "";

            try {
                InputStream inputStream = context.openFileInput(jsonFileName);

                if ( inputStream != null ) {
                    InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                    String receiveString = "";
                    StringBuilder stringBuilder = new StringBuilder();

                    while ( (receiveString = bufferedReader.readLine()) != null ) {
                        stringBuilder.append(receiveString);
                    }

                    inputStream.close();
                    ret = stringBuilder.toString();
                }
            }
            catch (FileNotFoundException e) {
                Log.e("login activity", "File not found: " + e.toString());
            } catch (IOException e) {
                Log.e("login activity", "Can not read file: " + e.toString());
            }

            return ret;
    }

UI

1. FragmentContainerView
2. AppBarLayout, Toolbar
3. FrameLayout
4. bottomnavigation.BottomNavigationView

TODO

• Adding filters (By name, by category, by gender).
• Adding the ability to edit a contact.
• Adding the ability to delete a contact.
• Adding the ability to erase the list.
• Adding an image to the contact.

Screenshots

Watch the DEMO on youtube.