Super Easy RecyclerView Library for Simple and MultiView Layout

An awesome library for the Android to make Simple RecyclerView and Multi Layout Recyclerview

Add the following line in dependencies part of build.gradle in app directory.

implementation 'com.hereshem.lib:awesomelib:2.1.2'

If you want to contribute on the library, please send the pull request to [this] (https://github.com/hereshem/RecyclerViewWithLoadMoreAndServerRequest) repository.

Simple RecyclerView Implementation

Add RecyclerView in the layout file using the following

<com.hereshem.lib.recycler.MyRecyclerView
        android:id="@+id/recycler"
        app:layoutManager="LinearLayoutManager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

Create View Holders with very easy code. Provide the type of class that support the holder to display with. That class will be binded to display the content.

public static class EVHolder extends MyViewHolder<Events> {
    TextView date, title, summary;
    public EVHolder(View v) {
        super(v);
        date = v.findViewById(R.id.date);
        title = v.findViewById(R.id.title);
        summary = v.findViewById(R.id.summary);
    }
    @Override
    public void bindView(Events c) {
        date.setText(c.date);
        title.setText(c.title);
        summary.setText(c.summary);
    }
}

Create Items List variable and adapters with very few lines

List<Events> items = new ArrayList<>();
MyRecyclerView recycler = findViewById(R.id.recycler);
RecyclerViewAdapter adapter = new RecyclerViewAdapter(this, items, EVHolder.class, R.layout.row_event);
recycler.setAdapter(adapter);

Add ClickListener and LoadMore

recycler.setOnItemClickListener(new MyRecyclerView.OnItemClickListener() {
    @Override
    public void onItemClick(int position) {
        Toast.makeText(MainActivity.this, "Recycler Item Clicked " + position, Toast.LENGTH_SHORT).show();
    }
});

recycler.setOnLoadMoreListener(new MyRecyclerView.OnLoadMoreListener() {
    @Override
    public void onLoadMore() {
        loadData();
    }
});
loadData();

That's it.

---

Multi Layout RecyclerView

Create More View Holders

public static class TVHolder extends MyViewHolder<String> {
    TextView title;
    public TVHolder(View v) {
        super(v);
        title = v.findViewById(R.id.title);
    }
    @Override
    public void bindView(String c) {
        title.setText(c);
    }
}

public static class DVHolder extends MyViewHolder<Integer> {
    TextView title;
    public DVHolder(View v) {
        super(v);
    }
    @Override
    public void bindView(Integer c) {
    }
}

Define Multiview with MultiLayoutHolder where the multiple layout is binded to play with the class initialized for the specific ViewHolder with specific layout.

MultiLayoutHolder holders = new MultiLayoutHolder()
                .add(Events.class, EVHolder.class, R.layout.row_event)
                .add(String.class, TVHolder.class, R.layout.row_simple)
                .add(Integer.class, DVHolder.class, R.layout.row_divider);

Now Initialize Adapter with very simple code

List<Object> items = new ArrayList<>();
MultiLayoutAdapter adapter = new MultiLayoutAdapter(this, items, holders);
recycler.setAdapter(adapter);

The MultiLayout is automatically selected with the type of data added to the items.

items.add(new Events(...)); binds the EVHolder and Events item is displayed into the RecyclerView.

items.add("Hem Shrestha"); binds the TVHolder and String item is displayed.

items.add(26); binds and displays the divider layout.

---

Bonus

Online Data request to server made more simpler using the following code.

private void loadData() {
    new MyDataQuery(this) {
        @Override
        public void onSuccess(String identifier, String result) {
            List<Events> data = Events.parseJSON(result);
            if (table_name.equals("0")) {
                items.clear();
            }
            if (data.size() > 0) {
                String last="";
                for (int i = 0; i < data.size(); i++) {
                    if (!last.equals(data.get(i).date.substring(5,7))) {
                        last = data.get(i).date.substring(5,7);
                        items.add("For month of " + last); 		// adding String data for text leveling
                    }
                    else{
	                    items.add(i); 							// adding Integer data for Divider
                    }
                    items.add(data.get(i)); 					// adding Event data
                }
                recycler.loadComplete();
                start += data.size();
            } else {
                recycler.hideLoadMore();
            }
        }
    }
    .setUrl("http://dl.mantraideas.com/apis/events.json")
    .setMethod(Method.GET)
    .setIdentifier(start+"")
    .execute();
}

Further more - Offline support can also be provided.

new MyDataQuery(this) {
	...
	...
    @Override
    public String onDataQuery(String identifier) {
        if(identifier.equals("0")){
            return new Preferences(getApplicationContext()).getPreferences("data_downloaded");
        }
        return super.onDataQuery(identifier);
    }

    @Override
    public void onDataSave(String identifier, String response) {
        if(identifier.equals("0")){
            new Preferences(getApplicationContext()).setPreferences("data_downloaded", response);
        }
    }
    ...
    ...
}...

In case of using Proguard, use these lines

-keep class com.hereshem.lib.** {*;}
-dontwarn com.hereshem.lib.**

Happy Coding :)