RecyclerView Library with LoadMore

Super Simple RecyclerView with Infinite Scrolling LoadMore, ClickListener Features, Server Requests, and many more.

Add this line in app level build.gradle inside dependencies section in Android Studio.

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

Steps

Create a layout file for RecyclerView

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

Create a View Holder that extends MyViewHolder providing a class type to bind together with

public static class VHolder extends MyViewHolder<Events> {
    TextView date, title, summary;
    public VHolder(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);
    }
}

Initialize Adapter by providing the data items, the holder it supports and the layout design

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

After the data is loaded, RecyclerView could be notified by

recycler.loadComplete();

When LoadMore is not required, loading can be set to hidden by calling

recycler.hideLoadMore();

That's it.

---

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) {
            if (identifier.equals("0")) {
                items.clear();
            }
            List<Events> data = Events.parseJSON(result);
            if (data.size() > 0) {
                items.addAll(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.**