RecyclerView Adding elements dynamically
Output:
Files need to bee in New Project:
MainActivity
RAdapter
RModel
activity_main.xml
inflator_layout.xml
build-gradle(app)
implementation 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'
public class MainActivity extends AppCompatActivity {
@BindView(R.id.my_recycler_view)
RecyclerView mRecyclerView;
private List<RModel> mList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
mList = new ArrayList<>();
create100Rows();
RAdapter rAdapter = new RAdapter(this, mList, new RAdapter.OnItemClickListener() {
@Override
public void onItemClick(int position) {
//nothing todoo here when click on button
}
});
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.setAdapter(rAdapter);
}
/**
* When click on 'Add button' this method will be called.
* @param view Particular View
*/
public void addOneRow(View view) {
addRow();
refreshRV();
}
/**
* Adding row to existing list at end.
*/
private void addRow() {
String name = String.valueOf(getSizeOfList());
RModel rModel = new RModel();
rModel.setName(name);
mList.add(rModel);
}
/**
* Creating 100 rows dynamically
*/
private void create100Rows() {
for (int i = 0; i < 500; i++) {
RModel rModel = new RModel();
rModel.setName("Row no " + i);
mList.add(rModel);
}
}
/**
* Refreshing RecyclerView and scroll up dynamically
*/
private void refreshRV() {
mRecyclerView.getAdapter().notifyItemInserted(getSizeOfList());
mRecyclerView.smoothScrollToPosition(getSizeOfList());
}
/**
* Get total size of list
* @return Total size of list
*/
private int getSizeOfList() {
return mList.size();
}
}
public class RAdapter extends
RecyclerView.Adapter<RAdapter.ViewHolder> {
private static final String TAG = RAdapter.class.getSimpleName();
private Context context;
private List<RModel> list;
private OnItemClickListener onItemClickListener;
public RAdapter(Context context, List<RModel> list,
OnItemClickListener onItemClickListener) {
this.context = context;
this.list = list;
this.onItemClickListener = onItemClickListener;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
// Todo Butterknife bindings
@BindView(R.id.text)
TextView mTV;
public ViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
public void bind(final RModel model,
final OnItemClickListener listener) {
if(model.getName() != null) mTV.setText(model.getName());
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onItemClick(getLayoutPosition());
}
});
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.inflator_layout, parent, false);
ButterKnife.bind(this, view);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
RModel item = list.get(position);
//Todo: Setup viewholder for item
holder.bind(item, onItemClickListener);
}
@Override
public int getItemCount() {
return list.size();
}
public interface OnItemClickListener {
void onItemClick(int position);
}
}
public class RModel {
String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.widget.RecyclerView
android:id="@+id/my_recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="8"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="add one row"
android:onClick="addOneRow"/>
</LinearLayout>
inflator_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>