How to add CardView in RecyclerView Dynamically in Android???

Question

I am working on a application where I have to add cardView to recyclerView dynamically , but it is not working.

This is my code :-

Button okBTN;
     EditText enterCornerNumberET;
     private RecyclerView mRecyclerView;
     private CornerListAdapter mAdapter;
 public int cornervalue;


protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.corner_list);


  okBTN = (Button)findViewById(R.id.okBTN);

        enterCornerNumberET = (EditText)findViewById(R.id.enterCornerNumberET);

 mRecyclerView = (RecyclerView)findViewById(R.id.recycler_view);


 mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(mLayoutManager);


 okBTN.setOnClickListener(this);


  @Override
    public void onClick(View v) {

        switch (v.getId()){

 case R.id.okBTN:

                cornervalue = Integer.valueOf(enterCornerNumberET.getText().toString().trim());

                Toast.makeText(CornerListActivity.this, ""+cornervalue, Toast.LENGTH_SHORT).show();

                createCornerList(cornervalue);

               /*if(enterCornerNumberET.getText().toString().trim()==null){


                    Toast.makeText(CornerListActivity.this, "Please enter corner number", Toast.LENGTH_SHORT).show();

                }else{

                    createCornerList(cornervalue);

                }*/


                break;

}
}

 private void createCornerList(int cornervalue) {


        for (int i = 0; i < cornervalue; i++) {

            mAdapter=new CornerListAdapter(this,roofCornerArrayList);
            mRecyclerView.setAdapter(mAdapter);
        }
    }

Please have a look and let me know what mistake I am doing here. Thanks in advance. :)

Answer 1

Here in my code I have set CardView in RecyclerView and For Layout in RecyclerView, I have use StaggeredGridLayoutManager.

dataModel.java (Model Class)

private String first;

public String getFirst() {
    return first;
}
 public void setFirst(String first) {
    this.first = first;
}
  public dataModel()
  {}

MainActivity.java

public class MainActivity extends AppCompatActivity {

RecyclerView recyclerView;
List<dataModel> list;
AdapterViewHolder adapterViewHolder;
dataModel[] dataModels;
String[] first = {"QUICK CAULIFLOWER TABBOULESH",
        "GRILLED CORN WITH MISO BUTTER"};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_activity);
    recyclerView = (RecyclerView) findViewById(R.id.recylcerView);
    int length=first.length;
    dataModels = new dataModel[length];
    list = new ArrayList<>();
    for (int i = 0; i < length; i++) {
        dataModels[i] = new dataModel();
        dataModels[i].setFirst(first[i]);
        dataModels[i].setDescription(second[i]);
        dataModels[i].setImage(image[i]);
        list.add(dataModels[i]);
    }
    adapterViewHolder = new AdapterViewHolder(list, MainActivity.this);
    recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));
    recyclerView.setAdapter(adapterViewHolder);
}
}

AdapterViewHolder.java

public class AdapterViewHolder extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private List<dataModel> list;
private Context context;

public AdapterViewHolder(List<dataModel> list, Context context) {
    this.list = list;
    this.context = context;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout, parent, false); //inflate layout in view
    return new ViewHolder(view);  //return holder
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    ((ViewHolder) holder).textViewFirst.setText(list.get(position).getFirst());
}

@Override
public int getItemCount() {
    return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
    TextView textViewFirst;

    public ViewHolder(View itemView) {
        super(itemView);
        textViewFirst=(TextView)itemView.findViewById(R.id.textViewFirst);
    }
}
}

Here In my code, I have set array of String variable in CardView and after CardView is set in RecyclerView. For set CardView in RecyclerView I have use one AdapterViewHolder. AdapterViewHolder Class extends RecyclerView.Adapter and layout.xml contains cardView with one textView in it. In AdapterViewHolder,In onCreateViewHolder(), I have inflate layout.xml file and in onBindViewHolder() method bind values of dataModel class in textView. At last, In MainActivity.java I have set AdapterViewHolder in RecyclerView.

Answer 2

You can check here for how to use RecyclerView. After any change in data, you can call Adapter's notifyDataSetChanged() to refresh the view.