How creat recyclerview adapter?

How do I display my list from ActivityMain to Realm? How to add with EditText on Main2Activity a new player in Realm?

P.S.
Need to create a class App extends Application?
i spent 4 days end no result

class MainActivity: Here I want add List players in Realm
, it's default.

package com.first.anew;

import android.content.Intent;
import android.graphics.Canvas;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.Menu;
import android.view.MenuItem;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import io.realm.Realm;
import pl.fanfatal.swipecontrollerdemo.R;

public class MainActivity extends AppCompatActivity {


private PlayersDataAdapter mAdapter;
SwipeController swipeController = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

setPlayersDataAdapter();
setupRecyclerView();



}


private void setPlayersDataAdapter() {

List<Player> players = new ArrayList<>();



Intent i = getIntent();
String text = i.getStringExtra ( "TextBox" );
if (text != null) {
Player pl = new Player();
pl.setName(text);
players.add(players.size(), pl);
}


try {
InputStreamReader is = new InputStreamReader(getAssets().open("players.csv"));

BufferedReader reader = new BufferedReader(is);
reader.readLine();
String line;
String st;



while ((line = reader.readLine()) != null) {

st = line.split(",");
Player player = new Player();
player.setName(st[0]);

players.add(player);


}



} catch (IOException e) {


}

mAdapter = new PlayersDataAdapter(players);

}


private void setupRecyclerView() {
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
recyclerView.setAdapter(mAdapter);

swipeController = new SwipeController(new SwipeControllerActions() {
@Override
public void onRightClicked(int position) {
// mAdapter.players.remove(position);
mAdapter.notifyItemRemoved(position);
mAdapter.notifyItemRangeChanged(position, mAdapter.getItemCount());
}
});

ItemTouchHelper itemTouchhelper = new ItemTouchHelper(swipeController);
itemTouchhelper.attachToRecyclerView(recyclerView);

recyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
swipeController.onDraw(c);
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_cat1) {
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
}


class Main2Activity: Here with the EditText i add new player in Realm (List players)

package com.first.anew;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import io.realm.Realm;
import pl.fanfatal.swipecontrollerdemo.R;

public class Main2Activity extends AppCompatActivity {


private EditText editText;
private Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
addListenerOnButton();

}

public void addListenerOnButton() {
editText = (EditText) findViewById(R.id.edit_text);
button = (Button) findViewById(R.id.b1);
button.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent ( Main2Activity.this, MainActivity.class );
intent.putExtra ( "TextBox", editText.getText().toString() );
startActivity(intent);
}
}


);
}


}


class Player

package com.first.anew;

import io.realm.RealmObject;

public class Player extends RealmObject {

private String name;


public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}


}


class PlayersDataAdapter: Adapter without Realm

package com.first.anew;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

import pl.fanfatal.swipecontrollerdemo.R;


class PlayersDataAdapter extends RecyclerView.Adapter<PlayersDataAdapter.PlayerViewHolder> {
public List<Player> players;

public class PlayerViewHolder extends RecyclerView.ViewHolder {
private TextView name;

public PlayerViewHolder(View view) {
super(view);
name = (TextView) view.findViewById(R.id.name);

}
}

public PlayersDataAdapter(List<Player> players) {
this.players = players;
}

@Override
public PlayerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row_view, parent, false);

return new PlayerViewHolder(itemView);
}

@Override
public void onBindViewHolder(PlayerViewHolder holder, int position) {
Player player = players.get(position);
holder.name.setText(player.getName());

}

@Override
public int getItemCount() {
return players.size();
}
}


It is quite unclear what exactly are you asking here. Could you please EDIT your question and rephrase it? (Please avoid posting comments on your own question) Thanks
– sɐunıɔןɐqɐp
Jun 29 at 10:45

The official samples show you how to do this
– EpicPandaForce
Jun 29 at 10:46

@EpicPandaForce so i try to explain my Q .the question is how to add a list from MainActivity to Realm ? and How i can add by EditText from Main2Activity a new player in Realm data base? i suppose that i should use adapter but didn't know how it to realize it.
– Иван Грищенко
Jun 29 at 13:09

You seem to be reading from a CSV to fill up your data. Realm's official samples also show you how to do this.
– EpicPandaForce
Jun 29 at 13:19

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