InterFragment Communication

FragmentFirst.java

package example.fragmentcommu;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;


public class FragmentOne extends Fragment {
    SendMessage sm;
    Button btn;
    EditText et;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rotview = inflater.inflate(R.layout.fragmentone,container,false);
        btn = (Button)  rotview.findViewById(R.id.button);
        et =  (EditText) rotview.findViewById(R.id.msg);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String Message;
                Message = et.getText().toString();
                sm.sendData(Message);
            }
        });
        return rotview;
    }

    interface  SendMessage
    {
        public void sendData (String message);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            sm = (SendMessage) activity;
        }
        catch (ClassCastException e)
        {
            throw new ClassCastException("You need to implement sendData Method");
        }
    }
}

FragmentTwo.java

package example.fragmentcommu;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class FragmentTwo extends Fragment {
    TextView txt;
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rotview = inflater.inflate(R.layout.fragmenttwo,container,false);
        txt = (TextView)rotview.findViewById(R.id.txt);
        return rotview;
    }

    public void getData (String message) {
        txt.setText(message);
    }
}

MainActivity.java

package example.fragmentcommu;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends ActionBarActivity implements FragmentOne.SendMessage {

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void sendData(String message) {

        FragmentTwo f2 =  (FragmentTwo)getSupportFragmentManager().findFragmentById(R.id.fragment2);
        f2.getData(message);
    }
}