1-) Android Yeni -  Fragment kullanımı basit

Fragment kullanımı

Uyarı --> Fragmentleri Framelayout'lara yükle --> Relativelayoutlara yükleme !!!

Uyarı -> Fragmentlerde buttonları onActivityCreated metodunu ovveride yaparak yap

1-) Android Yeni - çağırırken

package com.example.rambo.frangmentogreniyorum;

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

        f1 fragmentbir = new f1(); // fragmentbir'den nesne
        f2 fragmentiki = new f2();// fragmentiki'den nesne

        FragmentManager manager = getSupportFragmentManager();// sabit kod
        FragmentTransaction transaction = manager.beginTransaction();// sabit kod

        transaction.add(R.id.relativ_layout1, fragmentbir, "ilkfragment"); // hangi layouta ekliceksin onu seç ve fragmentini gonder
        transaction.add(R.id.relativ_layout2, fragmentiki, "ikinci"); // hangi layouta ekliceksin onu seç ve fragmentini gonder

        transaction.commit(); // çalıştır
    }
}

2-) fragment.java

package com.example.rambo.frangmentogreniyorum;

import android.content.Context;
import android.net.Uri;
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.Toast;

public class f1 extends Fragment {

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        Button btn= (Button) getActivity().findViewById(R.id.btn_merhaba);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getActivity(), "birinci", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {


        return inflater.inflate(R.layout.fragment_f1, container, false);
    }

}