Google Android - это несложно

Код: Выделить всё

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {
    Button button2;
    Button button;
    @Override

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

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button2 = (Button) findViewById(R.id.button2);
        button= (Button) findViewById(R.id.button);




        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setContentView(R.layout.activity_main);
            }
        });




        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               setContentView(R.layout.setting);
            }
        });






    }
}