Kalıcı olarak arkaplan değiştirme ...

Selam zeynep ;

Aşağıdaki kodu incelersen bi bilgi verebilir.

import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {
    RelativeLayout relativeLayout;
    Button button;
    public static final String renk = "renk";
    SharedPreferences sharedpreferences;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button=(Button) findViewById(R.id.button);
        relativeLayout=(RelativeLayout) findViewById(R.id.relative);
        sharedpreferences = getSharedPreferences(renk, Context.MODE_PRIVATE);

        if(sharedpreferences!=null) {
            relativeLayout.setBackgroundColor(sharedpreferences.getInt(renk, Color.GREEN));
        }
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                SharedPreferences.Editor editor = sharedpreferences.edit();
                int color=Color.RED;
                editor.putInt(renk,color);
                editor.commit();

                relativeLayout.setBackgroundColor(color);
            }
        });
    }
}