Setting background color on the captureactivity

CaptureActivity.java

package za.co.gundula.app.androidcolorpicker;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;

public class CaptureActivity extends AppCompatActivity {

    Context context;

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

        context = getApplicationContext();

        TextView text = (TextView) findViewById(R.id.text);

        View root = text.getRootView();

        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
        int backgroundColor = sp.getInt("capture_background_color", -1);

        if (backgroundColor != -1) {
            root.setBackgroundColor(backgroundColor);
        }

    }
}