I have no clue how to solve this.. Lastly, retrieve the saved value in onCreate and set the state of the CheckBox. If t

import android.view.View;
import android.os.Bundle;

public class MainActivity extends Activity {

  private SharedPreferences mSharedPreferences;
  private SharedPreferences.Editor mEditor;

  private static final String PREFS_FILE = "PREFS_FILE";
  private static final String KEY_CHECKBOX = "KEY_CHECKBOX";

  public CheckBox mCheckBox;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mSharedPreferences = getSharedPreferences(PREFS_FILE, Context.MODE_PRIVATE);
    mEditor = mSharedPreferences.edit();
    mCheckBox = (CheckBox) findViewById(R.id.checkBox);
    Boolean mIsChecked = mSharedPreferences.getBoolean(KEY_CHECKBOX, false);
    mCheckBox.setChecked(mIsChecked);
  }


  @Override
  protected void onPause() {
    super.onPause();
    mEditor.putBoolean(KEY_CHECKBOX, mCheckBox.isChecked());
    mEditor.apply();
  }
}