Sharedreferences 与 switch 按钮不保存

Question

OneSignal.setSubscription (true or false) 在这个按钮的帮助下，我使用 SharedPreferences 方法向应用程序添加了一个 Switch 按钮；，但问题是即使我使用 SharedPreferences 不保存 Button 的值，当我们重新启动应用程序时也不保存默认值。

package com.package.name;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.widget.CompoundButton;

import android.widget.Switch;

import android.widget.Toast;

import com.onesignal.OneSignal;

public class ButtonOneSignal extends AppCompatActivity {

    Switch btn; 

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_one_signal); //Layout tanımladım

    //switch viettel

    btn = (Switch) findViewById(R.id.switch2);

    btn.setChecked(getFromSP("sw1"));

    btn.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override

        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            if (isChecked == true) {

                OneSignal.setSubscription(true);

                Toast.makeText(getApplicationContext(),"Active",Toast.LENGTH_LONG).show();

            } else

                OneSignal.setSubscription(false);

                Toast.makeText(getApplicationContext(),"DeActive",Toast.LENGTH_LONG).show();

        }

    });

}

private boolean getFromSP(String key) {

    SharedPreferences preferences = getApplicationContext().getSharedPreferences("com.package.name", android.content.Context.MODE_PRIVATE);

    return preferences.getBoolean(key, false);

}

private void saveInSp(String key, boolean value) {

    SharedPreferences preferences = getApplicationContext().getSharedPreferences("com.package.name", android.content.Context.MODE_PRIVATE);

    SharedPreferences.Editor editor = preferences.edit();

    editor.putBoolean(key, value);

    editor.commit();

}