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; @Overrideprotected 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();}