java - 我的切换中的 SharedPreferences 问题

Question

我在切换按钮中使用共享首选项时遇到问题。首先，我声明我需要什么:

public SharedPreferences preferences;
public WifiManager wifiManager;
ToggleButton wifitoggle;

然后是“action”onClickc

// toggle wifi
    public void wifi (View view) {
        wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
        boolean wifion = ((ToggleButton) view).isChecked();
        if (wifion) {
            wifiManager.setWifiEnabled(true);
            // Shared preferences
            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("togglewifi", true); // value to store
            editor.commit();

        }else{
            wifiManager.setWifiEnabled(false);
            // Shared preferences
            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("togglewifi", false); // value to store
            editor.commit();

        }
    }

在我的 onCreate 中我报告了该值:

boolean togglewifi = preferences.getBoolean("togglewifi", false);  //default è false
        if (togglewifi) 
        {

            wifitoggle.setChecked(true);
        }
            else
        {
            wifitoggle.setChecked(false);
        }

但是当我运行应用程序时它崩溃了。奇怪的是 logCat 没有说什么。没有错误..我错过了什么吗？感谢您的帮助

Answer 1

试试这个:

SharedPreferences sPref = getSharedPreferences(PREFS_NAME, 0);
Editor editor = sPref.edit();
editor.putBoolean("KEY", true/false);
editor.apply();