android - SharedPreferences 不保存值(value)

Question

我有这个代码:

public class Register extends Activity {

    private LinearLayout layout;
    private TextView debug;
    public static final String USER_CONFIG = "UserConfigs";

    @Override
    public void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);

        SharedPreferences settings = getSharedPreferences(USER_CONFIG, MODE_PRIVATE);
        boolean registered = settings.getBoolean("registered", false);

        layout = (LinearLayout) findViewById(R.id.layoutRegister);

        if (!registered) {
            debug = new TextView(this);
            debug.setText("You have to register");
            layout.addView (debug);

            //TO DO user registration

            settings.edit().putBoolean("registered", true);
            settings.edit().commit(); 
        } else {
            debug = new TextView(this);
            debug.setText("You have already registered");
            layout.addView (debug);
            //TO DO skip to next screen
        }
    }
}

但是当我重新启动我的应用程序时，我总是被注册为“false”。我也尝试在 onStop() 上提交它并得到相同的结果。我在这里看到了其他有这个问题的主题，但没有一个和我有同样的问题。

有什么想法吗？

Answer 1

你不能这样做:

settings.edit().putBoolean("registered", true);
settings.edit().commit(); 

您需要获取编辑器对象，然后进行更改:

Editor editor = settings.edit();
editor.putBoolean(...);
editor.commit();