Question

我正在尝试共享首选项，但我无法让我的更改永久保存。

SharedPreferences prefs;
SharedPreferences.Editor prefsEditor;
String lastPlayerPref = "LAST_PLAYER";

public void onCreate(Bundle savedInstanceState) {
    prefs = this.getSharedPreferences("myPrefs", MODE_PRIVATE);
    prefsEditor = prefs.edit();
    String lastPlayer = prefs.getString(lastPlayerPref, "test");
    System.err.println(lastPlayer);  //always outputs "test" no matter what I do

    prefsEditor.putString(lastPlayerPref, "me");
    prefsEditor.commit();

    ...
}

当我最初运行时，我希望输出“test”。当我在那之后运行它时，我希望它输出“我”。但它总是输出“测试”。在没有保存首选项的情况下，该参数不是默认值吗？

很抱歉这个混乱。谢谢！

Answer 1

我想你忘记添加 .putString（lastPlayerPref，“player1”）;

prefs = ProgressBarActivity.this.getSharedPreferences("myPrefs", MODE_PRIVATE);
prefsEditor = prefs.edit().putString(lastPlayerPref, "player1");
prefsEditor.commit();

String lastPlayer = prefs.getString(lastPlayerPref, "test");
System.err.println(lastPlayer);

prefsEditor = prefs.edit().putString(lastPlayerPref, "player2");
prefsEditor.commit();

lastPlayer = prefs.getString(lastPlayerPref, "test");
System.err.println(lastPlayer);

如果你在上面尝试，你会看到它会改变

Android共享首选项无法保存

1 个答案: