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Question

我試圖讓您可以保存高分，並且我還需要用戶能夠重置/刪除他們的高分。 TOAST工作，但數據不會被刪除。

public static final String PREFS_NAME = "MyPrefsFile"; 
    static SharedPreferences settings; 
    static SharedPreferences.Editor editor; 

    // When 'back' button is pressed save the highscore to settings  
    editor = settings.edit();// Create a new editor 
    editor.putInt("highscore", HighScore); // Storing integer 
    editor.commit(); 


    // When 'Show' button is pressed 
    public void showPreferences(View v) { 
     int highscore = GameActivity.settings.getInt("highscore", GameActivity.HighScore); 
     Toast.makeText(MainMenu.this, "Your Highscore is: " + highscore, Toast.LENGTH_LONG).show(); 
    } 

    //When delete button is pressed 
    public void clearPreferences(View V) { 
     GameActivity.editor = GameActivity.settings.edit();// Create a new editor 
     GameActivity.editor.clear(); 
     GameActivity.editor.commit(); 
     Toast.makeText(MainMenu.this,"Highscore has been reset",Toast.LENGTH_LONG).show(); 
    } 

Answer 1

我相信你只是讀錯了，用這個

int highscore = GameActivity.settings.getInt("highscore", 0); 

注意，第二個參數是默認值，即返回如果該鍵的值是不存在的值設置。

Answer 2

你可以試試這個：

settings = getSharedPreferences("MyPrefsFile", 0); 
preferences.edit().remove("highscore").commit(); 

或者你也可以用0值

Answer 3

更新sharepreference使用下面清除共享偏好

settings.edit().clear().commit(); 

或者使用下面從偏好中清除單個值

settings.edit().remove("highscore").commit();