Question

我有这段代码存储＆＃34;切换＆＃34;列表视图中的特定项目。我使用项目的名称作为密钥。但是，getBoolean的结果始终返回第二个参数中指定的默认值。我无法弄清楚我是否错误地实现了它，或者我忽视了一些事情为了澄清，summonerNames是Strings的一个arraylist。

        MenuItem toggle = menu.findItem(R.id.postGameNotif);
        SharedPreferences prefs = getApplicationContext().getSharedPreferences("summoner_prefs", MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        Log.i(TAG, summonerNames.get(position));
        boolean postNotif = prefs.getBoolean(summonerNames.get(position),false);
        if (postNotif == true) {
            toggle.setTitle("Disable post-game notifications");
            Log.i(TAG,"Disabled");
            editor.putBoolean(summonerNames.get(position), false);
        }
        else {
            toggle.setTitle("Enable post-game notifications");
            Log.i(TAG, "Enabled");
            editor.putBoolean(summonerNames.get(position), true);
            Log.i(TAG, String.valueOf(prefs.getBoolean(summonerNames.get(position),false)));
        }

Answer 1

问题是未在共享首选项中提交添加值。

在添加布尔值后，您错过了在共享偏好中提交更改

检查this链接

 MenuItem toggle = menu.findItem(R.id.postGameNotif);
        SharedPreferences prefs = getApplicationContext().getSharedPreferences("summoner_prefs", MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        Log.i(TAG, summonerNames.get(position));
        boolean postNotif = prefs.getBoolean(summonerNames.get(position),false);
        if (postNotif == true) {
            toggle.setTitle("Disable post-game notifications");
            Log.i(TAG,"Disabled");
            editor.putBoolean(summonerNames.get(position), false);
editor.commit()// you need to commit after adding it to sharedpref
        }
        else {
            toggle.setTitle("Enable post-game notifications");
            Log.i(TAG, "Enabled");
            editor.putBoolean(summonerNames.get(position), true);
editor.commit()// you need to commit after adding it to sharedpref
            Log.i(TAG, String.valueOf(prefs.getBoolean(summonerNames.get(position),false)));
        }

访问共享首选项无法正常工作

1 个答案: