访问共享首选项无法正常工作

Question

我有一段代码可以为列表视图中的特定项目存储 "toggle"。我使用项目的名称作为键。但是，getBoolean 的结果总是returns 第二个参数中指定的默认值。我真的搞不清楚是我实施错了，还是我忽略了什么
为澄清起见，summonerNames 是一个字符串数组列表。

        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

问题是添加的值未在共享首选项中提交。

添加布尔值后，您错过了在 sharedpreference 中提交更改

勾选thislink

 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

Accessing shared preferences not working correctly

android

sharedpreferences

android-contextmenu